----- Original Message -----
> From: Achim Gratz
> To: cygwin
> Cc:
> Date: 2019/3/6, Wed 04:24
> Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
>
>T atsuro MATSUOKA writes:
>> I contacted with Enrico who tells me the patch that I have shown.
>
> Yes, but that monkeys around the real problem. What Yaakov is telling
> you is that there are two options and we don't know yet which one we
> have to deal with.
>
> If O_NONBLOCK is needed, but does not work correctly under Cygwin, then
> that's a bug in Cygwin. For this case, Corinna asks you to create an
> STC that demonstrates the bug so it can be triaged without having to
> work with something as complex as the Qt terminal in Cygwin.
>
> If on the other hand O_NONBLOCK is in fact not needed and just shows
> different behaviour on different systems without a bug in the
> implementation being present, then upstream should remove that argument.
>
>
> Regards,
> Achim.
Seeing ML archive that Enrico indicated,
Re: select() and named pipes
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define FIFONAME "/tmp/pipe"
int main(void)
{
int fd;
int nsel;
fd_set readfds;
FD_ZERO(&readfds);
if (mkfifo(FIFONAME, 0600) < 0) {
perror("mkfifo");
exit(1);
}
fd = open(FIFONAME, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
perror("open");
remove(FIFONAME);
exit(2);
}
FD_SET(fd, &readfds);
do {
nsel = select(fd + 1, &readfds, 0, 0, 0);
} while (nsel == -1 && (errno == EINTR || errno == EAGAIN));
if (nsel == -1) {
perror("select");
exit(3);
}
if (FD_ISSET(fd, &readfds)) {
char buf[100];
int status;
int count = 0;
printf("%d: ", ++count);
while ((status = read(fd, buf, sizeof(buf) - 1))) {
if (status > 0) {
buf[status] = '\0';
printf("%s", buf);
} else if (errno == EAGAIN) {
printf("\n%d: ", ++count);
} else {
perror("read");
break;
}
}
}
close(fd);
remove(FIFONAME);
return 0;
}
As you wrote this is a issue of Cygwin issue.
But As long as O_NONBLOCK does not work on Cygwin, Enrico's workaround can be
attached for qt.
Tatsuro
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
