diff --git a/porting/liteos_a/kernel/include/assert.h b/porting/liteos_a/kernel/include/assert.h
index 3ea050713817b798491331883f0eadbe14cc16b4..0381fb35f42b3eb0e649f0dfb3c62d32ffa116be 100644
--- a/porting/liteos_a/kernel/include/assert.h
+++ b/porting/liteos_a/kernel/include/assert.h
@@ -8,23 +8,16 @@
 #define assert(x) ((void)((x) || (__assert_fail(#x, __FILE__, __LINE__, __func__),0)))
 #endif
 
-#ifdef CONFIG_DEBUG
-#define DEBUGASSERT(f) \
-       { if (!(f)) up_assert((const uint8_t *)__FILE__, (int)__LINE__); }
-#else
-#define DEBUGASSERT(f)
-#endif
+#define DEBUGASSERT(x) assert(x)
 
 #if __STDC_VERSION__ >= 201112L && !defined(__cplusplus)
-#undef static_assert
 #define static_assert _Static_assert
 #endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif
-_Noreturn void __assert(const char *, int, const char *);
-_Noreturn void __assert2(const char *, int, const char *, const char *);
+
 _Noreturn void __assert_fail (const char *, const char *, int, const char *);
 
 #ifdef __cplusplus
diff --git a/porting/liteos_a/kernel/include/bits/alltypes.h b/porting/liteos_a/kernel/include/bits/alltypes.h
index 9a1b92a21fdec024c37b3d1cd18a81b2409b8a87..4ebf5ac88736bca23676e834f8eb8a1409b48752 100644
--- a/porting/liteos_a/kernel/include/bits/alltypes.h
+++ b/porting/liteos_a/kernel/include/bits/alltypes.h
@@ -347,32 +347,7 @@ typedef struct __locale_struct *locale_t;
 #endif
 
 #if defined(__NEED_struct__IO_FILE) && !defined(__DEFINED_struct__IO_FILE)
-struct _IO_FILE {
-  unsigned flags;
-  unsigned char *rpos, *rend;
-  int (*close)(struct _IO_FILE *);
-  unsigned char *wend, *wpos;
-  unsigned char *mustbezero_1;
-  unsigned char *wbase;
-  size_t (*read)(struct _IO_FILE *, unsigned char *, size_t);
-  size_t (*write)(struct _IO_FILE *, const unsigned char *, size_t);
-  off_t (*seek)(struct _IO_FILE *, off_t, int);
-  unsigned char *buf;
-  size_t buf_size;
-  struct _IO_FILE *prev, *next;
-  int fd;
-  int pipe_pid;
-  int mode;
-  void *lock;
-  int lbf;
-  void *cookie;
-  off_t off;
-  char *getln_buf;
-  void *mustbezero_2;
-  unsigned char *shend;
-  off_t shlim, shcnt;
-  struct __locale_struct *locale;
-};
+struct _IO_FILE { char __x; };
 #define __DEFINED_struct__IO_FILE
 #endif
 
diff --git a/porting/liteos_a/kernel/include/bits/errno.h b/porting/liteos_a/kernel/include/bits/errno.h
index 0852a0458a92783a898bc3844ec9163c98ed9a9e..4b1b0954f21e097411d406fbd55d7eb2d67c6d89 100644
--- a/porting/liteos_a/kernel/include/bits/errno.h
+++ b/porting/liteos_a/kernel/include/bits/errno.h
@@ -133,5 +133,3 @@
 #define ENOTRECOVERABLE 131
 #define ERFKILL         132
 #define EHWPOISON       133
-
-#define ENOSUPP         201
diff --git a/porting/liteos_a/kernel/include/bits/stat.h b/porting/liteos_a/kernel/include/bits/stat.h
index 8dd6ec73cf76b4f8c1defdde50b496da7abb1bbe..2c55b0a31b19c49f2dc22317c5da375ef9c548aa 100644
--- a/porting/liteos_a/kernel/include/bits/stat.h
+++ b/porting/liteos_a/kernel/include/bits/stat.h
@@ -24,6 +24,12 @@ struct stat {
 	struct timespec st_ctim;
 };
 
+#define __NEED_uint16_t
+#define __NEED_uint32_t
+#define __NEED_uint64_t
+#define __NEED_int32_t
+#define __NEED_int64_t
+#include <bits/alltypes.h>
 struct statx {
 	uint32_t stx_mask;
 	uint32_t stx_blksize;
diff --git a/porting/liteos_a/kernel/include/byteswap.h b/porting/liteos_a/kernel/include/byteswap.h
index 293b1020ee9a1f1b5dde07ceaa7b19c5f07f09e4..00b9df3c9fa2b1511105ef60efca7650607a9f52 100644
--- a/porting/liteos_a/kernel/include/byteswap.h
+++ b/porting/liteos_a/kernel/include/byteswap.h
@@ -11,12 +11,12 @@ static __inline uint16_t __bswap_16(uint16_t __x)
 
 static __inline uint32_t __bswap_32(uint32_t __x)
 {
-	return (__x>>24) | (__x>>8&0xff00) | (__x<<8&0xff0000) | (__x<<24);
+	return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
 }
 
 static __inline uint64_t __bswap_64(uint64_t __x)
 {
-	return (__bswap_32(__x)+0ULL)<<32 | __bswap_32(__x>>32);
+	return __bswap_32(__x)+0ULL<<32 | __bswap_32(__x>>32);
 }
 
 #define bswap_16(x) __bswap_16(x)
diff --git a/porting/liteos_a/kernel/include/endian.h b/porting/liteos_a/kernel/include/endian.h
index ba7b7d3f4c66f94cefe1b7cac2cbd0572899505e..9b794ac91a1e51e7b632fa51f7bb8179df8f22eb 100644
--- a/porting/liteos_a/kernel/include/endian.h
+++ b/porting/liteos_a/kernel/include/endian.h
@@ -27,12 +27,12 @@ static __inline uint16_t __bswap16(uint16_t __x)
 
 static __inline uint32_t __bswap32(uint32_t __x)
 {
-	return (__x>>24) | ((__x>>8)&(0xff00)) | ((__x<<8)&(0xff0000)) | ((__x<<24));
+	return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
 }
 
 static __inline uint64_t __bswap64(uint64_t __x)
 {
-	return (__bswap32(__x)+0ULL)<<32 | __bswap32(__x>>32);
+	return __bswap32(__x)+0ULL<<32 | __bswap32(__x>>32);
 }
 
 #if __BYTE_ORDER == __LITTLE_ENDIAN
diff --git a/porting/liteos_a/kernel/include/errno.h b/porting/liteos_a/kernel/include/errno.h
index 7213ec95f2970d300d83546cb125c1be6cd069a3..2443577c8b3906c6bfafd8306d9f38ee65521bc0 100644
--- a/porting/liteos_a/kernel/include/errno.h
+++ b/porting/liteos_a/kernel/include/errno.h
@@ -9,15 +9,14 @@ extern "C" {
 
 #include <bits/errno.h>
 
-void set_errno(int err_code);
-int get_errno(void);
-int *__errno_location(void);
-
 #ifdef __GNUC__
 __attribute__((const))
 #endif
-extern volatile int* __errno(void);
-#define errno (*__errno())
+int *__errno_location(void);
+#define errno (*__errno_location())
+
+#define set_errno(err) do { if (err) { errno = (err); } } while(0)
+#define get_errno() errno
 
 #ifdef _GNU_SOURCE
 extern char *program_invocation_short_name, *program_invocation_name;
diff --git a/porting/liteos_a/kernel/include/features.h b/porting/liteos_a/kernel/include/features.h
index 53e509644fd82bb80a6938b6363d97e43fe0f9ce..cf25d72b920851df9a1c4f60e503de8e2da94178 100644
--- a/porting/liteos_a/kernel/include/features.h
+++ b/porting/liteos_a/kernel/include/features.h
@@ -1,8 +1,6 @@
 #ifndef _FEATURES_H
 #define _FEATURES_H
 
-#define _DEFAULT_SOURCE
-#define _LARGEFILE64_SOURCE
 #define _GNU_SOURCE
 
 #if defined(_ALL_SOURCE) && !defined(_GNU_SOURCE)
@@ -41,6 +39,4 @@
 
 #define __REDIR(x,y) __typeof__(x) x __asm__(#y)
 
-#include "../src/include/features.h"
-
-#endif
\ No newline at end of file
+#endif
diff --git a/porting/liteos_a/kernel/include/langinfo.h b/porting/liteos_a/kernel/include/langinfo.h
index 2332864dea00746d0fdf372f32ea969baf0df3bd..519c061294c0f96fa3bffa40ec9ec3f1da8bd02c 100644
--- a/porting/liteos_a/kernel/include/langinfo.h
+++ b/porting/liteos_a/kernel/include/langinfo.h
@@ -91,8 +91,6 @@ extern "C" {
 char *nl_langinfo(nl_item);
 char *nl_langinfo_l(nl_item, locale_t);
 
-#include "../src/include/langinfo.h"
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/porting/liteos_a/kernel/include/net/ethernet.h b/porting/liteos_a/kernel/include/net/ethernet.h
index 5805ae3d086555c5913c220e067b26f444269b5b..c8d4177fd278b2829a198c915919ac5f184f670d 100644
--- a/porting/liteos_a/kernel/include/net/ethernet.h
+++ b/porting/liteos_a/kernel/include/net/ethernet.h
@@ -32,7 +32,7 @@ struct ether_header {
 #define ETHERTYPE_LOOPBACK	0x9000
 
 
-#define	ETHER_ADDR_LEN	6
+#define	ETHER_ADDR_LEN	ETH_ALEN
 #define	ETHER_TYPE_LEN	2
 #define	ETHER_CRC_LEN	4
 #define	ETHER_HDR_LEN	ETH_HLEN
diff --git a/porting/liteos_a/kernel/include/netinet/in.h b/porting/liteos_a/kernel/include/netinet/in.h
index 225ca288cc4dcba9e916b5856b9d0f069ef754af..5b8b21e6416e2c0beae34678e19617e3c3336209 100644
--- a/porting/liteos_a/kernel/include/netinet/in.h
+++ b/porting/liteos_a/kernel/include/netinet/in.h
@@ -311,7 +311,6 @@ struct ip6_mtuinfo {
 	struct sockaddr_in6 ip6m_addr;
 	uint32_t ip6m_mtu;
 };
-
 #endif
 
 #define IPV6_ADDRFORM           1
diff --git a/porting/liteos_a/kernel/include/netinet/ip_icmp.h b/porting/liteos_a/kernel/include/netinet/ip_icmp.h
index 804293d3f18356f04f8349e458dfb967e03541c2..b9e0df8997e145726e1c0eef5768c52c5c69fb97 100644
--- a/porting/liteos_a/kernel/include/netinet/ip_icmp.h
+++ b/porting/liteos_a/kernel/include/netinet/ip_icmp.h
@@ -69,7 +69,6 @@ struct icmphdr {
 #define ICMP_EXC_TTL		0
 #define ICMP_EXC_FRAGTIME	1
 
-#define ICMP_FILTER 1
 
 struct icmp_ra_addr {
 	uint32_t ira_addr;
@@ -115,10 +114,6 @@ struct icmp {
 	} icmp_dun;
 };
 
-struct icmp_filter {
-	uint32_t data;
-};
-
 #define	icmp_pptr	icmp_hun.ih_pptr
 #define	icmp_gwaddr	icmp_hun.ih_gwaddr
 #define	icmp_id		icmp_hun.ih_idseq.icd_id
diff --git a/porting/liteos_a/kernel/include/netinet/tcp.h b/porting/liteos_a/kernel/include/netinet/tcp.h
index cc5fbd596ec8fe880fe37e3ba65b7b669208e9b0..44a007aaf5a252f21f5e5c76ec5fafd69267cf69 100644
--- a/porting/liteos_a/kernel/include/netinet/tcp.h
+++ b/porting/liteos_a/kernel/include/netinet/tcp.h
@@ -54,13 +54,6 @@
 #define TCP_LISTEN       10
 #define TCP_CLOSING      11
 
-enum {
-	TCP_NO_QUEUE,
-	TCP_RECV_QUEUE,
-	TCP_SEND_QUEUE,
-	TCP_QUEUES_NR,
-};
-
 enum {
 	TCP_NLA_PAD,
 	TCP_NLA_BUSY,
diff --git a/porting/liteos_a/kernel/include/poll.h b/porting/liteos_a/kernel/include/poll.h
index 08063a0184d9810136bae210147133eaa05cbf6d..f4a7f75fd8fb1c67d38aeb185d8f31821aeb3f0f 100644
--- a/porting/liteos_a/kernel/include/poll.h
+++ b/porting/liteos_a/kernel/include/poll.h
@@ -1,5 +1,5 @@
-#ifndef	_SYS_POLL_H
-#define	_SYS_POLL_H
+#ifndef	_POLL_H
+#define	_POLL_H
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/porting/liteos_a/kernel/include/signal.h b/porting/liteos_a/kernel/include/signal.h
index 50ebb1bf7d1d56d1cb4348872a0524b9be7e0d69..99d63585c04dc277374c62e8acdca66eedca2536 100644
--- a/porting/liteos_a/kernel/include/signal.h
+++ b/porting/liteos_a/kernel/include/signal.h
@@ -94,34 +94,34 @@ typedef struct sigaltstack stack_t;
 #define CLD_CONTINUED 6
 
 union sigval {
-    int sival_int;
-    void *sival_ptr;
+	int sival_int;
+	void *sival_ptr;
 };
 
 typedef struct {
-    int si_signo, si_errno, si_code;
-    union {
-        char __pad[128 - 2*sizeof(int) - sizeof(long)];
-        struct {
-            union {
-                struct {
-                    pid_t si_pid;
-                    uid_t si_uid;
-                } __piduid;
-                struct {
-                    int si_timerid;
-                    int si_overrun;
-                } __timer;
-            } __first;
-            union {
-                union sigval si_value;
-                struct {
-                    int si_status;
-                    clock_t si_utime, si_stime;
-                } __sigchld;
-            } __second;
-        } __si_common;
-    } __si_fields;
+	int si_signo, si_errno, si_code;
+	union {
+		char __pad[128 - 2*sizeof(int) - sizeof(long)];
+		struct {
+			union {
+				struct {
+					pid_t si_pid;
+					uid_t si_uid;
+				} __piduid;
+				struct {
+					int si_timerid;
+					int si_overrun;
+				} __timer;
+			} __first;
+			union {
+				union sigval si_value;
+				struct {
+					int si_status;
+					clock_t si_utime, si_stime;
+				} __sigchld;
+			} __second;
+		} __si_common;
+	} __si_fields;
 } siginfo_t;
 #define si_pid     __si_fields.__si_common.__first.__piduid.si_pid
 #define si_uid     __si_fields.__si_common.__first.__piduid.si_uid
@@ -133,22 +133,22 @@ typedef struct {
 #define si_overrun __si_fields.__si_common.__first.__timer.si_overrun
 
 struct sigaction {
-    union {
-        void (*sa_handler)(int);
-        void (*sa_sigaction)(int, siginfo_t *, void *);
-    } sa_sigactionhandler;
-    sigset_t sa_mask;
-    int sa_flags;
-    void (*sa_restorer)(void);
+	union {
+		void (*sa_handler)(int);
+		void (*sa_sigaction)(int, siginfo_t *, void *);
+	} sa_sigactionhandler;
+	sigset_t sa_mask;
+	int sa_flags;
+	void (*sa_restorer)(void);
 };
 #define sa_handler   sa_sigactionhandler.sa_handler
 #define sa_sigaction sa_sigactionhandler.sa_sigaction
 
 struct sigevent {
-    union sigval sigev_value;
-    int sigev_signo;
-    int sigev_notify;
-    void (*sigev_notify_function)(union sigval);
+	union sigval sigev_value;
+	int sigev_signo;
+	int sigev_notify;
+	void (*sigev_notify_function)(union sigval);
     void *sigev_notify_attributes;
 };
 
diff --git a/porting/liteos_a/kernel/include/stdalign.h b/porting/liteos_a/kernel/include/stdalign.h
index 13c70d234e023912ac5586f94114353aa36c93d9..2cc94be3f6d7e4b65839cbcd35a1e5286139e4c8 100644
--- a/porting/liteos_a/kernel/include/stdalign.h
+++ b/porting/liteos_a/kernel/include/stdalign.h
@@ -5,9 +5,7 @@
 
 /* this whole header only works in C11 or with compiler extensions */
 #if __STDC_VERSION__ < 201112L && defined( __GNUC__)
-#undef _Alignas
 #define _Alignas(t) __attribute__((__aligned__(t)))
-#undef _Alignof
 #define _Alignof(t) __alignof__(t)
 #endif
 
diff --git a/porting/liteos_a/kernel/include/stdio.h b/porting/liteos_a/kernel/include/stdio.h
index d56a7472137bf2d7204609d6b1ce21fed319fa18..91c3172487ac29c59da2127ba713ecea40a14f87 100644
--- a/porting/liteos_a/kernel/include/stdio.h
+++ b/porting/liteos_a/kernel/include/stdio.h
@@ -12,7 +12,6 @@ extern "C" {
 #define __NEED_size_t
 
 #if __STDC_VERSION__ < 201112L
-#define __NEED_off_t
 #define __NEED_struct__IO_FILE
 #endif
 
diff --git a/porting/liteos_a/kernel/include/string.h b/porting/liteos_a/kernel/include/string.h
index 2472f570587cd60f331043d6b15cacca5c0642df..816909e05ae4747fa143c16c1188148591282c72 100644
--- a/porting/liteos_a/kernel/include/string.h
+++ b/porting/liteos_a/kernel/include/string.h
@@ -98,8 +98,6 @@ char *basename(const char *);
 #endif
 #endif
 
-#include "../src/include/string.h"
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/porting/liteos_a/kernel/include/sys/mman.h b/porting/liteos_a/kernel/include/sys/mman.h
index 691185a2f0de34cadfecb8917dc18cc1e33ccd9a..8bbb36b21dfe3e8429d4c7cd5517adaf30017dcc 100644
--- a/porting/liteos_a/kernel/include/sys/mman.h
+++ b/porting/liteos_a/kernel/include/sys/mman.h
@@ -146,8 +146,6 @@ int shm_unlink (const char *);
 #define mmap64 mmap
 #endif
 
-#include "../src/include/sys/mman.h"
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/porting/liteos_a/kernel/include/sys/reboot.h b/porting/liteos_a/kernel/include/sys/reboot.h
index 28f95470404bd88570007f9fd76d3f25094ac98d..9702eddba4ba24accb231b81d9e7ed0f79d37656 100644
--- a/porting/liteos_a/kernel/include/sys/reboot.h
+++ b/porting/liteos_a/kernel/include/sys/reboot.h
@@ -5,6 +5,14 @@ extern "C" {
 #endif
 
 #define RB_AUTOBOOT     0x01234567
+#define RB_HALT_SYSTEM  0xcdef0123
+#define RB_ENABLE_CAD   0x89abcdef
+#define RB_DISABLE_CAD  0
+#define RB_POWER_OFF    0x4321fedc
+#define RB_SW_SUSPEND   0xd000fce2
+#define RB_KEXEC        0x45584543
+
+int reboot(int);
 
 #ifdef __cplusplus
 }
diff --git a/porting/liteos_a/kernel/include/sys/select.h b/porting/liteos_a/kernel/include/sys/select.h
index 8880e86f7b980e6436ba4b6fc1b3a04145768be6..d7e269aac03bd4fd8a49c960ef291d950fd523a1 100644
--- a/porting/liteos_a/kernel/include/sys/select.h
+++ b/porting/liteos_a/kernel/include/sys/select.h
@@ -20,7 +20,7 @@ extern "C" {
 
 /* FD_SETSIZE is defined in "vfs_config.h" */
 #else
-#define FD_SETSIZE 512
+#define FD_SETSIZE 1024
 #define FD_SET_TOTAL_SIZE FD_SETSIZE
 #endif
 
diff --git a/porting/liteos_a/kernel/include/sys/stat.h b/porting/liteos_a/kernel/include/sys/stat.h
index 62c53046169fad67d748bf6d44d2bb1910983f54..97c4fff7f5f2dd736bb7f8f2463511279d94cc46 100644
--- a/porting/liteos_a/kernel/include/sys/stat.h
+++ b/porting/liteos_a/kernel/include/sys/stat.h
@@ -6,11 +6,6 @@ extern "C" {
 
 #include <features.h>
 
-#define __NEED_uint16_t
-#define __NEED_uint32_t
-#define __NEED_uint64_t
-#define __NEED_int32_t
-#define __NEED_int64_t
 #define __NEED_dev_t
 #define __NEED_ino_t
 #define __NEED_mode_t
@@ -19,7 +14,6 @@ extern "C" {
 #define __NEED_gid_t
 #define __NEED_off_t
 #define __NEED_time_t
-#define __NEED_suseconds_t
 #define __NEED_blksize_t
 #define __NEED_blkcnt_t
 #define __NEED_struct_timespec
@@ -106,13 +100,13 @@ int lchmod(const char *, mode_t);
 
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
 #define stat64 stat
+int fstat64(int, struct stat64 *);
 #define lstat64 lstat
 #define fstatat64 fstatat
 #define blkcnt64_t blkcnt_t
 #define fsblkcnt64_t fsblkcnt_t
 #define fsfilcnt64_t fsfilcnt_t
 #define ino64_t ino_t
-int fstat64(int, struct stat64 *);
 #endif
 
 #if _REDIR_TIME64
diff --git a/porting/liteos_a/kernel/include/time.h b/porting/liteos_a/kernel/include/time.h
index 7c7b34776665304afc1bf812ef3ef7a4c413295d..51cc5d6c424e18393bb1f218805666536eacde96 100644
--- a/porting/liteos_a/kernel/include/time.h
+++ b/porting/liteos_a/kernel/include/time.h
@@ -172,8 +172,6 @@ __REDIR(timegm, __timegm_time64);
 #endif
 #endif
 
-#include "../src/include/time.h"
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/porting/liteos_a/kernel/include/unistd.h b/porting/liteos_a/kernel/include/unistd.h
index cb9dd803602021656f09c0619b907edfdf00b7d8..7a80a7afcea9d41c9cab08a5098ede071d98218e 100644
--- a/porting/liteos_a/kernel/include/unistd.h
+++ b/porting/liteos_a/kernel/include/unistd.h
@@ -73,30 +73,6 @@ int ftruncate(int, off_t);
 int access(const char *, int);
 int faccessat(int, const char *, int, int);
 
-
-/* Format options */
-#define FMT_FAT      0x01
-#define FMT_FAT32    0x02
-#define FMT_ANY      0x07
-#define FMT_ERASE    0x08
-
-/** 
-  * @brief format FAT device (SD card, U disk, and MMC card), this function is OHOS-specific
-  * @param dev device name.
-  * @param sectors sectors per cluster, can be 0 OR power of 2. The sector size for standard FAT volumes is 512 bytes.
-  *    -- sector number is 0 OR >128: automatically choose the appropriate cluster size.
-  *    -- sector number is 1 ~ 128: cluster size = sectors per cluster * 512B.
-  * @param option file system type.
-  *    -- FMT_FAT
-  *    -- FMT_FAT32
-  *    -- FMT_ANY
-  *    -- FMT_ERASE (USB not supported)
-  * @return format result
-  * @retval -1 format error
-  * @retval 0 format successful
-  */
-int format(const char *dev, int sectors, int option);
-
 int chdir(const char *);
 int fchdir(int);
 char *getcwd(char *, size_t);
@@ -216,12 +192,14 @@ ssize_t copy_file_range(int, off_t *, int, off_t *, size_t, unsigned);
 #endif
 
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
-#define lockf64 lockf
 off64_t lseek64(int, off64_t, int);
 ssize_t pread64(int, void *, size_t, off64_t);
 ssize_t pwrite64(int, const void *, size_t, off64_t);
 int truncate64(const char *, off64_t);
 int ftruncate64(int, off64_t);
+off_t _lseek(int fd, off_t offset, int whence);
+off64_t _lseek64(int fd, int offsetHigh, int offsetLow, off64_t *result, int whence);
+#define lockf64 lockf
 #endif
 
 #define POSIX_CLOSE_RESTART     0
diff --git a/porting/liteos_a/kernel/include/wchar.h b/porting/liteos_a/kernel/include/wchar.h
index 3ee3b00b082eecf0a1a7f3f1b7a00993c43814d7..88eb55b18cc1ff04819adb40f75fb8c33d860af8 100644
--- a/porting/liteos_a/kernel/include/wchar.h
+++ b/porting/liteos_a/kernel/include/wchar.h
@@ -15,7 +15,6 @@ extern "C" {
 #define __NEED_mbstate_t
 
 #if __STDC_VERSION__ < 201112L
-#define __NEED_off_t
 #define __NEED_struct__IO_FILE
 #endif
 
diff --git a/porting/liteos_a/kernel/musl.gni b/porting/liteos_a/kernel/musl.gni
index ae272ee0571cd36a57c11002addcd7b849e46753..0d421fda973999072c344263cf9ea27bffd8cade 100644
--- a/porting/liteos_a/kernel/musl.gni
+++ b/porting/liteos_a/kernel/musl.gni
@@ -39,12 +39,8 @@ MUSL_SRC_COMMON = [
   "$MUSLPORTINGDIR/src/ctype/isxdigit.c",
   "$MUSLPORTINGDIR/src/ctype/tolower.c",
   "$MUSLPORTINGDIR/src/ctype/toupper.c",
-  "$MUSLPORTINGDIR/src/env/getenv.c",
-  "$MUSLPORTINGDIR/src/errno/errno.c",
   "$MUSLPORTINGDIR/src/errno/strerror.c",
-  "$MUSLPORTINGDIR/src/exit/abort.c",
   "$MUSLPORTINGDIR/src/exit/assert.c",
-  "$MUSLPORTINGDIR/src/exit/exit.c",
   "$MUSLPORTINGDIR/src/fenv/fenv.c",
   "$MUSLPORTINGDIR/src/internal/floatscan.c",
   "$MUSLPORTINGDIR/src/internal/intscan.c",
@@ -55,7 +51,6 @@ MUSL_SRC_COMMON = [
   "$MUSLPORTINGDIR/src/locale/c_locale.c",
   "$MUSLPORTINGDIR/src/locale/langinfo.c",
   "$MUSLPORTINGDIR/src/locale/locale_map.c",
-  "$MUSLPORTINGDIR/src/malloc/malloc.c",
   "$MUSLPORTINGDIR/src/math/__cos.c",
   "$MUSLPORTINGDIR/src/math/__cosdf.c",
   "$MUSLPORTINGDIR/src/math/__cosl.c",
@@ -294,9 +289,7 @@ MUSL_SRC_COMMON = [
   "$MUSLPORTINGDIR/src/network/htons.c",
   "$MUSLPORTINGDIR/src/network/ntohl.c",
   "$MUSLPORTINGDIR/src/network/ntohs.c",
-  "$MUSLPORTINGDIR/src/prng/rand.c",
   "$MUSLPORTINGDIR/src/prng/random.c",
-  "$MUSLPORTINGDIR/src/sched/sched_yield.c",
   "$MUSLPORTINGDIR/src/stdio/__fdopen.c",
   "$MUSLPORTINGDIR/src/stdio/__fmodeflags.c",
   "$MUSLPORTINGDIR/src/stdio/__lockfile.c",
@@ -390,7 +383,6 @@ MUSL_SRC_COMMON = [
   "$MUSLPORTINGDIR/src/time/mktime.c",
   "$MUSLPORTINGDIR/src/time/strftime.c",
   "$MUSLPORTINGDIR/src/time/strptime.c",
-  "$MUSLPORTINGDIR/src/time/time.c",
 ]
 
 MUSL_SRC_ARM = [
diff --git a/porting/liteos_a/kernel/src/env/getenv.c b/porting/liteos_a/kernel/src/env/getenv.c
deleted file mode 100644
index 81499d095e40bc59728b994082d18fee60d5579a..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/env/getenv.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "stdlib.h"
-#include "string.h"
-#include "los_exc.h"
-
-/*
- * getenv --
- *  Returns ptr to value associated with name, if any, else NULL.
- */
-char *
-getenv(const char *name)
-{
-#ifdef LOSCFG_LLTREPORT
-    if (strncmp(name, "GCOV_PREFIX", sizeof("GCOV_PREFIX")) == 0) {
-#ifdef LOSCFG_LLTSER
-        extern const char *gcov_dir;
-        return (char *)gcov_dir;
-#else
-        return "/bin/vs/sd";
-#endif
-    }
-    if (strncmp(name, "GCOV_PREFIX_STRIP", sizeof("GCOV_PREFIX_STRIP")) == 0)
-        return "6";
-#endif
-    return (NULL);
-}
diff --git a/porting/liteos_a/kernel/src/errno/__strerror.h b/porting/liteos_a/kernel/src/errno/__strerror.h
index ca41be08ffb6879e803624496fcde4066e8977d5..2f04d400b3fc9f00dc4b555c14618c98c09a4081 100644
--- a/porting/liteos_a/kernel/src/errno/__strerror.h
+++ b/porting/liteos_a/kernel/src/errno/__strerror.h
@@ -103,5 +103,3 @@ E(EMEDIUMTYPE,  "Wrong medium type")
 E(EMULTIHOP,    "Multihop attempted")
 
 E(0,            "No error information")
-
-E(ENOSUPP,      "Operation not supported")
diff --git a/porting/liteos_a/kernel/src/errno/errno.c b/porting/liteos_a/kernel/src/errno/errno.c
deleted file mode 100644
index 03cb605950613a04fbda87e7c7a8eb739b329df6..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/errno/errno.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "errno.h"
-#include "los_errno.h"
-#include "los_task_pri.h"
-
-/* the specific errno get or set in interrupt service routine */
-static int errno_isr;
-
-void set_errno(int err_code) {
-  LosTaskCB *runTask = NULL;
-
-  /* errno can not be set to 0 as posix standard */
-  if (err_code == 0)
-    return;
-
-  if (OS_INT_INACTIVE) {
-    runTask = OsCurrTaskGet();
-    runTask->errorNo = err_code;
-  }
-  else {
-    errno_isr = err_code;
-  }
-}
-
-int get_errno(void) {
-  LosTaskCB *runTask = NULL;
-
-  if (OS_INT_INACTIVE) {
-    runTask = OsCurrTaskGet();
-    return runTask->errorNo;
-  }
-  else {
-    return errno_isr;
-  }
-}
-
-int *__errno_location(void) {
-  LosTaskCB *runTask = NULL;
-
-  if (OS_INT_INACTIVE) {
-    runTask = OsCurrTaskGet();
-    return &runTask->errorNo;
-  }
-  else {
-    return &errno_isr;
-  }
-}
-
-volatile int *__errno(void) {
-  LosTaskCB *runTask = NULL;
-
-  if (OS_INT_INACTIVE) {
-    runTask = OsCurrTaskGet();
-    return (volatile int *)(&runTask->errorNo);
-  }
-  else {
-    return (volatile int *)(&errno_isr);
-  }
-}
diff --git a/porting/liteos_a/kernel/src/errno/strerror.c b/porting/liteos_a/kernel/src/errno/strerror.c
index b8ee518e5064b30122f58531a7a7c1e8d024c8ea..3a93eea66456bca34df1f04b85601e6c61ccaf43 100644
--- a/porting/liteos_a/kernel/src/errno/strerror.c
+++ b/porting/liteos_a/kernel/src/errno/strerror.c
@@ -2,10 +2,6 @@
 #include <string.h>
 #include "locale_impl.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #define E(a,b) ((unsigned char)a),
 static const unsigned char errid[] = {
 #include "__strerror.h"
@@ -33,7 +29,3 @@ char *strerror(int e)
 }
 
 weak_alias(__strerror_l, strerror_l);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/porting/liteos_a/kernel/src/exit/abort.c b/porting/liteos_a/kernel/src/exit/abort.c
deleted file mode 100644
index 5a3a5d63286f4d4368bd60eb3bc4172886af5905..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/exit/abort.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "stdlib.h"
-#include "string.h"
-#include "los_exc.h"
-
-void abort(void) {
-  LOS_Panic("System was being aborted\n");
-  while (1);
-}
\ No newline at end of file
diff --git a/porting/liteos_a/kernel/src/exit/assert.c b/porting/liteos_a/kernel/src/exit/assert.c
index 51938edda87cfb369438c3847a8ec750050e59b6..81c64a7d30b561297a3543e89bcc1a5c8647cdf2 100644
--- a/porting/liteos_a/kernel/src/exit/assert.c
+++ b/porting/liteos_a/kernel/src/exit/assert.c
@@ -1,61 +1,10 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
 #include "assert.h"
-#include "los_hwi.h"
 #include "los_printf.h"
 #include "los_exc.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-void __assert(const char* file, int line, const char* expr) {
-  PRINT_ERR("__assert error: %s, %d, %s\n", file, line, expr);
-  LOS_Panic("__assert error:\n");
-  while (1);
-}
-
-void __assert2(const char* file, int line, const char* func, const char* expr) {
-  PRINT_ERR("%s:%d: %s: assertion \"%s\" failed", file, line, func, expr);
-  LOS_Panic("__assert error:\n");
-  while (1);
-}
-
-void __assert_fail(const char* expr, const char* file, int line, const char* func) {
-  PRINT_ERR("%s:%d: %s: assertion \"%s\" failed", file, line, func, expr);
-  LOS_Panic("__assert error:\n");
-  while (1);
-}
-
-#ifdef __cplusplus
+_Noreturn void __assert_fail(const char *expr, const char *file, int line, const char *func)
+{
+	PRINT_ERR("%s:%d: %s: assertion \"%s\" failed", file, line, func, expr);
+	LOS_Panic("__assert error:\n");
+	while (1);
 }
-#endif /* __cplusplus */
\ No newline at end of file
diff --git a/porting/liteos_a/kernel/src/exit/exit.c b/porting/liteos_a/kernel/src/exit/exit.c
deleted file mode 100644
index 4fd2028ca943e193bd1f86e8fc9564227956ee7b..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/exit/exit.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <errno.h>
-#include "los_printf.h"
-
-void _exit(int status) {
-  PRINT_ERR("%s NOT SUPPORT\n", __FUNCTION__);
-  errno = ENOSYS;
-  while (1);
-}
-
-void exit(int status) {
-  PRINT_ERR("%s NOT SUPPORT\n", __FUNCTION__);
-  errno = ENOSYS;
-  while (1);
-}
diff --git a/porting/liteos_a/kernel/src/include/features.h b/porting/liteos_a/kernel/src/include/features.h
index 3c16def3713914fd1aad33ca86ef4d8d5b526c12..dcf8461d27b1b9b91600a9e70440870c16e6694d 100644
--- a/porting/liteos_a/kernel/src/include/features.h
+++ b/porting/liteos_a/kernel/src/include/features.h
@@ -4,12 +4,7 @@
 #include "../../include/features.h"
 
 #define hidden __attribute__((__visibility__("hidden")))
-#ifndef weak_alias
 #define weak_alias(old, new) \
-    extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
-#endif
-#ifndef strong_alias
-#define strong_alias(old, new) \
-    extern __typeof(old) new __attribute__((__alias__(#old)))
-#endif
+	extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
+
 #endif
diff --git a/porting/liteos_a/kernel/src/internal/floatscan.c b/porting/liteos_a/kernel/src/internal/floatscan.c
index 04f55d0c4a84aae6e27e80191fb2f1323b9e534f..8c0828fcb39e6e0e742309913eef1aa955e582e5 100644
--- a/porting/liteos_a/kernel/src/internal/floatscan.c
+++ b/porting/liteos_a/kernel/src/internal/floatscan.c
@@ -185,7 +185,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 			x[k] = x[k]/p10 + carry;
 			carry = 1000000000/p10 * tmp;
 			if (k==a && !x[k]) {
-				a = ((a+1) & MASK);
+				a = (a+1 & MASK);
 				rp -= 9;
 			}
 		}
@@ -197,7 +197,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
 		uint32_t carry = 0;
 		e2 -= 29;
-		for (k=((z-1) & MASK); ; k=((k-1) & MASK)) {
+		for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
 			uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
 			if (tmp > 1000000000) {
 				carry = tmp / 1000000000;
@@ -206,15 +206,15 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 				carry = 0;
 				x[k] = tmp;
 			}
-			if (k==((z-1) & MASK) && k!=a && !x[k]) z = k;
+			if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
 			if (k==a) break;
 		}
 		if (carry) {
 			rp += 9;
-			a = ((a-1) & MASK);
+			a = (a-1 & MASK);
 			if (a == z) {
-				z = ((z-1) & MASK);
-				x[(z-1) & MASK] |= x[z];
+				z = (z-1 & MASK);
+				x[z-1 & MASK] |= x[z];
 			}
 			x[a] = carry;
 		}
@@ -225,39 +225,39 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 		uint32_t carry = 0;
 		int sh = 1;
 		for (i=0; i<LD_B1B_DIG; i++) {
-			k = ((a+i) & MASK);
+			k = (a+i & MASK);
 			if (k == z || x[k] < th[i]) {
 				i=LD_B1B_DIG;
 				break;
 			}
-			if (x[(a+i) & MASK] > th[i]) break;
+			if (x[a+i & MASK] > th[i]) break;
 		}
 		if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
 		/* FIXME: find a way to compute optimal sh */
 		if (rp > 9+9*LD_B1B_DIG) sh = 9;
 		e2 += sh;
-		for (k=a; k!=z; k=((k+1) & MASK)) {
-			uint32_t tmp = x[k] & ((1<<sh)-1);
+		for (k=a; k!=z; k=(k+1 & MASK)) {
+			uint32_t tmp = x[k] & (1<<sh)-1;
 			x[k] = (x[k]>>sh) + carry;
 			carry = (1000000000>>sh) * tmp;
 			if (k==a && !x[k]) {
-				a = ((a+1) & MASK);
+				a = (a+1 & MASK);
 				i--;
 				rp -= 9;
 			}
 		}
 		if (carry) {
-			if (((z+1) & MASK) != a) {
+			if ((z+1 & MASK) != a) {
 				x[z] = carry;
-				z = ((z+1) & MASK);
-			} else x[(z-1) & MASK] |= 1;
+				z = (z+1 & MASK);
+			} else x[z-1 & MASK] |= 1;
 		}
 	}
 
 	/* Assemble desired bits into floating point variable */
 	for (y=i=0; i<LD_B1B_DIG; i++) {
-		if (((a+i) & MASK)==z) x[(z=((z+1) & MASK))-1] = 0;
-		y = 1000000000.0L * y + x[(a+i) & MASK];
+		if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
+		y = 1000000000.0L * y + x[a+i & MASK];
 	}
 
 	y *= sign;
@@ -278,14 +278,14 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	}
 
 	/* Process tail of decimal input so it can affect rounding */
-	if (((a+i) & MASK) != z) {
-		uint32_t t = x[(a+i) & MASK];
-		if (t < 500000000 && (t || ((a+i+1) & MASK) != z))
+	if ((a+i & MASK) != z) {
+		uint32_t t = x[a+i & MASK];
+		if (t < 500000000 && (t || (a+i+1 & MASK) != z))
 			frac += 0.25*sign;
 		else if (t > 500000000)
 			frac += 0.75*sign;
 		else if (t == 500000000) {
-			if (((a+i+1) & MASK) == z)
+			if ((a+i+1 & MASK) == z)
 				frac += 0.5*sign;
 			else
 				frac += 0.75*sign;
@@ -297,7 +297,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	y += frac;
 	y -= bias;
 
-	if (((e2+LDBL_MANT_DIG) & INT_MAX) > emax-5) {
+	if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
 		if (fabsl(y) >= 2/LDBL_EPSILON) {
 			if (denormal && bits==LDBL_MANT_DIG+e2-emin)
 				denormal = 0;
diff --git a/porting/liteos_a/kernel/src/internal/intscan.c b/porting/liteos_a/kernel/src/internal/intscan.c
index 7ebb389fc7f09430d2f14c01c2e9718acd706c78..a4a5ae861282863035a492ce8db0e18d4acfe3ac 100644
--- a/porting/liteos_a/kernel/src/internal/intscan.c
+++ b/porting/liteos_a/kernel/src/internal/intscan.c
@@ -67,7 +67,7 @@ unsigned long long __intscan(FILE *f, unsigned base, int pok, unsigned long long
 		for (y=x; c-'0'<10U && y<=ULLONG_MAX/10 && 10*y<=ULLONG_MAX-(c-'0'); c=shgetc(f))
 			y = y*10 + (c-'0');
 		if (c-'0'>=10U) goto done;
-	} else if (!(base & (base-1))) {
+	} else if (!(base & base-1)) {
 		int bs = "\0\1\2\4\7\3\6\5"[(0x17*base)>>5&7];
 		for (x=0; val[c]<base && x<=UINT_MAX/32; c=shgetc(f))
 			x = x<<bs | val[c];
diff --git a/porting/liteos_a/kernel/src/internal/shgetc.c b/porting/liteos_a/kernel/src/internal/shgetc.c
index fcf7908826710e029f558d7925ca073d82ea28df..a4a9c633dc976033622003c3cc7e5068466076bd 100644
--- a/porting/liteos_a/kernel/src/internal/shgetc.c
+++ b/porting/liteos_a/kernel/src/internal/shgetc.c
@@ -20,7 +20,7 @@ int __shgetc(FILE *f)
 {
 	int c;
 	off_t cnt = shcnt(f);
-	if (((f->shlim) && (cnt >= f->shlim)) || ((c=__uflow(f)) < 0)) {
+	if (f->shlim && cnt >= f->shlim || (c=__uflow(f)) < 0) {
 		f->shcnt = f->buf - f->rpos + cnt;
 		f->shend = f->rpos;
 		f->shlim = -1;
diff --git a/porting/liteos_a/kernel/src/internal/stdio_impl.h b/porting/liteos_a/kernel/src/internal/stdio_impl.h
index 1a95fd103f881424cde60b409273b43b8272843a..e149fa0541d1fbb217bb9732caa1a181c5fe7726 100644
--- a/porting/liteos_a/kernel/src/internal/stdio_impl.h
+++ b/porting/liteos_a/kernel/src/internal/stdio_impl.h
@@ -16,6 +16,32 @@
 #define F_SVB 64
 #define F_APP 128
 
+struct _IO_FILE {
+	unsigned flags;
+	unsigned char *rpos, *rend;
+	int (*close)(struct _IO_FILE *);
+	unsigned char *wend, *wpos;
+	unsigned char *mustbezero_1;
+	unsigned char *wbase;
+	size_t (*read)(struct _IO_FILE *, unsigned char *, size_t);
+	size_t (*write)(struct _IO_FILE *, const unsigned char *, size_t);
+	off_t (*seek)(struct _IO_FILE *, off_t, int);
+	unsigned char *buf;
+	size_t buf_size;
+	struct _IO_FILE *prev, *next;
+	int fd;
+	int pipe_pid;
+	int mode;
+	void *lock;
+	int lbf;
+	void *cookie;
+	off_t off;
+	char *getln_buf;
+	void *mustbezero_2;
+	unsigned char *shend;
+	off_t shlim, shcnt;
+	struct __locale_struct *locale;
+};
 
 extern hidden FILE *volatile __stdin_used;
 extern hidden FILE *volatile __stdout_used;
diff --git a/porting/liteos_a/kernel/src/locale/__mo_lookup.c b/porting/liteos_a/kernel/src/locale/__mo_lookup.c
index fa3e0c4ba89d918d1026218131f74d9e6ddd9bd4..d18ab7744246bd286fbc8a67117c320a29169700 100644
--- a/porting/liteos_a/kernel/src/locale/__mo_lookup.c
+++ b/porting/liteos_a/kernel/src/locale/__mo_lookup.c
@@ -3,7 +3,7 @@
 
 static inline uint32_t swapc(uint32_t x, int c)
 {
-	return c ? (x>>24) | ((x>>8)&(0xff00)) | ((x<<8)&(0xff0000)) | (x<<24) : x;
+	return c ? x>>24 | x>>8&0xff00 | x<<8&0xff0000 | x<<24 : x;
 }
 
 const char *__mo_lookup(const void *p, size_t size, const char *s)
diff --git a/porting/liteos_a/kernel/src/malloc/malloc.c b/porting/liteos_a/kernel/src/malloc/malloc.c
deleted file mode 100644
index ccac6fcce26b1bc589a12c4e25b2177118bd3f80..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/malloc/malloc.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "stdlib.h"
-#include "string.h"
-#include "los_vm_map.h"
-
-/*
- * Allocates the requested memory and returns a pointer to it. The requested
- * size is nitems each size bytes long (total memory requested is nitems*size).
- * The space is initialized to all zero bits.
- */
-
-void* calloc(size_t nitems, size_t size) { /*lint !e578*/
-  size_t real_size;
-  void* ptr = NULL;
-
-  if (nitems == 0 || size == 0) {
-    return NULL;
-  }
-
-  real_size = (size_t)(nitems * size);
-  ptr = LOS_KernelMalloc((UINT32)real_size);
-  if (ptr != NULL) {
-    (void)memset_s((void *)ptr, real_size, 0, real_size);
-  }
-  return ptr;
-}
-
-/*
- * Deallocates the memory previously allocated by a call to calloc, malloc, or
- * realloc. The argument ptr points to the space that was previously allocated.
- * If ptr points to a memory block that was not allocated with calloc, malloc,
- * or realloc, or is a space that has been deallocated, then the result is undefined.
- */
-
-void free(void* ptr) {
-  if (ptr == NULL) {
-    return;
-  }
-
-  LOS_KernelFree(ptr);
-}
-
-/*
- * Allocates the requested memory and returns a pointer to it. The requested
- * size is size bytes. The value of the space is indeterminate.
- */
-
-void* malloc(size_t size) { /*lint !e31 !e10*/
-  if (size == 0) {
-    return NULL;
-  }
-
-  return LOS_KernelMalloc((UINT32)size);
-}
-
-void* zalloc(size_t size) { /*lint !e10*/
-  void* ptr = NULL;
-
-  if (size == 0) {
-    return NULL;
-  }
-
-  ptr = LOS_KernelMalloc((UINT32)size);
-  if (ptr != NULL) {
-    (void)memset_s(ptr, size, 0, size);
-  }
-  return ptr;
-}
-
-/*
- * allocates a block of size bytes whose address is a multiple of boundary.
- * The boundary must be a power of two!
- */
-
-void* memalign(size_t boundary, size_t size) {
-  if (size == 0) {
-    return NULL;
-  }
-
-  return LOS_KernelMallocAlign((UINT32)size, (UINT32)boundary);
-}
-
-/*
- * Attempts to resize the memory block pointed to by ptr that was previously
- * allocated with a call to malloc or calloc. The contents pointed to by ptr are
- * unchanged. If the value of size is greater than the previous size of the
- * block, then the additional bytes have an undeterminate value. If the value
- * of size is less than the previous size of the block, then the difference of
- * bytes at the end of the block are freed. If ptr is null, then it behaves like
- * malloc. If ptr points to a memory block that was not allocated with calloc
- * or malloc, or is a space that has been deallocated, then the result is
- * undefined. If the new space cannot be allocated, then the contents pointed
- * to by ptr are unchanged. If size is zero, then the memory block is completely
- * freed.
- */
-
-void* realloc(void* ptr, size_t size) {
-  if (ptr == NULL) {
-    ptr = malloc(size);
-    return ptr;
-  }
-
-  if (size == 0) {
-    free(ptr);
-    return NULL;
-  }
-
-  return LOS_KernelRealloc(ptr, (UINT32)size);
-}
\ No newline at end of file
diff --git a/porting/liteos_a/kernel/src/math/acos.c b/porting/liteos_a/kernel/src/math/acos.c
index 6104a32bc90e53a962e060004dfa1fe48a375226..ea9c87bf087809f9a6b1fa6a2ed2f065d8184f72 100644
--- a/porting/liteos_a/kernel/src/math/acos.c
+++ b/porting/liteos_a/kernel/src/math/acos.c
@@ -69,7 +69,7 @@ double acos(double x)
 		uint32_t lx;
 
 		GET_LOW_WORD(lx,x);
-		if (((ix-0x3ff00000) | lx) == 0) {
+		if ((ix-0x3ff00000 | lx) == 0) {
 			/* acos(1)=0, acos(-1)=pi */
 			if (hx >> 31)
 				return 2*pio2_hi + 0x1p-120f;
diff --git a/porting/liteos_a/kernel/src/math/asin.c b/porting/liteos_a/kernel/src/math/asin.c
index 96b4cdfaaaaf64782b3d0243a3ff115af60b0567..c926b188552b20b1842a26e4c5500b2f0686a95f 100644
--- a/porting/liteos_a/kernel/src/math/asin.c
+++ b/porting/liteos_a/kernel/src/math/asin.c
@@ -75,7 +75,7 @@ double asin(double x)
 	if (ix >= 0x3ff00000) {
 		uint32_t lx;
 		GET_LOW_WORD(lx, x);
-		if (((ix-0x3ff00000) | lx) == 0)
+		if ((ix-0x3ff00000 | lx) == 0)
 			/* asin(1) = +-pi/2 with inexact */
 			return x*pio2_hi + 0x1p-120f;
 		return 0/(x-x);
diff --git a/porting/liteos_a/kernel/src/math/atan2.c b/porting/liteos_a/kernel/src/math/atan2.c
index 91378b977a25e42c65d744a2d05208670fb7705c..5a1903c6240821b70e6993f3769563c5eb1ba18f 100644
--- a/porting/liteos_a/kernel/src/math/atan2.c
+++ b/porting/liteos_a/kernel/src/math/atan2.c
@@ -52,7 +52,7 @@ double atan2(double y, double x)
 		return x+y;
 	EXTRACT_WORDS(ix, lx, x);
 	EXTRACT_WORDS(iy, ly, y);
-	if (((ix-0x3ff00000) | lx) == 0)  /* x = 1.0 */
+	if ((ix-0x3ff00000 | lx) == 0)  /* x = 1.0 */
 		return atan(y);
 	m = ((iy>>31)&1) | ((ix>>30)&2);  /* 2*sign(x)+sign(y) */
 	ix = ix & 0x7fffffff;
diff --git a/porting/liteos_a/kernel/src/math/fma.c b/porting/liteos_a/kernel/src/math/fma.c
index 139f53299e365b6010b3a3a984a3dda0f28cccc8..0c6f90c9cfd14e7ba584c3828dd01077171ca420 100644
--- a/porting/liteos_a/kernel/src/math/fma.c
+++ b/porting/liteos_a/kernel/src/math/fma.c
@@ -69,7 +69,7 @@ double fma(double x, double y, double z)
 	if (d > 0) {
 		if (d < 64) {
 			zlo = nz.m<<d;
-			zhi = nz.m>>(64-d);
+			zhi = nz.m>>64-d;
 		} else {
 			zlo = 0;
 			zhi = nz.m;
@@ -77,7 +77,7 @@ double fma(double x, double y, double z)
 			d -= 64;
 			if (d == 0) {
 			} else if (d < 64) {
-				rlo = rhi<<(64-d) | rlo>>d | !!(rlo<<(64-d));
+				rlo = rhi<<64-d | rlo>>d | !!(rlo<<64-d);
 				rhi = rhi>>d;
 			} else {
 				rlo = 1;
@@ -90,7 +90,7 @@ double fma(double x, double y, double z)
 		if (d == 0) {
 			zlo = nz.m;
 		} else if (d < 64) {
-			zlo = nz.m>>d | !!(nz.m<<(64-d));
+			zlo = nz.m>>d | !!(nz.m<<64-d);
 		} else {
 			zlo = 1;
 		}
@@ -122,7 +122,7 @@ double fma(double x, double y, double z)
 		e += 64;
 		d = a_clz_64(rhi)-1;
 		/* note: d > 0 */
-		rhi = rhi<<d | rlo>>(64-d) | !!(rlo<<d);
+		rhi = rhi<<d | rlo>>64-d | !!(rlo<<d);
 	} else if (rlo) {
 		d = a_clz_64(rlo)-1;
 		if (d < 0)
@@ -173,7 +173,7 @@ double fma(double x, double y, double z)
 		} else {
 			/* only round once when scaled */
 			d = 10;
-			i = ( rhi>>d | !!(rhi<<(64-d)) ) << d;
+			i = ( rhi>>d | !!(rhi<<64-d) ) << d;
 			if (sign)
 				i = -i;
 			r = i;
diff --git a/porting/liteos_a/kernel/src/math/lgammaf_r.c b/porting/liteos_a/kernel/src/math/lgammaf_r.c
index 8dae675a72ca3cd24178097bf1e3ef91d212823e..3f353f19b339f03cdbd022d24fc69284b9b2c3f7 100644
--- a/porting/liteos_a/kernel/src/math/lgammaf_r.c
+++ b/porting/liteos_a/kernel/src/math/lgammaf_r.c
@@ -105,8 +105,7 @@ static float sin_pi(float x)
 float __lgammaf_r(float x, int *signgamp)
 {
 	union {float f; uint32_t i;} u = {x};
-	float nadj = 0;
-	float t,y,z,p,p1,p2,p3,q,r,w;
+	float t,y,z,nadj,p,p1,p2,p3,q,r,w;
 	uint32_t ix;
 	int i,sign;
 
diff --git a/porting/liteos_a/kernel/src/multibyte/mbtowc.c b/porting/liteos_a/kernel/src/multibyte/mbtowc.c
index 87fb5ba3e2ebfdc9395d858132462f517a5a0a61..c191bb038bbfdb05a81daf64c732de3b43b40424 100644
--- a/porting/liteos_a/kernel/src/multibyte/mbtowc.c
+++ b/porting/liteos_a/kernel/src/multibyte/mbtowc.c
@@ -24,21 +24,21 @@ int mbtowc(wchar_t *restrict wc, const char *restrict src, size_t n)
 	if (n<4 && ((c<<(6*n-6)) & (1U<<31))) goto ilseq;
 
 	if (OOB(c,*s)) goto ilseq;
-	c = (c<<6) | (*s++-0x80);
+	c = c<<6 | *s++-0x80;
 	if (!(c&(1U<<31))) {
 		*wc = c;
 		return 2;
 	}
 
 	if (*s-0x80u >= 0x40) goto ilseq;
-	c = (c<<6) | (*s++-0x80);
+	c = c<<6 | *s++-0x80;
 	if (!(c&(1U<<31))) {
 		*wc = c;
 		return 3;
 	}
 
 	if (*s-0x80u >= 0x40) goto ilseq;
-	*wc = (c<<6) | (*s++-0x80);
+	*wc = c<<6 | *s++-0x80;
 	return 4;
 
 ilseq:
diff --git a/porting/liteos_a/kernel/src/prng/rand.c b/porting/liteos_a/kernel/src/prng/rand.c
deleted file mode 100644
index 65ad238435cc1f73ac06411b8b499921b68fd0c8..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/prng/rand.c
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <stdlib.h>
-#include <stdint.h>
-
-void srand(unsigned s)
-{
-    return srandom(s);
-}
-
-int rand(void)
-{
-   return random();
-}
diff --git a/porting/liteos_a/kernel/src/sched/sched_yield.c b/porting/liteos_a/kernel/src/sched/sched_yield.c
deleted file mode 100644
index c511cfdfae1722b1e064ffa894d16b83875c1688..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/sched/sched_yield.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <sched.h>
-#include "los_process.h"
-
-int sched_yield()
-{
-    (void)LOS_TaskYield();
-    return 0;
-}
diff --git a/porting/liteos_a/kernel/src/stdio/__stdio_close.c b/porting/liteos_a/kernel/src/stdio/__stdio_close.c
index 9b4f24615efdf29f08150c5c3528ac0df7590515..14858bbfd7f0310652080dcbcc6638d3dcb083c4 100644
--- a/porting/liteos_a/kernel/src/stdio/__stdio_close.c
+++ b/porting/liteos_a/kernel/src/stdio/__stdio_close.c
@@ -1,9 +1,6 @@
 #include "stdio_impl.h"
 #include <unistd.h>
 
-#ifndef LOSCFG_FS_VFS
-#define close(...) (-1)
-#endif
 
 int __stdio_close(FILE *f)
 {
diff --git a/porting/liteos_a/kernel/src/stdio/__stdio_seek.c b/porting/liteos_a/kernel/src/stdio/__stdio_seek.c
index b16b17bd75d48e5da21ecce9de76cab57abd9228..70b856b0bae7e552e9b5e49ef48c0c3c3f7df2f3 100644
--- a/porting/liteos_a/kernel/src/stdio/__stdio_seek.c
+++ b/porting/liteos_a/kernel/src/stdio/__stdio_seek.c
@@ -1,62 +1,8 @@
 #include "stdio_impl.h"
 #include <unistd.h>
-#include <sys/types.h>
-#include <dirent.h>
-#ifdef LOSCFG_FS_VFS
-#include <fs/fs.h>
-
-static off64_t __stdio_lseek64(int fd, int offsetHigh, int offsetLow, off64_t *result, int whence)
-{
-    off64_t ret;
-    struct file *filep = NULL;
-    off64_t offset = ((off64_t)offsetHigh << 32) + (uint)offsetLow; /* 32: offsetHigh is high 32 bits */
-
-    /* Get the file structure corresponding to the file descriptor. */
-    ret = fs_getfilep(fd, &filep);
-    if (ret < 0) {
-        /* The errno value has already been set */
-        return (off64_t)-get_errno();
-    }
-
-    /* libc seekdir function should set the whence to SEEK_SET, so we can discard
-     * the whence argument here */
-    if (filep->f_oflags & O_DIRECTORY) {
-        /* defensive coding */
-        if (filep->f_dir == NULL) {
-            return (off64_t)-EINVAL;
-        }
-        if (offsetLow == 0) {
-            rewinddir(filep->f_dir);
-        } else {
-            seekdir(filep->f_dir, offsetLow);
-        }
-        ret = telldir(filep->f_dir);
-        if (ret < 0) {
-            return (off64_t)-get_errno();
-        }
-        goto out;
-    }
-
-    /* Then let file_seek do the real work */
-    ret = file_seek64(filep, offset, whence);
-    if (ret < 0) {
-        return (off64_t)-get_errno();
-    }
-
-out:
-    *result = ret;
-
-    return 0;
-}
 
 off_t __stdio_seek(FILE *f, off_t off, int whence)
 {
     off_t result = 0;
-    return __stdio_lseek64(f->fd, off>>32, off, &result, whence) ? -1 : result;
-}
-#else
-off_t __stdio_seek(FILE *f, off_t off, int whence)
-{
-    return 0;
+    return _lseek64(f->fd, off>>32, off, &result, whence) ? -1 : result;
 }
-#endif
diff --git a/porting/liteos_a/kernel/src/stdio/__stdio_write.c b/porting/liteos_a/kernel/src/stdio/__stdio_write.c
index e03d3fd446fca01433f0caa22f7ad654d20777fb..94158cb87cc4d29022e08135f1251f244032750c 100644
--- a/porting/liteos_a/kernel/src/stdio/__stdio_write.c
+++ b/porting/liteos_a/kernel/src/stdio/__stdio_write.c
@@ -1,10 +1,6 @@
 #include "stdio_impl.h"
 #include <sys/uio.h>
 
-#ifndef LOSCFG_FS_VFS
-#define writev(...) (-1)
-#endif
-
 size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
 {
 	struct iovec iovs[2] = {
diff --git a/porting/liteos_a/kernel/src/stdio/__stdout_write.c b/porting/liteos_a/kernel/src/stdio/__stdout_write.c
index 1cec32de61efde071cd1fa3bc092fa765ac968cb..4762696285d547671a37f09e67cdf034e5640d5e 100644
--- a/porting/liteos_a/kernel/src/stdio/__stdout_write.c
+++ b/porting/liteos_a/kernel/src/stdio/__stdout_write.c
@@ -1,19 +1,11 @@
 #include "stdio_impl.h"
 #include <sys/ioctl.h>
 
-#ifndef LOSCFG_FS_VFS
-static int _ioctl (int fd, int cmd, ...)
-{
-    return -1;
-}
-#define ioctl _ioctl
-#endif
-
 size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
 {
-    struct winsize wsz;
-    if (!(f->flags & F_SVB) && ioctl(f->fd, TIOCGWINSZ, &wsz)) {
-        f->lbf = EOF;
-    }
-    return __stdio_write(f, buf, len);
+	struct winsize wsz;
+	f->write = __stdio_write;
+	if (!(f->flags & F_SVB) && ioctl(f->fd, TIOCGWINSZ, &wsz))
+		f->lbf = EOF;
+	return __stdio_write(f, buf, len);
 }
diff --git a/porting/liteos_a/kernel/src/stdio/__toread.c b/porting/liteos_a/kernel/src/stdio/__toread.c
index d2a377e09a1750a4d8b788552c68f6daf686b350..f142ff09c087ef5459a29acd004fd005ddfc8a0c 100644
--- a/porting/liteos_a/kernel/src/stdio/__toread.c
+++ b/porting/liteos_a/kernel/src/stdio/__toread.c
@@ -11,4 +11,9 @@ int __toread(FILE *f)
 	}
 	f->rpos = f->rend = f->buf + f->buf_size;
 	return (f->flags & F_EOF) ? EOF : 0;
-}
\ No newline at end of file
+}
+
+hidden void __toread_needs_stdio_exit()
+{
+	__stdio_exit_needed();
+}
diff --git a/porting/liteos_a/kernel/src/stdio/__towrite.c b/porting/liteos_a/kernel/src/stdio/__towrite.c
index 5bb97f31459dd8a2df2cd1dd98d0ac3d3b9d43a0..4c9c66ae79c9e8c5abe8750df8ebfce149b1e061 100644
--- a/porting/liteos_a/kernel/src/stdio/__towrite.c
+++ b/porting/liteos_a/kernel/src/stdio/__towrite.c
@@ -16,3 +16,8 @@ int __towrite(FILE *f)
 
 	return 0;
 }
+
+hidden void __towrite_needs_stdio_exit()
+{
+	__stdio_exit_needed();
+}
diff --git a/porting/liteos_a/kernel/src/stdio/fclose.c b/porting/liteos_a/kernel/src/stdio/fclose.c
index c53f3cd6e6b7fa621b684f64e70f464a75aec671..f4005d5f5076dfaffa8317b6b82251faa536ff45 100644
--- a/porting/liteos_a/kernel/src/stdio/fclose.c
+++ b/porting/liteos_a/kernel/src/stdio/fclose.c
@@ -1,17 +1,11 @@
 #include "stdio_impl.h"
 #include <stdlib.h>
-#ifdef LOSCFG_LLTSER
-#include "gcov_ser.h"
-#endif
 
 static void dummy(FILE *f) { }
 weak_alias(dummy, __unlist_locked_file);
 
 int fclose(FILE *f)
 {
-#ifdef LOSCFG_LLTSER
-	GCOV_FCLOSE(fp);
-#endif
 	int r;
 	
 	FLOCK(f);
diff --git a/porting/liteos_a/kernel/src/stdio/fopen.c b/porting/liteos_a/kernel/src/stdio/fopen.c
index 37d91130f476b49d783b3fc4c21dc73bcb2f0190..e29336fde7da5f4f85b7cbe74302fa3e189ccab3 100644
--- a/porting/liteos_a/kernel/src/stdio/fopen.c
+++ b/porting/liteos_a/kernel/src/stdio/fopen.c
@@ -4,15 +4,9 @@
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
-#ifdef LOSCFG_LLTSER
-#include "gcov_ser.h"
-#endif
 
 FILE *fopen(const char *restrict filename, const char *restrict mode)
 {
-#ifdef LOSCFG_LLTSER
-	GCOV_FOPEN(filename);
-#endif
 	FILE *f;
 	int fd;
 	int flags;
diff --git a/porting/liteos_a/kernel/src/stdio/fread.c b/porting/liteos_a/kernel/src/stdio/fread.c
index 5d3b869ef9f918cde3a3e0a889151b46f78609a1..a2116da61370bd829c634353ad6f6fa6732d0d8b 100644
--- a/porting/liteos_a/kernel/src/stdio/fread.c
+++ b/porting/liteos_a/kernel/src/stdio/fread.c
@@ -1,8 +1,5 @@
 #include "stdio_impl.h"
 #include <string.h>
-#ifdef LOSCFG_LLTSER
-#include "gcov_ser.h"
-#endif
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
@@ -13,9 +10,7 @@ size_t fread(void *restrict destv, size_t size, size_t nmemb, FILE *restrict f)
 	if (!size) nmemb = 0;
 
 	FLOCK(f);
-#ifdef LOSCFG_LLTSER
-	GCOV_FREAD(f, destv, size, nmemb);
-#endif
+
 	f->mode |= f->mode-1;
 
 	if (f->rpos != f->rend) {
diff --git a/porting/liteos_a/kernel/src/stdio/fwrite.c b/porting/liteos_a/kernel/src/stdio/fwrite.c
index a7cd0aa2ca9764e1d0fe75b72408c9801becd820..7a567b2c55a94b30288444bd93f6fc48fff7e433 100644
--- a/porting/liteos_a/kernel/src/stdio/fwrite.c
+++ b/porting/liteos_a/kernel/src/stdio/fwrite.c
@@ -1,8 +1,5 @@
 #include "stdio_impl.h"
 #include <string.h>
-#ifdef LOSCFG_LLTSER
-#include "gcov_ser.h"
-#endif
 
 size_t __fwritex(const unsigned char *restrict s, size_t l, FILE *restrict f)
 {
@@ -30,9 +27,6 @@ size_t __fwritex(const unsigned char *restrict s, size_t l, FILE *restrict f)
 
 size_t fwrite(const void *restrict src, size_t size, size_t nmemb, FILE *restrict f)
 {
-#ifdef LOSCFG_LLTSER
-	GCOV_FWRITE(f, src, size, nmemb);
-#endif
 	size_t k, l = size*nmemb;
 	if (!size) nmemb = 0;
 	FLOCK(f);
diff --git a/porting/liteos_a/kernel/src/stdio/ungetc.c b/porting/liteos_a/kernel/src/stdio/ungetc.c
index 180673a47663ad57b11d3e6525c35cc23858939a..bc629d4ca511f812976abb93224e2732e0788e6e 100644
--- a/porting/liteos_a/kernel/src/stdio/ungetc.c
+++ b/porting/liteos_a/kernel/src/stdio/ungetc.c
@@ -16,5 +16,5 @@ int ungetc(int c, FILE *f)
 	f->flags &= ~F_EOF;
 
 	FUNLOCK(f);
-	return c;
+	return (unsigned char)c;
 }
diff --git a/porting/liteos_a/kernel/src/stdio/vfprintf.c b/porting/liteos_a/kernel/src/stdio/vfprintf.c
index a5bcee8a14614a40ed51eb1f9ff00c250836ac9f..8ca639ccb1affb04eaaf9603b240a023083620ac 100644
--- a/porting/liteos_a/kernel/src/stdio/vfprintf.c
+++ b/porting/liteos_a/kernel/src/stdio/vfprintf.c
@@ -20,12 +20,12 @@
 /* Convenient bit representation for modifier flags, which all fall
  * within 31 codepoints of the space character. */
 
-#define ALT_FORM   (1U<<('#'-' '))
-#define ZERO_PAD   (1U<<('0'-' '))
-#define LEFT_ADJ   (1U<<('-'-' '))
-#define PAD_POS    (1U<<(' '-' '))
-#define MARK_POS   (1U<<('+'-' '))
-#define GROUPED    (1U<<('\''-' '))
+#define ALT_FORM   (1U<<'#'-' ')
+#define ZERO_PAD   (1U<<'0'-' ')
+#define LEFT_ADJ   (1U<<'-'-' ')
+#define PAD_POS    (1U<<' '-' ')
+#define MARK_POS   (1U<<'+'-' ')
+#define GROUPED    (1U<<'\''-' ')
 
 #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
 
@@ -191,8 +191,7 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 	char buf[9+LDBL_MANT_DIG/4], *s;
 	const char *prefix="-0X+0X 0X-0x+0x 0x";
 	int pl;
-	char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)];
-	char *estr = NULL;
+	char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)], *estr;
 
 	pl=1;
 	if (signbit(y)) {
@@ -297,7 +296,7 @@ static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 		uint32_t carry=0, *b;
 		int sh=MIN(9,-e2), need=1+(p+LDBL_MANT_DIG/3U+8)/9;
 		for (d=a; d<z; d++) {
-			uint32_t rm = *d & ((1<<sh)-1);
+			uint32_t rm = *d & (1<<sh)-1;
 			*d = (*d>>sh) + carry;
 			carry = (1000000000>>sh) * rm;
 		}
@@ -486,8 +485,8 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
 		}
 
 		/* Read modifier flags */
-		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<(*s-' '))); s++)
-			fl |= 1U<<(*s-' ');
+		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
+			fl |= 1U<<*s-' ';
 
 		/* Read field width */
 		if (*s=='*') {
diff --git a/porting/liteos_a/kernel/src/stdlib/strtol.c b/porting/liteos_a/kernel/src/stdlib/strtol.c
index 8dfc1386232d925c192b1be8d841cfa48e0f1677..bfefea69d1c4f8cd8d4abb3dfa7c323f7d3c646f 100644
--- a/porting/liteos_a/kernel/src/stdlib/strtol.c
+++ b/porting/liteos_a/kernel/src/stdlib/strtol.c
@@ -53,4 +53,4 @@ weak_alias(strtoul, __strtoul_internal);
 weak_alias(strtoll, __strtoll_internal);
 weak_alias(strtoull, __strtoull_internal);
 weak_alias(strtoimax, __strtoimax_internal);
-weak_alias(strtoumax, __strtoumax_internal);
\ No newline at end of file
+weak_alias(strtoumax, __strtoumax_internal);
diff --git a/porting/liteos_a/kernel/src/string/memchr.c b/porting/liteos_a/kernel/src/string/memchr.c
index 6f3233b43e56804f428a543cbce1bbb4d8aac1e8..65f0d789b2c9a4e2bf8fbd89e9cbc704dd7a538f 100644
--- a/porting/liteos_a/kernel/src/string/memchr.c
+++ b/porting/liteos_a/kernel/src/string/memchr.c
@@ -6,7 +6,7 @@
 #define ALIGN (sizeof(size_t)-1)
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 void *memchr(const void *src, int c, size_t n)
 {
@@ -18,7 +18,7 @@ void *memchr(const void *src, int c, size_t n)
 		typedef size_t __attribute__((__may_alias__)) word;
 		const word *w;
 		size_t k = ONES * c;
-		for (w = (const void *)s; (n>=SS) && !HASZERO(*w^k); w++, n-=SS);
+		for (w = (const void *)s; n>=SS && !HASZERO(*w^k); w++, n-=SS);
 		s = (const void *)w;
 	}
 #endif
diff --git a/porting/liteos_a/kernel/src/string/stpcpy.c b/porting/liteos_a/kernel/src/string/stpcpy.c
index 81ec14b80c6d48d4e2ca51200904902b6f557b04..4db46a9e50b2f53278a22b91bebea08fc7544f6b 100644
--- a/porting/liteos_a/kernel/src/string/stpcpy.c
+++ b/porting/liteos_a/kernel/src/string/stpcpy.c
@@ -5,7 +5,7 @@
 #define ALIGN (sizeof(size_t))
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 char *__stpcpy(char *restrict d, const char *restrict s)
 {
diff --git a/porting/liteos_a/kernel/src/string/stpncpy.c b/porting/liteos_a/kernel/src/string/stpncpy.c
index fad9372e770a094f4808022b3f33af55f8abec48..f57fa6b71bf3d2479a3eeff24fba5225e3007c18 100644
--- a/porting/liteos_a/kernel/src/string/stpncpy.c
+++ b/porting/liteos_a/kernel/src/string/stpncpy.c
@@ -5,7 +5,7 @@
 #define ALIGN (sizeof(size_t)-1)
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 char *__stpncpy(char *restrict d, const char *restrict s, size_t n)
 {
@@ -17,7 +17,7 @@ char *__stpncpy(char *restrict d, const char *restrict s, size_t n)
 		for (; ((uintptr_t)s & ALIGN) && n && (*d=*s); n--, s++, d++);
 		if (!n || !*s) goto tail;
 		wd=(void *)d; ws=(const void *)s;
-		for (; (n>=sizeof(size_t)) && !HASZERO(*ws);
+		for (; n>=sizeof(size_t) && !HASZERO(*ws);
 		       n-=sizeof(size_t), ws++, wd++) *wd = *ws;
 		d=(void *)wd; s=(const void *)ws;
 	}
@@ -29,3 +29,4 @@ tail:
 }
 
 weak_alias(__stpncpy, stpncpy);
+
diff --git a/porting/liteos_a/kernel/src/string/strchrnul.c b/porting/liteos_a/kernel/src/string/strchrnul.c
index f628f869b0a4307019092ac1cdf655910d1d6539..39e2635b3064df1e2b15cb45d60c654238ad8f79 100644
--- a/porting/liteos_a/kernel/src/string/strchrnul.c
+++ b/porting/liteos_a/kernel/src/string/strchrnul.c
@@ -5,7 +5,7 @@
 #define ALIGN (sizeof(size_t))
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 char *__strchrnul(const char *s, int c)
 {
diff --git a/porting/liteos_a/kernel/src/string/strlcpy.c b/porting/liteos_a/kernel/src/string/strlcpy.c
index 4785d10192501fb450db558332b0679149e64a08..ffa0b0b01458041a91f50d0d2c09f7ff2a8e828d 100644
--- a/porting/liteos_a/kernel/src/string/strlcpy.c
+++ b/porting/liteos_a/kernel/src/string/strlcpy.c
@@ -6,7 +6,7 @@
 #define ALIGN (sizeof(size_t)-1)
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 size_t strlcpy(char *d, const char *s, size_t n)
 {
diff --git a/porting/liteos_a/kernel/src/string/strlen.c b/porting/liteos_a/kernel/src/string/strlen.c
index 66f818367779321aee7e965d964ea132750691fe..309990f029f0c09b4c7c0405258b92ac8f93310d 100644
--- a/porting/liteos_a/kernel/src/string/strlen.c
+++ b/porting/liteos_a/kernel/src/string/strlen.c
@@ -5,7 +5,7 @@
 #define ALIGN (sizeof(size_t))
 #define ONES ((size_t)-1/UCHAR_MAX)
 #define HIGHS (ONES * (UCHAR_MAX/2+1))
-#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS)
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
 
 size_t strlen(const char *s)
 {
diff --git a/porting/liteos_a/kernel/src/time/__tz.c b/porting/liteos_a/kernel/src/time/__tz.c
index cbef265f81a53604247ba5e2d2c362b4ae3b5976..58a33fbd610f010a897843fbaad50950925ca060 100644
--- a/porting/liteos_a/kernel/src/time/__tz.c
+++ b/porting/liteos_a/kernel/src/time/__tz.c
@@ -219,7 +219,7 @@ weak_alias(__tzset, tzset);
 
 const char *__tm_to_tzname(const struct tm *tm)
 {
-	const void *p = tm->tm_zone;
+	const void *p = tm->__tm_zone;
 	LOCK();
 	do_tzset();
 	if (p != __utc && p != __tzname[0] && p != __tzname[1] &&
diff --git a/porting/liteos_a/kernel/src/time/strftime.c b/porting/liteos_a/kernel/src/time/strftime.c
index 74d1ff40ee9788208a25736157a0aff66df203de..cc53d5369ca717900ef5816ed7bdc400d149dc6b 100644
--- a/porting/liteos_a/kernel/src/time/strftime.c
+++ b/porting/liteos_a/kernel/src/time/strftime.c
@@ -278,4 +278,4 @@ size_t strftime(char *restrict s, size_t n, const char *restrict f, const struct
 	return __strftime_l(s, n, f, tm, CURRENT_LOCALE);
 }
 
-weak_alias(__strftime_l, strftime_l);
\ No newline at end of file
+weak_alias(__strftime_l, strftime_l);
diff --git a/porting/liteos_a/kernel/src/time/time.c b/porting/liteos_a/kernel/src/time/time.c
deleted file mode 100644
index dcf19c7d5aa204b278f76fee1bbe9cd65adb489d..0000000000000000000000000000000000000000
--- a/porting/liteos_a/kernel/src/time/time.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "los_typedef.h"
-#include <time.h>
-#include <sys/time.h>
-
-time_t time(time_t *t)
-{
-    struct timeval tp;
-    int ret;
-
-    /* Get the current time from the system */
-    ret = gettimeofday(&tp, (struct timezone *)NULL);
-    if (ret == LOS_OK) {
-        /* Return the seconds since the epoch */
-        if (t) {
-            *t = tp.tv_sec;
-        }
-        return tp.tv_sec;
-    }
-    return (time_t)OS_ERROR;
-}