There might be. Or I might be holding it wrong. I'm about to post another
thread with a different angle on this. This thread was mis-framed.
On Mon, Jun 17, 2024 at 1:16 PM Harri L wrote:
> I’m wondering if there’s a specific reason you’re using io.Pipe instead
> of the Cmd.StdoutPipe helper? Wh
I’m wondering if there’s a specific reason you’re using io.Pipe instead of
the Cmd.StdoutPipe helper? When using io.Pipe you need to Close the pipe by
yourself, but when using the Cmd.StdoutPipe, the Cmd.Wait will close the
pipe for you.
Here’s a sample following your previous example:
func m
Ah!
I apologize... in reducing it to a compact example I didn't notice that I
changed the semantics of what the code was doing. You are, of course, right
about the cause of the deadlock in this code.
That said, working backward from the self-contained example to my full code
clarified the actual
It hangs because cmd.Run() waits for the process to complete - and with nothing reading the pipe it will never complete. On Jun 16, 2024, at 9:33 PM, Robert Engels wrote:It looks like you don’t have anything reading from the pipe so it’s going to hang. On Jun 16, 2024, at 8:54 PM, Salvatore Domen
It looks like you don’t have anything reading from the pipe so it’s going to hang. On Jun 16, 2024, at 8:54 PM, Salvatore Domenick Desiano wrote:Simpler self-contained example, same result:func main() { cmdName := "/bin/bash" cmdArgs := []string{"-c", "while true; do echo step; sleep 1; done"}cmd
Simpler self-contained example, same result:
func main() {
cmdName := "/bin/bash"
cmdArgs := []string{"-c", "while true; do echo step; sleep 1; done"}
cmdStdoutR, cmdStdoutW := io.Pipe()
cmd := exec.Command(cmdName, cmdArgs...)
cmd.Stdout = cmdStdoutW
if err := cmd.Run(); err != nil {
fmt.Print
I hope this isn't a red herring but in constructing a self-contained
example I triggered a deadlock. Perhaps the deadlock is the answer to my
question or perhaps it is another issue. Either way this code does not seem
malformed:
func main() {
cmdName := "/bin/bash"
cmdArgs := []string{
"-c",
"w
On Sun, Jun 16, 2024 at 3:20 PM Salvatore Domenick Desiano
wrote:
>
> I'm hoping y'all can help me get the correct semantics for code that sets up
> an external process, replaces Stdin, Stderr, Stdout, runs the command, calls
> exec.Command.Wait() and handles SIGKILL correctly.
>
> I've read mor
I'm hoping y'all can help me get the correct semantics for code that sets
up an external process, replaces Stdin, Stderr, Stdout, runs the command,
calls exec.Command.Wait() and handles SIGKILL correctly.
I've read more than two dozen threads, PRs, and bug reports about how
exec.Command interacts
