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UNIX-Linux socket网络编程（下）：UDP和TCP通信的简单范例_tcp 通信程序perror
作者：我家自动化 | 2024-02-28 12:19:33
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tcp 通信程序perror
一、UDP通信
本地通信：
a.c
#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/un.h> typedef struct sockaddr* SP; int main() { // 创建socket int sockfd = socket(AF_LOCAL,SOCK_DGRAM,0); if(0 > sockfd) { perror("socket"); return -1; } // 准备地址 struct sockaddr_un addr,src_addr; addr.sun_family = AF_LOCAL; strcpy(addr.sun_path,"socketA"); // 绑定会自动创建socket文件 remove(addr.sun_path); if(bind(sockfd,(SP)&addr,sizeof(addr))) { perror("bind"); return -1; } for(;;) { char buf[256] = {}; socklen_t len; // 接收 recvfrom(sockfd,buf,sizeof(buf),0,(SP)&src_addr,&len); printf("recv:%s from:%s\n",buf,src_addr.sun_path); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } // 发送 strcat(buf,"!"); sendto(sockfd,buf,strlen(buf)+1,0,(SP)&src_addr,len); } // 关闭 close(sockfd); // 删除 remove(addr.sun_path); }
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b.c。
#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/un.h> typedef struct sockaddr* SP; int main() { // 创建socket对象 int sockfd = socket(AF_LOCAL,SOCK_DGRAM,0); if(0 > sockfd) { perror("socket"); return -1; } // 准备绑定地址 struct sockaddr_un addr,dest_addr; addr.sun_family = AF_LOCAL; strcpy(addr.sun_path,"socketB"); dest_addr.sun_family = AF_LOCAL; strcpy(dest_addr.sun_path,"socketA"); // 绑定 remove(addr.sun_path); if(bind(sockfd,(SP)&addr,sizeof(addr))) { perror("bind"); return -1; } for(;;) { char buf[256] = {}; printf(">"); gets(buf); // 发送 sendto(sockfd,buf,strlen(buf)+1,0,(SP)&dest_addr,sizeof(dest_addr)); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } socklen_t len; // 接收 recvfrom(sockfd,buf,sizeof(buf),0,(SP)&addr,&len); printf("recv:%s\n",buf); } // 关闭 close(sockfd); // 删除 remove(addr.sun_path); }
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网络通信：
server.c。
#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> typedef struct sockaddr* SP; int main() { int sockfd = socket(AF_INET,SOCK_DGRAM,0); if(0 > sockfd) { perror("socket"); return -1; } struct sockaddr_in addr,src_addr; addr.sin_family = AF_INET; addr.sin_port = htons(端口号); addr.sin_addr.s_addr = inet_addr("ip"); if(bind(sockfd,(SP)&addr,sizeof(addr))) { perror("bind"); return -1; } for(;;) { char buf[256] = {}; socklen_t len; recvfrom(sockfd,buf,sizeof(buf),0,(SP)&src_addr,&len); printf("recv:%s\n",buf); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } sendto(sockfd,"hehe",5,0,(SP)&src_addr,len); } close(sockfd); }
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client.c
#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> typedef struct sockaddr* SP; int main() { int sockfd = socket(AF_INET,SOCK_DGRAM,0); if(0 > sockfd) { perror("socket"); return -1; } // 目标地址 struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(端口号); addr.sin_addr.s_addr = inet_addr("目标ip"); for(;;) { char buf[256] = {}; printf(">"); gets(buf); sendto(sockfd,buf,strlen(buf)+1,0,(SP)&addr,sizeof(addr)); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } socklen_t len; recvfrom(sockfd,buf,sizeof(buf),0,(SP)&addr,&len); printf("%s\n",buf); } close(sockfd); }
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二、TCP通信
server.c
#include <stdio.h> #include <string.h> #include <unistd.h> #include <pthread.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> typedef struct sockaddr* SP; void* run(void* arg) { // 备份客户端描述符 int clifd = *(int*)arg; for(;;) { char buf[256] = {}; int ret = read(clifd,buf,sizeof(buf)); if(0 > ret) { printf("客户端异常结束!\n"); break; } printf("recv:%s\n",buf); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } write(clifd,"xixi",5); } close(clifd); } int main() { // 创建socket int sockfd = socket(AF_INET,SOCK_STREAM,0); if(0 > sockfd) { perror("sockfd"); return -1; } // 准备地址 struct sockaddr_in addr,cliaddr; addr.sin_family = AF_INET; addr.sin_port = htons(端口号); addr.sin_addr.s_addr = inet_addr("ip"); // 绑定 if(bind(sockfd,(SP)&addr,sizeof(addr))) { perror("bind"); return -1; } // 监听 listen(sockfd,10); // 等待连接 for(;;) { socklen_t len; // 等待客户端连接并获取描述符 int clifd = accept(sockfd,(SP)&cliaddr,&len); // 创建线程为客户端服务 pthread_t tid; pthread_create(&tid,NULL,run,&clifd); usleep(500); } }
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client.c
#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> typedef struct sockaddr* SP; int main() { int sockfd = socket(AF_INET,SOCK_STREAM,0); if(0 > sockfd) { perror("socket"); return -1; } struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(端口号); addr.sin_addr.s_addr = inet_addr("目标ip"); if(connect(sockfd,(SP)&addr,sizeof(addr))) { perror("connect"); return -1; } for(;;) { char buf[256] = {}; printf(">"); gets(buf); write(sockfd,buf,strlen(buf)+1); if(!strcmp("quit",buf)) { printf("通信结束!\n"); break; } read(sockfd,buf,sizeof(buf)); printf("server:%s\n",buf); } close(sockfd); }
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