#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <signal.h>

void
gottimeout(int signal) {
}

int
main(void) {
    int timeout = 5;
    int msgqid;
    char buf[100];

    msgqid = msgget(1234, IPC_CREAT);
    signal(SIGALRM, gottimeout);

    while(1) {
    alarm(timeout);
        if(msgrcv(msgqid, buf, sizeof(buf), 0, 0) == -1) {
        if(errno == EINTR) {
        printf("eintr!\n");
        } else {
        perror("msgrcv");
        return 1;
        }
    }
    }
    return 0;
}