The clock_getcpuclockid() function shall return 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 shall be returned in clock_id.
If pid is zero, the clock_getcpuclockid() function shall return
the clock ID of the CPU-time clock of the process making the call, in
The conditions under which one process has permission to obtain the CPU-time
clock ID of other processes are implementation-defined.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html