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/*
FALCON - The Falcon Programming Language.
FILE: signals_posix.cpp
POSIX-specific signal handling
-------------------------------------------------------------------
Author: Jan Dvorak
Begin: Fri, 12 Feb 2010 11:23:13 +0100
-------------------------------------------------------------------
(C) Copyright 2009: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
#include <falcon/signals_posix.h>
#include <falcon/lineardict.h>
#include <unistd.h>
#include <string.h>
#if !defined(__linux__) || !defined(__sun)
# define __BSD__
#endif
namespace Falcon {
SignalReceiver *signalReceiver = 0;
void signal_handler(int signum, siginfo_t *siginfo, void *ctx)
{
signalReceiver->deliver(signum, siginfo);
}
SignalReceiver::SignalReceiver(VMachine *targetVM):
m_thread(0),
m_shallRun(false)
{
m_targetVM = targetVM;
}
SignalReceiver::~SignalReceiver()
{
stop();
}
void SignalReceiver::start()
{
if (0 != m_thread)
return;
m_thread = new SysThread(this);
m_shallRun = true;
m_thread->start();
}
void SignalReceiver::stop()
{
if (0 == m_thread)
return;
void *dummy;
m_shallRun = false;
wakeup();
m_thread->join(dummy);
m_thread = 0;
}
void *SignalReceiver::run()
{
sigset_t sigset;
/*
* Allow all signals in this thread.
*/
sigemptyset(&sigset);
sigaddset(&sigset, SIGCONT);
pthread_sigmask(SIG_SETMASK, &sigset, NULL);
/* Wait... and wait... and wait. */
while (m_shallRun)
{
#ifndef __APPLE__
sigwaitinfo(&sigset, NULL);
#else
sigwait(&sigset, NULL);
#endif
}
return 0;
}
bool SignalReceiver::trap(int signum)
{
struct sigaction sigaction;
sigaction.sa_sigaction = signal_handler;
sigfillset(&sigaction.sa_mask);
sigaction.sa_flags = SA_SIGINFO;
return 0 == ::sigaction(signum, &sigaction, 0);
}
bool SignalReceiver::reset(int signum)
{
return 0 == ::signal(signum, SIG_DFL);
}
void SignalReceiver::deliver(int signum, siginfo_t *siginfo)
{
VMMessage *m = new VMMessage("os.signal");
LinearDict *ld = new LinearDict();
CoreDict *cd = new CoreDict(ld);
ld->put(new CoreString("signo"), (int32)signum);
ld->put(new CoreString("errno"), (int32)siginfo->si_errno);
ld->put(new CoreString("code"), (int32)siginfo->si_code);
#ifndef __APPLE__
if (SIGCHLD == signum || (signum >= SIGRTMIN && signum <= SIGRTMAX)) {
ld->put(new CoreString("pid"), (int32)siginfo->si_pid);
ld->put(new CoreString("uid"), (int32)siginfo->si_uid);
#ifndef __BSD__
ld->put(new CoreString("utime"), (int64)siginfo->si_utime);
ld->put(new CoreString("stime"), (int64)siginfo->si_stime);
#endif
}
if (signum >= SIGRTMIN && signum <= SIGRTMAX) {
#ifdef _POSIX_SOURCE
ld->put(new CoreString("overrun"), (int32)siginfo->si_overrun);
ld->put(new CoreString("timerid"), (int32)siginfo->si_timerid);
ld->put(new CoreString("int"), (int32)siginfo->si_int);
#endif
}
if (SIGCHLD == signum) {
ld->put(new CoreString("status"), (int32)siginfo->si_status);
}
#ifndef __BSD__
if (SIGPOLL == signum) {
ld->put(new CoreString("band"), (int32)siginfo->si_band);
ld->put(new CoreString("fd"), (int32)siginfo->si_fd);
}
#endif
#else /* MACOSX */
ld->put(new CoreString("pid"), (int32)siginfo->si_pid);
ld->put(new CoreString("uid"), (int32)siginfo->si_uid);
ld->put(new CoreString("status"), (int32)siginfo->si_status);
ld->put(new CoreString("band"), (int32)siginfo->si_band);
#endif
cd->bless(true);
m->addParam(SafeItem(cd));
m_targetVM->postMessage(m);
}
void SignalReceiver::wakeup(void)
{
kill(getpid(), SIGCONT);
}
void BlockSignals()
{
sigset_t sigset;
sigfillset(&sigset);
pthread_sigmask(SIG_SETMASK, &sigset, NULL);
}
void UnblockSignals()
{
sigset_t sigset;
sigemptyset(&sigset);
pthread_sigmask(SIG_SETMASK, &sigset, NULL);
}
}
// vim: et ts=3 sw=3 :
/* end of signals_posix.cpp */
|
