TIMER_CREATE

Section: Linux Programmer's Guide (2)
Updated: 2004-March-12
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NAME

timer_create - Create a POSIX.1b interval timer clock

SYNOPSIS

: long sys_timer_create (clockid_t which_clock, struct sigevent *timer_event_spec, timer_t *created_timer_id);

DESCRIPTION

timer_create creates a POSIX.1b interval timer, pointed to by created_timer_id, using the which_clock format. The timer_event_spec points to a sigevent structure if non-NULL. The sigevent structure defines the asynchronous notification that occurs when the timer expires.

The values that clockid_t currently supports for POSIX.1b timers, as defined in include/linux.time.h, are:

CLOCK_REALTIME: Systemwide realtime clock.
CLOCK_MONOTONIC: Represents monotonic time. Cannot be set.
CLOCK_PROCESS_CPUTIME_ID: High resolution per-process timer.
CLOCK_THREAD_CPUTIME_ID: Thread-specific timer.
CLOCK_REALTIME_HR: High resolution version of CLOCK_REALTIME.
CLOCK_MONOTONIC_HR: High resolution version of CLOCK_MONOTONIC.

RETURN VALUE

timer_create returns 0 on success and updates the created_timer_id value; otherwise, it returns one of the errors listed in the "Errors" section.

ERRORS

-EINVAL: An invalid which_clock value was specified.
-EAGAIN: The system could not process the request.
-EFAULT: An invalid timer_event_spec value was specified.

AUTHOR

Niki Rahimi