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#define _XOPEN_SOURCE 600 /* To use SA_RESTART and SA_RESETHAND */
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <pthread.h>
#include "observe-signal.h"
volatile unsigned int signal_received = 0;
static void signal_management_handler(int s)
{
signal_received |= 1 << s;
}
static void *signal_management_thread(void *PTR)
{
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
sigset_t blocked;
sigprocmask(SIG_SETMASK, 0, &blocked);
int s;
sigwait(&blocked, &s);
if(s != SIGSEGV) {
sigprocmask(SIG_UNBLOCK, &blocked, 0);
}
signal_management_handler(s);
return NULL;
}
int observe_signals(void)
{
sigset_t signals;
signal_received = 0;
sigemptyset(&signals);
sigaddset(&signals, SIGHUP);
sigaddset(&signals, SIGINT);
sigaddset(&signals, SIGQUIT);
sigaddset(&signals, SIGPIPE);
sigaddset(&signals, SIGTERM);
struct sigaction action;
action.sa_handler = signal_management_handler;
action.sa_mask = signals;
action.sa_flags = SA_RESTART | SA_RESETHAND;
int i;
for(i = 1; i < 32; i++) {
if(sigismember(&signals, i)) {
if(sigaction(i, &action, 0)) {
fprintf(stderr, "sigaction() failed: %d\n", i);
return -1;
}
}
}
if(pthread_sigmask(SIG_SETMASK, &signals, 0)) {
fprintf(stderr, "pthread_sigmask() failed: %s\n", strerror(errno));
return -1;
}
pthread_t signal_thread_id;
if(pthread_create(&signal_thread_id, 0, signal_management_thread, 0)) {
fprintf(stderr, "pthread_create() failed\n");
return -1;
}
pthread_detach(signal_thread_id);
return 0;
}
bool observe_end_of_process(void)
{
return(signal_received & 1<<SIGHUP ||
signal_received & 1<<SIGINT ||
signal_received & 1<<SIGQUIT ||
signal_received & 1<<SIGPIPE ||
signal_received & 1<<SIGTERM);
}
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