Manual Pages  — CLOCK_GETCPUCLOCKID

clock_getcpuclockid – access a process CPU-time clock

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO STANDARDS HISTORY AUTHORS

Standard C Library (libc, -lc)

#include <time.h>

int
clock_getcpuclockid(pid_t pid, clockid_t *clock_id);

The clock_getcpuclockid() returns the clock ID of the CPU-time clock of the process specified by pid. If the process described by pid exists and the calling process has permission, the clock ID of this clock will be returned in clock_id.

If pid is zero, the clock_getcpuclockid() function returns the clock ID of the CPU-time clock of the process making the call, in clock_id.

Upon successful completion, clock_getcpuclockid() returns zero; otherwise, an error number is returned to indicate the error.

The clock_getcpuclockid() function will fail if:

[EPERM]
	The requesting process does not have permission to access the CPU-time clock for the process.
[ESRCH]
	No process can be found corresponding to the process specified by pid.

The clock_getcpuclockid() function conforms to IEEE Std 1003.1-2001 ("POSIX.1").

The clock_getcpuclockid() function first appeared in FreeBSD 10.0 .

David Xu <Mt davidxu@FreeBSD.org>