Rebased PNaCl localmods in LLVM to 223109

lib/Support/Unix/Process.inc

 //===- Unix/Process.cpp - Unix Process Implementation --------- -*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file provides the generic Unix implementation of the Process class.
@@ skipping 247 matching lines @@
 
     if (NullFD == StandardFD)
       FDC.keepOpen();
     else if (dup2(NullFD, StandardFD) < 0)
       return std::error_code(errno, std::generic_category());
   }
   return std::error_code();
 }
 
 std::error_code Process::SafelyCloseFileDescriptor(int FD) {
+  // @LOCALMOD-BEGIN: For NaCl, don't use pthread_sigmask, etc.
+  // They are stubs and fail with ENOSYS, which make this return
+  // an error.
+#ifdef __native_client__
+  int ErrnoFromClose = 0;
+  if (::close(FD) < 0)
+    ErrnoFromClose = errno;
+  return std::error_code(ErrnoFromClose, std::generic_category());
+#else
+
   // Create a signal set filled with *all* signals.
   sigset_t FullSet;
   if (sigfillset(&FullSet) < 0)
     return std::error_code(errno, std::generic_category());
   // Atomically swap our current signal mask with a full mask.
   sigset_t SavedSet;
 #if LLVM_ENABLE_THREADS
   if (int EC = pthread_sigmask(SIG_SETMASK, &FullSet, &SavedSet))
     return std::error_code(EC, std::generic_category());
 #else
@@ skipping 12 matching lines @@
   EC = pthread_sigmask(SIG_SETMASK, &SavedSet, nullptr);
 #else
   if (sigprocmask(SIG_SETMASK, &SavedSet, nullptr) < 0)
     EC = errno;
 #endif
   // The error code from close takes precedence over the one from
   // pthread_sigmask.
   if (ErrnoFromClose)
     return std::error_code(ErrnoFromClose, std::generic_category());
   return std::error_code(EC, std::generic_category());
+#endif  // @LOCALMOD-END
 }
 
 bool Process::StandardInIsUserInput() {
   return FileDescriptorIsDisplayed(STDIN_FILENO);
 }
 
 bool Process::StandardOutIsDisplayed() {
   return FileDescriptorIsDisplayed(STDOUT_FILENO);
 }
 
@@ skipping 159 matching lines @@
 
 unsigned llvm::sys::Process::GetRandomNumber() {
 #if defined(HAVE_DECL_ARC4RANDOM) && HAVE_DECL_ARC4RANDOM
   return arc4random();
 #else
   static int x = (::srand(GetRandomNumberSeed()), 0);
   (void)x;
   return ::rand();
 #endif
 }