深入理解TCP/IP协议的实现之connect（基于linux1.2.13）

/*
    socket 通过socket函数申请的结构体
    address 需要连接的目的地地址信息
*/
int connect(int socket, const struct sockaddr *address,socklen_t address_len);

static int sock_connect(int fd, struct sockaddr *uservaddr, int addrlen)
{
    struct socket *sock;
    struct file *file;
    int i;
    char address[MAX_SOCK_ADDR];
    int err;

    if (fd < 0 || fd >= NR_OPEN || (file=current->files->fd[fd]) == NULL)
        return(-EBADF);
    if (!(sock = sockfd_lookup(fd, &file)))
        return(-ENOTSOCK);

    i = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, file->f_flags);
    if (i < 0) 
    {
        return(i);
    }
    return(0);
}