diff --git a/porting/liteos_a/user/src/locale/langinfo.c b/porting/liteos_a/user/src/locale/langinfo.c
deleted file mode 100644
index db10108ed09e07973caadf53d20a7b12899e88d1..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/locale/langinfo.c
+++ /dev/null
@@ -1,77 +0,0 @@
-#include <locale.h>
-#include <langinfo.h>
-#include <unsupported_api.h>
-#include "locale_impl.h"
-
-static const char c_time[] =
-	"Sun\0" "Mon\0" "Tue\0" "Wed\0" "Thu\0" "Fri\0" "Sat\0"
-	"Sunday\0" "Monday\0" "Tuesday\0" "Wednesday\0"
-	"Thursday\0" "Friday\0" "Saturday\0"
-	"Jan\0" "Feb\0" "Mar\0" "Apr\0" "May\0" "Jun\0"
-	"Jul\0" "Aug\0" "Sep\0" "Oct\0" "Nov\0" "Dec\0"
-	"January\0"   "February\0" "March\0"    "April\0"
-	"May\0"       "June\0"     "July\0"     "August\0"
-	"September\0" "October\0"  "November\0" "December\0"
-	"AM\0" "PM\0"
-	"%a %b %e %T %Y\0"
-	"%m/%d/%y\0"
-	"%H:%M:%S\0"
-	"%I:%M:%S %p\0"
-	"\0"
-	"\0"
-	"%m/%d/%y\0"
-	"0123456789\0"
-	"%a %b %e %T %Y\0"
-	"%H:%M:%S";
-
-static const char c_messages[] = "^[yY]\0" "^[nN]\0" "yes\0" "no";
-static const char c_numeric[] = ".\0" "";
-
-char *__nl_langinfo_l(nl_item item, locale_t loc)
-{
-	int cat = item >> 16;
-	int idx = item & 65535;
-	const char *str;
-
-	unsupported_api(__FUNCTION__);
-
-	if (item == CODESET) return loc->cat[LC_CTYPE] ? "UTF-8" : "ASCII";
-
-	/* _NL_LOCALE_NAME extension */
-	if (idx == 65535 && cat < LC_ALL)
-		return loc->cat[cat] ? (char *)loc->cat[cat]->name : "C";
-	
-	switch (cat) {
-	case LC_NUMERIC:
-		if (idx > 1) return "";
-		str = c_numeric;
-		break;
-	case LC_TIME:
-		if (idx > 0x31) return "";
-		str = c_time;
-		break;
-	case LC_MONETARY:
-		if (idx > 0) return "";
-		str = "";
-		break;
-	case LC_MESSAGES:
-		if (idx > 3) return "";
-		str = c_messages;
-		break;
-	default:
-		return "";
-	}
-
-	for (; idx; idx--, str++) for (; *str; str++);
-	if (cat != LC_NUMERIC && *str) str = LCTRANS(str, cat, loc);
-	return (char *)str;
-}
-
-char *__nl_langinfo(nl_item item)
-{
-	unsupported_api(__FUNCTION__);
-	return __nl_langinfo_l(item, CURRENT_LOCALE);
-}
-
-weak_alias(__nl_langinfo, nl_langinfo);
-weak_alias(__nl_langinfo_l, nl_langinfo_l);
diff --git a/porting/liteos_a/user/src/misc/mntent.c b/porting/liteos_a/user/src/misc/mntent.c
deleted file mode 100644
index 2ddaaeed3707b0e3e8068e617540b49ddab2de2a..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/misc/mntent.c
+++ /dev/null
@@ -1,83 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <mntent.h>
-#include <errno.h>
-#include <unsupported_api.h>
-
-static char *internal_buf;
-static size_t internal_bufsize;
-
-#define SENTINEL (char *)&internal_buf
-
-FILE *setmntent(const char *name, const char *mode)
-{
-	unsupported_api(__FUNCTION__);
-	return fopen(name, mode);
-}
-
-int endmntent(FILE *f)
-{
-	if (f) fclose(f);
-	return 1;
-}
-
-struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
-{
-	int cnt, n[8], use_internal = (linebuf == SENTINEL);
-
-	mnt->mnt_freq = 0;
-	mnt->mnt_passno = 0;
-
-	unsupported_api(__FUNCTION__);
-	do {
-		if (use_internal) {
-			getline(&internal_buf, &internal_bufsize, f);
-			linebuf = internal_buf;
-		} else {
-			fgets(linebuf, buflen, f);
-		}
-		if (feof(f) || ferror(f)) return 0;
-		if (!strchr(linebuf, '\n')) {
-			fscanf(f, "%*[^\n]%*[\n]");
-			errno = ERANGE;
-			return 0;
-		}
-		cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
-			n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
-			&mnt->mnt_freq, &mnt->mnt_passno);
-	} while (cnt < 2 || linebuf[n[0]] == '#');
-
-	linebuf[n[1]] = 0;
-	linebuf[n[3]] = 0;
-	linebuf[n[5]] = 0;
-	linebuf[n[7]] = 0;
-
-	mnt->mnt_fsname = linebuf+n[0];
-	mnt->mnt_dir = linebuf+n[2];
-	mnt->mnt_type = linebuf+n[4];
-	mnt->mnt_opts = linebuf+n[6];
-
-	return mnt;
-}
-
-struct mntent *getmntent(FILE *f)
-{
-	static struct mntent mnt;
-	unsupported_api(__FUNCTION__);
-	return getmntent_r(f, &mnt, SENTINEL, 0);
-}
-
-int addmntent(FILE *f, const struct mntent *mnt)
-{
-	unsupported_api(__FUNCTION__);
-	if (fseek(f, 0, SEEK_END)) return 1;
-	return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
-		mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
-		mnt->mnt_freq, mnt->mnt_passno) < 0;
-}
-
-char *hasmntopt(const struct mntent *mnt, const char *opt)
-{
-	unsupported_api(__FUNCTION__);
-	return strstr(mnt->mnt_opts, opt);
-}
diff --git a/porting/liteos_a/user/src/network/gai_strerror.c b/porting/liteos_a/user/src/network/gai_strerror.c
deleted file mode 100644
index 1415e9769b87c0a4a51b3f70384f33a64b6bb7cc..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/network/gai_strerror.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include <netdb.h>
-#include <unsupported_api.h>
-#include "locale_impl.h"
-
-static const char msgs[] =
-	"Invalid flags\0"
-	"Name does not resolve\0"
-	"Try again\0"
-	"Non-recoverable error\0"
-	"Unknown error\0"
-	"Unrecognized address family or invalid length\0"
-	"Unrecognized socket type\0"
-	"Unrecognized service\0"
-	"Unknown error\0"
-	"Out of memory\0"
-	"System error\0"
-	"Overflow\0"
-	"\0Unknown error";
-
-const char *gai_strerror(int ecode)
-{
-	const char *s;
-	unsupported_api(__FUNCTION__);
-	for (s=msgs, ecode++; ecode && *s; ecode++, s++) for (; *s; s++);
-	if (!*s) s++;
-	return LCTRANS_CUR(s);
-}
diff --git a/porting/liteos_a/user/src/network/getaddrinfo.c b/porting/liteos_a/user/src/network/getaddrinfo.c
deleted file mode 100644
index 97452d0c353eb5a5c5ffb889b28332d9e12b1a41..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/network/getaddrinfo.c
+++ /dev/null
@@ -1,138 +0,0 @@
-#include <stdlib.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <netdb.h>
-#include <string.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <endian.h>
-#include <errno.h>
-#include <unsupported_api.h>
-#include "lookup.h"
-
-int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
-{
-	struct service ports[MAXSERVS];
-	struct address addrs[MAXADDRS];
-	char canon[256], *outcanon;
-	int nservs, naddrs, nais, canon_len, i, j, k;
-	int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
-	struct aibuf *out;
-
-	unsupported_api(__FUNCTION__);
-
-	if (!host && !serv) return EAI_NONAME;
-
-	if (hint) {
-		family = hint->ai_family;
-		flags = hint->ai_flags;
-		proto = hint->ai_protocol;
-		socktype = hint->ai_socktype;
-
-		const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
-			AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
-		if ((flags & mask) != flags)
-			return EAI_BADFLAGS;
-
-		switch (family) {
-		case AF_INET:
-		case AF_INET6:
-		case AF_UNSPEC:
-			break;
-		default:
-			return EAI_FAMILY;
-		}
-	}
-
-	if (flags & AI_ADDRCONFIG) {
-		/* Define the "an address is configured" condition for address
-		 * families via ability to create a socket for the family plus
-		 * routability of the loopback address for the family. */
-		static const struct sockaddr_in lo4 = {
-			.sin_family = AF_INET, .sin_port = 65535,
-			.sin_addr.s_addr = __BYTE_ORDER == __BIG_ENDIAN
-				? 0x7f000001 : 0x0100007f
-		};
-		static const struct sockaddr_in6 lo6 = {
-			.sin6_family = AF_INET6, .sin6_port = 65535,
-			.sin6_addr = IN6ADDR_LOOPBACK_INIT
-		};
-		int tf[2] = { AF_INET, AF_INET6 };
-		const void *ta[2] = { &lo4, &lo6 };
-		socklen_t tl[2] = { sizeof lo4, sizeof lo6 };
-		for (i=0; i<2; i++) {
-			if (family==tf[1-i]) continue;
-			int s = socket(tf[i], SOCK_CLOEXEC|SOCK_DGRAM,
-				IPPROTO_UDP);
-			if (s>=0) {
-				int cs;
-				pthread_setcancelstate(
-					PTHREAD_CANCEL_DISABLE, &cs);
-				int r = connect(s, ta[i], tl[i]);
-				pthread_setcancelstate(cs, 0);
-				close(s);
-				if (!r) continue;
-			}
-			switch (errno) {
-			case EADDRNOTAVAIL:
-			case EAFNOSUPPORT:
-			case EHOSTUNREACH:
-			case ENETDOWN:
-			case ENETUNREACH:
-				break;
-			default:
-				return EAI_SYSTEM;
-			}
-			if (family == tf[i]) return EAI_NONAME;
-			family = tf[1-i];
-		}
-	}
-
-	nservs = __lookup_serv(ports, serv, proto, socktype, flags);
-	if (nservs < 0) return nservs;
-
-	naddrs = __lookup_name(addrs, canon, host, family, flags);
-	if (naddrs < 0) return naddrs;
-
-	nais = nservs * naddrs;
-	canon_len = strlen(canon);
-	out = calloc(1, nais * sizeof(*out) + canon_len + 1);
-	if (!out) return EAI_MEMORY;
-
-	if (canon_len) {
-		outcanon = (void *)&out[nais];
-		memcpy(outcanon, canon, canon_len+1);
-	} else {
-		outcanon = 0;
-	}
-
-	for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
-		out[k].slot = k;
-		out[k].ai = (struct addrinfo){
-			.ai_family = addrs[i].family,
-			.ai_socktype = ports[j].socktype,
-			.ai_protocol = ports[j].proto,
-			.ai_addrlen = addrs[i].family == AF_INET
-				? sizeof(struct sockaddr_in)
-				: sizeof(struct sockaddr_in6),
-			.ai_addr = (void *)&out[k].sa,
-			.ai_canonname = outcanon };
-		if (k) out[k-1].ai.ai_next = &out[k].ai;
-		switch (addrs[i].family) {
-		case AF_INET:
-			out[k].sa.sin.sin_family = AF_INET;
-			out[k].sa.sin.sin_port = htons(ports[j].port);
-			memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
-			break;
-		case AF_INET6:
-			out[k].sa.sin6.sin6_family = AF_INET6;
-			out[k].sa.sin6.sin6_port = htons(ports[j].port);
-			out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
-			memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
-			break;			
-		}
-	}
-	out[0].ref = nais;
-	*res = &out->ai;
-	return 0;
-}
diff --git a/porting/liteos_a/user/src/passwd/getgrent.c b/porting/liteos_a/user/src/passwd/getgrent.c
index c84ef5e63cd09c3a8c4de07ca41555b947ae53b6..b09b59d0282cc9d5ccfc73458952a7eccfb887c6 100644
--- a/porting/liteos_a/user/src/passwd/getgrent.c
+++ b/porting/liteos_a/user/src/passwd/getgrent.c
@@ -38,7 +38,6 @@ struct group *getgrnam(const char *name)
 {
 	struct group *res;
 	size_t size=0, nmem=0;
-	unsupported_api(__FUNCTION__);
 	__getgr_a(name, 0, &gr, &line, &size, &mem, &nmem, &res);
 	return res;
 }
diff --git a/porting/liteos_a/user/src/passwd/getpwent.c b/porting/liteos_a/user/src/passwd/getpwent.c
index 73e7a6fffa9c36b3e0266059e67812245100dd48..8412854cc15ff2f054e1822fa2a375f1640ce3f8 100644
--- a/porting/liteos_a/user/src/passwd/getpwent.c
+++ b/porting/liteos_a/user/src/passwd/getpwent.c
@@ -36,7 +36,6 @@ struct passwd *getpwuid(uid_t uid)
 struct passwd *getpwnam(const char *name)
 {
 	struct passwd *res;
-	unsupported_api(__FUNCTION__);
 	__getpw_a(name, 0, &pw, &line, &size, &res);
 	return res;
 }
diff --git a/porting/liteos_a/user/src/stat/fchmod.c b/porting/liteos_a/user/src/stat/fchmod.c
deleted file mode 100644
index 7e469a93126db42fc52cc765e4ce45cb684cc4c3..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/stat/fchmod.c
+++ /dev/null
@@ -1,22 +0,0 @@
-#include <sys/stat.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-
-int fchmod(int fd, mode_t mode)
-{
-	unsupported_api(__FUNCTION__);
-	int ret = __syscall(SYS_fchmod, fd, mode);
-	if (ret != -EBADF || __syscall(SYS_fcntl, fd, F_GETFD) < 0)
-		return __syscall_ret(ret);
-
-	char buf[15+3*sizeof(int)];
-	__procfdname(buf, fd);
-#ifdef SYS_chmod
-	return syscall(SYS_chmod, buf, mode);
-#else
-	return syscall(SYS_fchmodat, AT_FDCWD, buf, mode);
-#endif
-}
diff --git a/porting/liteos_a/user/src/stat/fchmodat.c b/porting/liteos_a/user/src/stat/fchmodat.c
deleted file mode 100644
index 2c777e1b7a2a6294df57e575beea3362536904fa..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/stat/fchmodat.c
+++ /dev/null
@@ -1,41 +0,0 @@
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-#include "kstat.h"
-
-int fchmodat(int fd, const char *path, mode_t mode, int flag)
-{
-	unsupported_api(__FUNCTION__);
-	if (!flag) return syscall(SYS_fchmodat, fd, path, mode, flag);
-
-	if (flag != AT_SYMLINK_NOFOLLOW)
-		return __syscall_ret(-EINVAL);
-
-	struct kstat st;
-	int ret, fd2;
-	char proc[15+3*sizeof(int)];
-
-	if ((ret = __syscall(SYS_fstatat, fd, path, &st, flag)))
-		return __syscall_ret(ret);
-	if (S_ISLNK(st.st_mode))
-		return __syscall_ret(-EOPNOTSUPP);
-
-	if ((fd2 = __syscall(SYS_openat, fd, path, O_RDONLY|O_PATH|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC)) < 0) {
-		if (fd2 == -ELOOP)
-			return __syscall_ret(-EOPNOTSUPP);
-		return __syscall_ret(fd2);
-	}
-
-	__procfdname(proc, fd2);
-	ret = __syscall(SYS_fstatat, AT_FDCWD, proc, &st, 0);
-	if (!ret) {
-		if (S_ISLNK(st.st_mode)) ret = -EOPNOTSUPP;
-		else ret = __syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
-	}
-
-	__syscall(SYS_close, fd2);
-	return __syscall_ret(ret);
-}
diff --git a/porting/liteos_a/user/src/stat/futimens.c b/porting/liteos_a/user/src/stat/futimens.c
deleted file mode 100644
index 2ab329a08afbaaeb86e99c83abf1240e9bf2151b..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/stat/futimens.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <sys/stat.h>
-#include <unsupported_api.h>
-
-int futimens(int fd, const struct timespec times[2])
-{
-	unsupported_api(__FUNCTION__);
-	return utimensat(fd, 0, times, 0);
-}
diff --git a/porting/liteos_a/user/src/stat/utimensat.c b/porting/liteos_a/user/src/stat/utimensat.c
deleted file mode 100644
index ed3283eb80001b228408e8e897988e69c398b220..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/stat/utimensat.c
+++ /dev/null
@@ -1,63 +0,0 @@
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-
-#define IS32BIT(x) !((x)+0x80000000ULL>>32)
-#define NS_SPECIAL(ns) ((ns)==UTIME_NOW || (ns)==UTIME_OMIT)
-
-int utimensat(int fd, const char *path, const struct timespec times[2], int flags)
-{
-	int r;
-	unsupported_api(__FUNCTION__);
-	if (times && times[0].tv_nsec==UTIME_NOW && times[1].tv_nsec==UTIME_NOW)
-		times = 0;
-#ifdef SYS_utimensat_time64
-	r = -ENOSYS;
-	time_t s0=0, s1=0;
-	long ns0=0, ns1=0;
-	if (times) {
-		ns0 = times[0].tv_nsec;
-		ns1 = times[1].tv_nsec;
-		if (!NS_SPECIAL(ns0)) s0 = times[0].tv_sec;
-		if (!NS_SPECIAL(ns1)) s1 = times[1].tv_sec;
-	}
-	if (SYS_utimensat == SYS_utimensat_time64 || !IS32BIT(s0) || !IS32BIT(s1))
-		r = __syscall(SYS_utimensat_time64, fd, path, times ?
-			((long long[]){s0, ns0, s1, ns1}) : 0, flags);
-	if (SYS_utimensat == SYS_utimensat_time64 || r!=-ENOSYS)
-		return __syscall_ret(r);
-	if (!IS32BIT(s0) || !IS32BIT(s1))
-		return __syscall_ret(-ENOTSUP);
-	r = __syscall(SYS_utimensat, fd, path,
-		times ? ((long[]){s0, ns0, s1, ns1}) : 0, flags);
-#else
-	r = __syscall(SYS_utimensat, fd, path, times, flags);
-#endif
-
-#ifdef SYS_futimesat
-	if (r != -ENOSYS || flags) return __syscall_ret(r);
-	long *tv=0, tmp[4];
-	if (times) {
-		int i;
-		tv = tmp;
-		for (i=0; i<2; i++) {
-			if (times[i].tv_nsec >= 1000000000ULL) {
-				if (NS_SPECIAL(times[i].tv_nsec))
-					return __syscall_ret(-ENOSYS);
-				return __syscall_ret(-EINVAL);
-			}
-			tmp[2*i+0] = times[i].tv_sec;
-			tmp[2*i+1] = times[i].tv_nsec / 1000;
-		}
-	}
-
-	r = __syscall(SYS_futimesat, fd, path, tv);
-	if (r != -ENOSYS || fd != AT_FDCWD) return __syscall_ret(r);
-	r = __syscall(SYS_utimes, path, tv);
-#endif
-	return __syscall_ret(r);
-}
diff --git a/porting/liteos_a/user/src/time/__tz.c b/porting/liteos_a/user/src/time/__tz.c
deleted file mode 100644
index 0ff172f9d05ce87c9b9baa7e08de30d18f4e2ebe..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/time/__tz.c
+++ /dev/null
@@ -1,424 +0,0 @@
-#include "time_impl.h"
-#include <stdint.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include "libc.h"
-#include "lock.h"
-#include <unsupported_api.h>
-
-long  __timezone = 0;
-int   __daylight = 0;
-char *__tzname[2] = { 0, 0 };
-
-weak_alias(__timezone, timezone);
-weak_alias(__daylight, daylight);
-weak_alias(__tzname, tzname);
-
-static char std_name[TZNAME_MAX+1];
-static char dst_name[TZNAME_MAX+1];
-const char __utc[] = "UTC";
-
-static int dst_off;
-static int r0[5], r1[5];
-
-static const unsigned char *zi, *trans, *index, *types, *abbrevs, *abbrevs_end;
-static size_t map_size;
-
-static char old_tz_buf[32];
-static char *old_tz = old_tz_buf;
-static size_t old_tz_size = sizeof old_tz_buf;
-
-static volatile int lock[1];
-
-static int getint(const char **p)
-{
-	unsigned x;
-	for (x=0; **p-'0'<10U; (*p)++) x = **p-'0' + 10*x;
-	return x;
-}
-
-static int getoff(const char **p)
-{
-	int neg = 0;
-	if (**p == '-') {
-		++*p;
-		neg = 1;
-	} else if (**p == '+') {
-		++*p;
-	}
-	int off = 3600*getint(p);
-	if (**p == ':') {
-		++*p;
-		off += 60*getint(p);
-		if (**p == ':') {
-			++*p;
-			off += getint(p);
-		}
-	}
-	return neg ? -off : off;
-}
-
-static void getrule(const char **p, int rule[5])
-{
-	int r = rule[0] = **p;
-
-	if (r!='M') {
-		if (r=='J') ++*p;
-		else rule[0] = 0;
-		rule[1] = getint(p);
-	} else {
-		++*p; rule[1] = getint(p);
-		++*p; rule[2] = getint(p);
-		++*p; rule[3] = getint(p);
-	}
-
-	if (**p=='/') {
-		++*p;
-		rule[4] = getoff(p);
-	} else {
-		rule[4] = 7200;
-	}
-}
-
-static void getname(char *d, const char **p)
-{
-	int i;
-	if (**p == '<') {
-		++*p;
-		for (i=0; (*p)[i]!='>' && i<TZNAME_MAX; i++)
-			d[i] = (*p)[i];
-		++*p;
-	} else {
-		for (i=0; ((*p)[i]|32)-'a'<26U && i<TZNAME_MAX; i++)
-			d[i] = (*p)[i];
-	}
-	*p += i;
-	d[i] = 0;
-}
-
-#define VEC(...) ((const unsigned char[]){__VA_ARGS__})
-
-static uint32_t zi_read32(const unsigned char *z)
-{
-	return (unsigned)z[0]<<24 | z[1]<<16 | z[2]<<8 | z[3];
-}
-
-static size_t zi_dotprod(const unsigned char *z, const unsigned char *v, size_t n)
-{
-	size_t y;
-	uint32_t x;
-	for (y=0; n; n--, z+=4, v++) {
-		x = zi_read32(z);
-		y += x * *v;
-	}
-	return y;
-}
-
-static void do_tzset()
-{
-	char buf[NAME_MAX+25], *pathname=buf+24;
-	const char *try, *s, *p;
-	const unsigned char *map = 0;
-	size_t i;
-	static const char search[] =
-		"/usr/share/zoneinfo/\0/share/zoneinfo/\0/etc/zoneinfo/\0";
-
-	s = getenv("TZ");
-	if (!s) s = "/etc/localtime";
-	if (!*s) s = __utc;
-
-	if (old_tz && !strcmp(s, old_tz)) return;
-
-	for (i=0; i<5; i++) r0[i] = r1[i] = 0;
-
-	if (zi) __munmap((void *)zi, map_size);
-
-	/* Cache the old value of TZ to check if it has changed. Avoid
-	 * free so as not to pull it into static programs. Growth
-	 * strategy makes it so free would have minimal benefit anyway. */
-	i = strlen(s);
-	if (i > PATH_MAX+1) s = __utc, i = 3;
-	if (i >= old_tz_size) {
-		old_tz_size *= 2;
-		if (i >= old_tz_size) old_tz_size = i+1;
-		if (old_tz_size > PATH_MAX+2) old_tz_size = PATH_MAX+2;
-		old_tz = malloc(old_tz_size);
-	}
-	if (old_tz) memcpy(old_tz, s, i+1);
-
-	/* Non-suid can use an absolute tzfile pathname or a relative
-	 * pathame beginning with "."; in secure mode, only the
-	 * standard path will be searched. */
-	if (*s == ':' || ((p=strchr(s, '/')) && !memchr(s, ',', p-s))) {
-		if (*s == ':') s++;
-		if (*s == '/' || *s == '.') {
-			if (!libc.secure || !strcmp(s, "/etc/localtime"))
-				map = __map_file(s, &map_size);
-		} else {
-			size_t l = strlen(s);
-			if (l <= NAME_MAX && !strchr(s, '.')) {
-				memcpy(pathname, s, l+1);
-				pathname[l] = 0;
-				for (try=search; !map && *try; try+=l+1) {
-					l = strlen(try);
-					memcpy(pathname-l, try, l);
-					map = __map_file(pathname-l, &map_size);
-				}
-			}
-		}
-		if (!map) s = __utc;
-	}
-	if (map && (map_size < 44 || memcmp(map, "TZif", 4))) {
-		__munmap((void *)map, map_size);
-		map = 0;
-		s = __utc;
-	}
-
-	zi = map;
-	if (map) {
-		int scale = 2;
-		if (sizeof(time_t) > 4 && map[4]=='2') {
-			size_t skip = zi_dotprod(zi+20, VEC(1,1,8,5,6,1), 6);
-			trans = zi+skip+44+44;
-			scale++;
-		} else {
-			trans = zi+44;
-		}
-		index = trans + (zi_read32(trans-12) << scale);
-		types = index + zi_read32(trans-12);
-		abbrevs = types + 6*zi_read32(trans-8);
-		abbrevs_end = abbrevs + zi_read32(trans-4);
-		if (zi[map_size-1] == '\n') {
-			for (s = (const char *)zi+map_size-2; *s!='\n'; s--);
-			s++;
-		} else {
-			const unsigned char *p;
-			__tzname[0] = __tzname[1] = 0;
-			__daylight = __timezone = dst_off = 0;
-			for (p=types; p<abbrevs; p+=6) {
-				if (!p[4] && !__tzname[0]) {
-					__tzname[0] = (char *)abbrevs + p[5];
-					__timezone = -zi_read32(p);
-				}
-				if (p[4] && !__tzname[1]) {
-					__tzname[1] = (char *)abbrevs + p[5];
-					dst_off = -zi_read32(p);
-					__daylight = 1;
-				}
-			}
-			if (!__tzname[0]) __tzname[0] = __tzname[1];
-			if (!__tzname[0]) __tzname[0] = (char *)__utc;
-			if (!__daylight) {
-				__tzname[1] = __tzname[0];
-				dst_off = __timezone;
-			}
-			return;
-		}
-	}
-
-	if (!s) s = __utc;
-	getname(std_name, &s);
-	__tzname[0] = std_name;
-	__timezone = getoff(&s);
-	getname(dst_name, &s);
-	__tzname[1] = dst_name;
-	if (dst_name[0]) {
-		__daylight = 1;
-		if (*s == '+' || *s=='-' || *s-'0'<10U)
-			dst_off = getoff(&s);
-		else
-			dst_off = __timezone - 3600;
-	} else {
-		__daylight = 0;
-		dst_off = __timezone;
-	}
-
-	if (*s == ',') s++, getrule(&s, r0);
-	if (*s == ',') s++, getrule(&s, r1);
-}
-
-/* Search zoneinfo rules to find the one that applies to the given time,
- * and determine alternate opposite-DST-status rule that may be needed. */
-
-static size_t scan_trans(long long t, int local, size_t *alt)
-{
-	int scale = 3 - (trans == zi+44);
-	uint64_t x;
-	int off = 0;
-
-	size_t a = 0, n = (index-trans)>>scale, m;
-
-	if (!n) {
-		if (alt) *alt = 0;
-		return 0;
-	}
-
-	/* Binary search for 'most-recent rule before t'. */
-	while (n > 1) {
-		m = a + n/2;
-		x = zi_read32(trans + (m<<scale));
-		if (scale == 3) x = x<<32 | zi_read32(trans + (m<<scale) + 4);
-		else x = (int32_t)x;
-		if (local) off = (int32_t)zi_read32(types + 6 * index[m-1]);
-		if (t - off < (int64_t)x) {
-			n /= 2;
-		} else {
-			a = m;
-			n -= n/2;
-		}
-	}
-
-	/* First and last entry are special. First means to use lowest-index
-	 * non-DST type. Last means to apply POSIX-style rule if available. */
-	n = (index-trans)>>scale;
-	if (a == n-1) return -1;
-	if (a == 0) {
-		x = zi_read32(trans + (a<<scale));
-		if (scale == 3) x = x<<32 | zi_read32(trans + (a<<scale) + 4);
-		else x = (int32_t)x;
-		if (local) off = (int32_t)zi_read32(types + 6 * index[a-1]);
-		if (t - off < (int64_t)x) {
-			for (a=0; a<(abbrevs-types)/6; a++) {
-				if (types[6*a+4] != types[4]) break;
-			}
-			if (a == (abbrevs-types)/6) a = 0;
-			if (types[6*a+4]) {
-				*alt = a;
-				return 0;
-			} else {
-				*alt = 0;
-				return a;
-			}
-		}
-	}
-
-	/* Try to find a neighboring opposite-DST-status rule. */
-	if (alt) {
-		if (a && types[6*index[a-1]+4] != types[6*index[a]+4])
-			*alt = index[a-1];
-		else if (a+1<n && types[6*index[a+1]+4] != types[6*index[a]+4])
-			*alt = index[a+1];
-		else
-			*alt = index[a];
-	}
-
-	return index[a];
-}
-
-static int days_in_month(int m, int is_leap)
-{
-	if (m==2) return 28+is_leap;
-	else return 30+((0xad5>>(m-1))&1);
-}
-
-/* Convert a POSIX DST rule plus year to seconds since epoch. */
-
-static long long rule_to_secs(const int *rule, int year)
-{
-	int is_leap;
-	long long t = __year_to_secs(year, &is_leap);
-	int x, m, n, d;
-	if (rule[0]!='M') {
-		x = rule[1];
-		if (rule[0]=='J' && (x < 60 || !is_leap)) x--;
-		t += 86400 * x;
-	} else {
-		m = rule[1];
-		n = rule[2];
-		d = rule[3];
-		t += __month_to_secs(m-1, is_leap);
-		int wday = (int)((t + 4*86400) % (7*86400)) / 86400;
-		int days = d - wday;
-		if (days < 0) days += 7;
-		if (n == 5 && days+28 >= days_in_month(m, is_leap)) n = 4;
-		t += 86400 * (days + 7*(n-1));
-	}
-	t += rule[4];
-	return t;
-}
-
-/* Determine the time zone in effect for a given time in seconds since the
- * epoch. It can be given in local or universal time. The results will
- * indicate whether DST is in effect at the queried time, and will give both
- * the GMT offset for the active zone/DST rule and the opposite DST. This
- * enables a caller to efficiently adjust for the case where an explicit
- * DST specification mismatches what would be in effect at the time. */
-
-void __secs_to_zone(long long t, int local, int *isdst, long *offset, long *oppoff, const char **zonename)
-{
-	LOCK(lock);
-
-	do_tzset();
-
-	if (zi) {
-		size_t alt, i = scan_trans(t, local, &alt);
-		if (i != -1) {
-			*isdst = types[6*i+4];
-			*offset = (int32_t)zi_read32(types+6*i);
-			*zonename = (const char *)abbrevs + types[6*i+5];
-			if (oppoff) *oppoff = (int32_t)zi_read32(types+6*alt);
-			UNLOCK(lock);
-			return;
-		}
-	}
-
-	if (!__daylight) goto std;
-
-	/* FIXME: may be broken if DST changes right at year boundary?
-	 * Also, this could be more efficient.*/
-	long long y = t / 31556952 + 70;
-	while (__year_to_secs(y, 0) > t) y--;
-	while (__year_to_secs(y+1, 0) < t) y++;
-
-	long long t0 = rule_to_secs(r0, y);
-	long long t1 = rule_to_secs(r1, y);
-
-	if (!local) {
-		t0 += __timezone;
-		t1 += dst_off;
-	}
-	if (t0 < t1) {
-		if (t >= t0 && t < t1) goto dst;
-		goto std;
-	} else {
-		if (t >= t1 && t < t0) goto std;
-		goto dst;
-	}
-std:
-	*isdst = 0;
-	*offset = -__timezone;
-	if (oppoff) *oppoff = -dst_off;
-	*zonename = __tzname[0];
-	UNLOCK(lock);
-	return;
-dst:
-	*isdst = 1;
-	*offset = -dst_off;
-	if (oppoff) *oppoff = -__timezone;
-	*zonename = __tzname[1];
-	UNLOCK(lock);
-}
-
-static void __tzset()
-{
-	unsupported_api(__FUNCTION__);
-	LOCK(lock);
-	do_tzset();
-	UNLOCK(lock);
-}
-
-weak_alias(__tzset, tzset);
-
-const char *__tm_to_tzname(const struct tm *tm)
-{
-	const void *p = tm->__tm_zone;
-	LOCK(lock);
-	do_tzset();
-	if (p != __utc && p != __tzname[0] && p != __tzname[1] &&
-	    (!zi || (uintptr_t)p-(uintptr_t)abbrevs >= abbrevs_end - abbrevs))
-		p = "";
-	UNLOCK(lock);
-	return p;
-}
diff --git a/porting/liteos_a/user/src/unistd/faccessat.c b/porting/liteos_a/user/src/unistd/faccessat.c
deleted file mode 100644
index 29e24e03ab28a6adb4d02d251845e78b9710668d..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/unistd/faccessat.c
+++ /dev/null
@@ -1,58 +0,0 @@
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-#include <unsupported_api.h>
-#include "syscall.h"
-#include "pthread_impl.h"
-
-struct ctx {
-	int fd;
-	const char *filename;
-	int amode;
-	int p;
-};
-
-static int checker(void *p)
-{
-	struct ctx *c = p;
-	int ret;
-	if (__syscall(SYS_setregid, __syscall(SYS_getegid), -1)
-	    || __syscall(SYS_setreuid, __syscall(SYS_geteuid), -1))
-		__syscall(SYS_exit, 1);
-	ret = __syscall(SYS_faccessat, c->fd, c->filename, c->amode, 0);
-	__syscall(SYS_write, c->p, &ret, sizeof ret);
-	return 0;
-}
-
-int faccessat(int fd, const char *filename, int amode, int flag)
-{
-	unsupported_api(__FUNCTION__);
-	if (!flag || (flag==AT_EACCESS && getuid()==geteuid() && getgid()==getegid()))
-		return syscall(SYS_faccessat, fd, filename, amode, flag);
-
-	if (flag != AT_EACCESS)
-		return __syscall_ret(-EINVAL);
-
-	char stack[1024];
-	sigset_t set;
-	pid_t pid;
-	int status;
-	int ret, p[2];
-
-	if (pipe2(p, O_CLOEXEC)) return __syscall_ret(-EBUSY);
-	struct ctx c = { .fd = fd, .filename = filename, .amode = amode, .p = p[1] };
-
-	__block_all_sigs(&set);
-	
-	pid = __clone(checker, stack+sizeof stack, 0, &c);
-	__syscall(SYS_close, p[1]);
-
-	if (pid<0 || __syscall(SYS_read, p[0], &ret, sizeof ret) != sizeof(ret))
-		ret = -EBUSY;
-	__syscall(SYS_close, p[0]);
-	__syscall(SYS_wait4, pid, &status, __WCLONE, 0);
-
-	__restore_sigs(&set);
-
-	return __syscall_ret(ret);
-}
diff --git a/porting/liteos_a/user/src/unistd/fchown.c b/porting/liteos_a/user/src/unistd/fchown.c
deleted file mode 100644
index 441e39cb4d681d387f5bb0470f1882f726cb0692..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/unistd/fchown.c
+++ /dev/null
@@ -1,23 +0,0 @@
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-
-int fchown(int fd, uid_t uid, gid_t gid)
-{
-	unsupported_api(__FUNCTION__);
-	int ret = __syscall(SYS_fchown, fd, uid, gid);
-	if (ret != -EBADF || __syscall(SYS_fcntl, fd, F_GETFD) < 0)
-		return __syscall_ret(ret);
-
-	char buf[15+3*sizeof(int)];
-	__procfdname(buf, fd);
-#ifdef SYS_chown
-	return syscall(SYS_chown, buf, uid, gid);
-#else
-	return syscall(SYS_fchownat, AT_FDCWD, buf, uid, gid, 0);
-#endif
-
-}
diff --git a/porting/liteos_a/user/src/unistd/fchownat.c b/porting/liteos_a/user/src/unistd/fchownat.c
deleted file mode 100644
index 88fce2c187b84c67ef14808b4535146de1d8142b..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/unistd/fchownat.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <unistd.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-
-int fchownat(int fd, const char *path, uid_t uid, gid_t gid, int flag)
-{
-	unsupported_api(__FUNCTION__);
-	return syscall(SYS_fchownat, fd, path, uid, gid, flag);
-}
diff --git a/porting/liteos_a/user/src/unistd/getsid.c b/porting/liteos_a/user/src/unistd/getsid.c
deleted file mode 100644
index ecb02e0b0259ef788331409c001aef380616d613..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/unistd/getsid.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <unistd.h>
-#include "syscall.h"
-#include <unsupported_api.h>
-
-pid_t getsid(pid_t pid)
-{
-	unsupported_api(__FUNCTION__);
-	return syscall(SYS_getsid, pid);
-}
diff --git a/porting/liteos_a/user/src/unistd/setsid.c b/porting/liteos_a/user/src/unistd/setsid.c
deleted file mode 100644
index 54e4d93479867c13674b6e3d8a75ee1fa677595a..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/unistd/setsid.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <unistd.h>
-#include <unsupported_api.h>
-
-#include "syscall.h"
-
-pid_t setsid(void)
-{
-	unsupported_api(__FUNCTION__);
-	return syscall(SYS_setsid);
-}