Hi,Erwin,
Thank you very much!
>AFAIK ignoring SIGCHILD with signal(SIGCHILD,SIG_IGN);
>is enough to prevent zombies.
This method just workes under the SYSV and UNIX98,but Posix.1
doesn't surport it.So under the rtlinux,this method couldn't work.
Hope you could give me the other method.
Thx
Lichow
Leechow wang wrote:
>
> Hi,all,
> I wrote a simple listening socket program.The father forks the two child
> progresses.One is reporting the status of the system;the other is dealing
> with the network service --just dealing with the client requirement
through
> the network. I use the signal function to deal with the child progress.
But
> when it run,it creates too many zombie progresses.I don't what's the
> problem. Could anyone give me a hand? the below is my code:
>
> void sig_chld(int sig)
> {
> pid_t pid;
> int stat
> while((pid=waitpid(-1,&stat,WNOHANG)) >0);
> return;
> }
>
> main ()
> {
> ...
> signal(SIGCHLD,&sig_chld);/*dealing the child progress*/
> if (!fork()){
> /* Reading the status of the system*/
> }
>
> while(1)
> {
> sin_size = sizeof(struct sockaddr_in);
> new_fd=accept(sock_fd,(struct sockaddr *)&their_addr,&sin_size));
> if (!fork()) {
> /*the child progress deals with the network requirment
> ...
> */
> close(new_fd);
> exit(0);
> }
> else
> {
>
> }
> }
> close(sock_fd);
> exit(0);
> }
>
> Thanks in advance!
>
> Lichow
>
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