?? echoserver.cc
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#include <iostream>using namespace std;#include <sys/socket.h>#include <arpa/inet.h>#include <netinet/in.h>#include <unistd.h>#include <fcntl.h>#include <cstring>#include <signal.h>#include <sys/wait.h>void err(const char* msg){ cout << msg << " error!" << endl; exit(-1);}void func(int sig){ signal(sig, func); while(waitpid(-1,NULL,WNOHANG)>0);}int main(){ signal(SIGCHLD, func); short port; cout << "input port:"; cin >> port; sockaddr_in si; si.sin_family = AF_INET; si.sin_addr.s_addr = htonl(INADDR_ANY); si.sin_port = htons(port); int s = socket(AF_INET,SOCK_STREAM,0); if(s<0) err("socket"); socklen_t len=sizeof(si); if(bind(s, (sockaddr*)&si, len)<0) err("bind"); if(listen(s, 20)<0) err("listen"); for(;;){ int c=accept(s,(sockaddr*)&si,&len); if(c<0) continue; if(fork()!=0){ close(c); continue; } close(s); char buf[1000]="Your IP: "; char ip[100]; inet_ntop(AF_INET,&si.sin_addr,ip,100); strcat(buf, ip); strcat(buf, "\n"); cout << ip << "到此一游" << endl; write(c, buf, strlen(buf)); for(;;){ int n=read(c, buf, 1000); if(n<=0) break; if(buf[0]=='q') break; buf[n] = '\0'; cout << ip << ':' << buf <<endl; write(c, buf, n); } close(c); exit(0); }}?? 快捷鍵說明
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