136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix is free software: you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation, either version 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix 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 General Public License for more
|
|
details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
signal.cpp
|
|
Classes and functions making it easier to handle Unix signals.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sortix/kernel/platform.h>
|
|
#include <sortix/kernel/panic.h>
|
|
#include <sortix/signal.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include "interrupt.h"
|
|
#include "thread.h"
|
|
#include "signal.h"
|
|
|
|
namespace Sortix {
|
|
|
|
// A per-cpu value whether a signal is pending in the running task.
|
|
extern "C" { volatile unsigned long asm_signal_is_pending = 0; }
|
|
|
|
namespace Signal {
|
|
|
|
const int PRIORITIES[SIG__NUM_DECLARED] =
|
|
{
|
|
SIG_PRIO_NORMAL, // unused
|
|
SIG_PRIO_NORMAL, // SIGHUP
|
|
SIG_PRIO_NORMAL, // SIGINT
|
|
SIG_PRIO_NORMAL, // SIGQUIT
|
|
SIG_PRIO_CORE, // SIGILL
|
|
SIG_PRIO_CORE, // SIGTRAP
|
|
SIG_PRIO_CORE, // SIGABRT
|
|
SIG_PRIO_CORE, // SIGEMT
|
|
SIG_PRIO_CORE, // SIGFPE
|
|
SIG_PRIO_KILL, // SIGKILL
|
|
SIG_PRIO_CORE, // SIGBUS
|
|
SIG_PRIO_CORE, // SIGSEGV
|
|
SIG_PRIO_CORE, // SIGSYS
|
|
SIG_PRIO_NORMAL, // SIGPIPE
|
|
SIG_PRIO_NORMAL, // SIGALRM
|
|
SIG_PRIO_NORMAL, // SIGTERM
|
|
SIG_PRIO_NORMAL, // SIGUSR1
|
|
SIG_PRIO_NORMAL, // SIGUSR2
|
|
SIG_PRIO_NORMAL, // SIGCHLD
|
|
SIG_PRIO_HIGH, // SIGPWR
|
|
SIG_PRIO_NORMAL, // SIGWINCH
|
|
SIG_PRIO_NORMAL, // SIGURG
|
|
SIG_PRIO_NORMAL, // obsolete
|
|
SIG_PRIO_STOP, // SIGSTOP
|
|
SIG_PRIO_STOP, // SIGTSTP
|
|
SIG_PRIO_STOP, // SIGCONT
|
|
SIG_PRIO_STOP, // SIGTTIN
|
|
SIG_PRIO_STOP, // SIGTTOU
|
|
SIG_PRIO_NORMAL, // SIGVTALRM
|
|
SIG_PRIO_NORMAL, // obsolete
|
|
SIG_PRIO_CORE, // SIGXCPU
|
|
SIG_PRIO_CORE, // SIGXFSZ
|
|
SIG_PRIO_NORMAL, // SIGCORE
|
|
SIG_PRIO_NORMAL, // SIGLWP
|
|
SIG_PRIO_NORMAL, // SIGAIO
|
|
};
|
|
|
|
int Priority(int signum)
|
|
{
|
|
assert(0 <= signum && signum < SIG_MAX_NUM);
|
|
if ( !signum )
|
|
return -1;
|
|
if ( SIG__NUM_DECLARED <= signum )
|
|
return SIG_PRIO_NORMAL;
|
|
return PRIORITIES[signum];
|
|
}
|
|
|
|
Queue::Queue()
|
|
{
|
|
for ( int i = 1; i < SIG_MAX_NUM; i++ )
|
|
pending[i] = false;
|
|
}
|
|
|
|
void Queue::Push(int signum)
|
|
{
|
|
assert(0 < signum && signum < SIG_MAX_NUM);
|
|
pending[signum] = true;
|
|
}
|
|
|
|
int Queue::Pop(int cursig)
|
|
{
|
|
int best = 0;
|
|
int bestprio = Priority(cursig);
|
|
for ( int i = 1; i < SIG_MAX_NUM; i++ )
|
|
if ( pending[i] && bestprio < Priority(i) )
|
|
{
|
|
best = i;
|
|
bestprio = Priority(i);
|
|
}
|
|
pending[best] = false;
|
|
return best;
|
|
}
|
|
|
|
void Dispatch(CPU::InterruptRegisters* regs, void* /*user*/)
|
|
{
|
|
return CurrentThread()->HandleSignal(regs);
|
|
}
|
|
|
|
void Return(CPU::InterruptRegisters* regs, void* /*user*/)
|
|
{
|
|
return CurrentThread()->HandleSigreturn(regs);
|
|
}
|
|
|
|
void Init()
|
|
{
|
|
Interrupt::RegisterRawHandler(130, isr130, true);
|
|
Interrupt::RegisterHandler(130, Dispatch, NULL);
|
|
Interrupt::RegisterRawHandler(131, isr131, true);
|
|
Interrupt::RegisterHandler(131, Return, NULL);
|
|
}
|
|
|
|
} // namespace Signal
|
|
} // namespace Sortix
|