Alan Cox wrote:
> > >It doesnt however seem to guarantee they wont get hung up on instantly
> > >before they can issue a tcsetattr() ?
> > IIRC, the hangup is only generated on a DCD *drop*, not on DCD being
> > already low.
>
> Thats fine. If you are using a serial port which has a remote adapter that
> is running on a high speed RS485 network where DCD is raised and lowered
> as packets go past
Huh? Strange device...
> perhaps you'd care to tell me how to handle it without
> /dev/cua devices - and portably.
struct termios termios;
int fd;
fd = open( "/dev/ttyS0", O_RDWR | O_NDELAY );
tcgetattr( fd, &termios );
termio.c_cflag |= CLOCAL;
tcsetattr( fd, TCSANOW, &termios);
fcntl( fd, F_SETFL, O_RDWR );
/* work with non-blocking, non-carrier-sensitive file descriptor */
Alternatively, you could play with TIOCSSOFTCAR ("soft carrier"), though I
don't know off my head whether that's a SunOS invention or also present in
Linux.
gert
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Gert Doering - Munich, Germany gert@greenie.muc.de
fax: +49-89-35655025 gert.doering@physik.tu-muenchen.de
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