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8818 :: Using waitForExit when a timeout is given, on a process blocked by IO

• jarv (orginal) [2022-01-17T12:31:12+01:00] view original

  Using waitForExit I see different behavior in the stdlib when a process is blocked on IO

  Example that doesn't timeout:

  import osproc
  import streams
  
  let args = ["-c", "cat"]
  let process = startProcess(command = "/bin/sh", args = args)
  let ret = waitForExit(p = process, timeout = 1000)
  
  let strm = process.outputStream()
  echo strm.readAll()
  echo ret
  Run

  https://play.nim-lang.org/#ix=3zQo

  While this times out as expected:

  import osproc
  import streams
  
  let args = ["-c", "sleep 5"]
  let process = startProcess(command = "/bin/sh", args = args)
  let ret = waitForExit(p = process, timeout = 1000)
  
  let strm = process.outputStream()
  echo strm.readAll()
  echo ret
  Run

  For my application, I passing user provided strings into startProcess and would like to detect a timeout if possible.

  Note I also opened https://github.com/nim-lang/Nim/issues/18894 but thought that maybe I would get some ideas on whether this is a bug by posting here.

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