trusty (3) clock_getcpuclockid.3posix.gz

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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>


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