[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/signal/sighold.c b/ap/libc/glibc/glibc-2.23/signal/sighold.c
new file mode 100644
index 0000000..d1f9f64
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/signal/sighold.c
@@ -0,0 +1,39 @@
+/* Add SIG to the calling process' signal mask.
+ Copyright (C) 1998-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+ 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/>. */
+
+#define __need_NULL
+#include <stddef.h>
+#include <signal.h>
+
+int
+sighold (int sig)
+{
+ sigset_t set;
+
+ /* Retrieve current signal set. */
+ if (__sigprocmask (SIG_SETMASK, NULL, &set) < 0)
+ return -1;
+
+ /* Add the specified signal. */
+ if (sigaddset (&set, sig) < 0)
+ return -1;
+
+ /* Set the new mask. */
+ return __sigprocmask (SIG_SETMASK, &set, NULL);
+}