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sortix--sortix/kernel/alarm.cpp
2014-12-03 14:19:49 +01:00

65 lines
2 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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/>.
alarm.cpp
Sends a signal after a certain amount of time has passed.
*******************************************************************************/
#include <errno.h>
#include <timespec.h>
#include <sortix/itimerspec.h>
#include <sortix/signal.h>
#include <sortix/kernel/clock.h>
#include <sortix/kernel/copy.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/process.h>
#include <sortix/kernel/syscall.h>
#include <sortix/kernel/timer.h>
namespace Sortix {
static void alarm_handler(Clock* /*clock*/, Timer* /*timer*/, void* user)
{
Process* process = (Process*) user;
ScopedLock lock(&process->user_timers_lock);
process->DeliverSignal(SIGALRM);
}
int sys_alarmns(const struct timespec* user_delay, struct timespec* user_odelay)
{
Process* process = CurrentProcess();
ScopedLock lock(&process->user_timers_lock);
struct itimerspec delay, odelay;
if ( !CopyFromUser(&delay.it_value, user_delay, sizeof(*user_delay)) )
return -1;
delay.it_interval = timespec_nul();
process->alarm_timer.Set(&delay, &odelay, 0, alarm_handler, (void*) process);
if ( !CopyToUser(user_odelay, &odelay.it_value, sizeof(*user_odelay)) )
return -1;
return 0;
}
} // namespace Sortix