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/* Set various malloc options */
/* Author: Mark Moraes <moraes@csri.toronto.edu> */
/*LINTLIBRARY*/
#include "defs.h"
#include "globals.h"
RCSID("$Id: setopts.c,v 1.1.1.1 1998/02/10 21:01:46 mea Exp $")
/*
* Sets debugging level - level 0 and 1 both perform normal checking -
* making sure a pointer is valid before it is used for any heap data,
* and doing consistency checking on any block it touches while it
* works. Level 2 asks for a mal_verify() on every malloc(), free() or
* realloc(), thus checking the entire heap's pointers for consistency.
* Level 3 makes mal_verify() check that all free blocks contain a
* magic pattern that is put into a free block when it is freed.
*/
void
mal_debug(level)
int level;
{
#ifdef DEBUG
if (level < 0 || level > 3) {
return;
}
_malloc_debugging = level;
#endif /* DEBUG */
}
/*
* Allows you to control the number of system calls made, which might
* be helpful in a program allocating a lot of memory - call this once
* to set a number big enough to contain all the allocations. Or for
* very little allocation, so that you don't get a huge space just
* because you alloc'e a couple of strings
*/
void
mal_sbrkset(n)
int n;
{
if (n < _malloc_minchunk * sizeof(Word)) {
/* sbrk'ing anything less than a Word isn't a great idea.*/
return;
}
_malloc_sbrkunits = (n + sizeof(Word) - 1) / sizeof(Word);
return;
}
/*
* Since the minimum size block allocated is sizeof(Word)*_malloc_minchunk,
* adjusting _malloc_minchunk is one way to control
* memory fragmentation, and if you do a lot of mallocs and frees of
* objects that have a similar size, then a good way to speed things up
* is to set _malloc_minchunk such that the minimum size block covers
* most of the objects you allocate
*/
void
mal_slopset(n)
int n;
{
if (n < 0) {
return;
}
_malloc_minchunk = (n + sizeof(Word) - 1) / sizeof(Word) + FIXEDOVERHEAD;
return;
}
/*
* Sets the file used for verbose statistics to 'fp'. Does no
* verification whatsoever on the file descriptor
*/
void
mal_setstatsfile(fp)
FILE *fp;
{
_malloc_statsfile = fp;
/*
* This file descriptor had better not have been written to before
* this
*/
(void) setvbuf(fp, (char *) 0, _IONBF, 0);
}
/*
* Turns tracing on (if value != 0) or off, (if value == 0)
*/
void
mal_trace(value)
int value;
{
if (value) {
/* Try to unbuffer the trace file */
(void) setvbuf(_malloc_statsfile, (char *) 0, _IONBF, 0);
/*
* Write something to the stats file so stdio can initialize
* its buffers i.e. call malloc() at least once while tracing
* is off, if the unbuffering failed.
*/
(void) fputs("Malloc tracing starting\n", _malloc_statsfile);
_malloc_tracing = 1;
if (_malloc_loword != NULL) {
/*
* malloc happened before tracing turned on, so make
* sure we print the heap start for xmem analysis.
*/
PRTRACE(sprintf(_malloc_statsbuf, "heapstart 0x%lx\n",
(ulong) _malloc_loword));
}
} else {
/* For symmetry */
(void) fputs("Malloc tracing stopped\n", _malloc_statsfile);
_malloc_tracing = 0;
}
(void) fflush(_malloc_statsfile);
}
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