96 lines
3.3 KiB
Groff
96 lines
3.3 KiB
Groff
.\" Copyright (c) 2012 David Xu <davidxu@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" Portions of this text are reprinted and reproduced in electronic form
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.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
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.\" Portable Operating System Interface (POSIX), The Open Group Base
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.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
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.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
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.\" event of any discrepancy between this version and the original IEEE and
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.\" The Open Group Standard, the original IEEE and The Open Group Standard is
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.\" the referee document. The original Standard can be obtained online at
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.\" http://www.opengroup.org/unix/online.html.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 21, 2012
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.Dt CLOCK_GETCPUCLOCKID 3
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.Os
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.Sh NAME
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.Nm clock_getcpuclockid
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.Nd access a process CPU-time clock
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In time.h
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.Ft int
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.Fn clock_getcpuclockid "pid_t pid" "clockid_t *clock_id"
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.Sh DESCRIPTION
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The
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.Fn clock_getcpuclockid
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returns the clock ID of the CPU-time clock of the process specified by
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.Fa pid .
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If the process described by
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.Fa pid
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exists and the calling process has permission, the clock ID of this
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clock will be returned in
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.Fa clock_id .
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.Pp
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If
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.Fa pid
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is zero, the
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.Fn clock_getcpuclockid
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function returns the clock ID of the CPU-time clock of the process
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making the call, in
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.Fa clock_id .
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn clock_getcpuclockid
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returns zero; otherwise, an error number is returned to indicate the
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error.
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.Sh ERRORS
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The clock_getcpuclockid() function will fail if:
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.Bl -tag -width Er
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.It Bq Er EPERM
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The requesting process does not have permission to access the CPU-time
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clock for the process.
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.It Bq Er ESRCH
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No process can be found corresponding to the process specified by
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.Fa pid .
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.El
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.Sh SEE ALSO
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.Xr clock_gettime 2
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.Sh STANDARDS
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The
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.Fn clock_getcpuclockid
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function conform to
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Fn clock_getcpuclockid
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function first appeared in
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.Fx 10.0 .
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.Sh AUTHORS
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.An David Xu Aq davidxu@FreeBSD.org
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