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Date: Thu, 13 Aug 2009 22:05:37 -0400
From: cygwin <karl AT sipxx DOT com>
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Subject: Re: Cygwin1.dll 1.7.0-5x: RSYNC failures in close() system call on  	pipe  file descriptors
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I forgot to add that the same binary copy of the executable of the test 
program (compiled under 1.7) works without error if I place the 
cygwin1.dll version 1.5 into the same directory.


cygwin wrote:
>
> I wrote a small test program to isolate the problem from RSYNC.
> The problem occurs when a file descriptor obtained from socketpair()  
> is dup2()'ed into STDIN and then closed. The close call fails.
> Output from the program is as follows:
>
> socket 1 = 3
> socket 2 = 4
> dup2 socket 1...
> closing socket 1...
> close: Socket operation on non-socket
> closing socket 1 failed
>
>
> It is interesting to note that the close() is successful when the dup2 
> calling sequence is omitted.
> Since socketpair() in cygwin appears to use AF_INET sockets to 
> simulate AF_UNIX it might be interesting to try this on a single INET 
> socket.
>
>
>
> ===============================================
> #include <stdio.h>
> #include <stdlib.h>
> #include <unistd.h>
> #include <sys/socket.h>
>
> main()
> {
>        int fd[2];
>        int res = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
>        if (res < 0) {
>                perror("socketpair");
>                fprintf(stderr, "socketpair failed\n");
>                exit(1);
>        }
>
>        fprintf(stderr, "socket 1 = %d\n", fd[0]);
>        fprintf(stderr, "socket 2 = %d\n", fd[1]);
>
>        fprintf(stderr, "dup2 socket 1...\n");
>        res = dup2(fd[0], STDIN_FILENO);
>        if (res < 0) {
>                perror("dup2");
>                fprintf(stderr, "dup2 failed\n");
>        }
>
>        fprintf(stderr, "closing socket 1...\n");
>        res = close(fd[0] < 0);
>        if (res < 0) {
>                perror("close");
>                fprintf(stderr, "closing socket 1 failed\n");
>        }
> }
> =====================================================
>


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