get time of day
() function returns the value of time
in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated
Universal Time (UTC).
A copy of the time value may be saved to the area indicated by the pointer
is a null pointer, no value is stored.
Upon successful completion,
the value of time. Otherwise a value of
)-1 is returned and the global
is set to indicate the error.
The following error codes may be set in errno
- An argument address referenced invalid memory.
() system call first appeared in
Version 1 AT&T UNIX
and used to return time
in sixtieths of a second in 32 bits, which was to guarantee a crisis every
2.26 years. Since Version 6 AT&T UNIX
() scale was changed to seconds,
extending the pre-crisis stagnation period up to a total of 68 years.