Manual browser: time(3)
|TIME(3)||Library Functions Manual||TIME(3)|
NAMEtime — get time of day
LIBRARYStandard C Library (libc, -lc)
DESCRIPTIONThe time() function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time.
A copy of the time value may be saved to the area indicated by the pointer tloc. If tloc is a NULL pointer, no value is stored.
Upon successful completion, time() returns the value of time. Otherwise a value of ((time_t) -1) is returned and the global variable errno is set to indicate the error.
ERRORSNo errors are defined.
STANDARDSThe time() function conforms to IEEE Std 1003.1-1990 (“POSIX.1”).
HISTORYA time() function appeared in Version 2 AT&T UNIX. It returned a 32-bit value measuring sixtieths of a second, leading to rollover every 2.26 years. In Version 6 AT&T UNIX, the precision of time() was changed to seconds, allowing 135.6 years between rollovers.
In NetBSD 6.0 the time_t type was changed to be 64 bits wide, including on 32-bit machines, making rollover a concern for the far distant future only. Note however that any code making the incorrect assumption that time_t is the same as long will fail on 32-bit machines in 2038.
|November 5, 2011||NetBSD 7.0|