ftime(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON

FTIME(3)                Linux Programmer's Manual               FTIME(3)

NAME         top

       ftime - return date and time

SYNOPSIS         top

       #include <sys/timeb.h>

       int ftime(struct timeb *tp);

DESCRIPTION         top

       NOTE: This function is no longer provided by the GNU C library.
       Use clock_gettime(2) instead.

       This function returns the current time as seconds and
       milliseconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
       The time is returned in tp, which is declared as follows:

           struct timeb {
               time_t         time;
               unsigned short millitm;
               short          timezone;
               short          dstflag;
           };

       Here time is the number of seconds since the Epoch, and millitm
       is the number of milliseconds since time seconds since the Epoch.
       The timezone field is the local timezone measured in minutes of
       time west of Greenwich (with a negative value indicating minutes
       east of Greenwich).  The dstflag field is a flag that, if
       nonzero, indicates that Daylight Saving time applies locally
       during the appropriate part of the year.

       POSIX.1-2001 says that the contents of the timezone and dstflag
       fields are unspecified; avoid relying on them.

RETURN VALUE         top

       This function always returns 0.  (POSIX.1-2001 specifies, and
       some systems document, a -1 error return.)

VERSIONS         top

       Starting with glibc 2.33, the ftime() function and the
       <sys/timeb.h> header have been removed.  To support old binaries,
       glibc continues to provide a compatibility symbol for
       applications linked against glibc 2.32 and earlier.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             Attribute     Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │ftime()                               │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       4.2BSD, POSIX.1-2001.  POSIX.1-2008 removes the specification of
       ftime().

       This function is obsolete.  Don't use it.  If the time in seconds
       suffices, time(2) can be used; gettimeofday(2) gives
       microseconds; clock_gettime(2) gives nanoseconds but is not as
       widely available.

BUGS         top

       Early glibc2 is buggy and returns 0 in the millitm field; glibc
       2.1.1 is correct again.

SEE ALSO         top

       gettimeofday(2), time(2)

COLOPHON         top

       This page is part of release 5.11 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                            2021-03-22                       FTIME(3)

Pages that refer to this page: clock_getres(2)gettimeofday(2)syscalls(2)time(2)unimplemented(2)