Original stdio read use readv as default syscall,calling vfs_read twice will
reduce I/O throughout, use syscall read instead with buffer if possible

Issue:I70LQ0
Test: libc-test, benchmark
Signed-off-by: Nrobottoy <wangyaofeng.wang@huawei.com>
Change-Id: I2e5c0298fcd665edb3228ca400ee77fbf25a298c

描述：sigchain重发信号当SIG_DFL时

Issue：https://gitee.com/openharmony/hiviewdfx_faultloggerd/issues/I6P48B
测试：运行libc-test通过
Signed-off-by: Nzengchunliang <zengchunliang3@huawei.com>

Issue:I72BDA
Signed-off-by: Nyinchuang <yinchuang@huawei.com>
Test: Build & Boot Device

Before this fix, every call to libnetsys_client.z.so's functions involves
loading the lib, searching symbols and unloading the lib. Assuming debugging a
process with lldb, it will hurt the debugging performance because lldb stops at
dlopen and dlcose (lldb inserts internal breakpoints to know which shared
library is loaded or unloaded). It is fixed by storing the handle to the lib and
function pointers globally.

Issue: I6XDBW
Test: passed most test cases of libc-test with 4 anticipated cases failed
Signed-off-by: Nhongbinj <jinhongbin2@huawei.com>

Uses sigaltstack to get current signal stack
There is no need to record in pthread structure

Issue: #I716J1
Signed-off-by: Nguzhihao4 <guzhihao4@huawei.com>
Change-Id: I22298f9bf1f7a55a10002fba70f9e05ba6b14979

Issue:I6YMRJ
Signed-off-by: Nyinchuang <yinchuang@huawei.com>
Test:Build & Boot Device

1、将设置线程detach状态的位置改为操作pthread链表之后，
   消除线程抢占之后执行pthread_join操作直接将线程从内核态删除
   并取消用户态内存映射导致用户态pthread节点未从pthread链表中删除的场景。

Close: #I6JO8B
Signed-off-by: Nzhangdengyu <zhangdengyu2@huawei.com>
Change-Id: I71d01ca0fefe4c036f174a7e63f62097865ec89d

Issue:I6XGC4
Signed-off-by: Nfangting <fangting12@huawei.com>

add lldb startup debug prop

https://gitee.com/openharmony/startup_init_lite/issues/I6X0LS?from=project-issue

not involving test cases

Change-Id: Ife6888c450dfaa894ff3f4e551c99f32dfa349c4
Signed-off-by: Nhongtao <hongtao11@huawei.com>

Issue:I6WG4X
Signed-off-by: Nyinchuang <yinchuang@huawei.com>
Test:Build && Boot Device

方案描述：
升级socket.c、nscd_query.c至1.2.3

BREAKING CHANGE:
修复测试用例对外变更描述：
1、socket接口v1.2.0中传入错误参数返回EINVAL错误码，更新之后将返回ENOENT错误码；
2、__nscd_query接口v1.2.0中给传入错误参数返回EAFNOSUPPORT错误码，更新之后将返回ENOENT错误码。

Close：#I6WWES
Signed-off-by: Nzhangdengyu <zhangdengyu2@huawei.com>
Change-Id: I877bcca7cae3a98932f2c0f39343f960c555ef76

Add define to differentice between gn and cmake.

https://gitee.com/openharmony/third_party_musl/issues/I6WT07Signed-off-by: Nliuyaning <liuyaning7@huawei.com>

Issue: #I6UV93

Test: codecheck
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I0f62d39c6e8cf691f9357d775b70554c6693c61a

Issue:I6UKTB
Signed-off-by: Nyinchuang <yinchuang@huawei.com>
Test:Build & Boot devices

Use atexit to register some callback from dso, but there is no
unregister interface. After this dso closed, this callback in
atexit callback chain is invalidate. This workround will save
the dso that the callback come from, then when dso closed, the
relative callbacks would cleared.

Issue： #I6UEZQ
Test：register atexit cb, then dlclose this dso
Signed-off-by: Nhhj <huanghuijin@huawei.com>
Change-Id: I0dfc15366dd51bbe677b9700131fbaf57622499c

 Issue: #I6U3D6
 Test: cfi demo pass
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: Ia9dbfdf18952b614cfed4a97e6366ee9cb8dedce

方案描述：
1、liteos_a调i度框架支持EDF调度算法，默认优先调度EDF策略的任务
2、用户态musl_c库适配新增调度算法，同步修改相关接口以支持用户态创建EDF进程与线程

BREAKING CHANGE:
support EDF对外变更描述：
以下接口支持SCHED_DEADLINE调度策略:
pthread_attr_getschedparam
pthread_attr_setschedparam
pthread_getschedparam
pthread_setschedparam
pthread_create
sched_getscheduler
sched_getparam
sched_setparam
sched_setscheduler

Close：#I6T3P3
Signed-off-by: Nzhangdengyu <zhangdengyu2@huawei.com>
Change-Id: I1ceefc2fdfaecac7a93e5306da629756f9385f84

Issue:I6SL6I
Signed-off-by: Nyinchuang <yinchuang@huawei.com>

    Issue: I6HRVC
    Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

Description: netsys should be enough to determine the network status and default dns is setting by the product instead of libc

Issue: https://gitee.com/openharmony/third_party_musl/issues/I6PCEM?from=project-issue
Test: libc-test pass
Signed-off-by: Nliwentao <liwentao20@huawei.com>

Change-Id: I39bdb98929bbc36b69c2b12f5bf2532be2aa3fe8

Issue: I6NO46

Test: Pass: 1146/1156
Signed-off-by: Nlutao <lutao31@huawei.com>

Issue：I6L2A1
Test：no new error reported in libc-test
Signed-off-by: NL_WeiHui <liweihui3@huawei.com>

Issue：I6L2A1
Test：no new error reported in libc-test
Signed-off-by: NL_WeiHui <liweihui3@huawei.com>

Fix codecheck warning for building

Issue:#I6EAWP
Test: Build & Boot devices
Signed-off-by: Nliyufan <liyufan5@huawei.com>

Signed-off-by: Nliweihui <liweihui3@huawei.com>

Close：#I6J7QK
Signed-off-by: Nzhangdengyu <zhangdengyu2@huawei.com>
Change-Id: I831750a1f5c945b55d6d48ea9ee14b4f57932d63

Close #I6I6M9
Signed-off-by: Nwangchen <wangchen240@huawei.com>

方案描述:
1, 对比1.23musl源码, M核合入部分新增宏定义
fix #I6I6VD
Signed-off-by: Nwangchen <wangchen240@huawei.com>

delete the mallopt interface in hook

Issue:I6IOR3
Test:Pass
Signed-off-by: Nzgq-0218 <zhaoguoqiang8@huawei.com>

    Issue: I6GQSA
    Test: libc-test pass
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

    Issue: I6IJ6H
    Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

    Issue: I6I6WX
    Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

Modify the get_nprocs_conf to count the number of cpuNN directories.
Modify the get_nprocs to read the number of CPUs in the online file.

Issue:I6FACP
Test:pass
Signed-off-by: Nmaweiye <maweiye@huawei.com>

Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I0802aad810aa82a0e68553bfc3c563006c0d159f

Issue: I68YHB
Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

    Issue: I6DO52
    Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

Signed-off-by: Nlutao <lutao31@huawei.com>

    Issue: I6DO52
    Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

Issue: I6AEEI
Test: Build & Boot Devices
Signed-off-by: Ndhy308 <tony.gan@huawei.com>

方案描述:
1, 对posix中使用锁之后,增加对锁的释放

fix #I64Y7G
Signed-off-by: Nwangchen <wangchen240@huawei.com>