CLOCK_GETCPUCLOCKID(3)     POSIX Programmer's Manual    CLOCK_GETCPUCLOCKID(3)



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

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 .



IEEE/The Open Group                  2017               CLOCK_GETCPUCLOCKID(3)
