diff options
Diffstat (limited to 'dmake/dbug/malloc/mlc_chn.c')
| -rw-r--r-- | dmake/dbug/malloc/mlc_chn.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/dmake/dbug/malloc/mlc_chn.c b/dmake/dbug/malloc/mlc_chn.c deleted file mode 100644 index a25d906b8..000000000 --- a/dmake/dbug/malloc/mlc_chn.c +++ /dev/null @@ -1,188 +0,0 @@ -/* - * (c) Copyright 1990 Conor P. Cahill (uunet!virtech!cpcahil). - * You may copy, distribute, and use this software as long as this - * copyright statement is not removed. - */ -#include <stdio.h> -#include <fcntl.h> -#include "malloc.h" - -/* - * Function: malloc_chain_check() - * - * Purpose: to verify malloc chain is intact - * - * Arguments: todo - 0 - just check and return status - * 1 - call malloc_warn if error detected - * - * Returns: 0 - malloc chain intact & no overflows - * other - problems detected in malloc chain - * - * Narrative: - * - * Notes: If todo is non-zero the malloc_warn function, when called - * may not return (i.e. it may exit) - * - */ -#ifndef lint -static -char rcs_hdr[] = "$Id: mlc_chn.c,v 1.1.1.1 2000-09-22 15:33:26 hr Exp $"; -#endif - - -int -malloc_chain_check(todo) - int todo; -{ - char * func = "malloc_chain_check"; - int i; - extern char * malloc_data_start; - extern char * malloc_data_end; - extern struct mlist * malloc_end; - extern int malloc_errno; - extern struct mlist malloc_start; - struct mlist * oldptr; - struct mlist * ptr; - int rtn = 0; - - oldptr = &malloc_start; - for(ptr = malloc_start.next; ; ptr = ptr->next) - { - /* - * Since the malloc chain is a forward only chain, any - * pointer that we get should always be positioned in - * memory following the previous pointer. If this is not - * so, we must have a corrupted chain. - */ - if( ptr ) - { - if(ptr < oldptr ) - { - malloc_errno = M_CODE_CHAIN_BROKE; - if( todo ) - { - malloc_fatal(func); - } - rtn++; - break; - } - oldptr = ptr; - } - else - { - if( oldptr != malloc_end ) - { - /* - * This should never happen. If it does, then - * we got a real problem. - */ - malloc_errno = M_CODE_NO_END; - if( todo ) - { - malloc_fatal(func); - } - rtn++; - } - break; - } - - /* - * verify that ptr is within the malloc region... - * since we started within the malloc chain this should never - * happen. - */ - - if( ((char *)ptr < malloc_data_start) || - ((char *)ptr > malloc_data_end) ) - { - malloc_errno = M_CODE_BAD_PTR; - if( todo ) - { - malloc_fatal(func); - } - rtn++; - break; - } - - /* - * verify magic flag is set - */ - - if( (ptr->flag&M_MAGIC) != M_MAGIC ) - { - malloc_errno = M_CODE_BAD_MAGIC; - if( todo ) - { - malloc_warning(func); - } - rtn++; - continue; - } - - /* - * verify segments are correctly linked together - */ - - if( (ptr->prev && (ptr->prev->next != ptr) ) || - (ptr->next && (ptr->next->prev != ptr) ) || - ((ptr->next == NULL) && (ptr->prev == NULL)) ) - { - malloc_errno = M_CODE_BAD_CONNECT; - if( todo ) - { - malloc_warning(func); - } - rtn++; - continue; - } - - /* - * If this segment is allocated - */ - - if( (ptr->flag & M_INUSE) != 0 ) - { - /* - * verify no overflow of data area - */ - - for(i=ptr->r_size; i < ptr->s.size; i++) - { - if( ptr->data[i] != M_FILL ) - { - malloc_errno = M_CODE_OVERRUN; - if( todo ) - { - malloc_warning(func); - } - rtn++; - break; - } - } - } - else /* it's not allocated so */ - { - /* - * verify no reuse of freed data blocks - */ - - for(i=0; i < ptr->s.size; i++) - { - if( ptr->data[i] != M_FREE_FILL ) - { - malloc_errno = M_CODE_REUSE; - if( todo ) - { - malloc_warning(func); - } - rtn++; - break; - } - } - } - - } /* for(... */ - - return(rtn); - -} /* malloc_chain_check(... */ |