Fix core dump reporting from devctl

[imp]

Summary

Create new devctl_safe_quote_sb to copy a source string into a struct sbuf to make it safe. Callers are expected to add the " " around it, if needed.

Fix devctl generation for core files.

We have a problem with vn_fullpath_global when the file exists. Work
around it by printing the full path if the core file name starts with /,
or current working directory followed by the filename if not.

[imp]

• Create new devctl_safe_quote_sb to copy a source string into a struct
• Fix devctl generation for core files.
• pccard: recode to use devctl_safe_quote_sb instead of devctl_safe_quote.
• Remove devctl_safe_quote since it's now unused.

[imp]

sys/dev/pccard/pccard.c

43

This change, and the interface removal are separate commits.

sys/kern/kern_sig.c

3546–3560

This is the meat of the change. There's likely better ways to do this, but this one works when the file exists so is better than the old way. It didn't and we'd lose reporting events.

[imp]

349fcda43009d / r335690 landed this change.