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Verify the client is listening after startup.

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Polling IsDataPortListening is the only reliable check: probing the port
itself cannot distinguish the client's listener from another process
holding it.
This commit is contained in:
Bartosz Taudul
2026-08-30 16:43:27 +02:00
parent e87b7c873e
commit d498829518
1 changed files with 38 additions and 0 deletions
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38
monitor/src/monitor.cpp
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@@ -445,6 +445,15 @@ static int FindPidsByComm( const char* name, pid_t* outPids, int maxPids )
return count;
}
static bool VerifyClientListening()
{
for( int i = 0; i < 40; i++ )
{
if( tracy::IsDataPortListening() ) return true;
usleep( 125000 );
}
return false;
}
static int RunAttached( pid_t pid )
{
if( kill( pid, 0 ) != 0 )
@@ -474,6 +483,19 @@ static int RunAttached( pid_t pid )
if( !PreflightSamplingEvent( pid, kernelFrames, hwStats, hwErrno ) ) return 1;
tracy::StartupProfiler();
if( !VerifyClientListening() )
{
if( const char* port = getenv( "TRACY_PORT" ) )
{
fprintf( stderr, "The client could not listen on port %s (the port is most likely in use, or the bind was denied). Retry, or choose another port with --port.\n", port );
}
else
{
fprintf( stderr, "The client could not listen on any of the scan ports 8086-8105 (they are most likely all in use, or the bind was denied). Retry, or choose another port with --port.\n" );
}
tracy::ShutdownProfiler();
return 1;
}
PrintStartupReport( kernelFrames, hwStats, hwErrno );
@@ -593,6 +615,22 @@ static int RunForked( int argc, char** argv )
return 2;
}
if( !VerifyClientListening() )
{
if( const char* port = getenv( "TRACY_PORT" ) )
{
fprintf( stderr, "The client could not listen on port %s (the port is most likely in use, or the bind was denied). Retry, or choose another port with --port.\n", port );
}
else
{
fprintf( stderr, "The client could not listen on any of the scan ports 8086-8105 (they are most likely all in use, or the bind was denied). Retry, or choose another port with --port.\n" );
}
kill( childPid, SIGKILL );
waitpid( childPid, nullptr, 0 );
tracy::ShutdownProfiler();
return 1;
}
PrintStartupReport( kernelFrames, hwStats, hwErrno );
// Wait for child to exit, or for a signal