#include <libc.h>

 long time(long *tp)

 vlong nsec(void)
 DESCRIPTION
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 the answer.

Times from
 time should be stored in and treated as
 ulong s; 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.
 SOURCE
 /sys/src/libc/9sys/time.c 

 /sys/src/libc/9syscall 
 SEE ALSO
 cputime (2),  cons (3) 
 DIAGNOSTICS
Sets
 errstr .