plucky (2) TIOCGSOFTCAR.2const.gz

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)