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进程
代码
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>#include <unistd.h>#include <stdlib.h>#include <signal.h>#include <sys/wait.h>#define PORT 8888#define IP "192.168.124.62" #define ERR_MSG(msg) do{\fprintf(stderr,"line=%d",__LINE__);\perror(msg);\}while(0)void handler(int sig){while(waitpid(-1,NULL,WNOHANG)>0);}int main(int argc, const char *argv[]){//创建套接字int fd = socket(AF_INET,SOCK_STREAM,0);if(fd<0){ERR_MSG("socket");return -1;}printf("-流式套接字\n");//捕获17号信息SIGCHLDif(signal(17,handler) == SIG_ERR){ERR_MSG("signal");return -1;}//允许端口号重复使用int reuse = 1;if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0){ERR_MSG("setsockopt");return -1;}printf("端口允许快速重用\n");//创建一个地址信息结构体,bind绑定需要用到struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);//绑定ip和端口if(bind(fd,(struct sockaddr*)&sin,sizeof(sin))<0){ERR_MSG("bind");return -1;}printf("绑定成功\n");//将套接字设置为监听状态if(listen(fd,128)<0){ERR_MSG("listen");return -1;}printf("监听成功\n");int newfd;pid_t pid;struct sockaddr_in cin;socklen_t socklen = sizeof(cin);while(1){//获取连接成功的套接字,用于阻塞等待连接newfd = accept(fd,(struct sockaddr*)&cin,&socklen);if(newfd <0){ERR_MSG("accept");return -1;}printf("[%s:%d]客户端连接成功%d\n",inet_ntoa(sin.sin_addr),ntohs(sin.sin_port),newfd);pid = fork();if(pid == 0){close(fd);//接收与发送char buf[128];ssize_t size;while(1){//接收//bzero(buf,sizeof(buf));//清空数组内容// size = read(newfd,buf,sizeof(buf));size = recv(newfd,buf,sizeof(buf),0);// size = recvfrom(newfd,buf,sizeof(buf),0,NULL,NULL);if(size<0){ERR_MSG("recv");return -1;}else if(size==0){printf("[%s:%d]客户端下线\n",inet_ntoa(sin.sin_addr),ntohs(sin.sin_port));break;}printf("[%s:%d]接收成功newfd=%d:%s\n",inet_ntoa(sin.sin_addr),ntohs(sin.sin_port),newfd,buf);//发送printf("服务器回复>>>>");fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1] = '\0';if(send(newfd,buf,sizeof(buf),0)<0){ERR_MSG("send");break;}printf("发送成功\n");}close(newfd);exit(0);}close(newfd);}close(fd);return 0;}
运行结果图:
线程
代码:
1 #include <stdio.h>2 #include <sys/types.h>3 #include <sys/socket.h>4 #include <netinet/in.h>5 #include <arpa/inet.h>6 #include <string.h>7 #include <unistd.h>8 #include <stdlib.h>9 #include <signal.h>10 #include <sys/wait.h>11 #include <pthread.h>12 13 #define PORT 888814 #define IP "192.168.124.62"15 #define ERR_MSG(msg) do{\16 fprintf(stderr,"line=%d",__LINE__);\17 perror(msg);\18 }while(0)19 20 struct msg21 {22 int newfd;23 struct sockaddr_in cin;24 };25 void* huidiaolist(void* arg);26 int main(int argc, const char *argv[])27 {28 //创建套接字29 int fd = socket(AF_INET,SOCK_STREAM,0);30 if(fd<0)31 {32 ERR_MSG("socket");33 return -1;34 }35 printf("-流式套接字\n");36 //允许端口号重复使用37 int reuse = 1;38 if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)39 {40 ERR_MSG("setsockopt");41 return -1;42 }43 printf("端口允许快速重用\n");44 //创建一个地址信息结构体,bind绑定需要用到45 struct sockaddr_in sin;46 sin.sin_family = AF_INET;47 sin.sin_port = htons(PORT);48 sin.sin_addr.s_addr = inet_addr(IP);49 //绑定ip和端口50 if(bind(fd,(struct sockaddr*)&sin,sizeof(sin))<0)51 {52 ERR_MSG("bind");53 return -1;54 }55 printf("绑定成功\n");56 57 //将套接字设置为监听状态58 if(listen(fd,128)<0)59 {60 ERR_MSG("listen");61 return -1;62 }63 printf("监听成功\n");64 65 int newfd;66 pid_t pid;67 struct sockaddr_in cin;68 socklen_t socklen = sizeof(cin);69 70 pthread_t tid;71 struct msg clinfo;72 while(1)73 {74 //获取连接成功的套接字,用于阻塞等待连接75 newfd = accept(fd,(struct sockaddr*)&cin,&socklen);76 if(newfd <0)77 {78 ERR_MSG("accept");79 return -1;80 }81 printf("[%s:%d]客户端连接成功%d\n",\82 inet_ntoa(sin.sin_addr),ntohs(sin.sin_port),newfd);83 84 clinfo.newfd = newfd;85 clinfo.cin = cin;86 if(pthread_create(&tid,NULL,huidiaolist,(void*)&clinfo)!=0)87 {88 fprintf(stderr,"line=%d",__LINE__);89 break;90 }91 pthread_detach(tid);92 }93 close(fd);94 95 return 0;96 }97 98 void* huidiaolist(void* arg)99 {
100 //接收与发送
101 int newfd = ((struct msg*)arg)->newfd;
102 struct sockaddr_in cin = ((struct msg*)arg)->cin;
103
104 char buf[128];
105 ssize_t size;
106 while(1)
107 {
108 //接收
109 //
110 bzero(buf,sizeof(buf));//清空数组内容
111 // size = read(newfd,buf,sizeof(buf));
112 size = recv(newfd,buf,sizeof(buf),0);
113 // size = recvfrom(newfd,buf,sizeof(buf),0,NULL,NULL);
114 if(size<0)
115 {
116 ERR_MSG("recv");
117 break;
118 }else if(size==0)
119 {
120 printf("[%s:%d]客户端下线\n",\
121 inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));
122 break;
123 }
124 printf("[%s:%d]接收成功newfd=%d:%s\n",\
125 inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
126
127
128 //发送
129 strcpy(buf,"回复");
130 if(send(newfd,buf,sizeof(buf),0)<0)
131 {
132 ERR_MSG("send");
133 break;
134 }
135 printf("发送成功\n");
136 }
137 close(newfd);
138 pthread_exit(NULL);
结果图:
广播
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>#define PORT 6667
#define IP "192.168.124.255"
#define ERR_MSG(msg) do{\fprintf(stderr,"line:%d\n",__LINE__);\perror(msg);\
}while(0)int main(int argc, const char *argv[])
{int fd = socket(AF_INET,SOCK_DGRAM,0);if(fd<0){ERR_MSG("scoket");return -1;}printf("创建流式套接字成功cd=%d\n",fd);//允许端口被重int reuse = 1;if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0){ERR_MSG("setsockopt");return -1;}printf("允许端口被重复使用\n");//允许广播if(setsockopt(fd,SOL_SOCKET,SO_BROADCAST,&reuse,sizeof(reuse))<0){ERR_MSG("setsockopt");return -1;}//绑定服务器地址信息,必须绑定struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr= inet_addr(IP);//绑定IP及端口号if(bind(fd,(struct sockaddr*)&sin,sizeof(sin))<0){ERR_MSG("bind");return -1;}printf("绑定成功\n");char arr[128];struct sockaddr_in cin;socklen_t addrlen = sizeof(arr);while(1){//发送数据printf("请输入数据>>>>>");fgets(arr,sizeof(arr),stdin);arr[strlen(arr)-1] = '\0';if(sendto(fd,arr,sizeof(arr),0,\(struct sockaddr*)&sin,sizeof(sin))<0) {ERR_MSG("sendto");return -1;}printf("发送成功\n");bzero(arr,sizeof(arr));}close(fd);return 0;
}
组播
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>#define PORT 6667
#define IP "224.1.2.3"
#define ERR_MSG(msg) do{\fprintf(stderr,"line:%d\n",__LINE__);\perror(msg);\
}while(0)int main(int argc, const char *argv[])
{int fd = socket(AF_INET,SOCK_DGRAM,0);if(fd<0){ERR_MSG("scoket");return -1; }printf("创建流式套接字成功cd=%d\n",fd);//允许端口被重int reuse = 1;if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0){ERR_MSG("setsockopt");return -1;}printf("允许端口被重复使用\n");//允许广播if(setsockopt(fd,SOL_SOCKET,SO_BROADCAST,&reuse,sizeof(reuse))<0){ERR_MSG("setsockopt");return -1;}//绑定服务器地址信息,必须绑定struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr= inet_addr(IP);//绑定IP及端口号if(bind(fd,(struct sockaddr*)&sin,sizeof(sin))<0){ERR_MSG("bind");return -1;}printf("绑定成功\n");char arr[128];struct sockaddr_in cin;socklen_t addrlen = sizeof(arr);while(1){//发送数据 printf("请输入数据>>>>>");fgets(arr,sizeof(arr),stdin);arr[strlen(arr)-1] = '\0';if(sendto(fd,arr,sizeof(arr),0,\(struct sockaddr*)&sin,sizeof(sin))<0){ERR_MSG("sendto");return -1;}printf("发送成功\n");bzero(arr,sizeof(arr));}close(fd);return 0;
}
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