Bellow is a simple program wich test how malloc
allocates memory. On my systems glibc malloc starts with 128K RAM
[diet -Os ] gcc -Os -Wall -W malloctest.c
usage:
./a.out 1
./a.out 4046
./a.out 140000
strace ./a.out 22000 2>&1 | sed -e 1,/ZYX4132/d
strace ./a.out 200000 2>&1 | sed -e 1,/ZYX4132/d
In my next post I'll describe why I wrote this program!
It is designed to be as simple as possible...
Nikola
/* -- malloctest.c -- */
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
unsigned long u;
unsigned char c, *x, *a, *b, buf[3*sizeof(unsigned long)];
if (argc<2) { u=1; goto ready; }
x = (unsigned char *)argv[1];
for (u=0; (c=(*x - '0')) < 10; x++) u = u*10 + c;
ready:
write(2, "ZYX4132\n", 8);
a = sbrk(0);
x = malloc(u);
if (x) free(x);
b = sbrk(0);
u = b-a;
*--x = '\n';
do { *--x = '0'+u%10; u/=10; } while(u);
write(2, x, (buf + sizeof(buf)) -x);
return 0;
}
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