TIOCGLCKTRMIOS - locking the termios structre

NAME  LIBRARY  SYNOPSIS  DESCRIPTION  RETURN VALUE  ERRORS  CAVEATS  SEE ALSO 

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NAME

TIOCGLCKTRMIOS, TIOCSLCKTRMIOS − locking the termios structre

LIBRARY

Standard C library (libc, −lc)

SYNOPSIS

#include <asm/termbits.h> /* Definition of TIOC*CLKTRMIOS constants */
#include <sys/ioctl.h>

int ioctl(int fd, TIOCGLCKTRMIOS, struct termios *argp);
int ioctl(int fd, TIOCSLCKTRMIOS, const struct termios *argp);

#include <asm/termbits.h>

struct termios;

DESCRIPTION

The termios structure of a terminal can be locked. The lock is itself a termios structure, with nonzero bits or fields indicating a locked value.
TIOCGLCKTRMIOS

Gets the locking status of the termios structure of the terminal.

TIOCSLCKTRMIOS

Sets the locking status of the termios structure of the terminal. Only a process with the CAP_SYS_ADMIN capability can do this.

RETURN VALUE

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

ERRORS

EPERM

Insufficient permission.

CAVEATS

Please note that struct termios from <asm/termbits.h> is different and incompatible with struct termios from <termios.h>. These ioctl calls require struct termios from <asm/termbits.h>.

SEE ALSO

ioctl(2), ioctl_tty(2), TCSETS(2const)

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