Re: [Libguestfs] [PATCH 1/2] Define .errno_is_preserved constant instead of a .errno_is_reliable callback.

On 02/06/2017 08:57 AM, Richard W.M. Jones wrote: > The callback doesn't make much sense: Could the value change > per-connection? Unlikely. This is a property of the plugin as a > whole. > > I changed the name to "errno_is_preserved", because it's not about the > reliability of errno, but about whether errno is preserved across > calls. Makes it possible for a regression in C plugins (previously, such plugins implicitly behaved as if .errno_is_preserved was 1, now such plugins default to .errno_is_preserved == 0 unless explicitly set and recompiled against newer headers). Thus, such plugins will now fail with EIO where they used to fail with reasonable errno values. But I guess we can live with that.