alarm pipe

This is a discussion on alarm pipe within the C Programming forums, part of the General Programming Boards category; hi, #include<signal.h> #include<stdio.h> void handler(); int alarmflag=0; { signal(14,handler); alarm(3); while(!alarmflag) { pause(); printf("signal received\n"); } printf("loop ends"); } void ...

  1. #1
    Registered User jacktibet's Avatar
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    Mar 2003
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    alarm pipe

    hi,
    #include<signal.h>
    #include<stdio.h>

    void handler();
    int alarmflag=0;

    {
    signal(14,handler);
    alarm(3);
    while(!alarmflag)
    {
    pause();
    printf("signal received\n");
    }
    printf("loop ends");
    }

    void handler()
    {
    printf("an alarm signal was received\n");
    alarmflag=1;
    }

    here, what is alarm? what is the function handler, it
    is a new process or not? when it will be run. please tell me
    thank you very much.
    Code:
    ss
    Jack

  2. #2
    Registered User
    Join Date
    Jul 2003
    Posts
    18
    Alarms are used in conjunction with signals to determine if an event has occured or not.

    If a signal triggers an event then it updates the alarmflag variable and the function alarm is used for this purpose i guess.

    Based on the alarmflag value set your program could take the appropriate action required.

    Hope this sufficies.

  3. #3
    Registered User jacktibet's Avatar
    Join Date
    Mar 2003
    Posts
    18
    is the function handler a process?
    when it will be run ?
    Jack

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