#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>

#define LOOP_LIMIT  1E6

volatile int sigcount=0;

void catcher( int sig ) {
  printf( "Signal catcher called for signal %d\n", sig );
  sigcount = 1;
}

int main( int argc, char *argv[] ) {

  struct sigaction sact;
  volatile double count;
  time_t t;

  sigemptyset( &sact.sa_mask ); // set up the parameters for the alarm
  sact.sa_flags = 0;
  sact.sa_handler = catcher;
  sigaction( SIGALRM, &sact, NULL );
  // specifying the alarm and handler
  alarm(1);  /* timer will pop in 5 ms */

  time( &t );
  printf( "Before loop, time is %s", ctime(&t) );

  for( count=0; ((count<LOOP_LIMIT*1) && (sigcount==0)); count++ );

  time( &t );
  printf( "After loop, time is %s\n", ctime(&t) );

  if( sigcount == 0 )
    printf( "The signal catcher never gained control\n" );
  else
    printf( "The signal catcher gained control\n" );

  printf( "The value of count is %.0f\n", count );

  return( 0 );
}