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

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 IEEE Std 1003.1-2001, <time.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003						    CLOCK_GETCPUCLOCKID(P)