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.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH PR_SET_TIMING 2const 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
PR_SET_TIMING
\-
set the process timing mode
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <linux/prctl.h>" " /* Definition of " PR_* " constants */"
.B #include <sys/prctl.h>
.P
.BI "int prctl(PR_SET_TIMING, long " mode );
.fi
.SH DESCRIPTION
Set whether to use (normal, traditional) statistical process timing or
accurate timestamp-based process timing, by passing
.B PR_TIMING_STATISTICAL
or
.B PR_TIMING_TIMESTAMP
to
.IR mode .
.SH RETURN VALUE
On success,
0 is returned.
On error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
.I mode
is not
.BR PR_TIMING_STATISTICAL .
.SH STANDARDS
Linux.
.SH HISTORY
Linux 2.6.0.
.\" Precisely: Linux 2.6.0-test4
.SH CAVEATS
.B PR_TIMING_TIMESTAMP
is not currently implemented
(attempting to set this mode will yield the error
.BR EINVAL ).
.\" PR_TIMING_TIMESTAMP doesn't do anything in Linux 2.6.26-rc8,
.\" and looking at the patch history, it appears
.\" that it never did anything.
.SH SEE ALSO
.BR prctl (2),
.BR PR_GET_TIMING (2const)
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