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(freebsd section 3)
man page for clock_getcpuclockid

CLOCK_GETCPUCLOCKID(3)					   BSD 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. SEE ALSO
clock_gettime(2) 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> BSD
August 21, 2012 BSD

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