term% cat index.txt
TIME(2) System Calls Manual TIME(2)
time, nsec - time in seconds and nanoseconds since epoch
long time(long *tp)
Both time and nsec return the time since the epoch 00:00:00 GMT, Jan.
1, 1970. The return value of the former is in seconds and the latter
in nanoseconds. For time, if tp is not zero then *tp is also set to
Times from time should be stored in and treated as ulongs; this extends
the range of valid times into the year 2106.
Time simply calls nsec and returns the value divided by 1000000000.
Nsec is a system call. Previous implementations read /dev/bintime,
opening that file when first called, and maintaining a static file
descriptor; however, the maintenance of file descriptors in the face of
process forks is overly complex and prone to error.