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)

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