On Wed, Aug 05, 2015 at 11:05:56AM +0100, Laszlo Papp wrote:
> Hi,
>
> The code below reproduces the issue. The code is intentionally kept
> small, so it deliberately does not have error checking, et al.
>
> Now, my concern is that it blocks for the write operation if the cable
> is disconnected. This is not inline with the /dev/ttyS* operation, for
> instance. They would not block if I disconnected the serial cable.
>
> Is this a bug or feature? :-) If it turns out to be a feature, is it
> better to use O_NONBLOCK if one does not want to use pthreads, etc?
>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
>
> int main()
> {
> const char buf[] = "Hello World!\n";
> int fd = open("/dev/ttyGS0", O_RDWR | O_NONBLOCK);
This line discipline is very different from the "traditional" tty line
discipline, so it might not know anything about cable removals.
good luck,
greg k-h
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