compiler-rt/test/tsan/mmap_lots.cpp

   1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2
   3 // Test that mmap does not return unexpected addresses
   4 // (the check is in the interceptor).
   5
   6 #include <fcntl.h>
   7 #include <stddef.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <sys/mman.h>
  11 #include <sys/stat.h>
  12 #include <sys/types.h>
  13 #include <unistd.h>
  14
  15 int main() {
  16   int fd = open("/dev/zero", O_RDWR);
  17   if (fd == -1) perror("open(/dev/zero)"), exit(1);
  18   for (size_t mmap_size = 64ull << 30; mmap_size >= 4 << 10; mmap_size /= 2) {
  19     size_t allocated = 0;
  20     while (mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
  21                 fd, 0) != MAP_FAILED) {
  22       allocated += mmap_size;
  23     }
  24     fprintf(stderr, "allocated %zu with size %zu\n", allocated, mmap_size);
  25   }
  26   fprintf(stderr, "DONE\n");
  27   // If tsan runtime will try to allocate something during exit handling,
  28   // the allocation will fail because there is no VA whatsoever.
  29   // It's observed to fail with the following error in some cases:
  30   // failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock.
  31   // So terminate the process immediately.
  32   _exit(0);
  33 }
  34
  35 // CHECK: DONE