Merge changes from topic 'debuggerd_client'

* changes:
  adb: use libdebuggerd_client.
  debuggerd: add libdebuggerd_client.

adb/Android.mk

@@ -319,6 +319,7 @@ LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)
 LOCAL_C_INCLUDES += system/extras/ext4_utils
 
 LOCAL_SANITIZE := $(adb_target_sanitize)
+LOCAL_STRIP_MODULE := keep_symbols
 LOCAL_STATIC_LIBRARIES := \
     libadbd \
     libbase \
@@ -333,6 +334,7 @@ LOCAL_STATIC_LIBRARIES := \
     libbase \
     libcrypto_utils_static \
     libcrypto_static \
-    libminijail
+    libminijail \
+    libdebuggerd_client \
 
 include $(BUILD_EXECUTABLE)

adb/daemon/main.cpp

@@ -32,6 +32,7 @@
 #include <libminijail.h>
 
 #include "cutils/properties.h"
+#include "debuggerd/client.h"
 #include "private/android_filesystem_config.h"
 #include "selinux/android.h"
 
@@ -247,6 +248,7 @@ int main(int argc, char** argv) {
 
     close_stdin();
 
+    debuggerd_init(nullptr);
     adb_trace_init(argv);
 
     D("Handling main()");

debuggerd/Android.bp

@@ -0,0 +1,19 @@
+cc_library_static {
+  name: "libdebuggerd_client",
+  srcs: ["client/debuggerd_client.cpp"],
+
+  cflags: [
+    "-Wall",
+    "-Wextra",
+    "-Werror",
+    "-Os",
+  ],
+
+  local_include_dirs: ["include"],
+  export_include_dirs: ["include"],
+
+  // libdebuggerd_client gets async signal safe logging via libc_logging,
+  // which defines its interface in bionic private headers.
+  include_dirs: ["bionic/libc"],
+  static_libs: ["libc_logging"],
+}

debuggerd/Android.soong.mk

@@ -8,6 +8,10 @@ common_cppflags := \
     -Wunused \
     -Werror \
 
+ifeq ($(TARGET_IS_64_BIT),true)
+common_cppflags += -DTARGET_IS_64_BIT
+endif
+
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
@@ -26,15 +30,12 @@ LOCAL_SRC_FILES_mips64 := mips64/machine.cpp
 LOCAL_SRC_FILES_x86    := x86/machine.cpp
 LOCAL_SRC_FILES_x86_64 := x86_64/machine.cpp
 
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_CPPFLAGS := $(common_cppflags)
 
 LOCAL_INIT_RC_32 := debuggerd.rc
 LOCAL_INIT_RC_64 := debuggerd64.rc
 
-ifeq ($(TARGET_IS_64_BIT),true)
-LOCAL_CPPFLAGS += -DTARGET_IS_64_BIT
-endif
-
 LOCAL_SHARED_LIBRARIES := \
     libbacktrace \
     libbase \
@@ -51,7 +52,7 @@ LOCAL_MULTILIB := both
 
 include $(BUILD_EXECUTABLE)
 
-
+crasher_cppflags := $(common_cppflags) -fstack-protector-all -Wno-free-nonheap-object -Wno-date-time
 
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES := crasher.cpp
@@ -63,8 +64,7 @@ LOCAL_SRC_FILES_x86    := x86/crashglue.S
 LOCAL_SRC_FILES_x86_64 := x86_64/crashglue.S
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
 LOCAL_MODULE_TAGS := optional
-LOCAL_CPPFLAGS := $(common_cppflags) -fstack-protector-all -Wno-free-nonheap-object -Wno-date-time
-#LOCAL_FORCE_STATIC_EXECUTABLE := true
+LOCAL_CPPFLAGS := $(crasher_cppflags)
 LOCAL_SHARED_LIBRARIES := libcutils liblog
 
 # The arm emulator has VFP but not VFPv3-D32.
@@ -79,6 +79,34 @@ LOCAL_MULTILIB := both
 
 include $(BUILD_EXECUTABLE)
 
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := crasher.cpp
+LOCAL_SRC_FILES_arm    := arm/crashglue.S
+LOCAL_SRC_FILES_arm64  := arm64/crashglue.S
+LOCAL_SRC_FILES_mips   := mips/crashglue.S
+LOCAL_SRC_FILES_mips64 := mips64/crashglue.S
+LOCAL_SRC_FILES_x86    := x86/crashglue.S
+LOCAL_SRC_FILES_x86_64 := x86_64/crashglue.S
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
+LOCAL_MODULE_TAGS := optional
+LOCAL_CPPFLAGS := $(crasher_cppflags) -DSTATIC_CRASHER
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+LOCAL_SHARED_LIBRARIES := libcutils liblog
+
+# The arm emulator has VFP but not VFPv3-D32.
+ifeq ($(ARCH_ARM_HAVE_VFP_D32),true)
+LOCAL_ASFLAGS_arm += -DHAS_VFP_D32
+endif
+
+LOCAL_MODULE := static_crasher
+LOCAL_MODULE_STEM_32 := static_crasher
+LOCAL_MODULE_STEM_64 := static_crasher64
+LOCAL_MULTILIB := both
+
+LOCAL_STATIC_LIBRARIES := libdebuggerd_client libcutils liblog
+
+include $(BUILD_EXECUTABLE)
+
 debuggerd_test_src_files := \
     utility.cpp \
     test/dump_memory_test.cpp \

debuggerd/client/debuggerd_client.cpp

@@ -0,0 +1,311 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+#include "debuggerd/client.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/syscall.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include "private/libc_logging.h"
+
+#if defined(TARGET_IS_64_BIT) && !defined(__LP64__)
+#define SOCKET_NAME "android:debuggerd32"
+#else
+#define SOCKET_NAME "android:debuggerd"
+#endif
+
+// see man(2) prctl, specifically the section about PR_GET_NAME
+#define MAX_TASK_NAME_LEN (16)
+
+static debuggerd_callbacks_t g_callbacks;
+
+static int socket_abstract_client(const char* name, int type) {
+  sockaddr_un addr;
+
+  // Test with length +1 for the *initial* '\0'.
+  size_t namelen = strlen(name);
+  if ((namelen + 1) > sizeof(addr.sun_path)) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  // This is used for abstract socket namespace, we need
+  // an initial '\0' at the start of the Unix socket path.
+  //
+  // Note: The path in this case is *not* supposed to be
+  // '\0'-terminated. ("man 7 unix" for the gory details.)
+  memset(&addr, 0, sizeof(addr));
+  addr.sun_family = AF_LOCAL;
+  addr.sun_path[0] = 0;
+  memcpy(addr.sun_path + 1, name, namelen);
+
+  socklen_t alen = namelen + offsetof(sockaddr_un, sun_path) + 1;
+
+  int s = socket(AF_LOCAL, type, 0);
+  if (s == -1) {
+    return -1;
+  }
+
+  int rc = TEMP_FAILURE_RETRY(connect(s, reinterpret_cast<sockaddr*>(&addr), alen));
+  if (rc == -1) {
+    close(s);
+    return -1;
+  }
+
+  return s;
+}
+
+/*
+ * Writes a summary of the signal to the log file.  We do this so that, if
+ * for some reason we're not able to contact debuggerd, there is still some
+ * indication of the failure in the log.
+ *
+ * We could be here as a result of native heap corruption, or while a
+ * mutex is being held, so we don't want to use any libc functions that
+ * could allocate memory or hold a lock.
+ */
+static void log_signal_summary(int signum, const siginfo_t* info) {
+  const char* signal_name = "???";
+  bool has_address = false;
+  switch (signum) {
+    case SIGABRT:
+      signal_name = "SIGABRT";
+      break;
+    case SIGBUS:
+      signal_name = "SIGBUS";
+      has_address = true;
+      break;
+    case SIGFPE:
+      signal_name = "SIGFPE";
+      has_address = true;
+      break;
+    case SIGILL:
+      signal_name = "SIGILL";
+      has_address = true;
+      break;
+    case SIGSEGV:
+      signal_name = "SIGSEGV";
+      has_address = true;
+      break;
+#if defined(SIGSTKFLT)
+    case SIGSTKFLT:
+      signal_name = "SIGSTKFLT";
+      break;
+#endif
+    case SIGTRAP:
+      signal_name = "SIGTRAP";
+      break;
+  }
+
+  char thread_name[MAX_TASK_NAME_LEN + 1];  // one more for termination
+  if (prctl(PR_GET_NAME, reinterpret_cast<unsigned long>(thread_name), 0, 0, 0) != 0) {
+    strcpy(thread_name, "<name unknown>");
+  } else {
+    // short names are null terminated by prctl, but the man page
+    // implies that 16 byte names are not.
+    thread_name[MAX_TASK_NAME_LEN] = 0;
+  }
+
+  // "info" will be null if the siginfo_t information was not available.
+  // Many signals don't have an address or a code.
+  char code_desc[32];  // ", code -6"
+  char addr_desc[32];  // ", fault addr 0x1234"
+  addr_desc[0] = code_desc[0] = 0;
+  if (info != nullptr) {
+    // For a rethrown signal, this si_code will be right and the one debuggerd shows will
+    // always be SI_TKILL.
+    __libc_format_buffer(code_desc, sizeof(code_desc), ", code %d", info->si_code);
+    if (has_address) {
+      __libc_format_buffer(addr_desc, sizeof(addr_desc), ", fault addr %p", info->si_addr);
+    }
+  }
+  __libc_format_log(ANDROID_LOG_FATAL, "libc", "Fatal signal %d (%s)%s%s in tid %d (%s)", signum,
+                    signal_name, code_desc, addr_desc, gettid(), thread_name);
+}
+
+/*
+ * Returns true if the handler for signal "signum" has SA_SIGINFO set.
+ */
+static bool have_siginfo(int signum) {
+  struct sigaction old_action, new_action;
+
+  memset(&new_action, 0, sizeof(new_action));
+  new_action.sa_handler = SIG_DFL;
+  new_action.sa_flags = SA_RESTART;
+  sigemptyset(&new_action.sa_mask);
+
+  if (sigaction(signum, &new_action, &old_action) < 0) {
+    __libc_format_log(ANDROID_LOG_WARN, "libc", "Failed testing for SA_SIGINFO: %s",
+                      strerror(errno));
+    return false;
+  }
+  bool result = (old_action.sa_flags & SA_SIGINFO) != 0;
+
+  if (sigaction(signum, &old_action, nullptr) == -1) {
+    __libc_format_log(ANDROID_LOG_WARN, "libc", "Restore failed in test for SA_SIGINFO: %s",
+                      strerror(errno));
+  }
+  return result;
+}
+
+static void send_debuggerd_packet(siginfo_t* info) {
+  // Mutex to prevent multiple crashing threads from trying to talk
+  // to debuggerd at the same time.
+  static pthread_mutex_t crash_mutex = PTHREAD_MUTEX_INITIALIZER;
+  int ret = pthread_mutex_trylock(&crash_mutex);
+  if (ret != 0) {
+    if (ret == EBUSY) {
+      __libc_format_log(ANDROID_LOG_INFO, "libc",
+                        "Another thread contacted debuggerd first; not contacting debuggerd.");
+      // This will never complete since the lock is never released.
+      pthread_mutex_lock(&crash_mutex);
+    } else {
+      __libc_format_log(ANDROID_LOG_INFO, "libc", "pthread_mutex_trylock failed: %s", strerror(ret));
+    }
+    return;
+  }
+
+  int s = socket_abstract_client(SOCKET_NAME, SOCK_STREAM | SOCK_CLOEXEC);
+  if (s == -1) {
+    __libc_format_log(ANDROID_LOG_FATAL, "libc", "Unable to open connection to debuggerd: %s",
+                      strerror(errno));
+    return;
+  }
+
+  // debuggerd knows our pid from the credentials on the
+  // local socket but we need to tell it the tid of the crashing thread.
+  // debuggerd will be paranoid and verify that we sent a tid
+  // that's actually in our process.
+  debugger_msg_t msg;
+  msg.action = DEBUGGER_ACTION_CRASH;
+  msg.tid = gettid();
+  msg.abort_msg_address = 0;
+
+  if (g_callbacks.get_abort_message) {
+    msg.abort_msg_address = reinterpret_cast<uintptr_t>(g_callbacks.get_abort_message());
+  }
+
+  msg.original_si_code = (info != nullptr) ? info->si_code : 0;
+  ret = TEMP_FAILURE_RETRY(write(s, &msg, sizeof(msg)));
+  if (ret == sizeof(msg)) {
+    char debuggerd_ack;
+    ret = TEMP_FAILURE_RETRY(read(s, &debuggerd_ack, 1));
+    int saved_errno = errno;
+    if (g_callbacks.post_dump) {
+      g_callbacks.post_dump();
+    }
+    errno = saved_errno;
+  } else {
+    // read or write failed -- broken connection?
+    __libc_format_log(ANDROID_LOG_FATAL, "libc", "Failed while talking to debuggerd: %s",
+                      strerror(errno));
+  }
+
+  close(s);
+}
+
+/*
+ * Catches fatal signals so we can ask debuggerd to ptrace us before
+ * we crash.
+ */
+static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void*) {
+  // It's possible somebody cleared the SA_SIGINFO flag, which would mean
+  // our "info" arg holds an undefined value.
+  if (!have_siginfo(signal_number)) {
+    info = nullptr;
+  }
+
+  log_signal_summary(signal_number, info);
+
+  send_debuggerd_packet(info);
+
+  // We need to return from the signal handler so that debuggerd can dump the
+  // thread that crashed, but returning here does not guarantee that the signal
+  // will be thrown again, even for SIGSEGV and friends, since the signal could
+  // have been sent manually. Resend the signal with rt_tgsigqueueinfo(2) to
+  // preserve the SA_SIGINFO contents.
+  signal(signal_number, SIG_DFL);
+
+  struct siginfo si;
+  if (!info) {
+    memset(&si, 0, sizeof(si));
+    si.si_code = SI_USER;
+    si.si_pid = getpid();
+    si.si_uid = getuid();
+    info = &si;
+  } else if (info->si_code >= 0 || info->si_code == SI_TKILL) {
+    // rt_tgsigqueueinfo(2)'s documentation appears to be incorrect on kernels
+    // that contain commit 66dd34a (3.9+). The manpage claims to only allow
+    // negative si_code values that are not SI_TKILL, but 66dd34a changed the
+    // check to allow all si_code values in calls coming from inside the house.
+  }
+
+  int rc = syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), signal_number, info);
+  if (rc != 0) {
+    __libc_format_log(ANDROID_LOG_FATAL, "libc", "failed to resend signal during crash: %s",
+                      strerror(errno));
+    _exit(0);
+  }
+}
+
+void debuggerd_init(debuggerd_callbacks_t* callbacks) {
+  if (callbacks) {
+    g_callbacks = *callbacks;
+  }
+
+  struct sigaction action;
+  memset(&action, 0, sizeof(action));
+  sigemptyset(&action.sa_mask);
+  action.sa_sigaction = debuggerd_signal_handler;
+  action.sa_flags = SA_RESTART | SA_SIGINFO;
+
+  // Use the alternate signal stack if available so we can catch stack overflows.
+  action.sa_flags |= SA_ONSTACK;
+
+  sigaction(SIGABRT, &action, nullptr);
+  sigaction(SIGBUS, &action, nullptr);
+  sigaction(SIGFPE, &action, nullptr);
+  sigaction(SIGILL, &action, nullptr);
+  sigaction(SIGSEGV, &action, nullptr);
+#if defined(SIGSTKFLT)
+  sigaction(SIGSTKFLT, &action, nullptr);
+#endif
+  sigaction(SIGTRAP, &action, nullptr);
+}

debuggerd/crasher.cpp

@@ -16,6 +16,10 @@
 #include <cutils/sockets.h>
 #include <log/log.h>
 
+#if defined(STATIC_CRASHER)
+#include "debuggerd/client.h"
+#endif
+
 #ifndef __unused
 #define __unused __attribute__((__unused__))
 #endif
@@ -43,7 +47,7 @@ __attribute__ ((noinline)) static void smash_stack_dummy_function(volatile int*
 // Assign local array address to global variable to force stack guards.
 // Use another noinline function to corrupt the stack.
 __attribute__ ((noinline)) static int smash_stack(volatile int* plen) {
-    printf("crasher: deliberately corrupting stack...\n");
+    printf("%s: deliberately corrupting stack...\n", __progname);
 
     char buf[128];
     smash_stack_dummy_buf = buf;
@@ -135,7 +139,7 @@ static void sigsegv_non_null() {
 
 static int do_action(const char* arg)
 {
-    fprintf(stderr,"crasher: init pid=%d tid=%d\n", getpid(), gettid());
+    fprintf(stderr, "%s: init pid=%d tid=%d\n", __progname, getpid(), gettid());
 
     if (!strncmp(arg, "thread-", strlen("thread-"))) {
         return do_action_on_thread(arg + strlen("thread-"));
@@ -209,9 +213,26 @@ static int do_action(const char* arg)
 
 int main(int argc, char **argv)
 {
-    fprintf(stderr,"crasher: built at " __TIME__ "!@\n");
+    fprintf(stderr, "%s: built at " __TIME__ "!@\n", __progname);
 
-    if(argc > 1) {
+#if defined(STATIC_CRASHER)
+    debuggerd_callbacks_t callbacks = {
+      .get_abort_message = []() {
+        static struct {
+          size_t size;
+          char msg[32];
+        } msg;
+
+        msg.size = strlen("dummy abort message");
+        memcpy(msg.msg, "dummy abort message", strlen("dummy abort message"));
+        return reinterpret_cast<abort_msg_t*>(&msg);
+      },
+      .post_dump = nullptr
+    };
+    debuggerd_init(&callbacks);
+#endif
+
+    if (argc > 1) {
         return do_action(argv[1]);
     } else {
         crash1();

debuggerd/debuggerd.cpp

@@ -562,7 +562,7 @@ static void worker_process(int fd, debugger_request_t& request) {
   // won't necessarily have stopped by the time ptrace() returns.  (We
   // currently assume it does.)  We write to the file descriptor to
   // ensure that it can run as soon as we call PTRACE_CONT below.
-  // See details in bionic/libc/linker/debugger.c, in function
+  // See details in client/debuggerd_client.cpp, in function
   // debugger_signal_handler().
 
   // Attach to the target process.

debuggerd/include/debuggerd/client.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+// On 32-bit devices, DEBUGGER_SOCKET_NAME is a 32-bit debuggerd.
+// On 64-bit devices, DEBUGGER_SOCKET_NAME is a 64-bit debuggerd.
+#define DEBUGGER_SOCKET_NAME "android:debuggerd"
+
+// Used only on 64-bit devices for debuggerd32.
+#define DEBUGGER32_SOCKET_NAME "android:debuggerd32"
+
+__BEGIN_DECLS
+
+typedef enum {
+  // dump a crash
+  DEBUGGER_ACTION_CRASH,
+  // dump a tombstone file
+  DEBUGGER_ACTION_DUMP_TOMBSTONE,
+  // dump a backtrace only back to the socket
+  DEBUGGER_ACTION_DUMP_BACKTRACE,
+} debugger_action_t;
+
+// Make sure that all values have a fixed size so that this structure
+// is the same for 32 bit and 64 bit processes.
+typedef struct __attribute__((packed)) {
+  int32_t action;
+  pid_t tid;
+  uint64_t abort_msg_address;
+  int32_t original_si_code;
+} debugger_msg_t;
+
+// These callbacks are called in a signal handler, and thus must be async signal safe.
+// If null, the callbacks will not be called.
+typedef struct {
+  struct abort_msg_t* (*get_abort_message)();
+  void (*post_dump)();
+} debuggerd_callbacks_t;
+
+void debuggerd_init(debuggerd_callbacks_t* callbacks);
+
+__END_DECLS

include/cutils/debugger.h

@@ -20,32 +20,10 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
+#include "debuggerd/client.h"
+
 __BEGIN_DECLS
 
-#define DEBUGGER_SOCKET_NAME "android:debuggerd"
-#define DEBUGGER32_SOCKET_NAME "android:debuggerd32"
-#define DEBUGGER64_SOCKET_NAME DEBUGGER_SOCKET_NAME
-
-typedef enum {
-    // dump a crash
-    DEBUGGER_ACTION_CRASH,
-    // dump a tombstone file
-    DEBUGGER_ACTION_DUMP_TOMBSTONE,
-    // dump a backtrace only back to the socket
-    DEBUGGER_ACTION_DUMP_BACKTRACE,
-} debugger_action_t;
-
-// Make sure that all values have a fixed size so that this structure
-// is the same for 32 bit and 64 bit processes.
-// NOTE: Any changes to this structure must also be reflected in
-//       bionic/linker/debugger.cpp.
-typedef struct __attribute__((packed)) {
-    int32_t action;
-    pid_t tid;
-    uint64_t abort_msg_address;
-    int32_t original_si_code;
-} debugger_msg_t;
-
 /* Dumps a process backtrace, registers, and stack to a tombstone file (requires root).
  * Stores the tombstone path in the provided buffer.
  * Returns 0 on success, -1 on error.

libcutils/Android.mk

@@ -117,7 +117,8 @@ LOCAL_SRC_FILES_x86_64 += \
         arch-x86_64/android_memset32.S \
 
 LOCAL_C_INCLUDES := $(libcutils_c_includes)
-LOCAL_STATIC_LIBRARIES := liblog
+LOCAL_EXPORT_STATIC_LIBRARY_HEADERS := libdebuggerd_client
+LOCAL_STATIC_LIBRARIES := liblog libdebuggerd_client
 ifneq ($(ENABLE_CPUSETS),)
 LOCAL_CFLAGS += -DUSE_CPUSETS
 endif
@@ -134,6 +135,8 @@ LOCAL_MODULE := libcutils
 # TODO: remove liblog as whole static library, once we don't have prebuilt that requires
 # liblog symbols present in libcutils.
 LOCAL_WHOLE_STATIC_LIBRARIES := libcutils liblog
+LOCAL_EXPORT_STATIC_LIBRARY_HEADERS := libdebuggerd_client
+LOCAL_STATIC_LIBRARIES := libdebuggerd_client
 LOCAL_SHARED_LIBRARIES := liblog
 ifneq ($(ENABLE_CPUSETS),)
 LOCAL_CFLAGS += -DUSE_CPUSETS