mirror of https://github.com/mkerrisk/man-pages
131 lines
3.5 KiB
Groff
131 lines
3.5 KiB
Groff
.\" Copyright (c) 1993 Michael Haardt
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.\" (michael@moria.de)
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.\" Fri Apr 2 11:32:09 MET DST 1993
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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.\"
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.\" Modified Sat Jul 24 14:23:14 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Sun Oct 18 17:31:43 1998 by Andries Brouwer (aeb@cwi.nl)
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.\" 2008-06-23, mtk, minor rewrites, added some details
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.\"
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.TH FTIME 3 2020-02-09 "GNU" "Linux Programmer's Manual"
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.SH NAME
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ftime \- return date and time
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.SH SYNOPSIS
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.nf
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.B "#include <sys/timeb.h>"
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.PP
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.BI "int ftime(struct timeb *" tp );
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.fi
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.SH DESCRIPTION
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.BR NOTE :
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This function is no longer provided by the GNU C library.
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Use
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.BR clock_gettime (2)
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instead.
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.PP
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This function returns the current time as seconds and milliseconds
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since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
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The time is returned in
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.IR tp ,
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which is declared as follows:
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.PP
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.in +4n
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.EX
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struct timeb {
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time_t time;
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unsigned short millitm;
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short timezone;
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short dstflag;
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};
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.EE
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.in
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.PP
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Here \fItime\fP is the number of seconds since the Epoch,
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and \fImillitm\fP is the number of milliseconds since \fItime\fP
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seconds since the Epoch.
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The \fItimezone\fP field is the local timezone measured in minutes
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of time west of Greenwich (with a negative value indicating minutes
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east of Greenwich).
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The \fIdstflag\fP field
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is a flag that, if nonzero, indicates that Daylight Saving time
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applies locally during the appropriate part of the year.
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.PP
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POSIX.1-2001 says that the contents of the \fItimezone\fP and \fIdstflag\fP
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fields are unspecified; avoid relying on them.
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.SH RETURN VALUE
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This function always returns 0.
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(POSIX.1-2001 specifies, and some systems document, a \-1 error return.)
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.SH VERSIONS
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Starting with glibc 2.33, the
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.BR ftime ()
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function and the
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.I <sys/timeb.h>
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header have been removed.
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To support old binaries,
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glibc continues to provide a compatibility symbol for
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applications linked against glibc 2.32 and earlier.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR ftime ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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4.2BSD, POSIX.1-2001.
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POSIX.1-2008 removes the specification of
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.BR ftime ().
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.PP
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This function is obsolete.
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Don't use it.
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If the time in seconds
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suffices,
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.BR time (2)
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can be used;
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.BR gettimeofday (2)
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gives microseconds;
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.BR clock_gettime (2)
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gives nanoseconds but is not as widely available.
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.SH BUGS
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Early glibc2 is buggy and returns 0 in the
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.I millitm
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field;
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glibc 2.1.1 is correct again.
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.\" .SH HISTORY
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.\" The
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.\" .BR ftime ()
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.\" function appeared in 4.2BSD.
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.SH SEE ALSO
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.BR gettimeofday (2),
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.BR time (2)
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