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#include <stddef.h>

#include <signal.h>

#include <unistd.h>

int

system(command)

char * command;

{

   int wait_val, wait_ret, pid;

   __sighandler_t save_quit, save_int, save_chld;

   if( command == 0 ) return 1;

   save_quit = signal(SIGQUIT, SIG_IGN);

   save_int  = signal(SIGINT,  SIG_IGN);

   save_chld = signal(SIGCHLD, SIG_DFL);

   if( (pid=vfork()) < 0 )

   {

      signal(SIGQUIT, save_quit);

      signal(SIGINT,  save_int);

      signal(SIGCHLD, save_chld);

      return -1;

   }

   if( pid == 0 )

   {

      signal(SIGQUIT, SIG_DFL);

      signal(SIGINT,  SIG_DFL);

      signal(SIGCHLD, SIG_DFL);

      execl("/bin/sh", "sh", "-c", command, (char*)0);

      _exit(127);

   }

   /* Signals are not absolutly guarenteed with vfork */

   signal(SIGQUIT, SIG_IGN);

   signal(SIGINT,  SIG_IGN);

   printf("Waiting for child %d\n", pid);

   if (wait4(pid, &wait_val, 0, 0) == -1)

      wait_val = -1;

   signal(SIGQUIT, save_quit);

   signal(SIGINT,  save_int);

   signal(SIGCHLD, save_chld);

   return wait_val;

}