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FTIME(3) Linux Programmer's Manual FTIME(3)
NAME
ftime - return date and time
SYNOPSIS
#include <sys/timeb.h>
int ftime(struct timeb *tp);
DESCRIPTION
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 de‐
clared 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 lo‐
cal 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
This function always returns 0. (POSIX.1-2001 specifies, and some systems document, a -1 error return.)
VERSIONS
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 compatibil‐
ity symbol for applications linked against glibc 2.32 and earlier.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│ftime() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
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This function is obsolete.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
Early glibc2 is buggy and returns 0 in the millitm field; glibc 2.1.1 is correct again.
SEE ALSO
gettimeofday(2), time(2)
GNU 2021-03-22 FTIME(3)