Certain translators do not need to be very complex, because they represent
a single file rather than an entire directory hierarchy. The trivfs library,
which is declared in <hurd/trivfs.h>, does most of the work of implementing
this kind of translator. This library requires the ?iohelp and
ports libraries.
Using libtrivfs is not the only way to implement such a single-file
translator, but is a convenient abstraction: the library hides a lot of
low-level stuff and you just have to provide a number of call-back functions
and symbols in order to get a functioning (for file I/O, etc.) node in the file
system.