chmod() on AF_UNIX sockets broken

[Jason Tishler]

While tracking down a PostgreSQL problem, I uncovered that chmod()
appears to have no affect on AF_UNIX sockets on recent Cygwin versions.

The attached test case, afunix.cc, demonstrates the problem:

    $ # Cygwin 1.3.22-1
    $ afunix
    $ ls -l /tmp/.afunix 
    srwx------    1 jt       Domain U        0 Mar 19 15:57 /tmp/.afunix

    $ # Red Hat Linux 8.0
    $ afunix
    $ ls -l /tmp/.afunix 
    srwxrwxrwx    1 jt       dev             0 Mar 19 17:13 /tmp/.afunix

    $ # Cygwin 1.3.18-1
    $ afunix
    $ ls -l /tmp/.afunix 
    srwxrwxrwx    1 jt       Domain U        0 Mar 19 17:13 /tmp/.afunix

Jason

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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/errno.h>
#include <sys/stat.h>

int
main()
{
        
        const char file[] = "/tmp/.afunix";

        umask(0077);

        int status = unlink(file);
        if (status < 0 && errno != ENOENT)
        {
                printf("unlink() failed with %d\n", errno);
                return 1;
        }

        int fd = socket(AF_UNIX, SOCK_STREAM, 0);
        if (fd < 0)
        {
                printf("socket() failed with %d\n", errno);
                return 1;
        }

        struct sockaddr_un address;
        memset(&address, 0, sizeof(address));
        address.sun_family = AF_UNIX;
        strcpy(address.sun_path, file);
        int len = sizeof(address);
        status = bind(fd, (sockaddr*) &address, len);
        if (status < 0)
        {
                printf("bind() failed with %d\n", errno);
                return 1;
        }

        status = chmod(file, 0777);
        if (status < 0)
        {
                printf("chmod() failed with %d\n", errno);
                return 1;
        }

        return 0;
}


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