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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 dif-
       fer (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 pro-
       cess 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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(3P)