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NAME
TIOCCONS - redirecting console output
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
bash
#include <asm/termbits.h>\n /* Definition of \nTIOCCONS\n */
\n#include <sys/ioctl.h>bash
int ioctl(int \nfd\n, 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)