Unix for Beginners
Unix Shell Programming
Advanced Unix
Unix Useful References
Unix Useful Resources
Selected Reading
Copyright © 2014 by tutorialspoint
|
time() - Unix, Linux System Call
Advertisements
NAME
time - get time in seconds
SYNOPSIS
#include <time.h>
time_t time(time_t *t); DESCRIPTION
time() returns the time since the Epoch
(00:00:00 UTC, January 1, 1970), measured in seconds.
If
t is non-NULL,
the return value is also stored in the memory pointed to by
t. RETURN VALUE
On success, the value of time in seconds since the Epoch is returned.
On error, ((time_t)-1) is returned, and errno is set
appropriately.
ERRORS
Tag | Description |
EFAULT |
t points outside your accessible address space.
|
NOTES
POSIX.1 defines
seconds since the Epoch as a value to be interpreted as the number of seconds between a
specified time and the Epoch, according to a formula for conversion
from UTC equivalent to conversion on the naive basis that leap
seconds are ignored and all years divisible by 4 are leap years. This
value is not the same as the actual number of seconds between the time
and the Epoch, because of leap seconds and because clocks are not
required to be synchronised to a standard reference. The intention is
that the interpretation of seconds since the Epoch values be
consistent; see POSIX.1 Annex B 2.2.2 for further rationale.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
Under 4.3BSD, this call is obsoleted by
gettimeofday(2).
POSIX does not specify any error conditions.
SEE ALSO
Advertisements
|
|
|
To Continue Learning Please Login
Login with Google