This is the mail archive of the cygwin mailing list for the Cygwin project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Cygwin1.dll 1.7.0-5x: RSYNC failures in close() system call on pipe file descriptors

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>

       int fd[2];
       int res = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
       if (res < 0) {
               fprintf(stderr, "socketpair failed\n");

       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) {
               fprintf(stderr, "dup2 failed\n");

       fprintf(stderr, "closing socket 1...\n");
       res = close(fd[0] < 0);
       if (res < 0) {
               fprintf(stderr, "closing socket 1 failed\n");

Problem reports:
Unsubscribe info:

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]