chmod() converts local domain socket file to regular file

[Andrey Simonenko <simon at comsys dot ntu-kpi dot kiev dot ua>]

Greetings,

Has Cygwin 1.5.24-2 and XP.

A program creates local domain socket.  If S_IRUSR bit is
removed from the socket file, then this file is converted to a
regular file.

This program shows this problem (check the output of "ls -l sock"):

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>

#include <string.h>
#include <unistd.h>

int
main(void)
{
	struct sockaddr_un addr;
	int sd;

	sd = socket(PF_LOCAL, SOCK_DGRAM, 0);
	if (sd < 0)
		return 1;
	memset(&addr, 0, sizeof(addr));
	addr.sun_family = PF_LOCAL;
	strncpy(addr.sun_path, "./sock", sizeof(addr.sun_path) - 1);
	if (bind(sd, (struct sockaddr *)&addr, SUN_LEN(&addr)) < 0)
		return 1;
	if (chmod(addr.sun_path, S_IWUSR) < 0)
		return 1;
	if (listen(sd, 4) < 0)
		return 1;
	if (close(sd) < 0)
		return 1;
	return 0;
}

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