Linux: Add Breakpad client.

chrome/renderer/render_crash_handler_linux.cc

Index: chrome/renderer/render_crash_handler_linux.cc
diff --git a/chrome/renderer/render_crash_handler_linux.cc b/chrome/renderer/render_crash_handler_linux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0594f17e0739bdbb7ef20189cebbe28efd8895ac
--- /dev/null
+++ b/chrome/renderer/render_crash_handler_linux.cc
@@ -0,0 +1,85 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include "base/eintr_wrapper.h"
+#include "breakpad/linux/exception_handler.h"
+#include "breakpad/linux/linux_libc_support.h"
+#include "breakpad/linux/linux_syscall_support.h"
+
+// This is defined in chrome/renderer/renderer_logging_linux.cc, it's the
+// static string containing the current active URL. We send this in the crash
+// report.
+namespace renderer_logging {
+extern std::string active_url;
+}
+
+static bool
+CrashHandler(const void* crash_context, size_t crash_context_size,
+             void* context) {
+  const int fd = (int) context;
+  int fds[2];
+  pipe(fds);
+
+  // The length of the control message:
+  static const unsigned kControlMsgSize =
+      CMSG_SPACE(sizeof(int)) + CMSG_SPACE(sizeof(struct ucred));
+
+  union {
+    struct kernel_msghdr msg;
+    struct msghdr sys_msg;
+  };
+  my_memset(&msg, 0, sizeof(struct kernel_msghdr));
+  struct kernel_iovec iov[2];
+  iov[0].iov_base = const_cast<void*>(crash_context);
+  iov[0].iov_len = crash_context_size;
+  iov[1].iov_base = const_cast<char*>(renderer_logging::active_url.data());
+  iov[1].iov_len = renderer_logging::active_url.size();
+
+  msg.msg_iov = iov;
+  msg.msg_iovlen = 2;
+  char cmsg[kControlMsgSize];
+  memset(cmsg, 0, kControlMsgSize);
+  msg.msg_control = cmsg;
+  msg.msg_controllen = sizeof(cmsg);
+
+  struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg);
+  hdr->cmsg_level = SOL_SOCKET;
+  hdr->cmsg_type = SCM_RIGHTS;
+  hdr->cmsg_len = CMSG_LEN(sizeof(int));
+  *((int*) CMSG_DATA(hdr)) = fds[1];
+  hdr = CMSG_NXTHDR(&sys_msg, hdr);
+  hdr->cmsg_level = SOL_SOCKET;
+  hdr->cmsg_type = SCM_CREDENTIALS;
+  hdr->cmsg_len = CMSG_LEN(sizeof(struct ucred));
+  struct ucred *cred = reinterpret_cast<struct ucred*>(CMSG_DATA(hdr));
+  cred->uid = getuid();
+  cred->gid = getgid();
+  cred->pid = getpid();
+
+  HANDLE_EINTR(sys_sendmsg(fd, &msg, 0));
+  sys_close(fds[1]);
+
+  char b;
+  HANDLE_EINTR(sys_read(fds[0], &b, 1));
+
+  return true;
+}
+
+void EnableRendererCrashDumping() {
+  // When the browser forks off our process, it installs the crash signal file
+  // descriptor in this slot:
+  static const int kMagicCrashSignalFd = 4;
+
+  // We deliberately leak this object.
+  google_breakpad::ExceptionHandler* handler = 
+      new google_breakpad::ExceptionHandler("" /* unused */, NULL, NULL,
+                                            (void*) kMagicCrashSignalFd, true);
+  handler->set_crash_handler(CrashHandler);
+}