"Error mapping file into memory"?

[Joshua Root]

Lee Bast wrote:
> 	Latest version of MacPorts & Xcode on a Mac Pro 2010 12-core running 10.13, 64GB memory. After performing a normal selfupdate/upgrade outdated routine today I got a pile of "Error mapping file into memory" for various ports/libraries. I rolled back and rebooted then tried again and it installed. But I then tried to do a plain install of mpv and it got all the way through to scanning binaries for linking errors before show the same issue:
> 
>> --->  Cleaning mpv
>> --->  Updating database of binaries
>> --->  Updating database of C++ stdlib usage
>> --->  Scanning binaries for linking errors
>> Warning: Error parsing file /opt/local/bin/sndfile-cmp: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-concat: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-convert: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-deinterleave: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-info: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-interleave: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-metadata-get: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-metadata-set: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-play: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/sndfile-salvage: Error mapping file into memory
>> Warning: Error parsing file /opt/local/lib/libsndfile.1.dylib: Error mapping file into memory
>> Warning: Error parsing file /Applications/MacPorts/mpv.app/Contents/MacOS/mpv: Error mapping file into memory
>> Warning: Error parsing file /opt/local/bin/mpv: Error mapping file into memory
>> --->  No broken files found.
>> --->  No broken ports found.
> 
> 	Does anyone know what might trigger these? It's the first time I've ever seen that warning, and there haven't been any system or xcode updates since the last successful installs/updates. I can't seem to find much info searching, and I haven't ever seen it on any other system running 10.13 or any previous version either. I plan to play around with it more tonight but if there is anything obvious I'm missing that could point me in a direction to start I'd appreciate it!

Well, "Error mapping file into memory" is the human-readable form of
MACHO_EMMAP, which is only returned in one place:

<https://github.com/macports/macports-base/blob/master/src/machista1.0/libmachista.c#L477>

So all we know is that the underlying mmap call failed for some reason
(unfortunately mmap doesn't give a specific reason for its failures).

- Josh