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源程序服务器端如下:
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
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 (argc!=2)
{
printf("Usage:%s portnumber\a\n",argv[0]);
exit(1);
}
if ((portnumber=atoi(argv[1]))<0)
{
printf("Usage:%s portnumber\a\n",argv[0]);
exit(1);
}
/*服务器端开始建立socket描述符*/
if ((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
printf("Socket error: %s\n\a",strerror(errno));
exit(1);
}
/*服务器端填充sockaddr结构*/
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);
/*捆绑sockfd描述符*/
if (bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
printf("Bind error: %s\n\a",strerror(errno));
exit(1);
}
/*监听sockfd描述符*/
if (listen(sockfd,5)==-1)
{
printf("Listen error:%s \n\a",strerror(errno));
exit(1);
}
while(1)
{
/*服务器阻塞,直到客户程序建立连接*/
sin_size=sizeof(struct sockaddr_in);
if ((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
{
printf("Accept error:%s \n\a",strerror(errno));
exit(1);
}
printf("Server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
if (write(new_fd,hello,strlen(hello))==-1)
{
printf("Write Error:%s\n",strerror(errno));
exit(1);
}
/*这个通讯已经结束*/
close(new_fd);
/*循环下一个*/
}
close (sockfd);
exit(0);
}
调试环境是freebsd 4.4 ,运行make后提示如下错误
server.cpp: In function `int main(int, char **)':
server.cpp:64: passing `int *' as argument 3 of `accept(int, sockaddr *, socklen_t *)' changes signedness
server.cpp:69: implicit declaration of function `int inet_ntoa(...)'
server.cpp:70: implicit declaration of function `int write(...)'
server.cpp:76: implicit declaration of function `int close(...)'
*** Error code 1
这个例程是论坛中提供的《linux操作系统下c语言编程入门》,请问应当怎么改? |
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