FreeBSD C言語でメモリの確保(malloc)と開放(free)のトレースする方法

#include <stdio.h>
#include <stdlib.h>

int
main (int argc, char *argv[])
{
	int	*p, *q;

	p = malloc ( sizeof (int) );
	free (p);
	p = malloc ( sizeof (int) * 1024);
	printf ("%p\n", p);
	q = realloc ( p, sizeof (int) * 2048 * 1024);
	printf ("%p\n", q);
	free (q);

	exit (EXIT_SUCCESS);
}

cc malloc_test.c

%env MALLOC_OPTIONS='U' ktrace ./a.out
0x8102000
0x8200000

%kdump -tu -f ktrace.out
 58917 a.out    USER  malloc_init()
 58917 a.out    USER  0x8102094 = malloc(4)
 58917 a.out    USER  free(0x8102094)
 58917 a.out    USER  0x8102000 = malloc(4096)
 58917 a.out    USER  0x8103000 = malloc(4096)
 58917 a.out    USER  0x8200000 = realloc(0x8102000, 8388608)
 58917 a.out    USER  free(0x8200000)

• malloc/realloc については jman malloc を参照のこと。
• jman ktrace
• jman kdump