TIMER_SETTIME(2)          NetBSD System Calls Manual          TIMER_SETTIME(2)


NAME
timer_settime, timer_gettime, timer_getoverrun -- process timer manipula- tion
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <time.h> int timer_settime(timer_t timerid, int flags, const struct itimerspec * restrict tim, struct itimerspec * restrict otim); int timer_gettime(timer_t timerid, struct itimerspec *tim); int timer_getoverrun(timer_t timerid);
DESCRIPTION
The timer_settime() sets the next expiration time of the timer with ID timerid to the it_value (see itimerspec(3)) specified in the tim argu- ment. If the value is 0, the timer is disarmed. If the argument otim is not NULL the old timer settings are returned. If the flags argument is set to TIMER_RELTIME then the expiration time is set to the value in nanoseconds specified in the tim argument from the time the call to timer_settime() was made. If the flags argument is set to TIMER_ABSTIME then the expiration time is set to be equal to the dif- ference between the clock associated with this timer, and the value spec- ified in the tim argument. If that time has already passed, then the call succeeds, and the expiration notification occurs. If the it_interval of the tim argument is non-zero, then the timer reloads upon expiration. The timer_gettime() function returns the current settings of the timer specified by the timerid argument in the tim argument. Only one notification event (signal) can be pending for a given timer and process. If a timer expires while the signal is still queued for deliv- ery, then the overrun counter for that timer is increased. The counter can store values up to DELAYTIMER_MAX. When the signal is finally deliv- ered to the process, then the timer_getoverrun() function can be used to retrieve the overrun counter for the timer specified in the timerid argu- ment.
NOTES
Expiration time values are always rounded up to the resolution of the timer, so a notification will never be sent before the requested time. Values returned in the otim argument of timer_settime() or in the tim argument of timer_gettime() are subject to the above rounding effect and might not exactly match the requested values by the user.
RETURN VALUES
If successful, the timer_gettime() and timer_settime() functions return 0, and the timer_getoverrun() function returns the expiration overrun count for the specified timer. Otherwise, the functions return -1, and set errno to indicate the error.
ERRORS
The timer_gettime(), timer_getoverrun(), and timer_settime() functions will fail if: [EINVAL] The argument timerid does not correspond to a valid timer id as returned by timer_create() or that timer id has been deleted by timer_delete(). The timer_settime() function will fail if: [EINVAL] A nanosecond field in the tim structure specified a value less than zero or greater than or equal to 10e9.
SEE ALSO
clock_gettime(2), timer_create(2), timer_delete(2)
STANDARDS
IEEE Std 1003.1b-1993 (``POSIX.1''), IEEE Std 1003.1i-1995 (``POSIX.1'') NetBSD 8.1 May 17, 2010 NetBSD 8.1

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