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deb-mbse/lib/test.c
2001-08-17 05:46:24 +00:00

107 lines
3.1 KiB
C

/*
** NOTE: Running this program in a Win32 or Unix environment
** will probably result in a segmentation fault or protection
** error. These errors may be caused by MEMWATCH when it's
** looking at memory to see if it owns it, or may be caused by
** the test program writing to memory it does not own.
**
** MEMWATCH has two functions called 'mwIsReadAddr()' and
** 'mwIsSafeAddr()', which are system-specific.
** If they are implemented for your system, and works
** correctly, MEMWATCH will identify garbage pointers and
** avoid causing segmentation faults, GP's etc.
**
** If they are NOT implemented, count on getting the core
** dumped when running this test program! As of this writing,
** the safe-address checking has been implemented for Win32
** and ANSI-C compliant systems. The ANSI-C checking traps
** SIGSEGV and uses setjmp/longjmp to resume processing,
** but I've only tested this under Linux (where it works).
**
** Note for Win95 users: The Win32 IsBadReadPtr() and it's
** similar functions can return incorrect values. This has
** not happened under WinNT, though, just Win95.
**
** 980318 Johan Lindh
**
*/
#include "libs.h"
#error "Hey! Don't just compile this program, read the comments first!"
#ifndef SIGSEGV
#error SIGNAL.H does not define SIGSEGV; running this program WILL cause a core dump/crash!
#endif
main()
{
char *p;
/* Collect stats on a line number basis */
mwStatistics( 2 );
/* Slows things down, but OK for this test prg */
/* mwAutoCheck( 1 ); */
TRACE("Hello world!\n");
p = malloc(210);
free(p);
p = malloc(20);
p = malloc(200); /* causes unfreed error */
p[-1] = 0; /* causes underflow error */
free(p);
p = malloc(100);
p[ -(int)(sizeof(long)*8) ] = -1; /* try to damage MW's heap chain */
free( p ); /* should cause relink */
mwSetAriFunc( mwAriHandler );
ASSERT(1==2);
mwLimit(1000000);
mwNoMansLand( MW_NML_ALL );
/* These may cause a general protection fault (segmentation fault) */
/* They're here to help test the no-mans-land protection */
if( mwIsSafeAddr(p+50000,1) ) {
TRACE("Killing byte at %p\n", p+50000);
*(p+50000) = 0;
}
if( mwIsSafeAddr(p+30000,1) ) {
TRACE("Killing byte at %p\n", p+30000);
*(p+30000) = 0;
}
if( mwIsSafeAddr(p+1000,1) ) {
TRACE("Killing byte at %p\n", p+1000);
*(p+1000) = 0;
}
if( mwIsSafeAddr(p-100,1) ) {
TRACE("Killing byte at %p\n", p-100);
*(p-100) = 0;
}
/* This may cause a GP fault as well, since MW data buffers */
/* have been damaged in the above killing spree */
CHECK();
p = malloc(12000);
p[-5] = 1;
p[-10] = 2;
p[-15] = 3;
p[-20] = 4;
/* This may cause a GP fault since MW's buffer list may have */
/* been damaged by above killing, and it will try to repair it. */
free(p);
p = realloc(p,10); /* causes realloc: free'd from error */
/* May cause GP since MW will inspect the memory to see if it owns it. */
free( (void*)main );
return 0;
}