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[linuxjm/LDP_man-pages.git] / original / man3 / difftime.3

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-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 19:48:17 1993 by Rik Faith (faith@cs.unc.edu)
-.TH DIFFTIME 3  2013-10-28 "GNU" "Linux Programmer's Manual"
-.SH NAME
-difftime \- calculate time difference
-.SH SYNOPSIS
-.nf
-.B #include <time.h>
-.sp
-.BI "double difftime(time_t " time1 ", time_t " time0 );
-.fi
-.SH DESCRIPTION
-The
-.BR difftime ()
-function returns the number of seconds elapsed
-between time \fItime1\fP and time \fItime0\fP, represented as a
-.IR double .
-Each of the times is specified in calendar time, which means its
-value is a measurement (in seconds) relative to the
-Epoch, 1970-01-01 00:00:00 +0000 (UTC).
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR difftime ()
-function is thread-safe.
-.SH CONFORMING TO
-SVr4, 4.3BSD, C89, C99.
-.SH NOTES
-On a POSIX system,
-.I time_t
-is an arithmetic type, and one could just
-define
-.RS
-.nf
-
-#define difftime(t1,t0) (double)(t1 \- t0)
-
-.fi
-.RE
-when the possible overflow in the subtraction is not a concern.
-.SH SEE ALSO
-.BR date (1),
-.BR gettimeofday (2),
-.BR time (2),
-.BR ctime (3),
-.BR gmtime (3),
-.BR localtime (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.