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-.\" Copyright (c) 2009 Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH timer_settime 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-timer_settime, timer_gettime \- arm/disarm and fetch
-state of POSIX per-process timer
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.B  #include <time.h>
-.P
-.BI "int timer_gettime(timer_t " timerid ", struct itimerspec *" curr_value );
-.BI "int timer_settime(timer_t " timerid ", int " flags ,
-.BI "                  const struct itimerspec *restrict " new_value ,
-.BI "                  struct itimerspec *_Nullable restrict " old_value );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR timer_settime (),
-.BR timer_gettime ():
-.nf
-    _POSIX_C_SOURCE >= 199309L
-.fi
-.SH DESCRIPTION
-.BR timer_settime ()
-arms or disarms the timer identified by
-.IR timerid .
-The
-.I new_value
-argument is pointer to an
-.I itimerspec
-structure that specifies the new initial value and
-the new interval for the timer.
-The
-.I itimerspec
-structure is described in
-.BR itimerspec (3type).
-.P
-Each of the substructures of the
-.I itimerspec
-structure is a
-.BR timespec (3)
-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
-.BR timer_create (2).
-.P
-If
-.I new_value\->it_value
-specifies a nonzero value (i.e., either subfield is nonzero), then
-.BR 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
-.I new_value\->it_value
-specifies a zero value
-(i.e., both subfields are zero),
-then the timer is disarmed.
-.P
-The
-.I 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
-.IR new_value\->it_interval .
-If
-.I new_value\->it_interval
-specifies a zero value,
-then the timer expires just once, at the time specified by
-.IR it_value .
-.P
-By default, the initial expiration time specified in
-.I new_value\->it_value
-is interpreted relative to the current time on the timer's
-clock at the time of the call.
-This can be modified by specifying
-.B TIMER_ABSTIME
-in
-.IR flags ,
-in which case
-.I new_value\->it_value
-is interpreted as an absolute value as measured on the timer's clock;
-that is, the timer will expire when the clock value reaches the
-value specified by
-.IR new_value\->it_value .
-If the specified absolute time has already passed,
-then the timer expires immediately,
-and the overrun count (see
-.BR timer_getoverrun (2))
-will be set correctly.
-.\" By experiment: the overrun count is set correctly, for CLOCK_REALTIME.
-.P
-If the value of the
-.B CLOCK_REALTIME
-clock is adjusted while an absolute timer based on that clock is armed,
-then the expiration of the timer will be appropriately adjusted.
-Adjustments to the
-.B CLOCK_REALTIME
-clock have no effect on relative timers based on that clock.
-.\" Similar remarks might apply with respect to process and thread CPU time
-.\" clocks, but these clocks are not currently (2.6.28) settable on Linux.
-.P
-If
-.I old_value
-is not NULL, then it points to a buffer
-that is used to return the previous interval of the timer (in
-.IR old_value\->it_interval )
-and the amount of time until the timer
-would previously have next expired (in
-.IR old_value\->it_value ).
-.P
-.BR timer_gettime ()
-returns the time until next expiration, and the interval,
-for the timer specified by
-.IR timerid ,
-in the buffer pointed to by
-.IR curr_value .
-The time remaining until the next timer expiration is returned in
-.IR curr_value\->it_value ;
-this is always a relative value, regardless of whether the
-.B TIMER_ABSTIME
-flag was used when arming the timer.
-If the value returned in
-.I curr_value\->it_value
-is zero, then the timer is currently disarmed.
-The timer interval is returned in
-.IR curr_value\->it_interval .
-If the value returned in
-.I curr_value\->it_interval
-is zero, then this is a "one-shot" timer.
-.SH RETURN VALUE
-On success,
-.BR timer_settime ()
-and
-.BR timer_gettime ()
-return 0.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-These functions may fail with the following errors:
-.TP
-.B EFAULT
-.IR new_value ,
-.IR old_value ,
-or
-.I curr_value
-is not a valid pointer.
-.TP
-.B EINVAL
-.I timerid
-is invalid.
-.\" FIXME . eventually: invalid value in flags
-.P
-.BR timer_settime ()
-may fail with the following errors:
-.TP
-.B EINVAL
-.I new_value.it_value
-is negative; or
-.I new_value.it_value.tv_nsec
-is negative or greater than 999,999,999.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-Linux 2.6.
-POSIX.1-2001.
-.SH EXAMPLES
-See
-.BR timer_create (2).
-.SH SEE ALSO
-.BR timer_create (2),
-.BR timer_getoverrun (2),
-.BR timespec (3),
-.BR time (7)