1 files changed, 157 insertions, 0 deletions
diff --git a/mozglue/build/BionicGlue.cpp b/mozglue/build/BionicGlue.cpp
new file mode 100644
index 0000000000..208fcce68c
--- /dev/null
+++ b/mozglue/build/BionicGlue.cpp
@@ -0,0 +1,157 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <pthread.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <android/log.h>
+#include <sys/syscall.h>
+
+#include "mozilla/Alignment.h"
+
+#include <vector>
+
+#define NS_EXPORT __attribute__ ((visibility("default")))
+
+#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
+/* Android doesn't have pthread_atfork(), so we need to use our own. */
+struct AtForkFuncs {
+  void (*prepare)(void);
+  void (*parent)(void);
+  void (*child)(void);
+};
+
+/* jemalloc's initialization calls pthread_atfork. When pthread_atfork (see
+ * further below) stores the corresponding data, it's going to allocate memory,
+ * which will loop back to jemalloc's initialization, leading to a dead-lock.
+ * So, for that specific vector, we use a special allocator that returns a
+ * static buffer for small sizes, and force the initial vector capacity to
+ * a size enough to store one atfork function table. */
+template <typename T>
+struct SpecialAllocator: public std::allocator<T>
+{
+  SpecialAllocator(): bufUsed(false) {}
+
+  inline typename std::allocator<T>::pointer allocate(typename std::allocator<T>::size_type n, const void * = 0) {
+    if (!bufUsed && n == 1) {
+      bufUsed = true;
+      return buf.addr();
+    }
+    return reinterpret_cast<T *>(::operator new(sizeof(T) * n));
+  }
+
+  inline void deallocate(typename std::allocator<T>::pointer p, typename std::allocator<T>::size_type n) {
+    if (p == buf.addr())
+      bufUsed = false;
+    else
+      ::operator delete(p);
+  }
+
+  template<typename U>
+  struct rebind {
+    typedef SpecialAllocator<U> other;
+  };
+
+private:
+  mozilla::AlignedStorage2<T> buf;
+  bool bufUsed;
+};
+
+static std::vector<AtForkFuncs, SpecialAllocator<AtForkFuncs> > atfork;
+#endif
+
+#ifdef MOZ_WIDGET_GONK
+#include "cpuacct.h"
+
+#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
+extern "C" NS_EXPORT int
+timer_create(clockid_t, struct sigevent*, timer_t*)
+{
+  __android_log_print(ANDROID_LOG_ERROR, "BionicGlue", "timer_create not supported!");
+  abort();
+  return -1;
+}
+#endif
+
+#else
+#define cpuacct_add(x)
+#endif
+
+#if ANDROID_VERSION < 17 || defined(MOZ_WIDGET_ANDROID)
+extern "C" NS_EXPORT int
+pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
+{
+  AtForkFuncs funcs;
+  funcs.prepare = prepare;
+  funcs.parent = parent;
+  funcs.child = child;
+  if (!atfork.capacity())
+    atfork.reserve(1);
+  atfork.push_back(funcs);
+  return 0;
+}
+
+extern "C" NS_EXPORT pid_t __fork(void);
+
+extern "C" NS_EXPORT pid_t
+fork(void)
+{
+  pid_t pid;
+  for (auto it = atfork.rbegin();
+       it < atfork.rend(); ++it)
+    if (it->prepare)
+      it->prepare();
+
+  switch ((pid = syscall(__NR_clone, SIGCHLD, NULL, NULL, NULL, NULL))) {
+  case 0:
+    cpuacct_add(getuid());
+    for (auto it = atfork.begin();
+         it < atfork.end(); ++it)
+      if (it->child)
+        it->child();
+    break;
+  default:
+    for (auto it = atfork.begin();
+         it < atfork.end(); ++it)
+      if (it->parent)
+        it->parent();
+  }
+  return pid;
+}
+#endif
+
+extern "C" NS_EXPORT int
+raise(int sig)
+{
+  // Bug 741272: Bionic incorrectly uses kill(), which signals the
+  // process, and thus could signal another thread (and let this one
+  // return "successfully" from raising a fatal signal).
+  //
+  // Bug 943170: POSIX specifies pthread_kill(pthread_self(), sig) as
+  // equivalent to raise(sig), but Bionic also has a bug with these
+  // functions, where a forked child will kill its parent instead.
+
+  extern pid_t gettid(void);
+  return syscall(__NR_tgkill, getpid(), gettid(), sig);
+}
+
+/* Flash plugin uses symbols that are not present in Android >= 4.4 */
+#ifndef MOZ_WIDGET_GONK
+namespace android {
+  namespace VectorImpl {
+    NS_EXPORT void reservedVectorImpl1(void) { }
+    NS_EXPORT void reservedVectorImpl2(void) { }
+    NS_EXPORT void reservedVectorImpl3(void) { }
+    NS_EXPORT void reservedVectorImpl4(void) { }
+    NS_EXPORT void reservedVectorImpl5(void) { }
+    NS_EXPORT void reservedVectorImpl6(void) { }
+    NS_EXPORT void reservedVectorImpl7(void) { }
+    NS_EXPORT void reservedVectorImpl8(void) { }
+  }
+}
+#endif
+