.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH PR_GET_TSC 2const 2025-08-24 "Linux man-pages 6.16"
.SH NAME
PR_GET_TSC
\-
get wether the timestamp counter can be read
.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_GET_TSC, int *" flag );
.fi
.SH DESCRIPTION
Return the state of the flag determining whether the timestamp counter
can be read,
in the location pointed to by
.IR flag .
.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 EFAULT
.I flag
is an invalid address.
.SH STANDARDS
Linux.
x86 only.
.SH HISTORY
Linux 2.6.26 (x86).
.SH SEE ALSO
.BR prctl (2),
.BR PR_SET_TSC (2const)