The timer interval is returned inĬurr_value->it_interval. If the value returned inĬurr_value->it_value is zero, then the timer is currentlyĭisarmed. Timer expiration is returned in curr_value->it_value this isĪlways a relative value, regardless of whether the TIMER_ABSTIMEįlag was used when arming the timer. Interval, for the timer specified by timerid, in the buffer Timer_gettime() returns the time until next expiration, and the Would previously have next expired (in old_value->it_value). Old_value->it_interval) and the amount of time until the timer To return the previous interval of the timer (in If old_value is not NULL, then it points to a buffer that is used Adjustments to theĬLOCK_REALTIME clock have no effect on relative timers based on Of the timer will be appropriately adjusted. If the value of the CLOCK_REALTIME clock is adjusted while anĪbsolute timer based on that clock is armed, then the expiration (see timer_getoverrun(2)) will be set correctly. Passed, then the timer expires immediately, and the overrun count If the specified absolute time has already When the clock value reaches the value specified by Measured on the timer's clock that is, the timer will expire New_value->it_value is interpreted as an absolute value as Modified by specifying TIMER_ABSTIME in flags, in which case On the timer's clock at the time of the call. New_value->it_value is interpreted relative to the current time New_value->it_interval specifies a zero value, then the timerĮxpires just once, at the time specified by it_value.īy default, the initial expiration time specified in Then each time that an armed timer expires, the timer is reloadedįrom the value specified in new_value->it_interval. The new_value->it_interval field specifies the period of the (i.e., both subfields are zero), then the timer is disarmed. Overwritten.) If new_value->it_value specifies a zero value Timer was already armed, then the previous settings are Timer, setting it to initially expire at the given time. Subfield is nonzero), then timer_settime() arms (starts) the If new_value->it_value specifies a nonzero value (i.e., either These time values are measuredĪccording to the clock that was specified when the timer was Timespec structure that allows a time value to be specified in Struct timespec it_value /* Initial expiration */Įach of the substructures of the itimerspec structure is a Struct timespec it_interval /* Timer interval */ The itimerspec structure is defined as follows: Specifies the new initial value and the new interval for the The new_value argument is pointer to an itimerspec structure that SYNOPSIS top #include int timer_settime(timer_t timerid, int flags, const struct itimerspec *restrict new_value, struct itimerspec *restrict old_value ) int timer_gettime(timer_t timerid, struct itimerspec * curr_value ) įeature Test Macro Requirements for glibc (seeĭESCRIPTION top timer_settime() arms or disarms the timer identified by timerid.
Timer_settime, timer_gettime - arm/disarm and fetch state of
Set as timer manual#
TIMER_SETTIME(2) Linux Programmer's Manual TIMER_SETTIME(2) NAME top
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