man7.org > Linux > man-pages

Linux/UNIX system programming training

PR_SET_TSC(2const) — Linux manual page

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON 

PR_SET_TSC(2const)                                     PR_SET_TSC(2const)

NAME         top

       PR_SET_TSC - change whether the timestamp counter can be read by
       the process

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <linux/prctl.h>  /* Definition of PR_* constants */
       #include <sys/prctl.h>

       int prctl(PR_SET_TSC, long flag);

DESCRIPTION         top

       Set the state of the flag determining whether the timestamp
       counter can be read by the process.  Pass PR_TSC_ENABLE to flag to
       allow it to be read, or PR_TSC_SIGSEGV to generate a SIGSEGV when
       the process tries to read the timestamp counter.

RETURN VALUE         top

       On success, 0 is returned.  On error, -1 is returned, and errno is
       set to indicate the error.

ERRORS         top

       EINVAL arg2 is not a valid value.

STANDARDS         top

       Linux.  x86 only.

HISTORY         top

       Linux 2.6.26 (x86).

SEE ALSO         top

       prctl(2), PR_GET_TSC(2const)

COLOPHON         top

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.15.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2025-08-11.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.15            2025-05-17             PR_SET_TSC(2const)

Pages that refer to this page: prctl(2),  PR_GET_TSC(2const)

HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface.

For details of in-depth Linux/UNIX system programming training courses that I teach, look here.

Hosting by jambit GmbH.

Cover of TLPI