[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/sysdeps/posix/sigwait.c b/ap/libc/glibc/glibc-2.23/sysdeps/posix/sigwait.c
new file mode 100644
index 0000000..b9b3281
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/sysdeps/posix/sigwait.c
@@ -0,0 +1,108 @@
+/* Implementation of sigwait function from POSIX.1c.
+ Copyright (C) 1996-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <signal.h>
+#include <stddef.h> /* For NULL. */
+#include <sysdep-cancel.h>
+
+/* This is our dummy signal handler we use here. */
+static void ignore_signal (int sig);
+
+/* Place where to remember which signal we got. Please note that this
+ implementation cannot be used for the threaded libc. The
+ libpthread must provide an own version. */
+static int was_sig;
+
+
+static int
+do_sigwait (const sigset_t *set, int *sig)
+{
+ sigset_t tmp_mask;
+ struct sigaction saved[NSIG];
+ struct sigaction action;
+ int save_errno;
+ int this;
+
+ /* Prepare set. */
+ __sigfillset (&tmp_mask);
+
+ /* Unblock all signals in the SET and register our nice handler. */
+ action.sa_handler = ignore_signal;
+ action.sa_flags = 0;
+ __sigfillset (&action.sa_mask); /* Block all signals for handler. */
+
+ /* Make sure we recognize error conditions by setting WAS_SIG to a
+ value which does not describe a legal signal number. */
+ was_sig = -1;
+
+ for (this = 1; this < NSIG; ++this)
+ if (__sigismember (set, this))
+ {
+ /* Unblock this signal. */
+ __sigdelset (&tmp_mask, this);
+
+ /* Register temporary action handler. */
+ if (__sigaction (this, &action, &saved[this]) != 0)
+ goto restore_handler;
+ }
+
+ /* Now we can wait for signals. */
+ __sigsuspend (&tmp_mask);
+
+ restore_handler:
+ save_errno = errno;
+
+ while (--this >= 1)
+ if (__sigismember (set, this))
+ /* We ignore errors here since we must restore all handlers. */
+ __sigaction (this, &saved[this], NULL);
+
+ __set_errno (save_errno);
+
+ /* Store the result and return. */
+ *sig = was_sig;
+ return was_sig == -1 ? -1 : 0;
+}
+
+
+int
+__sigwait (const sigset_t *set, int *sig)
+{
+ if (SINGLE_THREAD_P)
+ return do_sigwait (set, sig);
+
+ int oldtype = LIBC_CANCEL_ASYNC ();
+
+ int result = do_sigwait (set, sig);
+
+ LIBC_CANCEL_RESET (oldtype);
+
+ return result;
+}
+libc_hidden_def (__sigwait)
+weak_alias (__sigwait, sigwait)
+
+
+static void
+ignore_signal (int sig)
+{
+ /* Remember the signal. */
+ was_sig = sig;
+}