thodg/libgit2/tests/buf/oom.c

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• Hash : 219512e7
  Author :
  Date : 2018-07-20T14:14:16
  

  buf tests: allocate a smaller size for the oom On Linux (where we run valgrind) allocate a smaller buffer, but still an insanely large size. This will cause malloc to fail but will not cause valgrind to report a likely error with a negative-sized malloc. Keep the original buffer size on non-Linux platforms: this is well-tested on them and changing it may be problematic. On macOS, for example, using the new size causes `malloc` to print a warning to stderr.

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• tests/buf/oom.c

• #include "clar_libgit2.h"
  #include "buffer.h"
  
  /*
   * We want to use some ridiculous size that `malloc` will fail with
   * but that does not otherwise interfere with testing.  On Linux, choose
   * a number that is large enough to fail immediately but small enough
   * that valgrind doesn't believe it to erroneously be a negative number.
   * On macOS, choose a number that is large enough to fail immediately
   * without having libc print warnings to stderr.
   */
  #if defined(GIT_ARCH_64) && defined(__linux__)
  # define TOOBIG 0x0fffffffffffffff
  #elif defined(__linux__)
  # define TOOBIG 0x0fffffff
  #elif defined(GIT_ARCH_64)
  # define TOOBIG 0xffffffffffffff00
  #else
  # define TOOBIG 0xffffff00
  #endif
  
  /**
   * If we make a ridiculously large request the first time we
   * actually allocate some space in the git_buf, the realloc()
   * will fail.  And because the git_buf_grow() wrapper always
   * sets mark_oom, the code in git_buf_try_grow() will free
   * the internal buffer and set it to git_buf__oom.
   * 
   * We initialized the internal buffer to (the static variable)
   * git_buf__initbuf.  The purpose of this test is to make sure
   * that we don't try to free the static buffer.
   */
  void test_buf_oom__grow(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_clear(&buf);
  
  	cl_assert(git_buf_grow(&buf, TOOBIG) == -1);
  	cl_assert(git_buf_oom(&buf));
  
  	git_buf_dispose(&buf);
  }
  
  void test_buf_oom__grow_by(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	buf.size = SIZE_MAX-10;
  
  	cl_assert(git_buf_grow_by(&buf, 50) == -1);
  	cl_assert(git_buf_oom(&buf));
  }
  

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