- swipl
- library
- error.pl
- apply.pl
- lists.pl -- List Manipulation
- debug.pl
- broadcast.pl -- Event service
- socket.pl -- Network socket (TCP and UDP) library
- predicate_options.pl -- Access and analyse predicate options
- shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
- option.pl
- uid.pl -- User and group management on Unix systems
- unix.pl -- Unix specific operations
- syslog.pl -- Unix syslog interface
- thread_pool.pl
- gensym.pl -- Generate unique symbols
- settings.pl -- Setting management
- arithmetic.pl -- Extensible arithmetic
- main.pl -- Provide entry point for scripts
- readutil.pl
- ssl.pl -- Secure Socket Layer (SSL) library
- crypto.pl -- Cryptography and authentication library
- filesex.pl
- doc_http.pl -- Documentation server
- pldoc.pl -- Process source documentation
- operators.pl -- Manage operators
- pairs.pl -- Operations on key-value lists
- prolog_source.pl -- Examine Prolog source-files
- sgml.pl -- SGML, XML and HTML parser
- quasi_quotations.pl -- Define Quasi Quotation syntax
- uri.pl -- Process URIs
- url.pl -- Analysing and constructing URL
- www_browser.pl -- Open a URL in the users browser
- prolog_colour.pl -- Prolog syntax colouring support.
- record.pl -- Access compound arguments by name
- prolog_xref.pl -- Prolog cross-referencer data collection
- occurs.pl -- Finding and counting sub-terms
- ordsets.pl -- Ordered set manipulation
- assoc.pl -- Binary associations
- ugraphs.pl -- Graph manipulation library
- xpath.pl -- Select nodes in an XML DOM
- iostream.pl -- Utilities to deal with streams
- atom.pl -- Operations on atoms
- porter_stem.pl
- solution_sequences.pl -- Modify solution sequences
- prolog_pack.pl -- A package manager for Prolog
- prolog_config.pl -- Provide configuration information
- process.pl -- Create processes and redirect I/O
- git.pl -- Run GIT commands
- ctypes.pl -- Character code classification
- time.pl -- Time and alarm library
- utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
- base64.pl -- Base64 encoding and decoding
- sha.pl -- SHA secure hashes
- crypt.pl
- persistency.pl -- Provide persistent dynamic predicates
- memfile.pl
- pure_input.pl -- Pure Input from files and streams
- nb_set.pl -- Non-backtrackable sets
- xsdp_types.pl -- XML-Schema primitive types
- uuid.pl -- Universally Unique Identifier (UUID) Library
- pcre.pl -- Perl compatible regular expression matching for SWI-Prolog
- aggregate.pl -- Aggregation operators on backtrackable predicates
- rdf_write.pl -- Write RDF/XML from a list of triples
- rdf.pl -- RDF/XML parser
- sgml_write.pl -- XML/SGML writer module
- archive.pl -- Access several archive formats
- csv.pl -- Process CSV (Comma-Separated Values) data
- dialect.pl -- Support multiple Prolog dialects
- apply_macros.pl -- Goal expansion rules to avoid meta-calling
- prolog_code.pl -- Utilities for reasoning about code
- dif.pl -- The dif/2 constraint
- thread.pl -- High level thread primitives
- rdf_triple.pl -- Create triples from intermediate representation
- rdf_parser.pl
- rewrite_term.pl
- rbtrees.pl -- Red black trees
- nb_rbtrees.pl -- Non-backtrackable operations on red black trees
- pengines.pl -- Pengines: Web Logic Programming Made Easy
- yall.pl -- Lambda expressions
- sandbox.pl -- Sandboxed Prolog code
- prolog_format.pl -- Analyse format specifications
- random.pl -- Random numbers
- pengines_io.pl -- Provide Prolog I/O for HTML clients
- zlib.pl -- Zlib wrapper for SWI-Prolog
- bdb.pl -- Berkeley DB interface
- hash_stream.pl -- Maintain a hash on a stream
- md5.pl -- MD5 hashes
- pprint.pl -- Pretty Print Prolog terms
- modules.pl -- Module utility predicates
- lazy_lists.pl -- Lazy list handling
- edinburgh.pl -- Some traditional Edinburgh predicates
- prolog_clause.pl -- Get detailed source-information about a clause
- prolog_breakpoints.pl -- Manage Prolog break-points
- dicts.pl -- Dict utilities
- system.pl -- System utilities
- quintus.pl -- Quintus compatibility
- redis.pl -- Redis client
- terms.pl -- Term manipulation
- jpl.pl -- A Java interface for SWI Prolog 7.x
- intercept.pl -- Intercept and signal interface
- prolog_history.pl -- Per-directory persistent commandline history
- prolog_stack.pl -- Examine the Prolog stack
- codesio.pl -- I/O on Lists of Character Codes
- heaps.pl -- heaps/priority queues
- backcomp.pl -- Backward compatibility
- date.pl -- Process dates and times
- prolog_debug.pl -- User level debugging tools
- prolog_profile.pl -- Execution profiler
- listing.pl -- List programs and pretty print clauses
- snowball.pl -- The Snowball multi-lingual stemmer library
- unicode.pl -- Unicode string handling
- stomp.pl -- STOMP client.
- increval.pl -- Incremental dynamic predicate modification
- tables.pl -- XSB interface to tables
- plunit.pl -- Unit Testing
- ansi_term.pl -- Print decorated text to ANSI consoles
- strings.pl -- String utilities
- base32.pl -- Base32 encoding and decoding
- c14n2.pl -- C14n2 canonical XML documents
- cgi.pl -- Read CGI parameters
- doc_files.pl -- Create stand-alone documentation files
- editline.pl -- BSD libedit based command line editing
- explain.pl -- Describe Prolog Terms
- files.pl
- help.pl -- Text based manual
- isub.pl -- isub: a string similarity measure
- doc_latex.pl -- PlDoc LaTeX backend
- mqi.pl
- optparse.pl -- command line parsing
- term_to_json.pl
- make.pl -- Reload modified source files
- odbc.pl
- oset.pl -- Ordered set manipulation
- paxos.pl -- A Replicated Data Store
- pdt_console.pl
- prolog_trace.pl -- Print access to predicates
- prolog_wrap.pl -- Wrapping predicates
- protobufs.pl -- Google's Protocol Buffers ("protobufs")
- wfs.pl -- Well Founded Semantics interface
- charsio.pl -- I/O on Lists of Character Codes
- coinduction.pl -- Co-Logic Programming
- sort.pl
- statistics.pl -- Get information about resource usage
- varnumbers.pl -- Utilities for numbered terms
- when.pl -- Conditional coroutining
- redis_streams.pl -- Using Redis streams
- xmldsig.pl -- XML Digital signature
- xmlenc.pl -- XML encryption library
- edit.pl -- Editor interface
- threadutil.pl -- Interactive thread utilities
- prolog_codewalk.pl -- Prolog code walker
- prolog_metainference.pl -- Infer meta-predicate properties
- double_metaphone.pl -- Phonetic string matching
- hashtable.pl -- Hash tables
- check.pl -- Consistency checking
- udp_broadcast.pl -- A UDP broadcast proxy
- qsave.pl -- Save current program as a state or executable
- zip.pl -- Access resource ZIP archives
- prolog_autoload.pl -- Autoload all dependencies
- table.pl
- writef.pl -- Old-style formatted write
- streampool.pl -- Input multiplexing
- pwp.pl -- Prolog Well-formed Pages
- rlimit.pl
- yaml.pl -- Process YAML data
- prolog_stream.pl -- A stream with Prolog callbacks
- shell.pl -- Elementary shell commands
- readline.pl -- GNU readline interface
- portray_text.pl -- Portray text
- fastrw.pl -- Fast reading and writing of terms
- prolog_jiti.pl -- Just In Time Indexing (JITI) utilities
- win_menu.pl -- Console window menu
- tty.pl -- Terminal operations
- test_cover.pl -- Clause coverage analysis
- streams.pl -- Manage Prolog streams
- janus.pl -- Call Python from Prolog
- rwlocks.pl -- Read/write locks
- macros.pl -- Macro expansion
- library
- process_create(+Exe, +Args:list, +Options) is det
- Create a new process running the file Exe and using arguments
from the given list. Exe is a file specification as handed to
absolute_file_name/3. Typically one use the
path
file alias to specify an executable file on the current PATH. Args is a list of arguments that are handed to the new process. On Unix systems, each element in the list becomes a separate argument in the new process. In Windows, the arguments are simply concatenated to form the commandline. Each argument itself is either a primitive or a list of primitives. A primitive is either atomic or a termfile(Spec)
. Usingfile(Spec)
, the system inserts a filename using the OS filename conventions which is properly quoted if needed.Options:
- stdin(Spec)
- stdout(Spec)
- stderr(Spec)
- Bind the standard streams of the new process. Spec is one of
the terms below. If
pipe(Pipe)
is used, the Prolog stream is a stream in text-mode using the encoding of the default locale. The encoding can be changed using set_stream/2, or by using the two-argument form ofpipe
, which accepts anencoding(Encoding)
option. The optionsstdout
andstderr
may use the same stream, in which case both output streams are connected to the same Prolog stream.- std
- Just share with the Prolog I/O streams. On Unix,
if the
user_input
, etc. are bound to a file handle but not to 0,1,2 the process I/O is bound to the file handles of these streams. - null
- Bind to a null stream. Reading from such a stream returns end-of-file, writing produces no output
- pipe(-Stream)
- pipe(-Stream, +StreamOptions)
- Attach input and/or output to a Prolog stream.
The optional StreamOptions argument is a list of options
that affect the stream. Currently only the options
type(+Type)
andencoding(+Encoding)
are supported, which have the same meaning as the stream properties of the same name (see stream_property/2). StreamOptions is provided mainly for SICStus compatibility - the SWI-Prolog predicate set_stream/2 can be used for the same purpose. - stream(+Stream)
- Attach input or output to an existing Prolog stream.
This stream must be associated with an OS file
handle (see stream_property/2, property
file_no
). This option is not provided by the SICStus implementation.
- cwd(+Directory)
- Run the new process in Directory. Directory can be a compound specification, which is converted using absolute_file_name/3. See also process_set_method/1.
- env(+List)
- As
environment(List)
, but only the specified variables are passed, i.e., no variables are inherited. - environment(+List)
- Specify additional environment variables for the new process.
List is a list of
Name=Value
terms, where Value is expanded the same way as the Args argument. If neitherenv
norenvironment
is passed the environment is inherited from the Prolog process. At most oneenv(List)
orenvironment(List)
term may appear in the options. If multiple appear apermission_error
is raised for the second option. - process(-PID)
- Unify PID with the process id of the created process.
- detached(+Bool)
- In Unix: If
true
, detach the process from the terminal Currently mapped tosetsid()
; Also creates a new process group for the child In Windows: Iftrue
, detach the process from the current job via the CREATE_BREAKAWAY_FROM_JOB flag. In Vista and beyond, processes launched from the shell directly have the 'compatibility assistant' attached to them automatically unless they have a UAC manifest embedded in them. This means that you will get a permission denied error if you try and assign the newly-created PID to a job you create yourself. - window(+Bool)
- If
true
, create a window for the process (Windows only) - priority(+Priority)
- In Unix: specifies the process priority for the newly created process. Priority must be an integer between -20 and 19. Positive values are nicer to others, and negative values are less so. The default is zero. Users are free to lower their own priority. Only the super-user may raise it to less-than zero.
If the user specifies the
process(-PID)
option, he must call process_wait/2 to reclaim the process. Without this option, the system will wait for completion of the process after the last pipe stream is closed.If the process is not waited for, it must succeed with status 0. If not, an process_error is raised.
Windows notes
On Windows this call is an interface to the CreateProcess() API. The commandline consists of the basename of Exe and the arguments formed from Args. Arguments are separated by a single space. If all characters satisfy
iswalnum()
it is unquoted. If the argument contains a double-quote it is quoted using single quotes. If both single and double quotes appear a domain_error is raised, otherwise double-quote are used.The CreateProcess() API has many options. Currently only the
CREATE_NO_WINDOW
options is supported through thewindow(+Bool)
option. If omitted, the default is to use this option if the application has no console. Future versions are likely to support more window specific options and replace win_exec/2.Examples
First, a very simple example that behaves the same as
shell('ls -l')
, except for error handling:?- process_create(path(ls), ['-l'], []).
The following example uses grep to find all matching lines in a file.
grep(File, Pattern, Lines) :- setup_call_cleanup( process_create(path(grep), [ Pattern, file(File) ], [ stdout(pipe(Out)) ]), read_lines(Out, Lines), close(Out)). read_lines(Out, Lines) :- read_line_to_codes(Out, Line1), read_lines(Line1, Out, Lines). read_lines(end_of_file, _, []) :- !. read_lines(Codes, Out, [Line|Lines]) :- atom_codes(Line, Codes), read_line_to_codes(Out, Line2), read_lines(Line2, Out, Lines).
- Errors
- -
process_error(Exe, Status)
where Status is one ofexit(Code)
orkilled(Signal)
. Raised if the process is waited for (i.e., Options does not includeprocess(-PID)
), and does not exit with status 0. - bug
- - On Windows,
environment(List)
is handled asenv(List)
, i.e., the environment is not inherited.