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      1 /* Expression evaluation for plural form selection.
      2    Copyright (C) 2000-2003, 2005 Free Software Foundation, Inc.
      3    Written by Ulrich Drepper <drepper (at) cygnus.com>, 2000.
      4 
      5    This program is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by
      7    the Free Software Foundation; either version 2, or (at your option)
      8    any later version.
      9 
     10    This program is distributed in the hope that it will be useful,
     11    but WITHOUT ANY WARRANTY; without even the implied warranty of
     12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13    GNU General Public License for more details.
     14 
     15    You should have received a copy of the GNU General Public License
     16    along with this program; if not, write to the Free Software Foundation,
     17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
     18 
     19 #ifdef HAVE_CONFIG_H
     20 # include <config.h>
     21 #endif
     22 
     23 /* Specification.  */
     24 #include "plural-eval.h"
     25 
     26 #include <stddef.h>
     27 #include <signal.h>
     28 
     29 #include "plural-exp.h"
     30 
     31 
     32 #define STATIC /*extern*/
     33 
     34 /* Include the expression evaluation code from libintl, this time with
     35    'extern' linkage.  */
     36 #include "eval-plural.h"
     37 
     38 
     39 /* Exit point.  Must be set before calling install_sigfpe_handler().  */
     40 sigjmp_buf sigfpe_exit;
     41 
     42 #if USE_SIGINFO
     43 
     44 /* Additional information that is set before sigfpe_exit is invoked.  */
     45 int sigfpe_code;
     46 
     47 /* Signal handler called in case of arithmetic exception (e.g. division
     48    by zero) during plural_eval.  */
     49 static void
     50 sigfpe_handler (int sig, siginfo_t *sip, void *scp)
     51 {
     52   sigfpe_code = sip->si_code;
     53   siglongjmp (sigfpe_exit, 1);
     54 }
     55 
     56 #else
     57 
     58 /* Signal handler called in case of arithmetic exception (e.g. division
     59    by zero) during plural_eval.  */
     60 static void
     61 sigfpe_handler (int sig)
     62 {
     63   siglongjmp (sigfpe_exit, 1);
     64 }
     65 
     66 #endif
     67 
     68 void
     69 install_sigfpe_handler (void)
     70 {
     71 #if USE_SIGINFO
     72   struct sigaction action;
     73   action.sa_sigaction = sigfpe_handler;
     74   action.sa_flags = SA_SIGINFO;
     75   sigemptyset (&action.sa_mask);
     76   sigaction (SIGFPE, &action, (struct sigaction *) NULL);
     77 #else
     78   signal (SIGFPE, sigfpe_handler);
     79 #endif
     80 }
     81 
     82 void
     83 uninstall_sigfpe_handler (void)
     84 {
     85 #if USE_SIGINFO
     86   struct sigaction action;
     87   action.sa_handler = SIG_DFL;
     88   action.sa_flags = 0;
     89   sigemptyset (&action.sa_mask);
     90   sigaction (SIGFPE, &action, (struct sigaction *) NULL);
     91 #else
     92   signal (SIGFPE, SIG_DFL);
     93 #endif
     94 }
     95