This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       The clock_getcpuclockid() function is part of the Process CPU-Time Clocks option and need not be provided
       on all implementations.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                           CLOCK_GETCPUCLOCKID(3POSIX)

       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 clock_id.

       The  conditions under which one process has permission to obtain the CPU-time clock ID of other processes
       are implementation-defined.

       The clock_getcpuclockid() function shall fail if:

       EPERM  The requesting process does not have permission to access the CPU-time clock for the process.

       The clock_getcpuclockid() function may fail if:

       ESRCH  No process can be found corresponding to the process specified by pid.

       Thefollowingsectionsareinformative.

       None.

       None.

       clock_getcpuclockid — access a process CPU-time clock (ADVANCEDREALTIME)

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

       None.

       Upon successful completion, clock_getcpuclockid() shall return zero; otherwise, an error number shall  be
       returned to indicate the error.

clock_getres(), timer_create()

       The Base Definitions volume of POSIX.1‐2017, <time.h>

       #include <time.h>

       int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);