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    下面一段代码算是一个完整的例子了, 纪念一下.

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

int main()
{
   pid_t pid;
  
   /* Remove the defunc pid in process table */
   signal(SIGCLD, SIG_IGN);

   while(true)
   {
      switch(pid=fork())
      {
         case -1:
           printf("Fork failured!\n");
           break;
         case 0:
           printf("This is child thread!\n");
           _exit(0);
           break;
         default:
           printf("Child process %d created!\n", pid);
           sleep(10);
           break;
      }
   }
}

    以前总是没有写signal一行.