Bug 473422 - gpm -D does not write log if stdout is file or pipe
gpm -D does not write log if stdout is file or pipe
Product: Fedora
Classification: Fedora
Component: gpm (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Zdenek Prikryl
Fedora Extras Quality Assurance
Depends On:
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Reported: 2008-11-28 08:11 EST by Denys Vlasenko
Modified: 2009-01-07 04:05 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-01-07 04:05:10 EST
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Description Denys Vlasenko 2008-11-28 08:11:44 EST
gpm -D is a option which makes gpm emit some debug info to stdout. I am using it for many years. In recent version it has been broken.

When stdout is a tty, gpm does print some messages:

# gpm -D -2 -m /dev/not_exist -t bare
*** info [startup.c(95)]: Started gpm successfully. Entered daemon mode.

If I want to process them with some program:

# gpm -D -2 -m /dev/not_exist -t bare | cat

No output.

Same happens if I redirect output to a file:

# gpm -D -2 -m /dev/not_exist -t bare >FILE
# ls -l FILE
-rw-r--r-- 1 root root 0 2008-11-27 14:57 FILE

strace reveals that it seems to be done intentionally. gpm tests the type of stdout:

fstat(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0

and if it is not a tty, it doenst print anything. What is the rationale of such a strange behavior?

Another bug is that gpm closes stdin/out/err and loses all further messages (writes them to closed fds), but I was told it is already fixed in newer version.
Comment 1 Fedora Update System 2009-01-06 04:22:45 EST
gpm-1.20.5-2.fc10 has been submitted as an update for Fedora 10.
Comment 2 Fedora Update System 2009-01-07 04:05:03 EST
gpm-1.20.5-2.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.

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