问题描述
我已经从unix网络编程的书中实现了echo客户服务器,我感兴趣的是从client-> server发送msg的client_msg函数,还有将消息回显给客户端的str_echo很好,这是有代码:
ssize_t
readLine(int fd,void* str,size_t len)
{
size_t nleft = len ;
ssize_t nread;
char *ptr = (char*)str,c;
int i;
for( i = 1 ; i <= len ; i++ ) // for(char* ptr ; *ptr ; ptr++) for pointers and tables .
{
again :
if((nread = read(fd,&c,1)) == 1)
{
*ptr++ = c ;
if( c == '\n')
{
break; // end of line .
}
}
else if(nread == 0)
{
*ptr = 0 ;
return i-1; // EOF .
}
else
{
if(errno == EINTR)
goto again ;
return (-1);
}
}
*ptr = 0;
return i;
}
/ ============================================== =============== /
void
cli_msg(int fd)
{
char msg[MAXLINE],msgTmp[MAXLINE*2];
ssize_t n;
const char EOS[5] = "exit";
while( fgets(msg,MAXLINE,stdin) != NULL)
{
if(printf("test exit word %s->%s|\n",EOS,msg) && !strncmp(EOS,msg,sizeof EOS -1))
{
printf("in the if statement strncmp\n");
break;
}
if( (n = writen(fd,strlen(msg)) > 0))
printf("data is sent --------------------------------------->\n");
else
{
printf("WRITE ERROR : %s\n",strerror(errno) );
exit(EXIT_FAILURE);
}
if((n = readLine(fd,MAXLINE)) <= 0 ) // the error is that readn doesn't work .
{
printf("READLINE ERROR : %s ",strerror(errno));
exit(0);
}
puts(msg);
}
return ;
}
/ ============================================ ========= / str_echo:
void str_echo(int fd)
{
char buffer[MAXLINE];
int nread;
again:
while((nread = readLine(fd,buffer,MAXLINE)) > 0 )
{
printf("data is caught -> %s\n",buffer);
writen(fd,strlen(buffer));
}
if(!nread)
printf("client exit prematurly ...\n");
/*else if(nread < 0 && errno == EINTR) // read process interrupted
goto again;*/
else if(nread < 0)
{
printf("READ ERROR : %s\n",strerror(errno));
exit(0);
}
return;
}
问题是当我写的字符串的大小大于MAXLINE(MAXLINE = 10)时,客户端和服务器块(我想当服务器捕获消息时,它会寻找\ 0,但找不到它阻塞,并且客户端阻塞了对read的调用) 我该如何解决这个问题,并使程序在stdin中分配缓冲区,并根据MAXLINE值tnx世界进行调整:
解决方法
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