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)