paul@872 | 1 | /* Signal handling. |
paul@872 | 2 | |
paul@872 | 3 | Copyright (C) 2019 Paul Boddie <paul@boddie.org.uk> |
paul@872 | 4 | |
paul@872 | 5 | This program is free software; you can redistribute it and/or modify it under |
paul@872 | 6 | the terms of the GNU General Public License as published by the Free Software |
paul@872 | 7 | Foundation; either version 3 of the License, or (at your option) any later |
paul@872 | 8 | version. |
paul@872 | 9 | |
paul@872 | 10 | This program is distributed in the hope that it will be useful, but WITHOUT |
paul@872 | 11 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
paul@872 | 12 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
paul@872 | 13 | details. |
paul@872 | 14 | |
paul@872 | 15 | You should have received a copy of the GNU General Public License along with |
paul@872 | 16 | this program. If not, see <http://www.gnu.org/licenses/>. |
paul@872 | 17 | */ |
paul@872 | 18 | |
paul@872 | 19 | #include <signal.h> |
paul@872 | 20 | #include <stdlib.h> |
paul@872 | 21 | |
paul@872 | 22 | #include "signals.h" |
paul@879 | 23 | #include "progops.h" |
paul@872 | 24 | |
paul@872 | 25 | void __signals_install_handlers() |
paul@872 | 26 | { |
paul@872 | 27 | struct sigaction context; |
paul@872 | 28 | |
paul@872 | 29 | context.sa_flags = SA_SIGINFO; |
paul@872 | 30 | context.sa_sigaction = __signals_fpe_handler; |
paul@872 | 31 | sigemptyset(&context.sa_mask); |
paul@872 | 32 | |
paul@872 | 33 | /* NOTE: Should test for -1 and errno. */ |
paul@872 | 34 | |
paul@872 | 35 | sigaction(SIGFPE, &context, NULL); |
paul@872 | 36 | } |
paul@872 | 37 | |
paul@872 | 38 | void __signals_fpe_handler(int signum, siginfo_t *siginfo, void *context) |
paul@872 | 39 | { |
paul@879 | 40 | /* Return from setjmp using the signal number. */ |
paul@879 | 41 | |
paul@879 | 42 | switch (siginfo->si_code) |
paul@879 | 43 | { |
paul@879 | 44 | case FPE_FLTOVF: |
paul@879 | 45 | __raise_overflow_error(); |
paul@879 | 46 | break; |
paul@872 | 47 | |
paul@879 | 48 | case FPE_FLTUND: |
paul@879 | 49 | __raise_underflow_error(); |
paul@879 | 50 | break; |
paul@879 | 51 | |
paul@879 | 52 | case FPE_FLTDIV: |
paul@879 | 53 | __raise_zero_division_error(); |
paul@879 | 54 | break; |
paul@879 | 55 | |
paul@879 | 56 | default: |
paul@879 | 57 | __raise_floating_point_error(); |
paul@879 | 58 | break; |
paul@879 | 59 | } |
paul@872 | 60 | } |