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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libintl.h>
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#include <libc-lock.h>
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static __libc_key_t key;
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/* If nonzero the key allocation failed and we should better use a
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static buffer than fail. */
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#define BUFFERSIZ 100
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static char local_buf[BUFFERSIZ];
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static char *static_buf;
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/* Destructor for the thread-specific data. */
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static void init (void);
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static void free_key_mem (void *mem);
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static char *getbuffer (void);
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/* Return a string describing the meaning of the signal number SIGNUM. */
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char *
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strsignal (int signum)
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{
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__libc_once_define (static, once);
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const char *desc;
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/* If we have not yet initialized the buffer do it now. */
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__libc_once (once, init);
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if (
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#ifdef SIGRTMIN
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(signum >= SIGRTMIN && signum <= SIGRTMAX) ||
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#endif
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signum < 0 || signum >= NSIG
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|| (desc = _sys_siglist[signum]) == NULL)
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{
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char *buffer = getbuffer ();
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int len;
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#ifdef SIGRTMIN
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if (signum >= SIGRTMIN && signum <= SIGRTMAX)
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len = __snprintf (buffer, BUFFERSIZ - 1, _("Real-time signal %d"),
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signum - SIGRTMIN);
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else
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#endif
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len = __snprintf (buffer, BUFFERSIZ - 1, _("Unknown signal %d"),
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signum);
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if (len >= BUFFERSIZ)
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buffer = NULL;
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else
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buffer[len] = '\0';
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return buffer;
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}
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return (char *) _(desc);
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}
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/* Initialize buffer. */
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static void
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init (void)
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{
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if (__libc_key_create (&key, free_key_mem))
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/* Creating the key failed. This means something really went
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wrong. In any case use a static buffer which is better than
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nothing. */
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static_buf = local_buf;
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}
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/* Free the thread specific data, this is done if a thread terminates. */
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static void
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free_key_mem (void *mem)
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{
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free (mem);
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__libc_setspecific (key, NULL);
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}
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/* Return the buffer to be used. */
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static char *
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getbuffer (void)
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{
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char *result;
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if (static_buf != NULL)
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result = static_buf;
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else
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{
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/* We don't use the static buffer and so we have a key. Use it
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to get the thread-specific buffer. */
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result = __libc_getspecific (key);
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if (result == NULL)
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{
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/* No buffer allocated so far. */
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result = malloc (BUFFERSIZ);
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if (result == NULL)
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/* No more memory available. We use the static buffer. */
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result = local_buf;
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else
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__libc_setspecific (key, result);
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}
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}
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return result;
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}
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