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测试支持

The following code is used to support testing. Perturb_byte is 0 by default.

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);

}

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