socket那点小事。

int accept(int socket, struct sockaddr *address, socklen_t *address_len);

int bind(int socket, const struct sockaddr *address, socklen_t address_len);

int connect(int socket, const struct sockaddr *address, socklen_t address_len);

int getpeername(int socket, struct sockaddr *address, socklen_t *address_len);

int getsockname(int socket, struct sockaddr *address, socklen_t *address_len);

int getsockopt(int socket, int level, int option_name, void *option_value, socklen_t *option_len);

int listen(int socket, int backlog);

ssize_t recv(int socket, void *buffer, size_t length, int flags);

ssize_t recvfrom(int socket, void *buffer, size_t length, int flags, struct sockaddr *address, socklen_t *address_len);

ssize_t recvmsg(int socket, struct msghdr *message, int flags);

ssize_t send(int socket, const void *message, size_t length, int flags);

ssize_t sendmsg(int socket, const struct msghdr *message, int flags);

ssize_t sendto(int socket, const void *message, size_t length, int flags, const struct sockaddr *dest_addr, socklen_t dest_len);

int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len);int shutdown(int socket, int how);

int socket(int domain, int type, int protocol);

int socketpair(int domain, int type, int protocol, int socket_vector[2]);

在那个《深入理解计算机系统》11章有专门说的这个网络编程

client 流程：

socket

connect

 send

 receive

 send EOF

close

server流程：

socket

bind

listen

 accept

 receive

 send

 receive

close

=============================================================

其他比较细的地方有

struct sockaddr (socket.h)

sa_family_t   sa_family       address family 
char          sa_data[]       socket address (variable-length data)

struct sockaddr_in (netinet/in.h)

　　short int sin_family; /* Address family */
　　unsigned short int sin_port; /* Port number */
　　struct in_addr sin_addr; /* Internet address */
　　unsigned char sin_zero[8]; /* Same size as struct sockaddr */

--

in_addr_t    inet_addr(const char *); 
char        *inet_ntoa(struct in_addr); 
const char  *inet_ntop(int, const void *restrict, char *restrict,                  socklen_t); 
int          inet_pton(int, const char *restrict, void *restrict);
===
#include <netinet/in.h>
The <netinet/in.h> header shall define the sockaddr_in structure that includes at least the following members:
sa_family_t     sin_family   AF_INET.  
in_port_t       sin_port     Port number.  
struct in_addr  sin_addr     IP address. 
=================
附上两篇非常棒的文章：
http://www.ibm.com/developerworks/cn/education/linux/l-sock/section4.html#ibm-pcon
http://www.ibm.com/developerworks/cn/education/linux/l-sock2/index.html