大家看看我的程序,谢谢(80),先给20,解决后再给60
下面是小弟写的一个SOCKET程序,但是假如通过windows下的客户端连接他,并发送数据,它可以显示有客户端连接进来,但无法收到客户端发来的数据.怎么会事.谢谢大家.
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdio.h>
#include <strings.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#define SA struct sockaddr
#define MAXCLI 20
#define MAXLINE 4096 /* max text line length */
#define LISTENQ 1024 /* 2nd argument to listen() */
void sig_chld(int signo)
{
pid_t pid;
int stat;
while((pid = waitpid(-1,&stat,WNOHANG))> 0)
printf( "chile %d terminated\n ",pid);
return;
}
void myWork(int sockfd )
{
ssize_t n=0;
char buf[1025];
fd_set rset;
struct timeval timeout;
timeout.tv_sec=2;
timeout.tv_usec=0;
bzero(&buf,sizeof(buf));
printf( "i am in myWork ");
again:
while((n=read(sockfd,buf,1024))> 0)
{
printf( "[%d] the message is: %s ",getpid(),buf);
bzero(&buf,sizeof(buf));
//write(sockfd, "hello client1\n ",sizeof( "hello client1\n "));
}
if(n <0 && errno==EINTR)
goto again;
else if (n <0)
printf( "str_echo: read error ");
/* FD_ZERO(&rset);
FD_SET(sockfd,&rset);
select(sockfd+1,&rset,NULL,NULL,&timeout);
if (FD_ISSET(sockfd,&rset))
{
n = read(sockfd,(void*)buf,1024);
printf( "the n is: %d\n ", n);
printf( "the content is: %s\n ",buf);
}
else
printf( "no \n ");*/
}
int setIP(sockaddr_in& sock_addr, char* IP_Addr, int port)
{
bzero(&sock_addr,sizeof(sock_addr));
sock_addr.sin_family = AF_INET;
sock_addr.sin_port = htons(port);
inet_pton(AF_INET,IP_Addr, &sock_addr.sin_addr);
}
int main(int argc, char *argv[])
{
// printf( "begin get remote url....\n ");
// xml_Parser myParser = xml_Parser( "http://192.168.103.67 ");
sockaddr_in server_addr,cli_addr;
int listenfd,clifd;
socklen_t len;
pid_t childpid;
int n,flag=1;
char* buf;
printf( "begin connect...\n ");
setIP(server_addr, "192.168.103.64 ",9000);
listenfd = socket(AF_INET,SOCK_STREAM,0);
if( setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &flag, len) == -1)
{
perror( "setsockopt ");
exit(1);
}
bind(listenfd,(struct sockaddr*)&server_addr,sizeof(server_addr));
listen(listenfd,LISTENQ);
//Signal(SIGCHLD,sig_chld);
for(;;)
{
len = sizeof(cli_addr);
printf( "wait for connect\n ");
if((clifd = accept(listenfd,(struct sockaddr*)&cli_addr,&len) <0))
{
if (errno == EINTR)
continue;
else
//err_sys( "accept error ");
printf( "accept error ");
printf( "error ");
}
printf( "the IP is:%s\n ",inet_ntoa(cli_addr.sin_addr));
printf( "the Port is: %d\n ",ntohs(cli_addr.sin_port));
printf( "have a connect\n ");
myWork(clifd);
if((childpid=fork())==0)
{
printf( "begin myWork1\n ");
close(listenfd);
printf( "begin myWork2\n ");
myWork(clifd);
printf( "begin myWork3\n ");
exit(0);
}
if (childpid <0)
printf( "fork error\n ");
printf( "hello over\n ");
close(clifd);
}
}
[解决办法]
看了半天你的程序，实在难看~~
注释太少了~~~~~~哎~~~~~~估计楼主应该是个新手~~至少在写程序方面~~~
[解决办法]
你怎么有两个myWork,第一个会停在那里，等到收到数据应该会打出来。
myWork(clifd);
if((childpid=fork())==0)
{
printf( "begin myWork1\n ");
close(listenfd);
printf( "begin myWork2\n ");
myWork(clifd);
printf( "begin myWork3\n ");
exit(0);
}
if (childpid <0)
printf( "fork error\n ");
printf( "hello over\n ");
close(clifd);
假设你没有第一个myWork,才会启动子进程，里面调用myWork,这时，你的main主线程可能在子进程收到数据之前将clifd关闭。这样子就永远看不到数据了。
------解决方案--------------------
main里面好乱, 看到这样的程序头就大了.
[解决办法]
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