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 <signal.h> 20 #include <stdlib.h> 21 22 #include "signals.h" 23 #include "progops.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 void __signals_fpe_handler(int signum, siginfo_t *siginfo, void *context) 39 { 40 /* Return from setjmp using the signal number. */ 41 42 switch (siginfo->si_code) 43 { 44 case FPE_FLTOVF: 45 __raise_overflow_error(); 46 break; 47 48 case FPE_FLTUND: 49 __raise_underflow_error(); 50 break; 51 52 case FPE_FLTDIV: 53 __raise_zero_division_error(); 54 break; 55 56 default: 57 __raise_floating_point_error(); 58 break; 59 } 60 }