proc.5: Document 'subset' mount option.

[thirdparty/man-pages.git] / man3 / timegm.3

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-.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>
-.\"
-.\" %%%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-.\" manual page may be incorrect or out-of-date.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
-.\"
-.TH TIMEGM 3 2015-03-02 "GNU" "Linux Programmer's Manual"
-.SH NAME
-timegm, timelocal \- inverses of gmtime and localtime
-.SH SYNOPSIS
-.nf
-.B #include <time.h>
-.sp
-.BI "time_t timelocal(struct tm *" tm );
-.sp
-.BI "time_t timegm(struct tm *" tm );
-.sp
-.fi
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.BR timelocal (),
-.BR timegm ():
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    Glibc 2.19 and earlier:
-        _BSD_SOURCE || _SVID_SOURCE
-.SH DESCRIPTION
-The functions
-.BR timelocal ()
-and
-.BR timegm ()
-are the inverses of
-.BR localtime (3)
-and
-.BR gmtime (3).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbw21 lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.BR timelocal (),
-.BR timegm ()
-T}     Thread safety   MT-Safe env locale
-.TE
-.SH CONFORMING TO
-These functions are nonstandard GNU extensions
-that are also present on the BSDs.
-Avoid their use; see NOTES.
-.SH NOTES
-The
-.BR timelocal ()
-function is equivalent to the POSIX standard function
-.BR mktime (3).
-There is no reason to ever use it.
-.LP
-For a portable version of
-.BR timegm (),
-set the
-.B TZ
-environment variable to UTC, call
-.BR mktime (3)
-and restore the value of
-.BR TZ .
-Something like
-
-.in +4n
-.nf
-#include <time.h>
-#include <stdlib.h>
-
-time_t
-my_timegm(struct tm *tm)
-{
-    time_t ret;
-    char *tz;
-
-    tz = getenv("TZ");
-    if (tz)
-        tz = strdup(tz);
-    setenv("TZ", "", 1);
-    tzset();
-    ret = mktime(tm);
-    if (tz) {
-        setenv("TZ", tz, 1);
-        free(tz);
-    } else
-        unsetenv("TZ");
-    tzset();
-    return ret;
-}
-.fi
-.in
-.SH SEE ALSO
-.BR gmtime (3),
-.BR localtime (3),
-.BR mktime (3),
-.BR tzset (3)