Add a method to get the binderfs transactions for a given process
Get the section in /dev/binderfs/binder_logs/transactions for that PID as a
single string.
Test: adb shell am hang
Bug: 316970771
Change-Id: I951621379032550bd347341c9406da8a06fa7b29
diff --git a/libs/binderdebug/BinderDebug.cpp b/libs/binderdebug/BinderDebug.cpp
index a8f2cbf..19f3aad 100644
--- a/libs/binderdebug/BinderDebug.cpp
+++ b/libs/binderdebug/BinderDebug.cpp
@@ -199,4 +199,31 @@
return ret;
}
+status_t getBinderTransactions(pid_t pid, std::string& transactionsOutput) {
+ std::ifstream ifs("/dev/binderfs/binder_logs/transactions");
+ if (!ifs.is_open()) {
+ ifs.open("/d/binder/transactions");
+ if (!ifs.is_open()) {
+ LOG(ERROR) << "Could not open /dev/binderfs/binder_logs/transactions. "
+ << "Likely a permissions issue. errno: " << errno;
+ return -errno;
+ }
+ }
+
+ std::string line;
+ while (getline(ifs, line)) {
+ // The section for this pid ends with another "proc <pid>" for another
+ // process. There is only one entry per pid so we can stop looking after
+ // we've grabbed the whole section
+ if (base::StartsWith(line, "proc " + std::to_string(pid))) {
+ do {
+ transactionsOutput += line + '\n';
+ } while (getline(ifs, line) && !base::StartsWith(line, "proc "));
+ return OK;
+ }
+ }
+
+ return NAME_NOT_FOUND;
+}
+
} // namespace android