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-.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
-.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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-.\"
-.Dd July 15, 2016
-.Dt TIMER_CREATE 2
-.Os
-.Sh NAME
-.Nm timer_create
-.Nd "create a per-process timer (REALTIME)"
-.Sh LIBRARY
-.Lb librt
-.Sh SYNOPSIS
-.In time.h
-.In signal.h
-.Ft int
-.Fo timer_create
-.Fa "clockid_t clockid" "struct sigevent *restrict evp"
-.Fa "timer_t *restrict timerid"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn timer_create
-system call creates a per-process timer using the specified clock,
-.Fa clock_id ,
-as the timing base.
-The
-.Fn timer_create
-system call returns, in the location referenced by
-.Fa timerid ,
-a timer ID of type
-.Vt timer_t
-used to identify the timer in timer requests.
-This timer ID is unique within the calling process until the timer is deleted.
-The particular clock,
-.Fa clock_id ,
-is defined in
-.In time.h .
-The timer whose ID is returned is in a disarmed state upon return from
-.Fn timer_create .
-.Pp
-The
-.Fa evp
-argument, if
-.Pf non- Dv NULL ,
-points to a
-.Vt sigevent
-structure.
-This structure,
-allocated by the application, defines the asynchronous notification to occur
-when the timer expires.
-.Pp
-If
-.Fa evp->sigev_notify
-is
-.Dv SIGEV_SIGNO
-or
-.Dv SIGEV_THREAD_ID ,
-the signal specified in
-.Fa evp->sigev_signo
-will be sent to the calling process
-.Pq Dv SIGEV_SIGNO
-or to the thread whose LWP ID is
-.Fa evp->sigev_notify_thread_id
-.Pq Dv SIGEV_THREAD_ID .
-The information for the queued signal will include:
-.Bl -column ".Va si_value"
-.It Sy Member Ta Sy Value
-.It Va si_code Ta Dv SI_TIMER
-.It Va si_value Ta
-the value stored in
-.Fa evp->sigev_value
-.It Va si_timerid Ta timer ID
-.It Va si_overrun Ta timer overrun count
-.It Va si_errno Ta
-If timer overrun is
-.Brq Dv DELAYTIMER_MAX ,
-an error code defined in
-.In errno.h
-.El
-.Pp
-If the
-.Fa evp
-argument is
-.Dv NULL ,
-the effect is as if the
-.Fa evp
-argument pointed to a
-.Vt sigevent
-structure with the
-.Va sigev_notify
-member having the value
-.Dv SIGEV_SIGNAL ,
-the
-.Va sigev_signo
-having a default signal number
-.Pq Dv SIGALRM ,
-and the
-.Va sigev_value
-member having
-the value of the timer ID.
-.Pp
-This implementation supports a
-.Fa clock_id
-of
-.Dv CLOCK_REALTIME
-or
-.Dv CLOCK_MONOTONIC .
-.Pp
-If
-.Fa evp->sigev_notify
-is
-.Dv SIGEV_THREAD
-and
-.Fa sev->sigev_notify_attributes
-is not
-.Dv NULL ,
-if the attribute pointed to by
-.Fa sev->sigev_notify_attributes
-has
-a thread stack address specified by a call to
-.Fn pthread_attr_setstack
-or
-.Fn pthread_attr_setstackaddr ,
-the results are unspecified if the signal is generated more than once.
-.Sh RETURN VALUES
-If the call succeeds,
-.Fn timer_create
-returns zero and updates the location referenced by
-.Fa timerid
-to a
-.Vt timer_t ,
-which can be passed to the per-process timer calls.
-If an error
-occurs, the system call returns a value of \-1
-and the global variable
-.Va errno
-is set to indicate the
-error.
-The value of
-.Fa timerid
-is undefined if an error occurs.
-.Sh ERRORS
-The
-.Fn timer_create
-system call
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EAGAIN
-The calling process has already created all of the timers it is allowed by
-this implementation.
-.It Bq Er EINVAL
-The specified clock ID is not supported.
-.It Bq Er EINVAL
-The specified asynchronous notification method is not supported.
-.It Bq Er EFAULT
-Any arguments point outside the allocated address space or there is a
-memory protection fault.
-.El
-.Sh SEE ALSO
-.Xr clock_getres 2 ,
-.Xr timer_delete 2 ,
-.Xr timer_getoverrun 2 ,
-.Xr sigevent 3 ,
-.Xr siginfo 3
-.Sh STANDARDS
-The
-.Fn timer_create
-system call conforms to
-.St -p1003.1-2004 .
-.Sh HISTORY
-Support for
-.Tn POSIX
-per-process timer first appeared in
-.Fx 7.0 .