.. index:: os .. _os/0:

.. rst-class:: right

object

os

Portable operating-system access predicates.

| Availability: | logtalk_load(os(loader))

| Author: Paulo Moura | Version: 1:100:2 | Date: 2024-03-25

| Compilation flags: | static, context_switching_calls

| Implements: | public :ref:`osp <osp/0>` | Uses: | :ref:`list <list/0>` | Aliases: | osp absolute_file_name/2 as expand_path/2

| Remarks:

• File path expansion: To ensure portability, all file paths are expanded before being handed to the backend Prolog system.
• Exception terms: Currently, there is no standardization of the exception terms thrown by the different backend Prolog systems.
• B-Prolog portability: The wall_time/1 predicate is not supported.
• CxProlog portability: The date_time/7 predicate returns zeros for all arguments.
• JIProlog portability: The file_permission/2 and command_line_arguments/1 predicates are not supported.
• Quintus Prolog: The pid/1 and shell/2 predicates are not supported.
• XSB portability: The command_line_arguments/1 predicate is not supported.

| Inherited public predicates: |  :ref:osp/0::absolute_file_name/2  :ref:osp/0::change_directory/1  :ref:osp/0::command_line_arguments/1  :ref:osp/0::copy_file/2  :ref:osp/0::cpu_time/1  :ref:osp/0::date_time/7  :ref:osp/0::decompose_file_name/3  :ref:osp/0::decompose_file_name/4  :ref:osp/0::delete_directory/1  :ref:osp/0::delete_file/1  :ref:osp/0::directory_exists/1  :ref:osp/0::directory_files/2  :ref:osp/0::directory_files/3  :ref:osp/0::ensure_directory/1  :ref:osp/0::ensure_file/1  :ref:osp/0::environment_variable/2  :ref:osp/0::file_exists/1  :ref:osp/0::file_modification_time/2  :ref:osp/0::file_permission/2  :ref:osp/0::file_size/2  :ref:osp/0::full_device_path/1  :ref:osp/0::internal_os_path/2  :ref:osp/0::is_absolute_file_name/1  :ref:osp/0::make_directory/1  :ref:osp/0::make_directory_path/1  :ref:osp/0::null_device_path/1  :ref:osp/0::operating_system_machine/1  :ref:osp/0::operating_system_name/1  :ref:osp/0::operating_system_release/1  :ref:osp/0::operating_system_type/1  :ref:osp/0::path_concat/3  :ref:osp/0::pid/1  :ref:osp/0::read_only_device_path/1  :ref:osp/0::rename_file/2  :ref:osp/0::shell/1  :ref:osp/0::shell/2  :ref:osp/0::sleep/1  :ref:osp/0::temporary_directory/1  :ref:osp/0::time_stamp/1  :ref:osp/0::wall_time/1  :ref:osp/0::working_directory/1  

.. contents:: :local: :backlinks: top

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)

.. seealso::

:ref:`os_types <os_types/0>`