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Asked: 2026-06-02T23:38:53+00:00

I’m using the setitimer function in order to set an ITIMER_VIRTUAL timer, using a

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I’m using the setitimer function in order to set an ITIMER_VIRTUAL timer, using a pointer to some struct itimerval. this is a virtual timer (runs only when the process has control) and sends a SIGVTALRM signal the moment it reaches zero.
My question is – after calling setitimer, is there any way to disable an active timer, so this signal would not go off when the timer finishes? or is the only way to ignore it now would be setting a SIGNAL MASK ordering the program to ignore this signal?

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1 Answer

  1. Editorial Team

    According to the man page, just call setitimer() again, with the same timer handle and the it_value field of the itimerval struct set to zero.

    You can disable it immeditately:

    Setting it_value to 0 shall disable a timer, regardless of the value of it_interval.

    Or after it next fires:

    Setting it_interval to 0 shall disable a timer after its next expiration (assuming it_value is non-zero).

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