jehanne/qa/lib/newlib/213-sigqueue.c

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#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <stdlib.h>
void catcher(int sig, siginfo_t *info, void *p) {
printf("Signal catcher called for signal %d from %d\n", sig, info->si_pid);
exit(1);
}
void timestamp(char *str) {
time_t t;
time(&t);
printf("The time %s is %s", str, ctime(&t));
}
void echoSIGUSR1(void){
int result;
struct sigaction sigact;
sigset_t waitset;
siginfo_t info;
union sigval v;
printf("CHILD pid %d\n", getpid());
v.sival_int = 0;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO;
sigact.sa_sigaction = catcher;
sigaction(SIGUSR1, &sigact, NULL);
sigemptyset(&waitset);
sigaddset(&waitset, SIGUSR1);
sigprocmask(SIG_BLOCK, &waitset, NULL);
while(v.sival_int < 5){
result = sigwaitinfo(&waitset, &info);
v.sival_int = 1 + info.si_value.sival_int;
printf("CHILD sigqueue %d to %d\n", v.sival_int, info.si_pid);
sigqueue(info.si_pid, result, v);
}
}
int main(int argc, char *argv[]) {
int result;
struct sigaction sigact;
sigset_t waitset;
siginfo_t info;
union sigval v;
pid_t child;
switch(child = fork()){
case 0:
echoSIGUSR1();
exit(0);
break;
case -1:
exit(1);
break;
default:
break;
}
printf("PARENT pid %d sleep(3)\n", getpid());
sleep(3);
v.sival_int = 0;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_SIGINFO;
sigact.sa_sigaction = catcher;
sigaction(SIGUSR1, &sigact, NULL);
sigemptyset(&waitset);
sigaddset(&waitset, SIGUSR1);
sigprocmask(SIG_BLOCK, &waitset, NULL);
result = SIGUSR1;
do{
printf("PARENT sigqueue %d\n", v.sival_int);
sigqueue(child, result, v);
result = sigwaitinfo(&waitset, &info);
v.sival_int = 1 + info.si_value.sival_int;
} while(v.sival_int < 5);
exit(0);
}