修复ppoll接口"[ERR]OsMemFree check error!"报错

【背景】
1.内核中释放用户空间指针报错:"[ERR]OsMemFree check error!"
2.现有ppoll实现存在问题
3.相关用例需要整理
【修改方案】
1.去掉释放用户空间指针操作
2.更正逻辑错误
3.更正掩码设置与恢复不起作用
4.修复补充现有用例
【影响】
对现有的产品编译不会有影响。

re #I47YWZ

Change-Id: Ib2f60986e9cafb2ea5ef1097ab8552cbb1ede5b4
Signed-off-by: lnlan <lanleinan@163.com>

kernel/base/ipc/los_signal.c

@@ -218,28 +218,22 @@ void OsSigMaskSwitch(LosTaskCB * const rtcb, sigset_t set)
     }
 }
 
-int OsSigprocMask(int how, const sigset_t_l *setl, sigset_t_l *oldset)
+int OsSigprocMask(int how, const sigset_t_l *setl, sigset_t_l *oldsetl)
 {
     LosTaskCB *spcb = NULL;
-    sigset_t oldSigprocmask;
     int ret = LOS_OK;
     unsigned int intSave;
     sigset_t set;
-    int retVal;
 
-    if (setl != NULL) {
-        retVal = LOS_CopyToKernel(&set, sizeof(sigset_t), &(setl->sig[0]), sizeof(sigset_t));
-        if (retVal != 0) {
-            return -EFAULT;
-        }
-    }
     SCHEDULER_LOCK(intSave);
     spcb = OsCurrTaskGet();
     /* If requested, copy the old mask to user. */
-    oldSigprocmask = spcb->sig.sigprocmask;
-
+    if (oldsetl != NULL) {
+        *(sigset_t *)oldsetl = spcb->sig.sigprocmask;
+    }
     /* If requested, modify the current signal mask. */
     if (setl != NULL) {
+        set = *(sigset_t *)setl;
         /* Okay, determine what we are supposed to do */
         switch (how) {
             /* Set the union of the current set and the signal
@@ -267,12 +261,6 @@ int OsSigprocMask(int how, const sigset_t_l *setl, sigset_t_l *oldset)
     }
     SCHEDULER_UNLOCK(intSave);
 
-    if (oldset != NULL) {
-        retVal = LOS_CopyFromKernel(&(oldset->sig[0]), sizeof(sigset_t), &oldSigprocmask, sizeof(sigset_t));
-        if (retVal != 0) {
-            return -EFAULT;
-        }
-    }
     return ret;
 }