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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 ofTIOCCONS*/#include <sys/ioctl.h>int ioctl(intfd, 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 theCAP_SYS_ADMINcapability may do this.       If output was redirected already, thenEBUSYis returned, but       redirection can be stopped by using this ioctl withfd pointing at/dev/console or/dev/tty0.

RETURN VALUE        top

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

ERRORS        top

EBUSYOutput was redirected already.EPERMInsufficient permission.

HISTORY        top

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

SEE ALSO        top

ioctl(2),ioctl_tty(2)

COLOPHON        top

       This page is part of theman-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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17TIOCCONS(2const)

Pages that refer to this page:ioctl_tty(2)

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