[issue5898] Hang in Popen.wait() when another process has been created

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Closing because OP did not disagree with Wong's explanation of why not a bug. 
If someone disagreea and wants to reopen, this should be verified and marked 
for a current version (2.7+)

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nosy: +tjreedy
resolution:  -> invalid
status: open -> closed

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[issue5898] Hang in Popen.wait() when another process has been created

[Steven K. Wong]

Steven K. Wong  added the comment:

See this related issue: http://bugs.python.org/issue7213

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[issue5898] Hang in Popen.wait() when another process has been created

[Steven K. Wong]

Steven K. Wong  added the comment:

See this related issue: http://bugs.python.org/issue7448

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[issue5898] Hang in Popen.wait() when another process has been created

[Steven K. Wong]

Steven K. Wong  added the comment:

I think the hang is not a bug. Take a look at the Popen documentation on 
close_fds. If you specify close_fds=True when creating proc2, the hang will not 
happen when you remove the "proc2.stdin.close()" line.

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nosy: +steven.k.wong

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[issue5898] Hang in Popen.wait() when another process has been created

[François Granade]

François Granade  added the comment:

Note that I use this wait(), otherwise, on CygWin, proc1 does not
properly dies, and leaves opened (undeletable - that's windows !) files
around

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[issue5898] Hang in Popen.wait() when another process has been created

[François Granade]

New submission from François Granade :

If I remove the "proc2.stdin.close()" in the script below, the
"proc1.wait()" will hang. Tested on MacOS, Linux, CygWin on 2.5.2 and
2.6. Is it a bug ?

from subprocess import Popen, PIPE
proc1 = Popen('cat -', shell=True, stdin=PIPE, stdout=PIPE)
proc2 = Popen('cat -', shell=True, stdin=PIPE, stdout=PIPE)
# Removing this line make the proc1.wait() hang
proc2.stdin.close()

proc1.stdin.close()
proc1.wait()

--
components: Library (Lib)
messages: 86901
nosy: farialima
severity: normal
status: open
title: Hang in Popen.wait() when another process has been created
type: behavior
versions: Python 2.5, Python 2.6

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