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yap-6.3/library/system.yap
vsc 95a113aac9 trail_ref cleanup 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@64 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2001-06-08 14:52:54 +00:00

396 lines
11 KiB
Prolog
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v/*************************************************************************
* *
* 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(system, [
chmod/2,
datime/1,
delete_file/1,
delete_file/2,
directory_files/2,
environ/2,
exec/3,
file_exists/1,
file_exists/2,
file_property/2,
fmode/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/1,
system/2,
time/1,
tmpnam/1,
wait/2,
working_directory/2
]).
:- use_module(library(lists), [append/3]).
:- load_foreign_files([sys], [], init_sys).
% time builtins
datime(X) :-
datime(X, Error),
handle_system_error(Error, off, datime(X)).
% file operations
delete_file(File) :-
delete_file(File, off, on, off).
delete_file(File, Opts) :-
process_delete_file_opts(Opts, Dir, Recurse, Ignore, delete_file(File,Opts)),
delete_file(File, Dir, Recurse, Ignore).
process_delete_file_opts(V, _, _, _, T) :- var(V), !,
throw(error(instantiation_error,T)).
process_delete_file_opts([], off, off, off, _) :- !.
process_delete_file_opts([V|_], _, _, _, T) :- var(V), !,
throw(error(instantiation_error,T)).
process_delete_file_opts([directory|Opts], on, Recurse, Ignore, T) :- !,
process_delete_file_opts(Opts, _, Recurse, Ignore, T).
process_delete_file_opts([recursive|Opts], Dir, on, Ignore, T) :- !,
process_delete_file_opts(Opts, Dir, _, Ignore, T).
process_delete_file_opts([ignore|Opts], Dir, Recurse, on, T) :- !,
process_delete_file_opts(Opts, Dir, Recurse, _, T).
process_delete_file_opts(Opts, _, _, _, T) :-
throw(error(domain_error(delete_file_option,Opts),T)).
delete_file(File, Dir, Recurse, Ignore) :-
file_property(File, Type, _, _, _Permissions, Ignore),
delete_file(Type, File, Dir, Recurse, Ignore).
delete_file(N, File, _Dir, _Recurse, Ignore) :- number(N), !, % error.
handle_system_error(N, Ignore, delete_file(File)).
delete_file(directory, File, Dir, Recurse, Ignore) :-
delete_directory(Dir, File, Recurse, Ignore).
delete_file(_, File, _Dir, _Recurse, Ignore) :-
unlink_file(File, Ignore).
unlink_file(File, Ignore) :-
unlink(File, N),
handle_system_error(N, Ignore, delete_file(File)).
delete_directory(on, File, _Recurse, Ignore) :-
rm_directory(File, Ignore).
delete_directory(off, File, Recurse, Ignore) :-
delete_directory(Recurse, File, Ignore).
rm_directory(File, Ignore) :-
rmdir(File, Error),
handle_system_error(Error, Ignore, delete_file(File)).
delete_directory(on, File, Ignore) :-
directory_files(File, FileList, Ignore),
dir_separator(D),
atom_concat(File, D, FileP),
delete_dirfiles(FileList, FileP, Ignore),
rmdir(File, Ignore).
delete_dirfiles([], _, _).
delete_dirfiles(['.'|Fs], File, Ignore) :- !,
delete_dirfiles(Fs, File, Ignore).
delete_dirfiles(['..'|Fs], File, Ignore) :- !,
delete_dirfiles(Fs, File, Ignore).
delete_dirfiles([F|Fs], File, Ignore) :-
atom_concat(File,F,TrueF),
delete_file(TrueF, off, on, Ignore),
delete_dirfiles(Fs, File, Ignore).
directory_files(File, FileList) :-
directory_files(File, FileList, off).
directory_files(File, FileList, Ignore) :-
list_directory(File, FileList, Error),
handle_system_error(Error, Ignore, directory_files(File, FileList)).
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(File, type(Type)) :-
file_property(File, Type, _Size, _Date).
file_property(File, size(Size)) :-
file_property(File, _Type, Size, _Date).
file_property(File, mod_time(Date)) :-
file_property(File, _Type, _Size, Date).
file_property(File, Type, Size, Date) :-
file_property(File, Type, Size, Date, _Permissions, Error),
handle_system_error(Error, off, file_property(File)).
file_exists(File) :-
file_property(File, _Type, _Size, _Date, _Permissions, Error),
var(Error).
file_exists(File, Permissions) :-
file_property(File, _Type, _Size, _Date, FPermissions, Error),
var(Error),
process_permissions(Permissions, Perms),
FPermissions /\ Perms =:= Perms.
process_permissions(Number, Number) :- integer(Number).
make_directory(Dir) :-
var(Dir), !,
throw(error(instantiation_error,mkdir(Dir))).
make_directory(Dir) :-
atom(Dir), !,
mkdir(Dir,Error),
handle_system_error(Error, off, mkdir(Dir)).
make_directory(Dir) :-
throw(error(type_error(atom,Dir),make_directory(Dir))).
rename_file(Old, New) :-
atom(Old), atom(New), !,
rename_file(Old, New, Error),
handle_system_error(Error, off, rename_file(Old, New)).
rename_file(X,Y) :- (var(X) ; var(Y)), !,
throw(error(instantiation_error,rename_file(X,Y))).
rename_file(X,Y) :- atom(X), !,
throw(error(type_error(atom,Y),rename_file(X,Y))).
rename_file(X,Y) :-
throw(error(type_error(atom,X),rename_file(X,Y))).
%
% 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(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(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).
working_directory(OLD, NEW) :-
getcwd(OLD),
cd(NEW).
%
% process execution
%
exec(Command, [StdIn, StdOut, StdErr], PID) :-
G = exec(Command, [StdIn, StdOut, StdErr], PID),
check_command(Command, G),
process_inp_stream_for_exec(StdIn, In, G),
process_out_stream_for_exec(StdOut, Out, G),
process_err_stream_for_exec(StdErr, Err, G),
( exec_command(Command, In, Out, Err, PID, Error) -> true ; true ),
close_temp_streams(StdIn, In, StdOut, Out, StdErr, Err),
handle_system_error(Error, off, G).
process_inp_stream_for_exec(Error, _, G) :- var(Error), !,
throw(error(instantiation_error,G)).
process_inp_stream_for_exec(null, 0, _) :- !.
process_inp_stream_for_exec(std, '$stream'(0), _) :- !.
process_inp_stream_for_exec(pipe(SOut), SInp, _) :- !,
open_pipe_streams(SInp, SOut).
process_inp_stream_for_exec(Stream, Stream, _) :-
stream_property(Stream, input).
process_out_stream_for_exec(Error, _, G) :- var(Error), !,
throw(error(instantiation_error,G)).
process_out_stream_for_exec(null, 0, _) :- !.
process_out_stream_for_exec(std, '$stream'(1), _) :- !.
process_out_stream_for_exec(pipe(SInp), SOut, _) :- !,
open_pipe_streams(SInp, SOut).
process_out_stream_for_exec(Stream, Stream, _) :-
stream_property(Stream, output).
process_err_stream_for_exec(Error, _, G) :- var(Error), !,
throw(error(instantiation_error,G)).
process_err_stream_for_exec(null, 0, _) :- !.
process_err_stream_for_exec(std, '$stream'(2), _) :- !.
process_err_stream_for_exec(pipe(SInp), SOut, _) :- !,
open_pipe_streams(SInp, SOut).
process_err_stream_for_exec(Stream, Stream, _) :-
stream_property(Stream, output).
close_temp_streams(pipe(_), S, _, _, _, _) :- close(S), fail.
close_temp_streams(_, _, pipe(_), S, _, _) :- close(S), fail.
close_temp_streams(_, _, _, _, pipe(_), S) :- close(S), fail.
close_temp_streams(_, _, _, _, _, _).
popen(Command, Mode, Stream) :-
G = popen(Command, Mode, Stream),
check_command(Command, G),
check_mode(Mode, M, G),
popen(Command, M, Stream, Result),
handle_system_error(Result, off, G).
check_command(Com, G) :- var(Com), !,
throw(error(instantiation_error,G)).
check_command(Com, _) :- atom(Com), !.
check_command(Com, G) :-
throw(type_error(atom,Com),G).
check_mode(Mode, _, G) :- var(Mode), !,
throw(error(instantiation_error,G)).
check_mode(read, 0, _) :- !.
check_mode(write,1, _) :- !.
check_mode(Mode, G) :-
throw(domain_error(io_mode,Mode),G).
shell :-
G = shell,
get_shell0(FullCommand),
exec_command(FullCommand, '$stream'(0),'$stream'(1), '$stream'(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),
atom_codes(Command, SC),
append(Shell, SC, ShellCommand),
atom_codes(FullCommand, ShellCommand),
exec_command(FullCommand, '$stream'(0),'$stream'(1), '$stream'(2), PID, Error),
handle_system_error(Error, off, G),
wait(PID, _Status, Error),
handle_system_error(Error, off, G).
shell(Command, Status) :-
G = shell(Command, Status),
check_command(Command, G),
get_shell(Shell),
atom_codes(Command, SC),
append(Shell, SC, ShellCommand),
atom_codes(FullCommand, ShellCommand),
exec_command(FullCommand, '$stream'(0),'$stream'(1), '$stream'(2), PID, Error),
handle_system_error(Error, off, G),
wait(PID, Status,Error),
handle_system_error(Error, off, G).
get_shell0(Shell) :-
getenv('SHELL', Shell), !.
get_shell0(Shell) :-
win,
getenv('COMSPEC', Shell0).
get_shell(Shell) :-
getenv('SHELL', Shell0), !,
atom_codes(Shell0, Codes),
append(Codes," -c ", Shell).
get_shell(Shell) :-
win,
getenv('COMPSEC', Shell0),
atom_codes(Shell0, Codes),
append(Codes," /c ", Shell).
system(Command, Status) :-
G = system(Command, Status),
check_command(Command, G),
do_system(Command, Status).
sleep(Interval) :- var(Interval), !,
throw(error(instantiation_error,sleep(Interval))).
sleep(Interval) :- number(Interval), !,
( Interval =< 0 ->
throw(error(domain_error(not_less_than_zero,Interval),
sleep(Interval)))
;
sleep(Interval, _Remainder)
).
sleep(Interval) :-
throw(error(type_error(number,Interval),sleep(Interval))).
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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