mirror of https://github.com/GnoConsortium/gno.git
129 lines
3.6 KiB
Groff
129 lines
3.6 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)times.3 8.1 (Berkeley) 6/4/93
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.\"
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.TH TIMES 2 "16 January 1997" GNO "System Calls"
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.SH NAME
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.BR times
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\- process times
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.SH SYNOPSIS
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.br
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#include <sys/times.h>
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.sp 1
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clock_t
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times (struct tms *tp);
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.SH DESCRIPTION
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The
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.BR times
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function returns the value of time in
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.BR CLK_TCK 's
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of a second since
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0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal
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Time.
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.LP
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It also fills in the structure pointed to by
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.I tp
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with time-accounting information.
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.LP
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The
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.I tms
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structure is defined as follows:
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.nf
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typedef struct {
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clock_t tms_utime;
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clock_t tms_stime;
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clock_t tms_cutime;
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clock_t tms_cstime;
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}
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.fi
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.LP
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The elements of this structure are defined as follows:
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.RS
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.IP \fItms_utime\fR
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The CPU time charged for the execution of user instructions.
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.IP \fItms_stime\fR
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The CPU time charged for execution by the system on behalf of
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the process.
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.IP \fItms_cutime\fR
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The sum of the
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.IR tms_utime ,
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and
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.IR tms_cutime
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of the child processes.
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.IP \fItms_cstime\fR
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The sum of the
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.IR tms_stime ,
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and
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.IR tms_cstime
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of the child processes.
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.RE
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.LP
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All times are in
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.BR CLK_TCK 's
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of a second.
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.LP
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The times of a terminated child process are included in the
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.I tms_cutime
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and
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.I tms_cstime
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elements of the parent when one of the
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.BR wait (2)
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functions returns the process ID of the terminated child to the parent.
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If an error occurs,
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.BR times
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returns the value
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.BR (clock_t)\-1 ,
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and sets errno to indicate the error.
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.SH ERRORS
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The
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.BR times
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function
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may fail and set the global variable
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.IR errno
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for any of the errors specified for the library
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routines
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.BR getrusage (2)
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and
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.BR gettimeofday (2).
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.SH SEE ALSO
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.BR time (1),
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.BR getrusage (2),
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.BR gettimeofday (2),
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.BR wait (2),
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.BR clocks (7)
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.SH STANDARDS
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The
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.BR times
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function
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conforms to POSIX 1003.1-88.
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