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    Command:

    timer_gettime

    
    
    
    

    SYNOPSIS

           #include <time.h>
    
           int timer_settime(timer_t timerid, int flags,
                             const struct itimerspec *new_value,
                             struct itimerspec * old_value);
           int timer_gettime(timer_t timerid, struct itimerspec *curr_value);
    
           Link with -lrt.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           timer_settime(), timer_gettime(): _POSIX_C_SOURCE >= 199309L
    
    
    

    DESCRIPTION

           timer_settime() arms or disarms the timer identified by  timerid.   The
           new_value argument is pointer to an itimerspec structure that specifies
           the new initial value and the new interval for the timer.  The  itimer-
           spec structure is defined as follows:
    
               struct timespec {
                   time_t tv_sec;                /* Seconds */
                   long   tv_nsec;               /* Nanoseconds */
               };
    
               struct itimerspec {
                   struct timespec it_interval;  /* Timer interval */
                   struct timespec it_value;     /* Initial expiration */
               };
    
           Each  of  the  substructures  of the itimerspec structure is a timespec
           structure that allows a time value  to  be  specified  in  seconds  and
           nanoseconds.   These  time  values  are measured according to the clock
           that was specified when the timer was created by timer_create(2)
    
           If new_value->it_value specifies a nonzero value (i.e., either subfield
           is  nonzero),  then timer_settime() arms (starts) the timer, setting it
           to initially expire at the given  time.   (If  the  timer  was  already
           armed,    then    the   previous   settings   are   overwritten.)    If
           new_value->it_value specifies a zero value (i.e.,  both  subfields  are
           zero), then the timer is disarmed.
    
           The  new_value->it_interval field specifies the period of the timer, in
           seconds and nanoseconds.  If this field is nonzero, then each time that
           an  armed timer expires, the timer is reloaded from the value specified
           in new_value->it_interval.  If new_value->it_interval specifies a  zero
           value  then  the  timer  expires  just  once,  at the time specified by
           it_value.
    
           By   default,   the    initial    expiration    time    specified    in
           new_value->it_value  is interpreted relative to the current time on the
           return the previous interval of the timer  (in  old_value->it_interval)
           and  the  amount  of  time  until  the timer would previously have next
           expired (in old_value->it_value).
    
           timer_gettime() returns the time until next expiration, and the  inter-
           val,  for  the  timer specified by timerid, in the buffer pointed to by
           curr_value.  The time remaining until  the  next  timer  expiration  is
           returned  in  curr_value->it_value;  this  is  always a relative value,
           regardless of whether the TIMER_ABSTIME flag was used when  arming  the
           timer.  If the value returned in curr_value->it_value is zero, then the
           timer is  currently  disarmed.   The  timer  interval  is  returned  in
           curr_value->it_interval.       If     the     value     returned     in
           curr_value->it_interval is zero, then this is a "one-shot" timer.
    
    
    

    RETURN VALUE

           On success, timer_settime() and timer_gettime() return 0.  On error, -1
           is returned, and errno is set to indicate the error.
    
    
    

    ERRORS

           These functions may fail with the following errors:
    
           EFAULT new_value, old_value, or curr_value is not a valid pointer.
    
           EINVAL timerid is invalid.
    
           timer_settime() may fail with the following errors:
    
           EINVAL new_value.it_value is negative; or new_value.it_value.tv_nsec is
                  negative or greater than 999,999,999.
    
    
    

    VERSIONS

           These system calls are available since Linux 2.6.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    EXAMPLE

           See timer_create(2).
    
    
    

    SEE ALSO

           timer_create(2), timer_getoverrun(2), time(7)
    
    
    

    Linux 2012-10-15 TIMER_SETTIME(2)

    
    
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