


Dumping Go Process Stacks Non-Invasively
A running Go process can be analyzed without modifying its code or terminating it by leveraging its built-in stack dumping capability.
Method:
-
Signal Handling:
Establish a signal handler using os.Signal and syscall.SIGQUIT. The SIGQUIT signal instructs the Go runtime to dump all stack traces. -
Stack Trace Capture:
In a goroutine, use runtime.Stack to capture the stack traces and format them into a buffer. Initially, the buffer should be large enough to accommodate the stack traces, and the length of the actual trace is returned by runtime.Stack. -
Signal Notification:
Notify the signal handler that it should listen for SIGQUIT signals. When received, the handler activates the stack trace capturing process. -
Run the Process:
Continue running the Go process as usual.
When sending a SIGQUIT signal to the process (e.g., using ctrl \ on Windows or kill -SIGQUIT process_pid on Linux), the defined signal handler will intercept it and invoke the stack trace capture routine. The captured traces will be printed to the standard output, providing a detailed snapshot of the process's goroutine stacks.
Code Example:
<code class="go">import ( "fmt" "os" "os/signal" "runtime" "syscall" ) func main() { sigChan := make(chan os.Signal) go func() { stacktrace := make([]byte, 8192) for _ = range sigChan { length := runtime.Stack(stacktrace, true) fmt.Println(string(stacktrace[:length])) } }() signal.Notify(sigChan, syscall.SIGQUIT) // ... Process Logic }</code>
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