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- ;/* trap_c.c - Execute me to compile me with SAS C 5.10
- LC -b0 -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) 1992 Commodore-Amiga, Inc.
-
- This example is provided in electronic form by Commodore-Amiga, Inc. for
- use with the "Amiga ROM Kernel Reference Manual: Libraries", 3rd Edition,
- published by Addison-Wesley (ISBN 0-201-56774-1).
-
- The "Amiga ROM Kernel Reference Manual: Libraries" contains additional
- information on the correct usage of the techniques and operating system
- functions presented in these examples. The source and executable code
- of these examples 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- example may not be published in printed form or distributed with any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 these examples 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>
- #include <clib/exec_protos.h>
- #include <stdlib.h>
- #include <stdio.h>
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- int chkabort(void) {return(0); }
- #endif
-
- extern ULONG trapa(); /* assembler trap code in trap_a.asm */
-
- 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;
-
- for(k=0; k<4; k++) /* Let's divide by zero a few times */
- {
- printf("dividing %ld by zero... ",k);
- j = k/0L;
- printf("did it\n");
- }
- printf("\nDivide by zero happened %ld times\n",countdiv0);
-
- thistask->tc_TrapCode = oldTrapCode; /* Restore old trap code */
- }