badserver socket
代码是《linux高级程序设计》第5章的内容mqq@208_181:~/fabricehao/test/20120726> cat errtcpserver.c #include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>int main(int args,char * argv){ int i,s,fd,len; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; int sin_size; char buf; memset(&my_addr,0,sizeof(my_addr)); my_addr.sin_family=AF_INET; my_addr.sin_addr.s_addr=INADDR_ANY; unsigned int pp=87654; my_addr.sin_port=htons(pp); if((s=socket(AF_INET,SOCK_STREAM,0))<0){ perror("socket"); return 1; } if(bind(s,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0){ perror("bind"); return 1; } listen(s,5); sin_size=sizeof(struct sockaddr_in); if((fd=accept(s,(struct sockaddr *)&remote_addr,&sin_size))<0) { perror("accept"); return 1; } printf("accept client %s\n",inet_ntoa(remote_addr.sin_addr)); len=send(fd,"welcome to my server\n",21,0); for(i=0;i<5;i++){ len=recv(fd,buf,BUFSIZ,0); buf='\0'; printf("%s\n",buf); } close(fd); close(s); return 0;}
mqq@208_181:~/fabricehao/test/20120726> cat badclient.c #include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(args,argv){ int i,s,fd,len; struct sockaddr_in remote_addr; int sin_size; char buf; memset(&remote_addr,0,sizeof(remote_addr)); remote_addr.sin_family=AF_INET; remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1"); unsigned int pp=87654; remote_addr.sin_port=htons(pp); if((s=socket(AF_INET,SOCK_STREAM,0))<0){ perror("socket"); return 1; } if(connect(s,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr))<0){ perror("connect"); return 1; } printf("connect to server"); len=recv(s,buf,BUFSIZ,0); buf='\0'; printf("%s",buf); len=send(s,"test1 message",13,0); len=send(s,"test2 message",13,0); len=send(s,"test3 message",13,0); len=send(s,"test4 message",13,0); len=send(s,"test5 message",13,0); close(s); return 0;}
betterserver.c
len=recv(fd,buf,13,0);指定了缓冲
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>int main(int args,char * argv){ int i,s,fd,len; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; int sin_size; char buf; memset(&my_addr,0,sizeof(my_addr)); my_addr.sin_family=AF_INET; my_addr.sin_addr.s_addr=INADDR_ANY; unsigned int pp=87654; my_addr.sin_port=htons(pp); if((s=socket(AF_INET,SOCK_STREAM,0))<0){ perror("socket"); return 1; } if(bind(s,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0){ perror("bind"); return 1; } listen(s,5); sin_size=sizeof(struct sockaddr_in); if((fd=accept(s,(struct sockaddr *)&remote_addr,&sin_size))<0) { perror("accept"); return 1; } printf("accept client %s\n",inet_ntoa(remote_addr.sin_addr)); len=send(fd,"welcome to my server\n",21,0); for(i=0;i<5;i++){ len=recv(fd,buf,13,0); buf='\0'; printf("%s\n",buf); } close(fd); close(s); return 0;}
liburl使用
mqq@208_181:~/fabricehao/test/20120726> cat liburl.c #include <stdio.h>#include <curl/curl.h>int main(int args,char * argv){ CURL * curl; CURLcode res; curl =curl_easy_init(); if(!curl) { perror("curl"); return 1; } curl_easy_setopt(curl,CURLOPT_URL,argv); curl_easy_setopt(curl,CURLOPT_PROXY,"webproxy:8080"); res=curl_easy_perform(curl); curl_easy_cleanup(curl); return 0;}
yum install libcurl-devel
这个是依赖
gcc -I /usr/local/include/ -o getweb liburl.c -lcurl
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