forked from OSchip/llvm-project
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// Test that mmap does not return unexpected addresses
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// (the check is in the interceptor).
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main() {
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int fd = open("/dev/zero", O_RDWR);
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if (fd == -1) perror("open(/dev/zero)"), exit(1);
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for (size_t mmap_size = 64ull << 30; mmap_size >= 4 << 10; mmap_size /= 2) {
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size_t allocated = 0;
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while (mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
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fd, 0) != MAP_FAILED) {
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allocated += mmap_size;
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}
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fprintf(stderr, "allocated %zu with size %zu\n", allocated, mmap_size);
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}
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fprintf(stderr, "DONE\n");
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// If tsan runtime will try to allocate something during exit handling,
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// the allocation will fail because there is no VA whatsoever.
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// It's observed to fail with the following error in some cases:
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// failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock.
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// So terminate the process immediately.
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_exit(0);
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}
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// CHECK: DONE
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