diff --git a/libc/bionic/android_profiling_dynamic.cpp b/libc/bionic/android_profiling_dynamic.cpp
new file mode 100644
index 0000000..dd87ed8
--- /dev/null
+++ b/libc/bionic/android_profiling_dynamic.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_STATIC)
+#error This file should not be compiled for static targets.
+#endif
+
+#include <signal.h>
+
+#include <async_safe/log.h>
+#include <platform/bionic/malloc.h>
+#include <platform/bionic/reserved_signals.h>
+
+#include "malloc_heapprofd.h"
+
+// This file defines the handler for the reserved signal sent by the Android
+// platform's profilers. The accompanying signal value discriminates between
+// specific requestors:
+//  0: heapprofd heap profiler.
+static constexpr int kHeapprofdSignalValue = 0;
+
+static void HandleProfilingSignal(int, siginfo_t*, void*);
+
+// Called during dynamic libc preinit.
+__LIBC_HIDDEN__ void __libc_init_profiling_handlers() {
+  struct sigaction action = {};
+  action.sa_flags = SA_SIGINFO | SA_RESTART;
+  action.sa_sigaction = HandleProfilingSignal;
+  sigaction(BIONIC_SIGNAL_PROFILER, &action, nullptr);
+}
+
+static void HandleProfilingSignal(int /*signal_number*/, siginfo_t* info, void* /*ucontext*/) {
+  if (info->si_code != SI_QUEUE)
+    return;
+
+  int signal_value = info->si_value.sival_int;
+  async_safe_format_log(ANDROID_LOG_WARN, "libc", "%s: received profiling signal with si_value: %d",
+                        getprogname(), signal_value);
+
+  // Proceed only if the process is considered profileable.
+  bool profileable = false;
+  android_mallopt(M_GET_PROCESS_PROFILEABLE, &profileable, sizeof(profileable));
+  if (!profileable) {
+    async_safe_write_log(ANDROID_LOG_ERROR, "libc", "profiling signal rejected (not profileable)");
+    return;
+  }
+
+  if (signal_value == kHeapprofdSignalValue) {
+    HandleHeapprofdSignal();
+  } else {
+    async_safe_format_log(ANDROID_LOG_ERROR, "libc", "unrecognized profiling signal si_value: %d",
+                          signal_value);
+  }
+}