From: Guido van Rossum <guido@python.org>
Date: Tue, 19 Sep 2000 03:04:52 +0000 (+0000)
Subject: Only supply popen2, popen3 when fork exists.
X-Git-Tag: v2.0b2~210
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d9a8e965433e03f598089153f3c51ac6d6fb295f;p=python

Only supply popen2, popen3 when fork exists.
(This avoids defining non-working versions of these on the Mac.)
---

diff --git a/Lib/os.py b/Lib/os.py
index c804c3ab86..70af0a9406 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -454,16 +454,18 @@ otherwise return -SIG, where SIG is the signal that killed it. """
         return spawnvpe(mode, file, args[:-1], env)
 
 
-if not _exists("popen2"):
-    def popen2(cmd, mode="t", bufsize=-1):
-        assert mode[:1] in ("b", "t")
-        import popen2
-        stdout, stdin = popen2.popen2(cmd, bufsize)
-        return stdin, stdout
-
-if not _exists("popen3"):
-    def popen3(cmd, mode="t", bufsize=-1):
-        assert mode[:1] in ("b", "t")
-        import popen2
-        stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
-        return stdin, stdout, stderr
+# Supply popen2 etc. (for Unix)
+if _exists("fork"):
+    if not _exists("popen2"):
+        def popen2(cmd, mode="t", bufsize=-1):
+            assert mode[:1] in ("b", "t")
+            import popen2
+            stdout, stdin = popen2.popen2(cmd, bufsize)
+            return stdin, stdout
+
+    if not _exists("popen3"):
+        def popen3(cmd, mode="t", bufsize=-1):
+            assert mode[:1] in ("b", "t")
+            import popen2
+            stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
+            return stdin, stdout, stderr