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sortix--sortix/libc/signal/signal.cpp
2013-12-17 14:30:38 +01:00

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1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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/>.
signal/signal.cpp
Handles the good old unix signals.
*******************************************************************************/
#include <sys/types.h>
#include <sys/syscall.h>
#include <signal.h>
const int MAX_SIGNALS = 128;
sighandler_t handlers[MAX_SIGNALS];
extern "C" void SignalHandlerAssembly(int signum);
extern "C" void SignalHandler(int signum)
{
if ( 0 <= signum && signum < (int) MAX_SIGNALS )
handlers[signum](signum);
}
DEFN_SYSCALL1(int, sys_register_signal_handler, SYSCALL_REGISTER_SIGNAL_HANDLER, sighandler_t);
extern "C" void init_signal()
{
for ( int i = 0; i < MAX_SIGNALS; i++ )
handlers[i] = SIG_DFL;
// Tell the kernel which function we want called upon signals.
sys_register_signal_handler(&SignalHandlerAssembly);
}
extern "C" sighandler_t signal(int signum, sighandler_t handler)
{
if ( signum < 0 || MAX_SIGNALS <= signum ) { return SIG_ERR; }
return handlers[signum] = handler;
}