Add error info for bind error

[LeiZhang-Hunter]

当超过108个字节会出现失败提示，但是实际上执行会出现成功的情况

#include <sys/un.h>
#include <sys/socket.h>
#include <unistd.h>

int main() {
    char *dir = "/home/zhanglei/data/www/pureliving/framework/Service/Factory/Process/Actor/Sock/ProcessServiceCenter28291.sock";

    int sockfd;
    socklen_t len;
    struct sockaddr_un addr1, addr2;
    unlink(dir);  //delete file
    sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
    bzero(&addr1, sizeof(addr1));
    addr1.sun_family = AF_LOCAL;
    strncpy(addr1.sun_path, dir, sizeof(addr1.sun_path) - 1);
    int res = bind(sockfd, (struct sockaddr *) &addr1, SUN_LEN(&addr1));
}

执行结果 绑定成功
"/home/zhanglei/data/www/pureliving/framework/Service/Factory/Process/Actor/Sock/ProcessServiceCenter28291.s"