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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_getoverrun 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-timer_getoverrun \- get overrun count for a POSIX per-process timer
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.B  #include <time.h>
-.P
-.BI "int timer_getoverrun(timer_t " timerid );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR timer_getoverrun ():
-.nf
-    _POSIX_C_SOURCE >= 199309L
-.fi
-.SH DESCRIPTION
-.BR timer_getoverrun ()
-returns the "overrun count" for the timer referred to by
-.IR timerid .
-An application can use the overrun count to accurately calculate the number
-of timer expirations that would have occurred over a given time interval.
-Timer overruns can occur both when receiving expiration notifications
-via signals
-.RB ( SIGEV_SIGNAL ),
-and via threads
-.RB ( SIGEV_THREAD ).
-.P
-When expiration notifications are delivered via a signal,
-overruns can occur as follows.
-Regardless of whether or not a real-time signal is used for
-timer notifications,
-the system queues at most one signal per timer.
-(This is the behavior specified by POSIX.1.
-The alternative, queuing one signal for each timer expiration,
-could easily result in overflowing the allowed limits for
-queued signals on the system.)
-Because of system scheduling delays,
-or because the signal may be temporarily blocked,
-there can be a delay between the time when the notification
-signal is generated and the time when it
-is delivered (e.g., caught by a signal handler) or accepted (e.g., using
-.BR sigwaitinfo (2)).
-In this interval, further timer expirations may occur.
-The timer overrun count is the number of additional
-timer expirations that occurred between the time when the signal
-was generated and when it was delivered or accepted.
-.P
-Timer overruns can also occur when expiration notifications
-are delivered via invocation of a thread,
-since there may be an arbitrary delay between an expiration of the timer
-and the invocation of the notification thread,
-and in that delay interval, additional timer expirations may occur.
-.SH RETURN VALUE
-On success,
-.BR timer_getoverrun ()
-returns the overrun count of the specified timer;
-this count may be 0 if no overruns have occurred.
-On failure, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I timerid
-is not a valid timer ID.
-.SH VERSIONS
-When timer notifications are delivered via signals
-.RB ( SIGEV_SIGNAL ),
-on Linux it is also possible to obtain the overrun count via the
-.I si_overrun
-field of the
-.I siginfo_t
-structure (see
-.BR sigaction (2)).
-This allows an application to avoid the overhead of making
-a system call to obtain the overrun count,
-but is a nonportable extension to POSIX.1.
-.P
-POSIX.1 discusses timer overruns only in the context of
-timer notifications using signals.
-.\" FIXME . Austin bug filed, 11 Feb 09
-.\" https://www.austingroupbugs.net/view.php?id=95
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-Linux 2.6.
-POSIX.1-2001.
-.SH BUGS
-POSIX.1 specifies that if the timer overrun count
-is equal to or greater than an implementation-defined maximum,
-.BR DELAYTIMER_MAX ,
-then
-.BR timer_getoverrun ()
-should return
-.BR DELAYTIMER_MAX .
-However, before Linux 4.19,
-.\" http://bugzilla.kernel.org/show_bug.cgi?id=12665
-if the timer overrun value exceeds the maximum representable integer,
-the counter cycles, starting once more from low values.
-Since Linux 4.19,
-.\" commit 78c9c4dfbf8c04883941445a195276bb4bb92c76
-.BR timer_getoverrun ()
-returns
-.B DELAYTIMER_MAX
-(defined as
-.B INT_MAX
-in
-.IR <limits.h> )
-in this case (and the overrun value is reset to 0).
-.SH EXAMPLES
-See
-.BR timer_create (2).
-.SH SEE ALSO
-.BR clock_gettime (2),
-.BR sigaction (2),
-.BR signalfd (2),
-.BR sigwaitinfo (2),
-.BR timer_create (2),
-.BR timer_delete (2),
-.BR timer_settime (2),
-.BR signal (7),
-.BR time (7)