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Only supply popen2, popen3 when fork exists. 

(This avoids defining non-working versions of these on the Mac.)
This commit is contained in:
Guido van Rossum 2000-09-19 03:04:52 +00:00
parent 9e8181b809
commit d9a8e96543
1 changed files with 14 additions and 12 deletions
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26
Lib/os.py
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@ -454,16 +454,18 @@ def spawnlpe(mode, file, *args):
return spawnvpe(mode, file, args[:-1], env) return spawnvpe(mode, file, args[:-1], env)
if not _exists("popen2"): # Supply popen2 etc. (for Unix)
def popen2(cmd, mode="t", bufsize=-1): if _exists("fork"):
assert mode[:1] in ("b", "t") if not _exists("popen2"):
import popen2 def popen2(cmd, mode="t", bufsize=-1):
stdout, stdin = popen2.popen2(cmd, bufsize) assert mode[:1] in ("b", "t")
return stdin, stdout import popen2
stdout, stdin = popen2.popen2(cmd, bufsize)
return stdin, stdout
if not _exists("popen3"): if not _exists("popen3"):
def popen3(cmd, mode="t", bufsize=-1): def popen3(cmd, mode="t", bufsize=-1):
assert mode[:1] in ("b", "t") assert mode[:1] in ("b", "t")
import popen2 import popen2
stdout, stdin, stderr = popen2.popen3(cmd, bufsize) stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
return stdin, stdout, stderr return stdin, stdout, stderr