TIOCCONS(2const) — Linux manual page

TIOCCONS(2const)                                        TIOCCONS(2const)

NAME

       TIOCCONS - redirecting console output

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       int ioctl(int fd, TIOCCONS);

DESCRIPTION

       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

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

ERRORS

       EBUSY  Output was redirected already.

       EPERM  Insufficient permission.

HISTORY

       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

       ioctl(2), ioctl_tty(2)

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Linux man-pages 6.9.1          2024-06-13               TIOCCONS(2const)

Pages that refer to this page: ioctl_tty(2)

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