linux 下实现服务器与客户端连接小例子
来源:互联网 发布:程序员猝死 知乎 编辑:程序博客网 时间:2024/06/05 10:06
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- #include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
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- int main(int argc, char *argv[])
- {
- int sockfd,new_fd;
- struct sockaddr_in server_addr;
- struct sockaddr_in client_addr;
- int sin_size,portnumber;
- char hello[]="Hello! Are You Fine?\n";
-
- if((portnumber=atoi("8080"))<0)
- {
- fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
- exit(1);
- }
-
-
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
- {
- fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
- exit(1);
- }
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- bzero(&server_addr,sizeof(struct sockaddr_in));
- server_addr.sin_family=AF_INET;
- server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
- server_addr.sin_port=htons(portnumber);
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-
- if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
- {
- fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
- exit(1);
- }
-
-
- if(listen(sockfd,5)==-1)
- {
- fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
- exit(1);
- }
-
- while(1)
- {
- fprintf(stderr, "server is listening!\n");
-
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- sin_size=sizeof(struct sockaddr_in);
- if( ( new_fd = accept(sockfd,(struct sockaddr *)(&client_addr),(socklen_t*)&sin_size ) ) == -1)
- {
- fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
- exit(1);
- }
-
- fprintf(stderr,"Server get connection from %s\n",
- inet_ntoa(client_addr.sin_addr));
- if(write(new_fd,hello,strlen(hello))==-1)
- {
- fprintf(stderr,"Write Error:%s\n",strerror(errno));
- exit(1);
- }
-
- close(new_fd);
-
- }
- close(sockfd);
- exit(0);
- }
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
-
- int main(int argc, char *argv[])
- {
- int sockfd;
- char buffer[1024];
- struct sockaddr_in server_addr;
- struct hostent *host;
- int portnumber,nbytes;
-
- if((host=gethostbyname("10.1.39.93"))==NULL)
- {
- fprintf(stderr,"Gethostname error\n");
- exit(1);
- }
-
- if((portnumber=atoi("8080"))<0)
- {
- fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
- exit(1);
- }
-
-
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
- {
- fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
- exit(1);
- }
-
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- bzero(&server_addr,sizeof(server_addr));
- server_addr.sin_family=AF_INET;
- server_addr.sin_port=htons(portnumber);
- server_addr.sin_addr=*((struct in_addr *)host->h_addr);
-
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- if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
- {
- fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
- exit(1);
- }
-
-
- if((nbytes=read(sockfd,buffer,1024))==-1)
- {
- fprintf(stderr,"Read Error:%s\n",strerror(errno));
- exit(1);
- }
- buffer[nbytes]='\0';
- printf("I have received:%s\n",buffer);
-
- close(sockfd);
- exit(0);
- }