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sortix--sortix/libmaxsi/signal.cpp

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/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of LibMaxsi.
LibMaxsi 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.
LibMaxsi 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 LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
signal.cpp
Handles the good old unix signals.
******************************************************************************/
#include <libmaxsi/platform.h>
#include <libmaxsi/string.h>
#include <libmaxsi/memory.h>
#include <libmaxsi/syscall.h>
#include <libmaxsi/process.h>
#include <libmaxsi/signal.h>
#include <signal.h>
namespace Maxsi
{
namespace Signal
{
void Core(int signum)
{
Process::Exit(128 + signum);
}
extern "C" void SIG_DFL(int signum)
{
if ( signum == Signal::HUP ) { Process::Exit(128 + signum); } else
if ( signum == Signal::INT ) { Process::Exit(128 + signum); } else
if ( signum == Signal::QUIT ) { Core(signum); } else
if ( signum == Signal::TRAP ) { Core(signum); } else
if ( signum == Signal::ABRT ) { Core(signum); } else
if ( signum == Signal::EMT ) { Core(signum); } else
if ( signum == Signal::FPE ) { Core(signum); } else
if ( signum == Signal::KILL ) { Process::Exit(128 + signum); } else
if ( signum == Signal::BUS ) { Core(signum); } else
if ( signum == Signal::SEGV ) { Core(signum); } else
if ( signum == Signal::SYS ) { Core(signum); } else
if ( signum == Signal::PIPE ) { Process::Exit(128 + signum); } else
if ( signum == Signal::ALRM ) { Process::Exit(128 + signum); } else
if ( signum == Signal::TERM ) { Process::Exit(128 + signum); } else
if ( signum == Signal::USR1 ) { Process::Exit(128 + signum); } else
if ( signum == Signal::USR2 ) { Process::Exit(128 + signum); } else
if ( signum == Signal::CHLD ) { /* Ignore this signal. */ } else
if ( signum == Signal::PWR ) { /* Ignore this signal. */ } else
if ( signum == Signal::WINCH ) { /* Ignore this signal. */ } else
if ( signum == Signal::URG ) { /* Ignore this signal. */ } else
if ( signum == Signal::CONT ) { /* Ignore this signal. */ } else
if ( signum == Signal::VTALRM ) { /* Ignore this signal. */ } else
if ( signum == Signal::XCPU ) { Core(signum); } else
if ( signum == Signal::XFSZ ) { Core(signum); } else
if ( signum == Signal::WAITING ) { /* Ignore this signal. */ } else
if ( signum == Signal::LWP ) { /* Ignore this signal. */ } else
if ( signum == Signal::AIO ) { /* Ignore this signal. */ } else
{ /* Ignore this signal. */ }
}
extern "C" void SIG_IGN(int /*signum*/)
{
}
extern "C" void SIG_ERR(int /*signum*/)
{
Process::Abort();
}
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_VOID(SysRegisterSignalHandler, SYSCALL_REGISTER_SIGNAL_HANDLER, sighandler_t);
DEFN_SYSCALL0_VOID(SysSigReturn, SYSCALL_SIGRETURN);
DEFN_SYSCALL2(int, SysKill, SYSCALL_KILL, pid_t, int);
void Init()
{
for ( int i = 0; i < MAX_SIGNALS; i++ )
{
handlers[i] = SIG_DFL;
}
// Tell the kernel which function we want called upon signals.
SysRegisterSignalHandler(&SignalHandlerAssembly);
}
Handler RegisterHandler(int signum, Handler handler)
{
if ( signum < 0 || MAX_SIGNALS <= signum ) { return SIG_ERR; }
return handlers[signum] = handler;
}
extern "C" sighandler_t signal(int signum, sighandler_t handler)
{
return RegisterHandler(signum, handler);
}
extern "C" int kill(pid_t pid, int signum)
{
return SysKill(pid, signum);
}
}
}