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On Aug 18 22:39, Ross Ridge wrote: > Corinna Vinschen writes: > > On Linux isatty on a descriptor connected to serial line returns 0, > > on Cygwin it returned 1 so far. I fixed both problems here, isatty > > on a serial line returns 0 now, and lseek on serial (and, FWIW, > > sockets) don't simply return 0 anymore, but rather -1 with errno set > > to ESPIPE, as on Linux. > > I'm not sure if Chet Ramey's suggestion that if isatty() returns 1 > then bash is allowed to assume reads are newline-delimited is correct. > On Unix this would only be true if cannonical mode input processing was > enabled (icanon), and Cygwin stty reports that this mode is disabled > (-icanon) on serial devices. Or at least it used to, with the snapshot > DLL it now complains "/dev/ttyS0: Inappropriate ioctl for device". > > For what its worth my tests on Linux shows that isatty() returns 1 on > a serial device, namely /dev/ttyS0. Which is what I would expect given > that serial devices have traditionally been synonymous with ttys on Unix. I reverted this part of the patch. My test was flawed. The problem is that on Linux, /dev/ttyS[0-3] exists even if they are not backed by hardware. In this case, as is on my local machine, isatty returns 0. However, if there's a device connected to /dev/ttySx, isatty returns 1. So I just applied a patch which reverts the isatty status to /dev/ttySx and thus, stty works as before. > > Ross, please give it a try. > > The snapshot DLL solves the bug and the script runs without any data > being lost. Thanks for looking into this. Thanks for testing and discussing this problem. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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