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glibc/string/strsignal.c
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/* 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; | |
} |