CODEWITHSUNDEEP
clinuxtimermsgrcv
prashant mavadiya
prashant mavadiya

Reputation: 196

Interrupted system call

I have more then three timer running from main as given below, and I have defined one message queue in main section. My timer's expiration time in 10(max). Why, when timer expires "msgrcv" gives error like "Interrupted system call"?

    timer_t timer1 = create_timer(TT_SIGUSR1);
    install_sighandler(TT_SIGUSR1, signal_handler);
    set_timer(timer1, TIME_INTERVAL_1);
     -
      -
       -

    flag = IPC_CREAT | 0666;
    key = 1234;

    msgqid = msgget(key,flag);
    printf("msgqid = %d\n",msgqid);

    while (1)
    {
            msgsz = msgrcv(msgqid, &sendMsg, sizeof(sendMsg), 0,0);
            perror("prashant");

            sleep(1);
    }
    return 0;

Upvotes: 0

Views: 6448

Answers (1)

cnicutar
cnicutar

Reputation: 182649

Because you probably setup your timer to send you a signal when it expires. Receiving a signal while blocked on certain system calls will make said system calls fail with errno = EINTR.

The msgrcv() function shall fail if:

    [EINTR]
    The msgrcv() function was interrupted by a signal.

Upvotes: 2

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