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测试支持

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下面的代码用于支持测试，默认情况下 perturb_byte 是0。

static int perturb_byte;

static void alloc_perturb(char *p, size_t n) {
    if (__glibc_unlikely(perturb_byte)) memset(p, perturb_byte ^ 0xff, n);
}

static void free_perturb(char *p, size_t n) {
    if (__glibc_unlikely(perturb_byte)) memset(p, perturb_byte, n);
}