From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3805BF27.1944652E@fadata.bg> Date: Thu, 14 Oct 1999 14:31:51 +0300 From: Momchil Velikov MIME-Version: 1.0 To: Michael Schmitz CC: Mario Scarpa , linuxppc-dev@lists.linuxppc.org Subject: Re: serial on lombard References: <199910141119.NAA09122@opal.biophys.uni-duesseldorf.de> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Michael Schmitz wrote: > > > alarm(0x2, 0x7ffff7b4, 0, 0x8, 0x7f7f7f7f) = 0 > > open("/dev/ttyS0", O_RDWR|O_NONBLOCK) = 3 > > --- SIGALRM (Alarm clock) --- > > alarm(0, 0x1, 0, 0x8, 0x7f7f7f7f) = 0 > > rt_sigaction(0xe, 0x7ffff698, 0x7ffff728, 0x8) = 0 > > write(2, "minicom: cannot open /dev/ttyS0:"..., 59minicom: cannot open /dev/ttyS0: No such file or directory > > ) = 59 > > The port blocks on open, and you get a timeout. But there is O_NONBLOCK, and according to POSIX, " ... if O_NONBLOCK flags is set or if CLOCAL has been set, the open() function shall return immediately without waiting for the connection." Note that this is the/a way to set CLOCAL -- open the device with O_NONBLOCK and then tcsetattr() or whatever. > > The serial port won't open without carrier detected. minicom fails to set > the port characteristics properly (or the Mac serial driver doesn't honor > minicom's port settings), and gives a very confusing error message (open > /dev/ttyS0 timed out would have been more accurate). > > Set ttyS0 to ignore DCD with stty clocal