TIOCCONS(2const) - Linux manual page (original) (raw)

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](../man3/errno.3.html)_ 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)](../man2/ioctl.2.html), [ioctl_tty(2)](../man2/ioctl%5Ftty.2.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 TIOCCONS(2const)

Pages that refer to this page:ioctl_tty(2)