08a8136801
This implements the crash helper service used to move child process crash report generation out of the main process and into its own process. This is implemented as a separate executable that is launched on startup by the main process on the desktop platforms and as a service hosted by a separate process on Android. The crash helper process is started when the first exception handler is set on desktop platforms and before loading libxul on Android. In both cases starting this process happens asynchronously so that neither the main process nor child processes have to wait for it to come up. If a crash happens before the crash helper has started, the crashed process will wait for it to fully come up and then proceed with regular crash generation. IPC with the crash helper is implemented using Unix sockets on Linux and macOS with the former using sequential packets and the latter using stream sockets. On Windows we use named pipes. In all cases the choice of IPC was dictated both by the requirement to eventually talk directly to child processes from within the sandbox, and to external processes in case of Windows as the Windows Error Reporting exception handler must be able to reach out to the helper from within a restricted context. These particular requirements are not used yet but will be as we move more logic out of the main process logic. Differential Revision: https://phabricator.services.mozilla.com/D231083
68 lines
1.8 KiB
C++
68 lines
1.8 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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#include <cstdlib>
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#if defined(XP_WIN)
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# include <windows.h> // for HANDLE
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#endif // defined(XP_WIN)
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#if defined(XP_LINUX)
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// For DirectAuxvDumpInfo
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# include "mozilla/toolkit/crashreporter/rust_minidump_writer_linux_ffi_generated.h"
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#endif // defined(XP_LINUX)
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#include "mozilla/crash_helper_ffi_generated.h"
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static int parse_int_or_exit(const char* aArg) {
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errno = 0;
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long value = strtol(aArg, nullptr, 10);
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if ((errno != 0) || (value < 0) || (value > INT_MAX)) {
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exit(EXIT_FAILURE);
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}
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return static_cast<int>(value);
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}
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static BreakpadRawData parse_breakpad_data(const char* aArg) {
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#if defined(XP_MACOSX)
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return aArg;
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#elif defined(XP_WIN)
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// This is always an ASCII string so we don't need a proper conversion.
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size_t len = strlen(aArg);
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uint16_t* data = new uint16_t[len + 1];
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for (size_t i = 0; i < len; i++) {
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data[i] = aArg[i];
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}
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data[len] = 0;
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return data;
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#else // Linux and friends
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return parse_int_or_exit(aArg);
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#endif
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}
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static void free_breakpad_data(BreakpadRawData aData) {
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#if defined(XP_WIN)
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delete aData;
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#endif
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}
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int main(int argc, char* argv[]) {
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if (argc < 6) {
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exit(EXIT_FAILURE);
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}
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Pid client_pid = static_cast<Pid>(parse_int_or_exit(argv[1]));
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BreakpadRawData breakpad_data = parse_breakpad_data(argv[2]);
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char* minidump_path = argv[3];
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char* listener = argv[4];
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char* connector = argv[5];
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int res = crash_generator_logic_desktop(client_pid, breakpad_data,
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minidump_path, listener, connector);
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free_breakpad_data(breakpad_data);
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exit(res);
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}
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