[llvm] r244707 - [libFuzzer] use raw C IO to reduce the risk of a deadlock in a signal handler.

[Kostya Serebryany via llvm-commits]

Author: kcc
Date: Tue Aug 11 19:55:09 2015
New Revision: 244707

URL: http://llvm.org/viewvc/llvm-project?rev=244707&view=rev
Log:
[libFuzzer] use raw C IO to reduce the risk of a deadlock in a signal handler.

Modified:
    llvm/trunk/lib/Fuzzer/FuzzerIO.cpp

Modified: llvm/trunk/lib/Fuzzer/FuzzerIO.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerIO.cpp?rev=244707&r1=244706&r2=244707&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerIO.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerIO.cpp Tue Aug 11 19:55:09 2015
@@ -66,8 +66,11 @@ void CopyFileToErr(const std::string &Pa
 }
 
 void WriteToFile(const Unit &U, const std::string &Path) {
-  std::ofstream OF(Path);
-  OF.write((const char*)U.data(), U.size());
+  // Use raw C interface because this function may be called from a sig handler.
+  FILE *Out = fopen(Path.c_str(), "w");
+  if (!Out) return;
+  fwrite(U.data(), sizeof(U[0]), U.size(), Out);
+  fclose(Out);
 }
 
 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,