1CLOCK_GETCPUCLOCKID(3P)    POSIX Programmer's Manual   CLOCK_GETCPUCLOCKID(3P)
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PROLOG

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

12       clock_getcpuclockid — access a process CPU-time clock  (ADVANCED  REAL‐
13       TIME)
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SYNOPSIS

16       #include <time.h>
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18       int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);
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DESCRIPTION

21       The  clock_getcpuclockid()  function  shall  return the clock ID of the
22       CPU-time clock of  the  process  specified  by  pid.   If  the  process
23       described  by  pid  exists  and the calling process has permission, the
24       clock ID of this clock shall be returned in clock_id.
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26       If pid is zero, the clock_getcpuclockid()  function  shall  return  the
27       clock  ID  of  the  CPU-time  clock  of the process making the call, in
28       clock_id.
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30       The conditions under which one process has  permission  to  obtain  the
31       CPU-time clock ID of other processes are implementation-defined.
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RETURN VALUE

34       Upon  successful  completion,  clock_getcpuclockid() shall return zero;
35       otherwise, an error number shall be returned to indicate the error.
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ERRORS

38       The clock_getcpuclockid() function shall fail if:
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40       EPERM  The requesting process does not have permission  to  access  the
41              CPU-time clock for the process.
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43       The clock_getcpuclockid() function may fail if:
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45       ESRCH  No  process  can be found corresponding to the process specified
46              by pid.
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48       The following sections are informative.
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EXAMPLES

51       None.
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APPLICATION USAGE

54       The clock_getcpuclockid() function is  part  of  the  Process  CPU-Time
55       Clocks option and need not be provided on all implementations.
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RATIONALE

58       None.
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FUTURE DIRECTIONS

61       None.
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SEE ALSO

64       clock_getres(), timer_create()
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66       The Base Definitions volume of POSIX.1‐2017, <time.h>
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69       Portions  of  this text are reprinted and reproduced in electronic form
70       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
71       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
72       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
73       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
74       event of any discrepancy between this version and the original IEEE and
75       The  Open Group Standard, the original IEEE and The Open Group Standard
76       is the referee document. The original Standard can be  obtained  online
77       at http://www.opengroup.org/unix/online.html .
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79       Any  typographical  or  formatting  errors that appear in this page are
80       most likely to have been introduced during the conversion of the source
81       files  to  man page format. To report such errors, see https://www.ker‐
82       nel.org/doc/man-pages/reporting_bugs.html .
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86IEEE/The Open Group                  2017              CLOCK_GETCPUCLOCKID(3P)
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