#include "trace_file.hpp"
#include "trace_writer_local.hpp"
#include "trace_format.hpp"
+#include "os_backtrace.hpp"
namespace trace {
LocalWriter::LocalWriter() :
acquired(0)
{
+ os::log("apitrace: loaded\n");
+
// Install the signal handlers as early as possible, to prevent
// interfering with the application's signal handling.
os::setExceptionCallback(exceptionCallback);
LocalWriter::~LocalWriter()
{
os::resetExceptionCallback();
+ checkProcessId();
}
void
os::abort();
}
+ pid = os::getCurrentProcessId();
+
#if 0
// For debugging the exception handler
*((int *)0) = 0;
static OS_THREAD_SPECIFIC_PTR(void)
thread_num;
-unsigned LocalWriter::beginEnter(const FunctionSig *sig) {
+void LocalWriter::checkProcessId(void) {
+ if (m_file->isOpened() &&
+ os::getCurrentProcessId() != pid) {
+ // We are a forked child process that inherited the trace file, so
+ // create a new file. We can't call any method of the current
+ // file, as it may cause it to flush and corrupt the parent's
+ // trace, so we effectively leak the old file object.
+ m_file = File::createSnappy();
+ // Don't want to open the same file again
+ os::unsetEnvironment("TRACE_FILE");
+ open();
+ }
+}
+
+unsigned LocalWriter::beginEnter(const FunctionSig *sig, bool fake) {
mutex.lock();
++acquired;
+ checkProcessId();
if (!m_file->isOpened()) {
open();
}
assert(this_thread_num);
unsigned thread_id = this_thread_num - 1;
- return Writer::beginEnter(sig, thread_id);
+ unsigned call_no = Writer::beginEnter(sig, thread_id);
+ if (!fake && os::backtrace_is_needed(sig->name)) {
+ std::vector<RawStackFrame> backtrace = os::get_backtrace();
+ beginBacktrace(backtrace.size());
+ for (unsigned i = 0; i < backtrace.size(); ++i) {
+ writeStackFrame(&backtrace[i]);
+ }
+ endBacktrace();
+ }
+ return call_no;
}
void LocalWriter::endEnter(void) {
} else {
++acquired;
if (m_file->isOpened()) {
- os::log("apitrace: flushing trace due to an exception\n");
- m_file->flush();
+ if (os::getCurrentProcessId() != pid) {
+ os::log("apitrace: ignoring exception in child process\n");
+ } else {
+ os::log("apitrace: flushing trace due to an exception\n");
+ m_file->flush();
+ }
}
--acquired;
}