| 1 | // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t && %run %t |
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| 2 | |
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| 3 | #include <assert.h> |
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| 4 | #include <unistd.h> |
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| 5 | #include <sys/mman.h> |
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| 6 | |
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| 7 | int main(void) { |
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| 8 | unsigned char vec[20]; |
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| 9 | int res; |
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| 10 | size_t PS = sysconf(_SC_PAGESIZE); |
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| 11 | void *addr = mmap(addr: nullptr, len: 20 * PS, PROT_READ | PROT_WRITE, |
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| 12 | MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS, fd: 0, offset: 0); |
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| 13 | |
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| 14 | res = mincore(start: addr, len: 10 * PS, vec: vec); |
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| 15 | assert(res == 0); |
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| 16 | for (int i = 0; i < 10; ++i) |
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| 17 | assert((vec[i] & 1) == 0); |
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| 18 | |
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| 19 | for (int i = 0; i < 5; ++i) |
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| 20 | ((char *)addr)[i * PS] = 1; |
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| 21 | res = mincore(start: addr, len: 10 * PS, vec: vec); |
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| 22 | assert(res == 0); |
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| 23 | for (int i = 0; i < 10; ++i) |
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| 24 | assert((vec[i] & 1) == (i < 5)); |
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| 25 | |
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| 26 | for (int i = 5; i < 10; ++i) |
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| 27 | ((char *)addr)[i * PS] = 1; |
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| 28 | res = mincore(start: addr, len: 10 * PS, vec: vec); |
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| 29 | assert(res == 0); |
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| 30 | for (int i = 0; i < 10; ++i) |
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| 31 | assert((vec[i] & 1) == 1); |
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| 32 | |
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| 33 | return 0; |
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| 34 | } |
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| 35 | |
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