(
c-addr u fam --
fileid ior )
Open the file named in the character string specified by
c-addr u, with file access method indicated by
fam. The meaning of values of
fam is
implementation defined.
If the file is successfully opened,
ior is zero,
fileid is its identifier, and the file has been
positioned to the start of the file.
Otherwise,
ior is the implementation-defined I/O
result code and
fileid is undefined.