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Add sigaction(2).

This commit is contained in:
Jonas 'Sortie' Termansen 2013-04-18 12:42:04 +02:00
parent 615bf32c60
commit e88d492efd
2 changed files with 74 additions and 0 deletions
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1
libc/Makefile
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@ -302,6 +302,7 @@ setlocale.o \
settermmode.o \
setuid.o \
sfork.o \
sigaction.o \
SIG_DFL.o \
SIG_ERR.o \
SIG_IGN.o \

73
libc/sigaction.cpp Normal file
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@ -0,0 +1,73 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
sigaction.cpp
Set the action that happens when a signal is triggered.
*******************************************************************************/
#include <stdio.h>
#include <signal.h>
const int MAX_SIGNALS = 128;
extern sighandler_t handlers[MAX_SIGNALS];
// TODO: Actually implement the sigaction interface for real.
int sigaction(int signum, const struct sigaction* restrict act,
struct sigaction* restrict oldact)
{
if ( !act )
{
// TODO: set oldact->sa_mask here?
oldact->sa_sigaction = NULL;
oldact->sa_handler = handlers[signum];
oldact->sa_flags = 0;
return 0;
}
int understood_flags = SA_SIGINFO | SA_RESTART;
if ( act->sa_flags & ~understood_flags )
{
fprintf(stderr, "%s:%u sigaction with unsupported flags 0x%x, ignoring "
"hoping they aren't needed.\n", __FILE__, __LINE__,
act->sa_flags & ~understood_flags);
}
if ( act->sa_flags & SA_RESTART )
/* TODO: Actually implement this. Signals are a bit rare on Sortix right
now, so it doesn't matter much that system calls don't restart
on Sortix, so pretend that they do. */ {};
if ( act->sa_flags & SA_SIGINFO )
{
fprintf(stderr, "%s:%u sigaction with unsupported SA_SIGINFO, ignoring "
"hoping the signal never happens.\n", __FILE__,
__LINE__);
return 0;
}
sighandler_t new_handler = act->sa_handler;
sighandler_t old_handler = signal(signum, new_handler);
if ( old_handler == SIG_ERR )
return -1;
if ( oldact )
{
// TODO: set oldact->sa_mask here?
oldact->sa_sigaction = NULL;
oldact->sa_handler = old_handler;
oldact->sa_flags = 0;
}
return 0;
}