3 #include <sys/syscall.h>
7 // kernel brk() and libc brk() act quite differently...
12 void* orig_ds = sbrk(0);
15 void* res __attribute__((unused));
16 #define EOL ((void*)( ~(long)0 ))
19 vals[2] = ds - 0x1; // small shrink
21 vals[4] = ds + 0x1000; // small growth
22 vals[5] = ds + 0x40000000; // too-big growth
23 vals[6] = ds + 0x500; // shrink a little, but still above start size
24 vals[7] = ds - 0x1; // shrink below start size
25 // vals[8] = ds - 0x1000; // shrink a lot below start size (into text)
29 for (i = 0; EOL != vals[i]; i++) {
30 res = (void*)syscall(__NR_brk, vals[i]);
33 assert( 0 == brk(orig_ds) ); // libc brk()
35 for (i = 0; EOL != vals[i]; i++) {
36 res = (void*)(long)brk(vals[i]);