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Article contents:[[tags: manual]] [[toc:]] == Module (chicken platform) This module provides procedures for obtaining information about the platform on which the program is currently running. === Build information These procedures return information about options that can be specified at build time. ==== build-platform <procedure>(build-platform)</procedure> Returns a symbol specifying the toolset which has been used for building the executing system, which is one of the following: cygwin mingw32 gnu intel clang sun unknown ==== chicken-version <procedure>(chicken-version [FULL])</procedure> Returns a string containing the version number of the CHICKEN runtime system. If the optional argument {{FULL}} is given and true, then a full version string is returned. ==== include-path <procedure>(include-path)</procedure> Returns a list of strings representing directory names where included files are located, which defaults to the value of the environment variable {{CHICKEN_INCLUDE_PATH}}, split on {{:}} (or {{;}} on Windows). If the variable is not set, the list is initialized to contain the installation directory (usually {{/usr/local/share/chicken}} on UNIX-like systems). ==== repository-path <parameter>repository-path</parameter> Contains a list of strings naming the paths to the extension repository, which defaults to the value of the environment variable {{CHICKEN_REPOSITORY_PATH}}, split on {{:}} (or {{;}} on Windows). If the environment variable is not set, it will be a list containing the default library path (usually {{/usr/local/lib/chicken}} on UNIX systems). ==== installation-repository <parameter>installation-repository</parameter> Contains the name of the directory where extensions are installed (as opposed to the possible locations where they can be loaded or linked at runtime.) === system-config-directory <procedure>(system-config-directory)</procedure> Returns the location of the directory for configuration files. This obeys the XDG specification, so when the {{XDG_CONFIG_HOME}} environment variable is set, its value is used. When it's not set, it will default to {{$HOME/.config}} on UNIX and {{$APPDATA}} on Windows. === system-cache-directory <procedure>(system-cache-directory)</procedure> Returns the location of the directory for caches. This obeys the XDG specification, so when the {{XDG_CACHE_HOME}} environment variable is set, its value is used. When it's not set, it will default to {{$HOME/.cache}} on UNIX and {{$LOCALAPPDATA}} or {{$APPDATA}} on Windows. === Machine information These procedures return information about the type of CPU/architecture the program is running on. ==== machine-byte-order <procedure>(machine-byte-order)</procedure> Returns the symbol {{little-endian}} or {{big-endian}}, depending on the machine's byte-order. ==== machine-type <procedure>(machine-type)</procedure> Returns a symbol specifying the processor on which this process is currently running, which is one of the following: arm alpha mips hppa ultrasparc sparc ppc ppc64 ia64 x86 x86-64 unknown === Software information These procedures return information about the type of operating system the program is running on. ==== software-type <procedure>(software-type)</procedure> Returns a symbol specifying the operating system on which this process is currently running, which is one of the following: android windows unix ecos unknown ==== software-version <procedure>(software-version)</procedure> Returns a symbol specifying the operating system version on which this process is currently running, which is one of the following: linux freebsd netbsd openbsd macosx hpux dragonfly haiku solaris sunos aix hurd unknown === Feature identifiers CHICKEN maintains a global list of ''features'' naming functionality available in the current system. Additionally the {{cond-expand}} form accesses this feature list to infer what features are provided. Predefined features are {{chicken}}, and the SRFIs (Scheme Request For Implementation) provided by the base system: {{srfi-23, srfi-30, srfi-39}}. If the {{eval}} unit is used (the default), the features {{srfi-0, srfi-2, srfi-6, srfi-8, srfi-9}} and {{srfi-10}} are defined. When compiling code (during compile-time) the feature {{compiling}} is registered. When evaluating code in the interpreter (csi), the feature {{csi}} is registered. ==== features <procedure>(features)</procedure> Returns a list of all registered features that will be accepted as valid feature-identifiers by {{cond-expand}}. ==== feature? <procedure>(feature? ID ...)</procedure> Returns {{#t}} if all features with the given feature-identifiers {{ID ...}} are registered. ==== register-feature! <procedure>(register-feature! FEATURE ...)</procedure> Register one or more features that will be accepted as valid feature-identifiers by {{cond-expand}}. {{FEATURE ...}} may be a keyword, string or symbol. ==== unregister-feature! <procedure>(unregister-feature! FEATURE ...)</procedure> Unregisters the specified feature-identifiers. {{FEATURE ...}} may be a keyword, string or symbol. === Returning to the host program === return-to-host <procedure>(return-to-host)</procedure> Exits the Scheme code and returns to the invoking context that called {{CHICKEN_run}} or {{CHICKEN_continue}}. After {{return-to-host}} has been executed and once {{CHICKEN_run}} returns, you can invoke callbacks which have been defined with {{define-external}}. --- Previous: [[Module (chicken pathname)]] Next: [[Module (chicken plist)]] Description of your changes:

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