NAME

       TIOCGSOFTCAR, TIOCSSOFTCAR - marking a line as local

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       int ioctl(int fd, TIOCGSOFTCAR, int *argp);
       int ioctl(int fd, TIOCSSOFTCAR, const int *argp);

DESCRIPTION

       TIOCGSOFTCAR
              ("Get  software  carrier  flag")  Get  the status of the CLOCAL flag in the c_cflag
              field of the termios structure.

       TIOCSSOFTCAR
              ("Set software carrier flag") Set the CLOCAL flag in  the  termios  structure  when
              *argp is nonzero, and clear it otherwise.

       If  the  CLOCAL  flag  for  a  line  is  off,  the hardware carrier detect (DCD) signal is
       significant, and an open(2)  of  the  corresponding  terminal  will  block  until  DCD  is
       asserted,  unless  the O_NONBLOCK flag is given.  If CLOCAL is set, the line behaves as if
       DCD is always asserted.  The software carrier flag is usually turned on for local devices,
       and is off for lines with modems.

RETURN VALUE

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

SEE ALSO

       ioctl(2), ioctl_tty(2)