CLOCK_GETCPUCLOCKID(3) |
FreeBSD Library Functions Manual |
CLOCK_GETCPUCLOCKID(3) |
NAME
clock_getcpuclockid —
access a process CPU-time clock
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include < time.h>
int
clock_getcpuclockid( pid_t pid, clockid_t *clock_id);
DESCRIPTION
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.
RETURN VALUES
Upon successful completion,
clock_getcpuclockid() returns zero; otherwise, an error number is returned to indicate the error.
ERRORS
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.
STANDARDS
The
clock_getcpuclockid() function conform to IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The
clock_getcpuclockid() function first appeared in
FreeBSD 10.0.
AUTHORS
David Xu <davidxu@FreeBSD.org>