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service
#include<stdio.h> #include <sys/types.h> #include <sys/wait.h> #include <signal.h> #include<unistd.h> #include<string.h> #include<strings.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include<stdlib.h> #define PORT 5001 #define STR_QUIT "quit" void child_data_handle(int signum) { if(SIGCHLD == signum) { waitpid(-1,NULL,WNOHANG); } } void* client_data_handle(void* arg); int main() { int fd = -1; int newfd = -1; pid_t pid; signal(SIGCHLD,child_data_handle); fd = socket(AF_INET,SOCK_STREAM,0); if(fd<0) { perror("socket"); exit(1); } struct sockaddr_in sin; bzero(&sin,sizeof(sin)); sin.sin_family = AF_INET; sin.sin_port = htons(PORT); sin.sin_addr.s_addr = INADDR_ANY; if(bind(fd,(struct sockaddr *)&sin,sizeof(sin))<0) { perror("bind"); exit(1); } if(listen(fd,5)<0) { perror("listen"); exit(1); } pid_t pid; int newfd = -1; struct sockaddr_in cin; bzero(&sin,sizeof(cin)); socklen_t sockaddr_len = sizeof(cin); while(1) { newfd = accept(fd,(struct sockaddr *)&cin.sin_addr,&sockaddr_len); if(newfd<0) { perror("accept"); exit(1); } pid = fork(); if(pid<0) { perror("fork"); exit(1); } if(pid == 0) { char ipv4[16]; if(!inet_ntop(newfd,(void *)&cin.sin_addr,ipv4,sizeof(cin))) { perror("inet_ntop"); exit(1); } printf("client (%s,%d) is connect\n",ipv4,ntohs(cin.sin_port)); client_data_handle(&newfd); close(fd); } if(pid>0) { close(newfd); } } close(fd); return 0; } void* client_data_handle (void* arg) { char buf[1024]; int newfd = *(int*)arg; int ret =-1; printf("child handle process:newfd = %d\n",newfd); while(1) { do{ ret = read(newfd,&buf,1023); }while(ret<1); if(!ret) { break; } if(ret<0) { exit(1); } printf("receive data is %s\n",buf); if(!strncasecmp(buf,STR_QUIT,strlen(STR_QUIT))) { printf("client is exiting!"); break; } } } client
#include<stdio.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/ip.h> /* superset of previous */ #include<stdlib.h> #include <strings.h> #include<unistd.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/types.h> /* See NOTES */ #include <sys/socket.h> //./client 192.168.182.144 5001 #define SERV_PORT 5001 #define SERV_IP_ADDR "192.168.157.34" #define BUFSIZE 1024 #define QUIT_STR "QUIT" int main(int argc,char **argv) { int fd = -1; if(argc!=3) { exit(1); } int port = -1; port = atoi(argv[2]); fd = socket(AF_INET,SOCK_STREAM,0); if(fd<0) { perror("socket"); exit(1); } struct sockaddr_in sin; bzero(&sin,sizeof(sin)); sin.sin_family = AF_INET; sin.sin_port = htons(port); sin.sin_addr.s_addr = inet_addr(argv[1]); if(connect(fd,(struct sockaddr*)&sin,sizeof(sin))<0) { perror("connect"); exit(1); } char buf[BUFSIZE]; while(1) { bzero(buf,BUFSIZE); if(fgets(buf,BUFSIZE-1,stdin)==NULL) { continue; } write(fd,buf,strlen(buf)); if(!strncasecmp(buf,QUIT_STR,strlen(QUIT_STR))) { break; } } return 0; } 结果
