0
/* Fig. 14.8: fig14_08.c
Using signal handling */
1.
include <stdio.h>
2.
include <stdlib.h>
3.
include <signal.h>
4.
include <stdlib.h>
5.
include <time.h>
void signalHandler( int signalValue ); /* prototype */
int main()
{
int i; /* counter used to loop 100 times */
int x; /* variable to hold random values between 1-50 */
signal( SIGINT, signalHandler ); /* register signal handler */
srand( clock() );
/* output numbers 1 to 100 */
for ( i = 1; i <= 100; i++ ) {
x = 1 + rand() % 50; /* generate random number to raise SIGINT */
/* raise SIGINT when x is 25 */
if ( x
25 ) {
raise( SIGINT );
} /* end if */
printf( "%4d", i );
/* output n when i is a multiple of 10 */
if ( i % 10
0 ) {
printf( "n" );
} /* end if */
} /* end for */
printf("nn");
system("pause");
return 0; /* indicates successful termination */
} /* end main */
/* handles signal */
void signalHandler( int signalValue )
{
int response; /* user's response to signal (1 or 2) */
printf( "%s%d%sn%s",
"nInterrupt signal ( ", signalValue, " ) received.",
"Do you wish to continue ( 1 = yes or 2 = no )? " );
scanf( "%d", &response );
/* check for invalid responses */
while ( response != 1 && response != 2 ) {
printf( "( 1 = yes or 2 = no )? " );
scanf( "%d", &response );
} /* end while */
/* determine if it is time to exit */
if ( response == 1 ) {
/* reregister signal handler for next SIGINT */
signal( SIGINT, signalHandler );
} /* end if */
else {
exit( EXIT_SUCCESS );
} /* end else */
} /* end function signalHandler */
/***
* (C) Copyright 1992-2004 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
***/
