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clock(3c)
clock(3C) Standard C Library Functions clock(3C)
NAME
clock - report CPU time used
SYNOPSIS
#include <time.h>
clock_t clock(void);
DESCRIPTION
The clock() function returns the amount of CPU time (in microseconds)
used since the first call to clock() in the calling process. The time
reported is the sum of the user and system times of the calling process
and its terminated child processes for which it has executed the
wait(3C) function, the pclose(3C) function, or the system(3C) function.
RETURN VALUES
Dividing the value returned by clock() by the constant CLOCKS_PER_SEC,
defined in the <time.h> header, will give the time in seconds. If the
process time used is not available or cannot be represented, clock re‐
turns the value (clock_t) −1.
USAGE
The value returned by clock() is defined in microseconds for compati‐
bility with systems that have CPU clocks with much higher resolution.
This value is a 32-bit value in 32-bit code, and so will wrap around
after accumulating only 2147 seconds of CPU time (about 36 minutes).
The returned value is a 64-bit value in 64-bit code, and does not suf‐
fer from the same short overflow period.
In either case, but particularly for 32-bit code, the use of times(2)
or clock_gettime(3C) with CLOCK_PROCESS_CPUTIME_ID is recommended over
having to handle wrap around with this function.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
times(2), clock_gettime(3C), popen(3C), system(3C), wait(3C), attrib‐
utes(7), standards(7)
HISTORY
The clock() function has been included in all Sun and Oracle releases
of Solaris.
Oracle Solaris 11.4 27 Aug 2025 clock(3C)