Not smp releated but need help and i have one else to turn to butthis list server because you guys are the best of the best.

[Mariusz W Stanisz]

 This is a problem with using vfork in my simple program. After i run my
program and tell it to execlp a command it does it but most off the time i
get a race condition, and always execlp executes on both child and on the 
parent.
help please.
my simple program is the attachmnt



           

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

#define MAX_COMMAND 162

int main(void){
   int exit_code;
   pid_t running_ps,shell_ps;
   char command_line[MAX_COMMAND];  
   printf("--->");
   while(fgets(command_line,MAX_COMMAND,stdin)!=NULL){
      command_line[strlen(command_line)-1]=0;
      if(running_ps=vfork()<0){
        printf("Cant vfork a ps\n");
      }else if(running_ps == 0){
         execlp(command_line,command_line,(char *) 0);
      }
      if(running_ps=waitpid(running_ps,&exit_code,0)<0) {
        printf("cant waitpid \n");
      }
      printf("--->");
   }
}