TIOCCONS(2const) — Linux manual page

TIOCCONS(2const)                                        TIOCCONS(2const)

NAME         top

       TIOCCONS - redirecting console output

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <asm/termbits.h>  /* Definition of TIOCCONS */
       #include <sys/ioctl.h>

       int ioctl(int fd, TIOCCONS);

DESCRIPTION         top

       Redirect output that would have gone to /dev/console or /dev/tty0
       to the given terminal.  If that was a pseudoterminal master, send
       it to the slave.

       Only a process with the CAP_SYS_ADMIN capability may do this.

       If output was redirected already, then EBUSY is returned, but
       redirection can be stopped by using this ioctl with fd pointing
       at /dev/console or /dev/tty0.

RETURN VALUE         top

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

ERRORS         top

       EBUSY  Output was redirected already.

       EPERM  Insufficient permission.

HISTORY         top

       Before Linux 2.6.10, anybody can do this as long as the output
       was not redirected yet; CAP_SYS_ADMIN was not necessary.

SEE ALSO         top

       ioctl(2), ioctl_tty(2)

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-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  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 6.9.1          2024-06-13               TIOCCONS(2const)

Pages that refer to this page: ioctl_tty(2)

HTML rendering created 2024-06-26 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.