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-'\" t
-.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified Sat Jul 24 21:27:01 1993 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 14 Jun 2002, Michael Kerrisk <mtk.manpages@gmail.com>
-.\" 	Added notes on differences from other UNIX systems with respect to
-.\"	waited-for children.
-.TH clock 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-clock \- determine processor time
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <time.h>
-.PP
-.B clock_t clock(void);
-.fi
-.SH DESCRIPTION
-The
-.BR clock ()
-function returns an approximation of processor time used by the program.
-.SH RETURN VALUE
-The value returned is the CPU time used so far as a
-.IR clock_t ;
-to get the number of seconds used, divide by
-.BR CLOCKS_PER_SEC .
-If the processor time used is not available or its value cannot
-be represented, the function returns the value
-.IR (clock_t)\ \-1 .
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR clock ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-XSI requires that
-.B CLOCKS_PER_SEC
-equals 1000000 independent
-of the actual resolution.
-.PP
-On several other implementations,
-the value returned by
-.BR clock ()
-also includes the times of any children whose status has been
-collected via
-.BR wait (2)
-(or another wait-type call).
-Linux does not include the times of waited-for children in the
-value returned by
-.BR clock ().
-.\" I have seen this behavior on Irix 6.3, and the OSF/1, HP/UX, and
-.\" Solaris manual pages say that clock() also does this on those systems.
-.\" POSIX.1-2001 doesn't explicitly allow this, nor is there an
-.\" explicit prohibition. -- MTK
-The
-.BR times (2)
-function, which explicitly returns (separate) information about the
-caller and its children, may be preferable.
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C89.
-.PP
-In glibc 2.17 and earlier,
-.BR clock ()
-was implemented on top of
-.BR times (2).
-For improved accuracy,
-since glibc 2.18, it is implemented on top of
-.BR clock_gettime (2)
-(using the
-.B CLOCK_PROCESS_CPUTIME_ID
-clock).
-.SH NOTES
-The C standard allows for arbitrary values at the start of the program;
-subtract the value returned from a call to
-.BR clock ()
-at the start of the program to get maximum portability.
-.PP
-Note that the time can wrap around.
-On a 32-bit system where
-.B CLOCKS_PER_SEC
-equals 1000000 this function will return the same
-value approximately every 72 minutes.
-.SH SEE ALSO
-.BR clock_gettime (2),
-.BR getrusage (2),
-.BR times (2)