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yap-6.3/library/system.yap

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: system.yap *
* Last rev: *
* mods: *
* comments: Operating System Access built-ins *
* *
*************************************************************************/
:- module(operating_system_support, [
datime/1,
delete_file/1,
delete_file/2,
directory_files/2,
environ/2,
exec/3,
file_exists/1,
file_exists/2,
file_property/2,
host_id/1,
host_name/1,
pid/1,
kill/2,
mktemp/2,
make_directory/1,
popen/3,
rename_file/2,
shell/0,
shell/1,
shell/2,
sleep/1,
system/0,
system/1,
system/2,
mktime/2,
tmpnam/1,
tmp_file/2,
tmpdir/1,
wait/2,
working_directory/2
]).
:- use_module(library(lists), [append/3]).
:- load_foreign_files([sys], [], init_sys).
:- dynamic tmp_file_sequence_counter/1.
% time builtins
datime(X) :-
datime(X, Error),
handle_system_error(Error, off, datime(X)).
mktime(V, A) :- var(V), !,
throw(error(instantiation_error,mktime(V,A))).
mktime(In,Out) :-
check_mktime_inp(In, mktime(In,Out)),
In = datime(Y,Mo,D,H,Mi,S),
mktime(Y, Mo, D, H, Mi, S, Out, Error),
handle_system_error(Error, off, mktime(In,Out)).
check_mktime_inp(V, Inp) :- var(V), !,
throw(error(instantiation_error,Inp)).
check_mktime_inp(datime(Y,Mo,D,H,Mi,S), Inp) :- !,
check_int(Y, Inp),
check_int(Mo, Inp),
check_int(D, Inp),
check_int(H, Inp),
check_int(Mi, Inp),
check_int(S, Inp).
check_mktime_inp(T, Inp) :-
throw(error(domain_error(mktime,T),Inp)).
check_int(I, _) :- integer(I), !.
check_int(I, Inp) :- var(I),
throw(error(instantiation_error,Inp)).
check_int(I, Inp) :-
throw(error(type_error(integer,I),Inp)).
% file operations
handle_system_error(Error, _Ignore, _G) :- var(Error), !.
handle_system_error(Error, off, G) :- atom(Error), !,
throw(error(system_error(Error),G)).
handle_system_error(Error, off, G) :-
error_message(Error, Message),
throw(error(system_error(Message),G)).
file_property(IFile, type(Type)) :-
true_file_name(IFile, File),
file_property(File, Type, _Size, _Date, _Permissions, _LinkName).
file_property(IFile, size(Size)) :-
true_file_name(IFile, File),
file_property(File, _Type, Size, _Date, _Permissions, _LinkName).
file_property(IFile, mod_time(Date)) :-
true_file_name(IFile, File),
file_property(File, _Type, _Size, Date, _Permissions, _LinkName).
file_property(IFile, mode(Permissions)) :-
true_file_name(IFile, File),
file_property(File, _Type, _Size, _Date, Permissions, _LinkName).
file_property(IFile, linkto(LinkName)) :-
true_file_name(IFile, File),
file_property(File, _Type, _Size, _Date, _Permissions, LinkName),
atom(LinkName).
file_property(File, Type, Size, Date, Permissions, LinkName) :-
file_property(File, Type, Size, Date, Permissions, LinkName, Error),
handle_system_error(Error, off, file_property(File)).
file_exists(File) :-
var(File), !,
throw(error(instantiation_error,file_exists(File))).
file_exists(File) :-
\+ atom(File), !,
throw(error(type_error(atom,File),file_exists(File))).
file_exists(IFile) :-
true_file_name(IFile, File),
file_property(File, _Type, _Size, _Date, _Permissions, _, Error),
var(Error).
file_exists(File, Permissions) :-
var(File), !,
throw(error(instantiation_error,file_exists(File, Permissions))).
file_exists(File, Permissions) :-
\+ atom(File), !,
throw(error(type_error(atom,File),file_exists(File, Permissions))).
file_exists(IFile, Permissions) :-
true_file_name(IFile, File),
file_property(File, _Type, _Size, _Date, FPermissions, _, Error),
var(Error),
process_permissions(Permissions, Perms),
FPermissions /\ Perms =:= Perms.
process_permissions(Number, Number) :- integer(Number).
%
% environment manipulation.
%
environ(Na,Val) :- var(Na), !,
environ_enum(0,I),
( p_environ(I,S) -> environ_split(S,SNa,SVal) ; !, fail ),
atom_codes(Na, SNa),
atom_codes(Val, SVal).
environ(Na,Val) :- atom(Na), !,
bound_environ(Na, Val).
environ(Na,Val) :-
throw(error(type_error(atom,Na),environ(Na,Val))).
bound_environ(Na, Val) :- var(Val), !,
getenv(Na,Val).
bound_environ(Na, Val) :- atom(Val), !,
putenv(Na,Val).
bound_environ(Na, Val) :-
throw(error(type_error(atom,Val),environ(Na,Val))).
environ_enum(X,X).
environ_enum(X,X1) :-
Xi is X+1,
environ_enum(Xi,X1).
environ_split([61|SVal], [], SVal) :- !.
environ_split([C|S],[C|SNa],SVal) :-
environ_split(S,SNa,SVal).
%
% process execution
%
exec(Command, [StdIn, StdOut, StdErr], PID) :-
G = exec(Command, [StdIn, StdOut, StdErr], PID),
check_command_with_default_shell(Command, TrueCommand, G),
process_inp_stream_for_exec(StdIn, In, G, [], L1),
process_out_stream_for_exec(StdOut, Out, G, L1, L2),
process_err_stream_for_exec(StdErr, Err, G, L2, L3),
( exec_command(TrueCommand, In, Out, Err, PID, Error) -> true ; true ),
close_temp_streams(L3),
handle_system_error(Error, off, G).
process_inp_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
close_temp_streams(L),
throw(error(instantiation_error,G)).
process_inp_stream_for_exec(null, null, _, L, L) :- !.
process_inp_stream_for_exec(std, 0, _, L, L) :- !.
process_inp_stream_for_exec(pipe(ForWriting), ForReading, _, L, [ForReading|L]) :- var(ForWriting), !,
open_pipe_streams(ForReading, ForWriting).
process_inp_stream_for_exec(pipe(Stream), _, _, L, L) :- !,
stream_property(Stream, output).
process_inp_stream_for_exec(Stream, Stream, _, L, L) :-
stream_property(Stream, output).
process_out_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
close_temp_streams(L),
throw(error(instantiation_error,G)).
process_out_stream_for_exec(null, null, _, L, L) :- !.
process_out_stream_for_exec(std, 1, _, L, L) :- !.
process_out_stream_for_exec(pipe(ForReading), ForWriting, _, L, [ForWriting|L]) :- var(ForReading), !,
open_pipe_streams(ForReading, ForWriting).
process_out_stream_for_exec(pipe(Stream), _, _, L, L) :- !,
stream_property(Stream, input).
process_out_stream_for_exec(Stream, Stream, _, L, L) :-
stream_property(Stream, input).
process_err_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
close_temp_streams(L),
throw(error(instantiation_error,G)).
process_err_stream_for_exec(null, null, _, L, L) :- !.
process_err_stream_for_exec(std, 2, _, L, L) :- !.
process_err_stream_for_exec(pipe(ForReading), ForWriting, _, L, [ForWriting|L]) :- var(ForReading), !,
open_pipe_streams(ForReading, ForWriting).
process_err_stream_for_exec(pipe(Stream), Stream, _, L, L) :- !,
stream_property(Stream, input).
process_err_stream_for_exec(Stream, Stream, _, L, L) :-
stream_property(Stream, input).
close_temp_streams([]).
close_temp_streams([S|Ss]) :- close(S),
close_temp_streams(Ss).
popen(Command, Mode, Stream) :-
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open(pipe(Command), Mode, Stream).
check_command_with_default_shell(Com, ComF, G) :-
check_command(Com, G),
os_command_postprocess(Com, ComF).
%
% make sure that Windows executes the command from $COMSPEC.
%
os_command_postprocess(Com, ComF) :- win, !,
atom_codes(Com, SC),
append(" /c ", SC, SC1),
getenv('COMSPEC', Shell0),
atom_codes(Shell0, Codes),
append(Codes, SC1, SCF),
atom_codes(ComF, SCF).
os_command_postprocess(Com, Com).
check_command(Com, G) :- var(Com), !,
throw(error(instantiation_error,G)).
check_command(Com, _) :- atom(Com), !.
check_command(Com, G) :-
throw(error(type_error(atom,Com),G)).
check_mode(Mode, _, G) :- var(Mode), !,
throw(error(instantiation_error,G)).
check_mode(read, 0, _) :- !.
check_mode(write,1, _) :- !.
check_mode(Mode, G) :-
throw(error(domain_error(io_mode,Mode),G)).
shell :-
G = shell,
get_shell0(FullCommand),
exec_command(FullCommand, 0, 1, 2, PID, Error),
handle_system_error(Error, off, G),
wait(PID, _Status, Error),
handle_system_error(Error, off, G).
shell(Command) :-
G = shell(Command),
check_command(Command, G),
get_shell(Shell,Opt),
do_shell(Shell, Opt, Command, Status, Error),
Status = 0,
handle_system_error(Error, off, G).
shell(Command, Status) :-
G = shell(Command, Status),
check_command(Command, G),
get_shell(Shell,Opt),
do_shell(Shell, Opt, Command, Status, Error),
handle_system_error(Error, off, G).
protect_command([], [0'"]). % "
protect_command([H|L], [H|NL]) :-
protect_command(L, NL).
get_shell0(Shell) :-
getenv('SHELL', Shell), !.
get_shell0(Shell) :-
win, !,
getenv('COMSPEC', Shell).
get_shell0('/bin/sh').
get_shell(Shell, '-c') :-
getenv('SHELL', Shell), !.
get_shell(Shell, '/c') :-
win, !,
getenv('COMSPEC', Shell).
get_shell('/bin/sh','-c').
system :-
default_shell(Command),
do_system(Command, _Status, Error),
handle_system_error(Error, off, system).
default_shell(Shell) :- win, !,
getenv('COMSPEC', Shell).
default_shell('/bin/sh').
system(Command, Status) :-
G = system(Command, Status),
check_command(Command, G),
do_system(Command, Status, Error),
Status = 0,
handle_system_error(Error, off, G).
wait(PID,STATUS) :- var(PID), !,
throw(error(instantiation_error,wait(PID,STATUS))).
wait(PID,STATUS) :- integer(PID), !,
wait(PID, STATUS, Error),
handle_system_error(Error, off, wait(PID,STATUS)).
wait(PID,STATUS) :-
throw(error(type_error(integer,PID),wait(PID,STATUS))).
%
% host info
%
host_name(X) :-
host_name(X, Error),
handle_system_error(Error, off, host_name(X)).
host_id(X) :-
host_id(X0, Error),
handle_system_error(Error, off, host_id(X)),
number_codes(X0, S),
atom_codes(X, S).
pid(X) :-
pid(X, Error),
handle_system_error(Error, off, pid(X)).
kill(X,Y) :-
integer(X), integer(Y), !,
kill(X, Y, Error),
handle_system_error(Error, off, kill(X,Y)).
kill(X,Y) :- (var(X) ; var(Y)), !,
throw(error(instantiation_error,kill(X,Y))).
kill(X,Y) :- integer(X), !,
throw(error(type_error(integer,Y),kill(X,Y))).
kill(X,Y) :-
throw(error(type_error(integer,X),kill(X,Y))).
mktemp(X,Y) :- var(X), !,
throw(error(instantiation_error,mktemp(X,Y))).
mktemp(X,Y) :-
atom(X), !,
mktemp(X, Y, Error),
handle_system_error(Error, off, mktemp(X,Y)).
mktemp(X,Y) :-
throw(error(type_error(atom,X),mktemp(X,Y))).
tmpnam(X) :-
tmpnam(X, Error),
handle_system_error(Error, off, tmpnam(X)).
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%%% Added from Theo, path_seperator is used to replace the c predicate dir_separator which is not OS aware
tmpdir(TmpDir):-
tmpdir(Dir, Error),
handle_system_error(Error, off, tmpdir(Dir)),
path_separator(D),
(atom_concat(_, D, Dir) ->
TmpDir = Dir
;
atom_concat(Dir, D, TmpDir)
).
path_separator('\\'):-
win, !.
path_separator('/').