[Plash] Question about file descriptors

[Thomas Leonard]

I'm trying to pass a file descriptor to a process running under
pola-run, but it doesn't seem to work:

$ python -c 'import os; print os.read(5, 100)' 5< /etc/hosts
127.0.0.1       localhost

$ pola-run -f / -e python -c 'import os; print os.read(5, 100)' 5< /etc/hosts
OSError: [Errno 9] Bad file descriptor

Strangely, though, this works:

$ python -c 'import os; print file("/proc/self/fd/5").read()' 5< /etc/hosts
127.0.0.1       localhost

Also happens with bash:

$ pola-run -fw=/ --prog /bin/bash 5< /etc/hosts
cat <&5
/bin/bash: line 1: 5: Bad file descriptor
cat /proc/self/fd/5
127.0.0.1       localhost

It works if I use FD 0 rather than 5, too. I see _set_up_fds() calls
close() a lot. Is this necessary?

This is using the Lenny package on Ubuntu/Intrepid.

Thanks,


-- 
Dr Thomas Leonard               ROX desktop / Zero Install
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