ftime(3) - Linux manual page (original) (raw)

ftime(3) Library Functions Manual ftime(3)

NAME top

   ftime - return date and time

LIBRARY top

   Standard C library (_libc_, _-lc_)

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)](../man2/clock%5Fgettime.2.html) 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.)

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **ftime**()                              │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   None.

HISTORY top

   Removed in glibc 2.33.  4.2BSD, POSIX.1-2001.  Removed in
   POSIX.1-2008.

   This function is obsolete.  Don't use it.  If the time in seconds
   suffices, [time(2)](../man2/time.2.html) can be used; [gettimeofday(2)](../man2/gettimeofday.2.html) gives microseconds;
   [clock_gettime(2)](../man2/clock%5Fgettime.2.html) 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)](../man2/gettimeofday.2.html), [time(2)](../man2/time.2.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 ftime(3)

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