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 corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEclock_getcpuclockid — access a process CPU-time clock (ADVANCED REAL‐
int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);
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
The conditions under which one process has permission to obtain the
CPU-time clock ID of other processes are implementation-defined.
Upon successful completion, clock_getcpuclockid() shall return zero;
otherwise, an error number shall be returned to indicate the error.
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
The following sections are informative.
The clock_getcpuclockid() function is part of the Process CPU-Time
Clocks option and need not be provided on all implementations.
SEE ALSOclock_getres(), timer_create()
The Base Definitions volume of POSIX.1‐2008, <time.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal 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 Standard
is the referee document. The original Standard can be obtained online
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IEEE/The Open Group 2013 CLOCK_GETCPUCLOCKID(3P)