there must be a reason why minicom uses O_NDELAY (=O_NONBLOCK) in case
O_NDELAY ist defined. Now i remember that i had the same problem several
years ago with cat file >/dev/ttyUSB0, i think it was Fedora Core 3 or 4.
I assume this does not only happen with a pl2303.
#if defined(O_NDELAY) && defined(F_SETFL)
portfd = open(dial_tty, O_RDWR|O_NDELAY|O_NOCTTY);
if (portfd >= 0) {
/* Cancel the O_NDELAY flag. */
n = fcntl(portfd, F_GETFL, 0);
fcntl(portfd, F_SETFL, n & ~O_NDELAY);
}
#else
if (portfd < 0)
portfd = open(dial_tty, O_RDWR|O_NOCTTY);
#endif
On 08/18/2011 06:49 PM, Mark Morgan Lloyd wrote:
Ludo Brands wrote:
Some serial ports seem to have clocal unset, for some reason, which
causes it to block on open (waiting for the modem status
lines). Like
you, I've never seen it with any of my serial ports, either.
Might have to do with the defaulting to autobaud of some usbserial
chips. _______________________________________________
Apparently a bug in a recent usb serial kernel module pl2303:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/661321
Well spotted :-) I was going to speculate that it might be something
to do with the Prolific driver- I think that the device I use most is
FTDI.
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