1 /* Signal handling. 2 3 Copyright (C) 2019 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <setjmp.h> 20 #include <signal.h> 21 #include <stdlib.h> 22 23 #include "signals.h" 24 25 void __signals_install_handlers() 26 { 27 struct sigaction context; 28 29 context.sa_flags = SA_SIGINFO; 30 context.sa_sigaction = __signals_fpe_handler; 31 sigemptyset(&context.sa_mask); 32 33 /* NOTE: Should test for -1 and errno. */ 34 35 sigaction(SIGFPE, &context, NULL); 36 } 37 38 jmp_buf __fpe_env; 39 40 void __signals_fpe_handler(int signum, siginfo_t *siginfo, void *context) 41 { 42 /* Return from setjmp with the signal number. */ 43 44 longjmp(__fpe_env, siginfo->si_code); 45 }