[issue33384] Build does not work with closed stdin

[Martin Husemann]

New submission from Martin Husemann :

When building python extensions in the background w/o stdin (and stderr and 
stdout redirected to a log file), the invocation of setup.py fails.

Normal build in a shell:

Example from pyexpat:
> /usr/pkg/bin/python3.6  setup.py  build
running build
running build_ext
building 'pyexpat' extension
creating build
creating build/temp.netbsd-8.99.14-amd64-3.6
creating build/temp.netbsd-8.99.14-amd64-3.6/Modules
gcc -DNDEBUG -O2 -pipe -D_FORTIFY_SOURCE=2 -I/usr/include -I/usr/pkg/include 
-O2 -pipe -D_FORTIFY_SOURCE=2 -I/usr/include -I/usr/pkg/include/python3.6 
-I/usr/include -I/usr/pkg/include/python3.6 -fPIC -DHAVE_EXPAT_H 
-I/work/pkgobj/textproc/py-expat/work/.buildlink/include 
-I/usr/pkg/include/python3.6 -c Modules/pyexpat.c -o 
build/temp.netbsd-8.99.14-amd64-3.6/Modules/pyexpat.o
creating build/lib.netbsd-8.99.14-amd64-3.6
gcc -pthread -shared -L. -L/usr/lib -Wl,-R/usr/lib -L/usr/pkg/lib 
-Wl,-R/usr/pkg/lib -L/usr/X11R7/lib -Wl,-R/usr/X11R7/lib -L/usr/lib 
-Wl,-R/usr/lib -L/usr/pkg/lib -Wl,-R/usr/pkg/lib -L/usr/X11R7/lib 
-Wl,-R/usr/X11R7/lib -L/usr/lib -Wl,-R/usr/lib -Wl,-R/usr/pkg/lib -O2 -pipe 
-D_FORTIFY_SOURCE=2 -I/usr/include -I/usr/pkg/include/python3.6 -I/usr/include 
-I/usr/pkg/include/python3.6 
build/temp.netbsd-8.99.14-amd64-3.6/Modules/pyexpat.o 
-L/work/pkgobj/textproc/py-expat/work/.buildlink/lib -L/usr/pkg/lib 
-Wl,-R/work/pkgobj/textproc/py-expat/work/.buildlink/lib -lexpat -lpython3.6 -o 
build/lib.netbsd-8.99.14-amd64-3.6/pyexpat.so


But if invoked as 

> ( sleep 15; /usr/pkg/bin/python3.6  setup.py  build ) >/tmp/log 2>&1 &
> ^D

and then watching /tmp/log from another session:

Fatal Python error: Py_Initialize: can't initialize sys standard streams
OSError: [Errno 9] Bad file descriptor

Current thread 0x75b4e4cee800 (most recent call first):
[1]   Abort trap (core dumped) /usr/pkg/bin/pyt...

--
components: Build
messages: 315886
nosy: MartinHusemann
priority: normal
severity: normal
status: open
title: Build does not work with closed stdin
type: enhancement
versions: Python 3.6

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[issue33384] Build does not work with closed stdin

[Martin Husemann]

Martin Husemann  added the comment:

You need to exit the parent shell, to get the original stdin revoke(2)'d.
That is: the Ctrl-D in the original descritpion is not line noise. Sorry, 
should have been more explicit (or used "exit" or something instead)

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