fsync() is required to work on read-only fds (in theory, you can sync
the atime metadata, which is a write operation triggered by a read-only
fd). But cygwin rejects this program, which works on Linux:
$ cat foo.c
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <fcntl.h>
int main (void)
{
int fd = open("file", O_CREAT|O_EXCL|O_WRONLY, 0600);
if (fd < 0)
return 1;
if (close(fd))
return 2;
fd = open("file", O_RDONLY);
if (fd < 0)
return 3;
if (fsync(fd))
return 4;
if (unlink("file"))
return 5;
puts("success");
return 0;
}
$ rm -f file && ./foo; echo $?
4
--
Eric Blake ebl...@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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