How to Capture Stack Traces from Go Processes Without Interruption?

Capturing Go Process Stacks Non-Invasively

To capture stack traces from all goroutines within a running Go process without interrupting its execution, follow these steps:

1. Establish a Signal Handler:

   <code class="go">import (
       "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)
   }</code>

2. Receive SIGQUIT Signal:

   The handler function within the goroutine will capture the SIGQUIT signal.

3. Generate Stack Trace:

   The runtime.Stack function is utilized to generate the stack trace for each goroutine.

4. Handle Memory Constraints:

   The stack trace buffer has a size limit. If the buffer is exceeded, the trace will be truncated.

5. Print Stack Traces:

   The generated stack traces will be printed to standard output.

By setting up this signal handler, you can effectively capture and display stack traces for all goroutines within the running Go process without modifying its source code or terminating its execution.

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