lshal: Add fqname to debug error messages
If any error comes up when invoking debug, write fqname and the error
message to the error output stream.
Test: manual. Add addPostCommandTask to a HAL that keeps writing to the
fd after debug() finishes. lshal debug terminates with fqname and
the error message `timeout reading from pipe, output may be truncated.`
Fixes: 169247570
Change-Id: Idf8944e3cde08dc86766b144c4a3037cbcf6b3dc
diff --git a/cmds/lshal/PipeRelay.cpp b/cmds/lshal/PipeRelay.cpp
index 820679f..4e97636 100644
--- a/cmds/lshal/PipeRelay.cpp
+++ b/cmds/lshal/PipeRelay.cpp
@@ -23,7 +23,6 @@
#include <atomic>
-#include <android-base/logging.h>
#include <utils/Thread.h>
namespace android {
@@ -31,8 +30,15 @@
static constexpr struct timeval READ_TIMEOUT { .tv_sec = 1, .tv_usec = 0 };
+static std::string getThreadName(std::string interfaceName, const std::string &instanceName) {
+ auto dot = interfaceName.rfind(".");
+ if (dot != std::string::npos) interfaceName = interfaceName.substr(dot + 1);
+ return "RelayThread_" + interfaceName + "_" + instanceName;
+}
+
struct PipeRelay::RelayThread : public Thread {
- explicit RelayThread(int fd, std::ostream &os);
+ explicit RelayThread(int fd, std::ostream &os, const NullableOStream<std::ostream> &err,
+ const std::string &fqName);
bool threadLoop() override;
void setFinished();
@@ -40,6 +46,7 @@
private:
int mFd;
std::ostream &mOutStream;
+ NullableOStream<std::ostream> mErrStream;
// If we were to use requestExit() and exitPending() instead, threadLoop()
// may not run at all by the time ~PipeRelay is called (i.e. debug() has
@@ -47,13 +54,17 @@
// read() are executed until data are drained.
std::atomic_bool mFinished;
+ std::string mFqName;
+
DISALLOW_COPY_AND_ASSIGN(RelayThread);
};
////////////////////////////////////////////////////////////////////////////////
-PipeRelay::RelayThread::RelayThread(int fd, std::ostream &os)
- : mFd(fd), mOutStream(os), mFinished(false) {}
+PipeRelay::RelayThread::RelayThread(int fd, std::ostream &os,
+ const NullableOStream<std::ostream> &err,
+ const std::string &fqName)
+ : mFd(fd), mOutStream(os), mErrStream(err), mFinished(false), mFqName(fqName) {}
bool PipeRelay::RelayThread::threadLoop() {
char buffer[1024];
@@ -66,13 +77,14 @@
int res = TEMP_FAILURE_RETRY(select(mFd + 1, &set, nullptr, nullptr, &timeout));
if (res < 0) {
- PLOG(INFO) << "select() failed";
+ mErrStream << "debug " << mFqName << ": select() failed";
return false;
}
if (res == 0 || !FD_ISSET(mFd, &set)) {
if (mFinished) {
- LOG(WARNING) << "debug: timeout reading from pipe, output may be truncated.";
+ mErrStream << "debug " << mFqName
+ << ": timeout reading from pipe, output may be truncated.";
return false;
}
// timeout, but debug() has not returned, so wait for HAL to finish.
@@ -83,7 +95,7 @@
ssize_t n = TEMP_FAILURE_RETRY(read(mFd, buffer, sizeof(buffer)));
if (n < 0) {
- PLOG(ERROR) << "read() failed";
+ mErrStream << "debug " << mFqName << ": read() failed";
}
if (n <= 0) {
@@ -101,8 +113,9 @@
////////////////////////////////////////////////////////////////////////////////
-PipeRelay::PipeRelay(std::ostream &os)
- : mInitCheck(NO_INIT) {
+PipeRelay::PipeRelay(std::ostream &os, const NullableOStream<std::ostream> &err,
+ const std::string &interfaceName, const std::string &instanceName)
+ : mInitCheck(NO_INIT) {
int res = pipe(mFds);
if (res < 0) {
@@ -110,8 +123,8 @@
return;
}
- mThread = new RelayThread(mFds[0], os);
- mInitCheck = mThread->run("RelayThread");
+ mThread = new RelayThread(mFds[0], os, err, interfaceName + "/" + instanceName);
+ mInitCheck = mThread->run(getThreadName(interfaceName, instanceName).c_str());
}
void PipeRelay::CloseFd(int *fd) {