Ubuntu上的套接字(不允许操作)

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

#define SOCK_PATH "echo_socket"

int main(void)
{
    int s,s2,t,len;
    struct sockaddr_un local,remote;
    char str[100];

    if ((s = socket(AF_UNIX,SOCK_STREAM,0)) == -1) {
        perror("socket");
        exit(1);
    }

    local.sun_family = AF_UNIX;
    strcpy(local.sun_path,SOCK_PATH);
    unlink(local.sun_path);
    len = strlen(local.sun_path) + sizeof(local.sun_family);
    if (bind(s,(struct sockaddr *)&local,len) == -1) {
        perror("bind");
        exit(1);
    }
return 0;
}

我已经想出要编译它(Code :: Blocks)必须还有一个包含：

#include <unistd.h>

但成功运行后,我收到消息“Bind：Operation not permitted”.哪里不对？我试图在root下运行它仍然无法正常工作.