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/* Copyright (C) 1991, 1994-2002, 2005, 2008-2020 Free Software Foundation,
Inc.
This file is part of the GNU C Library.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _LIBC
# include <config.h>
#endif
/* Specification. */
#include <string.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef _LIBC
# include <libintl.h>
#else /* !_LIBC */
# include "gettext.h"
# define _(msgid) gettext (msgid)
# define N_(msgid) gettext_noop (msgid)
#endif /* _LIBC */
#ifdef _LIBC
# include <bits/libc-lock.h>
#else /* !_LIBC */
# include "glthread/lock.h"
# include "glthread/tls.h"
# define __libc_once_define(CLASS, NAME) gl_once_define (CLASS, NAME)
# define __libc_once(NAME, INIT) gl_once ((NAME), (INIT))
# define __libc_key_t gl_tls_key_t
# define __libc_getspecific(NAME) gl_tls_get ((NAME))
# define __libc_setspecific(NAME, POINTER) gl_tls_set ((NAME), (POINTER))
# define __snprintf snprintf
#endif /* _LIBC */
#ifdef _LIBC
/* Defined in siglist.c. */
extern const char *const _sys_siglist[];
extern const char *const _sys_siglist_internal[] attribute_hidden;
#else /* !_LIBC */
/* NetBSD declares sys_siglist in unistd.h. */
# if HAVE_UNISTD_H
# include <unistd.h>
# endif
# define INTUSE(x) (x)
# if HAVE_DECL_SYS_SIGLIST
# undef _sys_siglist
# define _sys_siglist sys_siglist
# else /* !HAVE_DECL_SYS_SIGLIST */
# ifndef NSIG
# define NSIG 32
# endif /* NSIG */
# if !HAVE_DECL__SYS_SIGLIST
static const char *_sys_siglist[NSIG];
# endif
# endif /* !HAVE_DECL_SYS_SIGLIST */
#endif /* _LIBC */
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)
{
const char *desc;
__libc_once_define (static, once);
/* 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 = INTUSE(_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 - (int) 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)
{
#ifdef _LIBC
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;
#else /* !_LIBC */
gl_tls_key_init (key, free_key_mem);
# if !HAVE_DECL_SYS_SIGLIST
memset (_sys_siglist, 0, NSIG * sizeof *_sys_siglist);
/* No need to use a do {} while (0) here since init_sig(...) must expand
to a complete statement. (We cannot use the ISO C99 designated array
initializer syntax since it is not supported by ANSI C compilers and
since some signal numbers might exceed NSIG.) */
# define init_sig(sig, abbrev, desc) \
if (sig >= 0 && sig < NSIG) \
_sys_siglist[sig] = desc;
# include "siglist.h"
# undef init_sig
# endif /* !HAVE_DECL_SYS_SIGLIST */
#endif /* !_LIBC */
}
/* 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;
}
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