log why the permission is denied

Posted Jan 21, 2013 9:07 UTC (Mon) by dlang (guest, #313)
In reply to: log why the permission is denied by jorgegv
Parent article: Making EPERM friendlier

syslog is userspace, and it can handle large volumes of logs and filter them efficently ;-)

that said, if the logs are not written sanely, filtering them can be expensive, but given that we are talking about adding the logging now, we should be able to make this be something easy to filter.

to post comments

log why the permission is denied

Posted Jan 21, 2013 10:16 UTC (Mon) by meuh (guest, #22042) [Link] (3 responses)

Why not introduce a non-POSIX, Linux specific way to turn on error logging for "critical" code path, the same way one can enable logging in Bourne shell: set -x, then disable after the "critical" code path: set +x.

Sadly, I'm not really convinced myself: even if there's only one POSIX function in the "critical" section, this call could be translated in multiple library function and syscall calls. And this is going to create some annoyance when reading logs.

log why the permission is denied

Posted Jan 21, 2013 10:26 UTC (Mon) by meuh (guest, #22042) [Link] (2 responses)

And let's be funnier: add SIG_ERRNO, a signal triggered when a syscall return a an error code, and extend siginfo_t to hold error description.
Then have the kernel export, as part of the VDSO, an error decoder library.
But to be expandable, a user space library might be better.

log why the permission is denied

Posted Jan 21, 2013 23:19 UTC (Mon) by cmccabe (guest, #60281) [Link] (1 responses)

Not enterprisey enough.

We need ErrnoKit, a DBUS-enabled daemon that sends XML messages to a Mono process, which logs them in a custom binary format to the GNOME3 registry. Then they can be retrieved by the client application through SOAP requests to a CORBA object broker.

log why the permission is denied

Posted Jan 22, 2013 9:17 UTC (Tue) by niner (guest, #26151) [Link]

You're missing the most important piece: the error messages need to get stored in the Cloud! There the localization can be crowd sourced and error message profiles be monetized. I think, we should put this project up on kickstarter immediately...