[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/string/strsignal.c b/ap/libc/glibc/glibc-2.23/string/strsignal.c
new file mode 100644
index 0000000..706d6d3
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/strsignal.c
@@ -0,0 +1,125 @@
+/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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 <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libintl.h>
+#include <libc-lock.h>
+
+static __libc_key_t key;
+
+/* If nonzero the key allocation failed and we should better use a
+ static buffer than fail. */
+#define BUFFERSIZ 100
+static char local_buf[BUFFERSIZ];
+static char *static_buf;
+
+/* Destructor for the thread-specific data. */
+static void init (void);
+static void free_key_mem (void *mem);
+static char *getbuffer (void);
+
+
+/* Return a string describing the meaning of the signal number SIGNUM. */
+char *
+strsignal (int signum)
+{
+ __libc_once_define (static, once);
+ const char *desc;
+
+ /* If we have not yet initialized the buffer do it now. */
+ __libc_once (once, init);
+
+ if (
+#ifdef SIGRTMIN
+ (signum >= SIGRTMIN && signum <= SIGRTMAX) ||
+#endif
+ signum < 0 || signum >= NSIG
+ || (desc = _sys_siglist[signum]) == NULL)
+ {
+ char *buffer = getbuffer ();
+ int len;
+#ifdef SIGRTMIN
+ if (signum >= SIGRTMIN && signum <= SIGRTMAX)
+ len = __snprintf (buffer, BUFFERSIZ - 1, _("Real-time signal %d"),
+ signum - SIGRTMIN);
+ else
+#endif
+ len = __snprintf (buffer, BUFFERSIZ - 1, _("Unknown signal %d"),
+ signum);
+ if (len >= BUFFERSIZ)
+ buffer = NULL;
+ else
+ buffer[len] = '\0';
+
+ return buffer;
+ }
+
+ return (char *) _(desc);
+}
+
+
+/* Initialize buffer. */
+static void
+init (void)
+{
+ if (__libc_key_create (&key, free_key_mem))
+ /* Creating the key failed. This means something really went
+ wrong. In any case use a static buffer which is better than
+ nothing. */
+ static_buf = local_buf;
+}
+
+
+/* Free the thread specific data, this is done if a thread terminates. */
+static void
+free_key_mem (void *mem)
+{
+ free (mem);
+ __libc_setspecific (key, NULL);
+}
+
+
+/* Return the buffer to be used. */
+static char *
+getbuffer (void)
+{
+ char *result;
+
+ if (static_buf != NULL)
+ result = static_buf;
+ else
+ {
+ /* We don't use the static buffer and so we have a key. Use it
+ to get the thread-specific buffer. */
+ result = __libc_getspecific (key);
+ if (result == NULL)
+ {
+ /* No buffer allocated so far. */
+ result = malloc (BUFFERSIZ);
+ if (result == NULL)
+ /* No more memory available. We use the static buffer. */
+ result = local_buf;
+ else
+ __libc_setspecific (key, result);
+ }
+ }
+
+ return result;
+}