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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/LexicalPath.h>
#include <AK/MappedFile.h>
#include <Kernel/API/InodeWatcherEvent.h>
#include <LibCompress/Gzip.h>
#include <LibCore/File.h>
#include <LibCore/FileWatcher.h>
#include <LibCoreDump/Backtrace.h>
#include <LibCoreDump/Reader.h>
#include <serenity.h>
#include <spawn.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
static void wait_until_coredump_is_ready(const String& coredump_path)
{
while (true) {
struct stat statbuf;
if (stat(coredump_path.characters(), &statbuf) < 0) {
perror("stat");
VERIFY_NOT_REACHED();
}
if (statbuf.st_mode & 0400) // Check if readable
break;
usleep(10000); // sleep for 10ms
}
}
static bool compress_coredump(const String& coredump_path)
{
auto file_or_error = MappedFile::map(coredump_path);
if (file_or_error.is_error()) {
dbgln("Could not open coredump '{}': {}", coredump_path, file_or_error.error());
return false;
}
auto coredump_file = file_or_error.value();
auto compressed_coredump = Compress::GzipCompressor::compress_all(coredump_file->bytes());
if (!compressed_coredump.has_value()) {
dbgln("Could not compress coredump '{}'", coredump_path);
return false;
}
auto output_path = String::formatted("{}.gz", coredump_path);
auto output_file_or_error = Core::File::open(output_path, Core::OpenMode::WriteOnly);
if (output_file_or_error.is_error()) {
dbgln("Could not open '{}' for writing: {}", output_path, output_file_or_error.error());
return false;
}
auto output_file = output_file_or_error.value();
if (!output_file->write(compressed_coredump.value().data(), compressed_coredump.value().size())) {
dbgln("Could not write compressed coredump '{}'", output_path);
return false;
}
return true;
}
static void print_backtrace(const String& coredump_path)
{
auto coredump = CoreDump::Reader::create(coredump_path);
if (!coredump) {
dbgln("Could not open coredump '{}'", coredump_path);
return;
}
size_t thread_index = 0;
coredump->for_each_thread_info([&](auto& thread_info) {
CoreDump::Backtrace backtrace(*coredump, thread_info);
if (thread_index > 0)
dbgln();
dbgln("--- Backtrace for thread #{} (TID {}) ---", thread_index, thread_info.tid);
for (auto& entry : backtrace.entries())
dbgln("{}", entry.to_string(true));
++thread_index;
return IterationDecision::Continue;
});
}
static void launch_crash_reporter(const String& coredump_path, bool unlink_after_use)
{
pid_t child;
const char* argv[] = { "CrashReporter", coredump_path.characters(), unlink_after_use ? "--unlink" : nullptr, nullptr, nullptr };
if ((errno = posix_spawn(&child, "/bin/CrashReporter", nullptr, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
} else {
if (disown(child) < 0)
perror("disown");
}
}
int main()
{
if (pledge("stdio rpath wpath cpath proc exec", nullptr) < 0) {
perror("pledge");
return 1;
}
Core::BlockingFileWatcher watcher;
auto watch_result = watcher.add_watch("/tmp/coredump", Core::FileWatcherEvent::Type::ChildCreated);
if (watch_result.is_error()) {
warnln("Failed to watch the coredump directory: {}", watch_result.error());
VERIFY_NOT_REACHED();
}
while (true) {
auto event = watcher.wait_for_event();
VERIFY(event.has_value());
if (event.value().type != Core::FileWatcherEvent::Type::ChildCreated)
continue;
auto& coredump_path = event.value().event_path;
if (coredump_path.ends_with(".gz"))
continue; // stops compress_coredump from accidentally triggering us
dbgln("New coredump file: {}", coredump_path);
wait_until_coredump_is_ready(coredump_path);
auto compressed = compress_coredump(coredump_path);
print_backtrace(coredump_path);
launch_crash_reporter(coredump_path, compressed);
}
}
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