本文共 4022 字,大约阅读时间需要 13 分钟。
sockaddr_in
,位于netinet/in.h
头文件中,定义如下。 struct in_addr{ in_addr_t s_addr;};struct sockaddr_in{ uint8_t sin_len; sa_family_t sin_family; in_port_t sin_port; struct in_addr sin_addr; char sin_zero(0);};
in_addr_t
in_port_t
位于netinet/in.h
in_addr_t
一般定义为uint32_t
,in_port_t
一般定义为uint16_t
sa_family_t
位于sys/socket.h
uint8_t
等位于sys/types.h
中sin_addr
sin_port
即为以网络字节序存储的32位ip地址与端口号sockaddr
,一般进行强制类型转换即可。sys/socket.h
中 int socket(int family, int type, int protocal);
AF_INET``AF_INET6
,分别表示IPv4/6协议。SOCK_STREAM
SOCK_DGRAM
SOCK_RAW
,分别表示字节流(TCP),数据报(UDP),原始套接字。IPPROTO_TCP'
IPPROTO_UDP`通常设置为0也可。int connect(int sockfd, const struct sockaddr *servaddr, int addrlen);
int bind(int sockfd, const struct sockadddr *myaddr, int addrlen);
int listen(int sockfd, int backlog);
int accept(int sockfd, struct sockaddr *cliaddr, int *addrlen)
int close(int sockfd);
int recv(int sockfd, void *buf, size_t len, int flags);int send(int sockfd, const void *buf, size_t len, int flags);
#include#include #include #include int main(){ struct sockaddr_in local; int s; int sl; int rc; char buf[1000]; local.sin_family = AF_INET; local.sin_port = htons(7500); local.sin_addr.s_addr = htonl(INADDR_ANY); s = socket(AF_INET, SOCK_STREAM, 0); if ( s < 0){ perror("socket call failed"); exit(1); } rc = bind(s, (struct sockaddr *) &local, sizeof(local)); if ( rc < 0){ perror("bind call failed"); exit(1); } rc = listen(s, 5); if ( rc < 0){ perror("listen call failed"); exit(1); } sl = accept(s, NULL, NULL); if ( sl < 0){ perror("accept call failed"); exit(1); } rc = recv(sl, buf, 10, 0); if ( rc < 0){ perror("recv call failed"); exit(1); } printf("%s\n", buf); rc = send(sl, "good", 10, 0); if ( rc < 0){ perror("send call failed"); exit(1); } exit(0);}
#include#include #include #include #include int main(){ struct sockaddr_in peer; int s; int rc; char buf[100]; peer.sin_family = AF_INET; peer.sin_port = htons(7500); peer.sin_addr.s_addr = inet_addr("127.0.0.1"); s = socket(AF_INET, SOCK_STREAM, 0); if ( s < 0 ){ perror("socket call failed"); exit(1); } rc = connect(s, (struct sockaddr *) &peer, sizeof(peer)); if (rc){ perror("connect call failed"); exit(1); } rc = send(s, "hello", 10, 0); if (rc <= 0) { perror("send call failed"); exit(1); } rc = recv(s, buf, 10, 0); if (rc <= 0){ perror("recv call failed"); } else printf("%s\n", buf); exit(0);}
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