PROLOG

       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.

NAME

       clock_getcpuclockid — access a process CPU-time clock (ADVANCED REALTIME)

SYNOPSIS

       #include <time.h>

       int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);

DESCRIPTION

       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.

RETURN VALUE

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

ERRORS

       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.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

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

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       clock_getres(), timer_create()

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

COPYRIGHT

       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 .