user:file_search_path/2 is undefined at startup, but behaves as
if it were a multifile predicate with the following clauses. See
ref-lps-flg for more info on the Prolog flag host_type.
The environment variables SP_APP_DIR and SP_RT_DIR expand
respectively to the absolute path of the directory that contains the
executable and the directory that contains the SICStus run-time. The
environment variable SP_TEMP_DIR expands to a directory suitable
for storing temporary files, it is particularly useful with the
open/4 option if_exists(generate_unique_name).
file_search_path(library, Path) :-
library_directory(Path).
file_search_path(system, Platform) :-
prolog_flag(host_type, Platform).
file_search_path(application, '$SP_APP_DIR').
file_search_path(runtime, '$SP_RT_DIR').
file_search_path(temp, '$SP_TEMP_DIR').
file_search_path(path, Path) :-
%% enumerate all directories in $PATH
...
user:library_directory/1 is undefined at startup, but behaves as
if it were a multifile predicate with a single clause defining the
location of the Prolog library. The initial value is the same as the
value of the environment variable SP_LIBRARY_DIR. The
predicate may succeed nondeterminately in this search for a
library directory.