ftime(3) — Linux manual page


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 deprecated, and will be removed in a future
       version of 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 Green‐
       wich).  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

       │Interface Attribute     Value   │
       │ftime()   │ Thread safety │ MT-Safe │

CONFORMING TO         top

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

       This function is obsolete.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 5.09 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

GNU                              2020-02-09                         FTIME(3)

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