pid2md: generate a minidump from a running process

On Linux, this tool generates a minidump for given process. It requires
the permission to trace the process and access its /proc directory. This
is useful when a defective behavior of a process does not lead to a
crash. For example, it can be used by a watchdog or if a process does
not correctly respond to a termination request.

Change-Id: Iab501e42c064a537aea62831c471e395ff697186
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2539920
Reviewed-by: Mike Frysinger <vapier@chromium.org>

src/tools/linux/pid2md/pid2md.cc

@@ -0,0 +1,57 @@
+// Copyright (c) 2020, Google Inc.
+// 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.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// 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.
+
+// pid2md.cc: An utility to generate a minidump from a running process
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "client/linux/minidump_writer/minidump_writer.h"
+
+int main(int argc, char* argv[]) {
+  if (argc != 3) {
+    fprintf(stderr, "Usage: %s <process id> <minidump file>\n\n", argv[0]);
+    fprintf(stderr,
+            "A tool to generate a minidump from a running process. The process "
+            "resumes its\nactivity once the operation is completed. Permission "
+            "to trace the process is\nrequired.\n");
+    return EXIT_FAILURE;
+  }
+
+  pid_t process_id = atoi(argv[1]);
+  const char* minidump_file = argv[2];
+
+  if (!google_breakpad::WriteMinidump(minidump_file, process_id, process_id)) {
+    fprintf(stderr, "Unable to generate minidump.\n");
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}