// Spusti program s timeoutom v sekundach ..
// program musi byt cele meno na subor bez shellu ... napr
// spustnacas 10 /bin/ls -lR /
// bbo 28.10.2001
  #include <stdlib.h>
  #include <unistd.h>
  #include <stdio.h>
  #include <signal.h>
  #include <errno.h>
  #include <sys/types.h>
  #include <sys/wait.h>
 
int pid;

void alrm_handler()
{
	printf("\nTIMEOUT ALARM:%d\n",pid);
	alarm(1);
	kill(pid,SIGKILL);
}

int main(int argc, char *argv[])
{
    int a,cas;
    if (argc<3) {printf("cas cesta/prikaz arguemnty\n");exit (-1);}
    if( sscanf(argv[1],"%d",&cas) !=1 )
	{printf("chyba v case\n");exit (-1);}
    signal(SIGALRM, alrm_handler);
    alarm(cas);
for(a=2;a<argc;a++)
  argv[a-2]=argv[a];
argv[argc-2]=NULL;
 a=my_system(argv[0],argv);
 exit(a);
}
// zobrane z man .. aby nebol ziaden dalsi proces naviac zo system ..
// ale opravene lebo .. poznamka ze netestovane bola namieste ..
      int my_system (char *command,char *argv[]) {
           int status;

           if (command == 0)
               return 1;
           pid = fork();
           if (pid == -1)
               return -1;
           if (pid == 0) {
               execv(command, argv);
               exit(127);
           }
           do {
               if (waitpid(pid, &status, 0) == -1) {
                   if (errno != EINTR)
                       return -1;
               }
	       if (WIFEXITED(status))
			return WEXITSTATUS(status);
	       return -1;
           } while(1);
	}