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74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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signal/sigaction.cpp
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Set the action that happens when a signal is triggered.
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*******************************************************************************/
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#include <stdio.h>
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#include <signal.h>
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const int MAX_SIGNALS = 128;
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extern sighandler_t handlers[MAX_SIGNALS];
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// TODO: Actually implement the sigaction interface for real.
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extern "C"
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int sigaction(int signum, const struct sigaction* restrict act,
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struct sigaction* restrict oldact)
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{
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if ( !act )
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{
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// TODO: set oldact->sa_mask here?
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oldact->sa_sigaction = NULL;
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oldact->sa_handler = handlers[signum];
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oldact->sa_flags = 0;
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return 0;
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}
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int understood_flags = SA_SIGINFO | SA_RESTART;
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if ( act->sa_flags & ~understood_flags )
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{
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fprintf(stderr, "%s:%u sigaction with unsupported flags 0x%x, ignoring "
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"hoping they aren't needed.\n", __FILE__, __LINE__,
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act->sa_flags & ~understood_flags);
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}
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if ( act->sa_flags & SA_RESTART )
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/* TODO: Actually implement this. Signals are a bit rare on Sortix right
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now, so it doesn't matter much that system calls don't restart
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on Sortix, so pretend that they do. */ {};
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if ( act->sa_flags & SA_SIGINFO )
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{
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fprintf(stderr, "%s:%u sigaction with unsupported SA_SIGINFO, ignoring "
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"hoping the signal never happens.\n", __FILE__,
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__LINE__);
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return 0;
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}
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sighandler_t new_handler = act->sa_handler;
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sighandler_t old_handler = signal(signum, new_handler);
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if ( old_handler == SIG_ERR )
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return -1;
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if ( oldact )
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{
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// TODO: set oldact->sa_mask here?
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oldact->sa_sigaction = NULL;
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oldact->sa_handler = old_handler;
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oldact->sa_flags = 0;
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}
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return 0;
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}
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