+
−/* Copyright (C) 1991, 1994-2002, 2005, 2008-2013 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 <http://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
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−#  include <unistd.h>
+
−# endif
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−
+
−# define INTUSE(x) (x)
+
−
+
−# if HAVE_DECL_SYS_SIGLIST
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−#  undef _sys_siglist
+
−#  define _sys_siglist sys_siglist
+
−# else /* !HAVE_DECL_SYS_SIGLIST */
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−#  ifndef NSIG
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−#   define NSIG 32
+
−#  endif /* NSIG */
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−#  if !HAVE_DECL__SYS_SIGLIST
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−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
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−   static buffer than fail.  */
+
−#define BUFFERSIZ       100
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−static char local_buf[BUFFERSIZ];
+
−static char *static_buf;
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−
+
−/* 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 *
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−strsignal (int signum)
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−{
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−  const char *desc;
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−  __libc_once_define (static, once);
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−
+
−  /* If we have not yet initialized the buffer do it now.  */
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−  __libc_once (once, init);
+
−
+
−  if (
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−#ifdef SIGRTMIN
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−      (signum >= SIGRTMIN && signum <= SIGRTMAX) ||
+
−#endif
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−      signum < 0 || signum >= NSIG
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−      || (desc = INTUSE(_sys_siglist)[signum]) == NULL)
+
−    {
+
−      char *buffer = getbuffer ();
+
−      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 - (int) SIGRTMIN);
+
−      else
+
−#endif
+
−        len = __snprintf (buffer, BUFFERSIZ - 1, _("Unknown signal %d"),
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−                          signum);
+
−      if (len >= BUFFERSIZ)
+
−        buffer = NULL;
+
−      else
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−        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
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−     to a complete statement.  (We cannot use the ISO C99 designated array
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−     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) \
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−  if (sig >= 0 && sig < NSIG) \
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−    _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;
+
−}