According to
http://www.opengroup.org/onlinepubs/000095399/functions/open.html
the open() function shall fail and sets errno to ENXIO if
O_WRONLY | O_NONBLOCK is set, the named file is a FIFO, and no
process has the file open for reading.
This is not the case on Cygwin, as demonstrated by the attached
test case. I get "This should not happen.", while the same program
outputs "No process is reading from the other end." on both Linux
and Solaris.
--
Enrico
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define FIFONAME "/tmp/xyz.xyz"
int main(void)
{
int fd;
if (mkfifo(FIFONAME, 0600) < 0) {
perror("Error");
exit(1);
}
fd = open(FIFONAME, O_WRONLY | O_NONBLOCK);
if (fd >= 0) {
puts("This should not happen.");
close(fd);
} else if (errno == ENXIO) {
puts("No process is reading from the other end.");
}
remove(FIFONAME);
return 0;
}
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