#define _POSIX_C_SOURCE 200809L

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main() {

    sigset_t set;
    sigemptyset( &set );
    sigaddset( &set, SIGUSR1 );
    sigprocmask( SIG_BLOCK, &set, NULL );

    union sigval value;
    value.sival_int = 77;
    sigqueue( getpid(), SIGUSR1, value );

    siginfo_t info;
    sigwaitinfo( &set, &info );

    printf( "Valeur reçue : %d\n", info.si_value.sival_int );
    return EXIT_SUCCESS;
}