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- ;/* trap_c.c - Execute me to assemble/compile me with Lattice 5.04
- Asm -iH:include/ -otrap_a.o trap_a.asm
- LC -b1 -cfistq -v -y -j73 trap_c.c
- Blink FROM LIB:c.o,trap_c.o,trap_a.o TO trap LIBRARY LIB:LC.lib,LIB:Amiga.lib
- quit
- */
-
- /* Trap_c.c - C module of sample integer divide-by-zero trap
- *
- * Copyright (c) 1990 Commodore-Amiga, Inc.
- *
- * This example is provided in electronic form by Commodore-Amiga, Inc. for
- * use with the 1.3 revisions of the Addison-Wesley Amiga reference manuals.
- * The 1.3 Addison-Wesley Amiga Reference Manual series contains additional
- * information on the correct usage of the techniques and operating system
- * functions presented in this example. The source and executable code of
- * this example may only be distributed in free electronic form, via bulletin
- * board or as part of a fully non-commercial and freely redistributable
- * diskette. Both the source and executable code (including comments) must
- * be included, without modification, in any copy. This example may not be
- * published in printed form or distributed with any commercial product.
- * However, the programming techniques and support routines set forth in
- * this example may be used in the development of original executable
- * software products for Commodore Amiga computers.
- * All other rights reserved.
- * This example is provided "as-is" and is subject to change; no warranties
- * are made. All use is at your own risk. No liability or responsibility
- * is assumed.
- *
- */
-
- #include <exec/types.h>
- #include <exec/tasks.h>
- #ifdef LATTICE
- #include <proto/all.h>
- #include <stdlib.h>
- #include <stdio.h>
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- int chkabort(void) { return(0); } /* really */
- #endif
-
- /* assembler trap code in trap_a.asm */
- extern ULONG trapa();
-
- APTR oldTrapCode;
- ULONG countdiv0;
-
- void main(int argc,char **argv)
- {
- struct Task *thistask;
- ULONG k,j;
-
- thistask = FindTask(NULL);
-
- /* Save our task's current trap code pointer */
- oldTrapCode = thistask->tc_TrapCode;
-
- /* Point task to our assembler trap handler code
- * Ours will just count divide-by-zero traps, and
- * pass other traps on to the normal TrapCode
- */
- thistask->tc_TrapCode = (APTR)trapa;
-
- countdiv0 = 0L;
- /* Let's divide by zero a few times */
- for(k=0; k<4; k++)
- {
- printf("dividing %ld by zero... ",k);
- j = k/0L;
- printf("did it\n");
- }
- printf("\nDivide by zero happened %ld times\n",countdiv0);
-
- /* Restore old trap code */
- thistask->tc_TrapCode = oldTrapCode;
- }
-
-
-