Linux环境下socket常用API介绍

爱被打了一巴掌 2022-07-15 07:10 115阅读 0赞

常用API

int socket (int \_\_domain, int \_\_type, int \_\_protocol);

TCP:

int connect (int \_\_fd, \_\_CONST\_SOCKADDR\_ARG \_\_addr, socklen\_t \_\_len);

int listen (int \_\_fd, int \_\_n) ;

int accept (int \_\_fd, \_\_SOCKADDR\_ARG \_\_addr, socklen\_t \*\_\_restrict \_\_addr\_len);

UDP与TCP都常用

int bind (int \_\_fd, \_\_CONST\_SOCKADDR\_ARG \_\_addr, socklen\_t \_\_len);

**收发数据：**

ssize\_t send (int \_\_fd, \_\_const void \*\_\_buf, size\_t \_\_n, int \_\_flags);

ssize\_t recv (int \_\_fd, void \*\_\_buf, size\_t \_\_n, int \_\_flags);

[http://www.cnblogs.com/blankqdb/archive/2012/08/30/2663859.html][http_www.cnblogs.com_blankqdb_archive_2012_08_30_2663859.html]

![Image 1][]

带ip+端口的发送

ssize\_t sendto (int \_\_fd, \_\_const void \*\_\_buf, size\_t \_\_n,

int \_\_flags, \_\_CONST\_SOCKADDR\_ARG \_\_addr,

socklen\_t \_\_addr\_len);

ssize\_t recvfrom (int \_\_fd, void \*\_\_restrict \_\_buf, size\_t \_\_n,

int \_\_flags, \_\_SOCKADDR\_ARG \_\_addr,

socklen\_t \*\_\_restrict \_\_addr\_len);

这个flag与上面给出去的flag更加详细：

ssize\_t sendmsg (int \_\_fd, \_\_const struct msghdr \*\_\_message,

int \_\_flags);

ssize\_t recvmsg (int \_\_fd, struct msghdr \*\_\_message, int \_\_flags);

[http://blog.chinaunix.net/uid-29362923-id-4020974.html][http_blog.chinaunix.net_uid-29362923-id-4020974.html]

**使用难度：**

**write《send 《sento《sendmsg。其实一般情况下send足够使用了；**

设置与获取socketopt

int getsockopt (int \_\_fd, int \_\_level, int \_\_optname,

void \*\_\_restrict \_\_optval,

socklen\_t \*\_\_restrict \_\_optlen);

int setsockopt (int \_\_fd, int \_\_level, int \_\_optname,

\_\_const void \*\_\_optval, socklen\_t \_\_optlen);

int shutdown (int \_\_fd, int \_\_how) ;

shutdown 支持不同的方向的关闭。而且是非线程安全的;

[http://blog.csdn.net/u011542994/article/details/44892201][http_blog.csdn.net_u011542994_article_details_44892201]

[http_www.cnblogs.com_blankqdb_archive_2012_08_30_2663859.html]: http://www.cnblogs.com/blankqdb/archive/2012/08/30/2663859.html
[Image 1]: 
[http_blog.chinaunix.net_uid-29362923-id-4020974.html]: http://blog.chinaunix.net/uid-29362923-id-4020974.html
[http_blog.csdn.net_u011542994_article_details_44892201]: http://blog.csdn.net/u011542994/article/details/44892201