Zbigniew Jędrzejewski-Szmek
858cb6e49e
We had errno_to_name() which works for "known" errnos, and returns NULL for unknown ones, and then ERRNO_NAME which always returns an answer, possibly just a number as a string, but requires a helper buffer. It is possible for the kernel to add a new errno. We recently learned that some architectures define custom errno names. Or for some function to unexpectedly return a bogus errno value. In almost all cases it's better to print that value rather than "n/a" or "(null)". So let's use ERRNO_NAME is most error handling code. Noteably, our code wasn't very good in handling the potential NULL, so in various places we could print "(null)". Since this is supposed to be used most of the time, let's shorten the names to ERRNO_NAME/errno_name. There are a few places where we don't want to use the fallback path, in particular for D-Bus error names or when saving the error name. Let's rename errno_to_name() to errno_name_no_fallback() to make the distinction clearer.
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