string/strsignal.c

   1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <signal.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <libintl.h>
  23 #include <tls-internal.h>
  24
  25 /* Return a string describing the meaning of the signal number SIGNUM.  */
  26 char *
  27 strsignal (int signum)
  28 {
  29   const char *desc = __sigdescr_np (signum);
  30   if (desc != NULL)
  31     return _(desc);
  32
  33   struct tls_internal_t *tls_internal = __glibc_tls_internal ();
  34   free (tls_internal->strsignal_buf);
  35
  36   int r;
  37 #ifdef SIGRTMIN
  38   if (signum >= SIGRTMIN && signum <= SIGRTMAX)
  39     r = __asprintf (&tls_internal->strsignal_buf, _("Real-time signal %d"),
  40                     signum - SIGRTMIN);
  41   else
  42 #endif
  43     r = __asprintf (&tls_internal->strsignal_buf, _("Unknown signal %d"),
  44                     signum);
  45
  46   if (r == -1)
  47     tls_internal->strsignal_buf = NULL;
  48
  49   return tls_internal->strsignal_buf;
  50 }