Gabriele Svelto
a805e95c66
This handles the scenario when mozcrash attempts to terminate a process, but the process has already shut down, which is a possible race within this code. It also changes the minidumpwriter helper so that it won't report an error when trying to capture a minidump of a process that has already stopped running. Differential Revision: https://phabricator.services.mozilla.com/D271387
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Given a PID and a path to a target file, write a minidump of the
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* corresponding process in that file. This is taken more or less
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* verbatim from mozcrash and translated to C++ to avoid problems
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* writing a minidump of 64 bit Firefox from a 32 bit python.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <windows.h>
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#include <dbghelp.h>
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int wmain(int argc, wchar_t** argv) {
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if (argc != 3) {
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fprintf(stderr, "Usage: minidumpwriter <PID> <DUMP_FILE>\n");
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return 1;
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}
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DWORD pid = (DWORD)_wtoi(argv[1]);
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if (pid <= 0) {
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fprintf(stderr, "Usage: minidumpwriter <PID> <DUMP_FILE>\n");
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return 1;
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}
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wchar_t* dumpfile = argv[2];
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int rv = 1;
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HANDLE hProcess =
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OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 0, pid);
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if (!hProcess) {
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fprintf(stderr, "Couldn't get handle for %lu\n", pid);
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return rv;
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}
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HANDLE file = CreateFileW(dumpfile, GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL, nullptr);
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if (file == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "Couldn't open dump file at %S\n", dumpfile);
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CloseHandle(hProcess);
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return rv;
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}
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rv = 0;
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if (!MiniDumpWriteDump(hProcess, pid, file, MiniDumpNormal, nullptr, nullptr,
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nullptr)) {
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fprintf(stderr, "Error 0x%lX in MiniDumpWriteDump\n", GetLastError());
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DWORD status = 0;
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if (!GetExitCodeProcess(hProcess, &status) || (status == STILL_ACTIVE)) {
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// We return an error only if the process was still running. If we failed
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// because the process had already been terminated then don't consider it
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// an actual error.
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rv = 1;
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}
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}
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CloseHandle(file);
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CloseHandle(hProcess);
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return rv;
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}
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