On Wed, Sep 21, 2011 at 02:43:21PM -0600, Eric Blake wrote:
>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
http://msdn.microsoft.com/en-us/library/aa364439%28VS.85%29.aspx
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