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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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.1-2008, <time.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/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						       2013						   CLOCK_GETCPUCLOCKID(3P)