.\" Copyright, The contributors to the Linux man-pages project
.\"
.\" SPDX-License-Identifier: GPL-1.0-or-later
.\"
.TH TIOCEXCL 2const 2025-05-06 "Linux man-pages 6.14"
.SH NAME
TIOCEXCL,
TIOCGEXCL,
TIOCNXCL
\-
exclusive mode
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <asm/termbits.h>" "  /* Definition of " TIOC*XCL " constants */"
.B #include <sys/ioctl.h>
.P
.BI "int ioctl(int " fd ", TIOCEXCL);"
.BI "int ioctl(int " fd ", TIOCGEXCL, int *" argp );
.BI "int ioctl(int " fd ", TIOCNXCL);"
.fi
.SH DESCRIPTION
.TP
.B TIOCEXCL
Put the terminal into exclusive mode.
No further
.BR open (2)
operations on the terminal are permitted.
(They fail with
.BR EBUSY ,
except for a process with the
.B CAP_SYS_ADMIN
capability.)
.TP
.B TIOCGEXCL
If the terminal is currently in exclusive mode,
place a nonzero value in the location pointed to by
.IR argp ;
otherwise, place zero in
.IR *argp .
.TP
.B TIOCNXCL
Disable exclusive mode.
.SH RETURN VALUE
On success,
0 is returned.
On error,
\-1 is returned, and
.I errno
is set to indicate the error.
.SH HISTORY
.TP
.B TIOCGEXCL
Linux 3.8.
.SH SEE ALSO
.BR ioctl (2),
.BR ioctl_tty (2)