【背景】signal模块中的pipe用例存在无法通过测试的问题，经查找，pipe用例存在多处bug，这里做以修复

【修改方案】
1 ItPosixPipe002用例存在pipe存在在父进程中没有关闭写端，父进程判断处有编码问题等
2 删掉了一些用例多余的close函数，精简了用例的结构
3 原来用例主子进程依靠延时来实现进程同步，这里更改为使用共享内存的方法来实现

re #I3YPQ8
Signed-off-by: Nvcbchang <vcbchang@qq.com>
Change-Id: Ic0d0ab20521c9af5e5f1d75e76e047162d978464

【背景】信号管道用例ItPosixPipe005偶尔会失败，经查找，发现是CPU调度所致，延时时间与期望调度不符合，增加延时时间即可

【修改方案】修复了此问题，但是考虑pipe用例整体不稳定，并且pipe用例的pipe函数存在问题，先暂时下线，等pipe部分全部修改完毕后再上线。

re #I3XXPH
Signed-off-by: Nvcbchang <vcbchang@qq.com>
Change-Id: I21831c9f5ef5700f3b3c8da02f945e0c37f31a6a

Merge pull request !338 from phchang/rwlock

【背景】修复rwlock门禁用例多次测试出现的程序会卡死在某一个地方的问题，经查找程序会卡在循环里面

【修改方案】
1.经测试，发现用例在创建线程后对退出标志位做了初始化，但卡在循环中不动的原因是在创建线程后立刻发生了调度，没有来得及初始化，则发生了错误，故会出现卡在循环中的情况。
而且，由于卡在循环中时线程是同一优先级，可能不会发生调度，故在循环里面加了一句可以调度的语句，防止在一处循环卡的太久。
2.将该用例挪出门禁，待稳定后恢复。
【影响】
对其它用例无影响。

re #I3VUX4

Signed-off-by:vcbchang<vcbchang@qq.com>

Change-Id: Ie0f908001f59bfc832c2519104aa2e3188206910
Signed-off-by: Nvcbchang <vcbchang@qq.com>

Merge pull request !357 from JING/mount

Merge pull request !360 from 野生毛霉君/master

write "clear pathcahe" to clear pathcaches and vnodes
write "clear pagecache" to clear pagecaches
write "clear all" to clear both pathcaches and pagechaches
the cache in use will not be cleared

close: #I3XLPH
Signed-off-by: Nmucor <mucorwang@gmail.com>

Merge pull request !323 from Harylee/mem

Merge pull request !337 from jianjian/master

显示信息内容及格式修改为与posix标准一致，内容包括：
1、挂载设备名
2、挂载点路径
3、文件系统类型
4、挂载选项（此项暂不支持，打印（））
5、dump频率（此项暂不支持，值为0）
6、fsck检查次序（此项暂不支持，值为0）

close #I3XGCS
Signed-off-by: Nchenjing <chenjing139@huawei.com>
Change-Id: I2a8cb093e7c5316feb55fb196bc1b4301d8d0249

Merge pull request !347 from 刘建东/master

Merge pull request !351 from yuanbo/master

Merge pull request !344 from LeonChan/proc-uid

Merge pull request !345 from LeonChan/proc_fd

Merge pull request !352 from phchang/fix_test

【背景】mqueue144与mutex18门禁用例不稳定暂时下线

【修改方案】
将ItPosixQueue144.cpp与ItTestPthreadMutex018.cpp门禁用例暂时放入全量用例里面

re: #I3X4PR
Signed-off-by: Nvcbchang <vcbchang@qq.com>
Change-Id: I470c6bde70aa2b5956ac50a93f56776901774618

1, for users with privilege, display all users' fd info with the template "Pid  Fd  SysFd Path"
2, for normal user, display its own fd info with the template "Pid Fd Path"

close #I3WB5U
Signed-off-by: Nchenwei <chenwei26@huawei.com>

close: #I3WGVP
Signed-off-by: Nchenwei <chenwei26@huawei.com>

Driver use product_path in hb env as hcs config root path
by default. If it's not exit, try to use device config path.

close: #I3PQ10
Signed-off-by: Nyuanbo <yuanbo@huawei.com>

Merge pull request !350 from 野生毛霉君/master

add /proc/fs_cache to display vnode, path cache, page cache.
also change some bad virable name

close: #I3WWBD
Signed-off-by: Nmucor <mucorwang@gmail.com>

Merge pull request !315 from kenneth/LOS_BitmapFfz

Merge pull request !314 from kenneth/BR_Tree

Merge pull request !334 from guweijie/master

Merge pull request !349 from 野生毛霉君/master

函数LOS_BitmapFfz有2个参数，注释中只描述了一个参数，丢失了对参数numBits的描述，影响导出API文档。补充函数注释的@param部分。

close #I3U3SF
Signed-off-by: kenneth <459864689@qq.com>

内存完整性校验原有逻辑中当检测到非零异常指针后仍继续访问异常指针
next的内存域导致系统异常。
本次修改后的逻辑为：检测到非零异常指针后直接退出循环，将异常指针
的相关信息输出即可，增加了goto逻辑。对原有功能逻辑无影响。

close #I3VJZT

Change-Id: I5be06a552cf9fd74d8bd78f5cdf04db06eab4f76
Signed-off-by: NHaryslee <lihao189@huawei.com>

close: I3WTLZ
Signed-off-by: Nmucor <mucorwang@gmail.com>

Merge pull request !348 from SimonLi/revert-merge-342-master

update lwip version to 2.1.2 for lwip_enhanced

close: #I3WL4J
Signed-off-by: Nliujiandong <liujiandong1@huawei.com>

Merge pull request !342 from 野生毛霉君/master

add /proc/fs_cache to display vnode, path cache, page cache.
also change some bad virable name

close: #I3WESD
Signed-off-by: Nmucor <mucorwang@gmail.com>

Merge pull request !340 from JING/mount

close #I3W2M9
Signed-off-by: Nchenjing <chenjing139@huawei.com>
Change-Id: If8ba7047e2914a3104182bf017f437c2ae962625

Merge pull request !331 from Far/master

Signed-off-by: Njianjian <xingjian_liu@yeah.net>

Merge pull request !322 from 野生毛霉君/master

1.remove redundant headfile in kernel, such as:
  compiler.h;debug.h;automount.h;inode.h;syslog.h;net.h;
2.split fs.h to file.h and driver.h
3.move vnode.h and path_cache.h to vfs/include
4.remove redundant interface and defines

close: #I3RTNR
Signed-off-by: Nmucor <mucorwang@gmail.com>

1.modifications:
testsuites/unittest/time/timer/smoke/timer_test_tzset_001.cpp
testsuites/unittest/time/timer/smoke/timer_test_tzset_002.cpp
testsuites/unittest/time/timer/time_timer_test.cpp

2.influence:
none
Signed-off-by: Nteamol <28105285@qq.com>