Problem with bind

Here's my function

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <signal.h>

#define SERVER_PATH "/tmp/srv"
#define BUFFER_LENGTH 250

static int open_sock(void) {

int sd=-1;
int r=-1;
struct sockaddr_un serv_addr;

if(sd = socket(AF_UNIX, SOCK_STREAM, 0) < 0) {

perror("socket() failed");
return sd;
}

memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sun_family = AF_UNIX;
strcpy(serv_addr.sun_path, SERVER_PATH);

if(bind(sd, (struct sockaddr*)&serv_addr, sizeof(&serv_addr)) < 0) {
perror("bind() failed");
return -1;
}

chmod (serv_addr.sun_path,0777);

listen(sd, 20);
return sd;
}

Basically, I am trying to open a Unix Socket for listening request. However, when I execute the file, the bind() always return an error with
"bind() failed: Socket operation on non-socket"

Can anyone tell me what might cause this issue in bind? Thanks
The socket 'sd' value before bind is 0, which I find kind of strange.
Also, the path '/tmp/srv' is non-existence before socket creation. Should I make this path first?

What happens if you use AF_INET to opend the socket rather than AF_UNIX?

Unfortunately, the AF_INET fails as well. I am thinking could it be the fact that there is something in the Linux setting itself that disallow the creation of socket. I'll keep searching. Thanks

I think you have a problem with the socket creation and the error checking:
[code]
if( (sd = socket(AF_UNIX, SOCK_STREAM, 0) ) < 0) {
[code]

What you are doing is checking if socket() < 0 and then assigning the value of this comparison to sd. The additional parenthesis in the above code should do the trick.

HTH,
Richard

Yes, it does. Thanks bro..
How careless of me.