merged #8624 manually; fixes #8442; closes #8575

tests/osproc/tstderr.nim

@@ -0,0 +1,32 @@
+discard """
+  output: '''--------------------------------------
+to stderr
+to stderr
+--------------------------------------
+'''
+"""
+import osproc, os, streams
+
+const filename = "ta_out".addFileExt(ExeExt)
+
+doAssert fileExists(getCurrentDir() / "tests" / "osproc" / filename)
+
+var p = startProcess(filename, getCurrentDir() / "tests" / "osproc",
+                     options={})
+
+try:
+  let stdoutStream = p.outputStream
+  let stderrStream = p.errorStream
+  var x = newStringOfCap(120)
+  var output = ""
+  while stderrStream.readLine(x.TaintedString):
+    output.add(x & "\n")
+
+  echo "--------------------------------------"
+  stdout.flushFile()
+  stderr.write output
+  stderr.flushFile()
+  echo "--------------------------------------"
+  stdout.flushFile()
+finally:
+  p.close()