llvm-project

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// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// UNSUPPORTED: ios
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#include <stdint.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/mman.h>
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#if defined(__FreeBSD__)
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// The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
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// that, it was never implemented.  So just define it to zero.
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#undef  MAP_NORESERVE
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#define MAP_NORESERVE 0
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#endif
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int main() {
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#ifdef __x86_64__
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  const size_t kLog2Size = 39;
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#elif defined(__mips64) || defined(__aarch64__) ||                             \
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    defined(__loongarch_lp64) || (defined(__riscv) && __riscv_xlen == 64)
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  const size_t kLog2Size = 32;
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#elif defined(__powerpc64__)
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  const size_t kLog2Size = 39;
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#elif defined(__s390x__)
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  const size_t kLog2Size = 43;
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#endif
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  const uintptr_t kLocation = 0x40ULL << kLog2Size;
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  void *p = mmap(
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      reinterpret_cast<void*>(kLocation),
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      1ULL << kLog2Size,
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      PROT_READ|PROT_WRITE,
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      MAP_PRIVATE|MAP_ANON|MAP_NORESERVE,
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      -1, 0);
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  fprintf(stderr, "DONE %p %d\n", p, errno);
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  return p == MAP_FAILED;
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}
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// CHECK: DONE
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