From 399644e47874bff147afb19c89228901ac39340e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 15 Apr 2024 21:40:15 +0200 Subject: Adding upstream version 6.05.01. Signed-off-by: Daniel Baumann --- man3/difftime.3 | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 man3/difftime.3 (limited to 'man3/difftime.3') diff --git a/man3/difftime.3 b/man3/difftime.3 new file mode 100644 index 0000000..e1cd34f --- /dev/null +++ b/man3/difftime.3 @@ -0,0 +1,70 @@ +'\" t +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" 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 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +difftime \- calculate time difference +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include +.PP +.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 +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR difftime () +T} Thread safety MT-Safe +.TE +.sp 1 +.SH STANDARDS +C11, POSIX.1-2008. +.SH HISTORY +POSIX.1-2001, C89, SVr4, 4.3BSD. +.SH NOTES +On a POSIX system, +.I time_t +is an arithmetic type, and one could just +define +.PP +.in +4n +.EX +#define my_difftime(t1,t0) (double)(t1 \- t0) +.EE +.in +.PP +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) -- cgit v1.2.3