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| author | Fred Drake <fdrake@acm.org> | 2001-09-11 19:56:51 (GMT) |
|---|---|---|
| committer | Fred Drake <fdrake@acm.org> | 2001-09-11 19:56:51 (GMT) |
| commit | 098d7fae39fea0adc976edb7c1060054be4b467e (patch) | |
| tree | c2dc4ab6d15d51f9b5b45fa6c9221486968025e4 /Doc/lib/libpopen2.tex | |
| parent | 7b07a41e9f078065b966a2414a24c0e5b7889ef7 (diff) | |
| download | cpython-098d7fae39fea0adc976edb7c1060054be4b467e.zip cpython-098d7fae39fea0adc976edb7c1060054be4b467e.tar.gz cpython-098d7fae39fea0adc976edb7c1060054be4b467e.tar.bz2 | |
Document clearly that the only way to retrieve the return code from the
child processes is to use the Popen3 and Popen4 classes.
This fixes SF bug #460512.
Diffstat (limited to 'Doc/lib/libpopen2.tex')
| -rw-r--r-- | Doc/lib/libpopen2.tex | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/lib/libpopen2.tex b/Doc/lib/libpopen2.tex index add0af1..8cdf0f5 100644 --- a/Doc/lib/libpopen2.tex +++ b/Doc/lib/libpopen2.tex @@ -24,6 +24,13 @@ this is needed to determine whether the file objects should be opened in binary or text mode. The default value for \var{mode} is \code{'t'}. +The only way to retrieve the return codes for the child processes is +by using the \method{poll()} or \method{wait()} methods on the +\class{Popen3} and \class{Popen4} classes; these are only available on +\UNIX. This information is not available when using the +\function{popen2()}, \function{popen3()}, and \function{popen4()} +functions, or the equivalent functions in the \refmodule{os} module. + \begin{funcdesc}{popen2}{cmd\optional{, bufsize\optional{, mode}}} Executes \var{cmd} as a sub-process. Returns the file objects \code{(\var{child_stdout}, \var{child_stdin})}. |