The perform stream-exterior-format returns the canonical identify of the external format (See Exterior Vape Starter Kits Codecs) utilized by the stream for Vapor Hardware character-primarily based input and/or output. If a named international struct specifier is handed to define-alien-sort or with-alien, Vape Mods then this defines, respectively, a new international or native international structure sort. The overseas sort specifier (sb-alien:union title &rest fields) is much like sb-alien:struct, however describes a union sort.
The extern-alien macro returns an alien with the desired type which factors to an externally defined value. ANSI C. A null alien pointer can be detected with the sb-alien:null-alien operate. Storing Lisp NIL in a c-string writes C NULL to the variable. If null-terminate is true (the default), the alien string is terminated by a further null byte. The function enter-stream-p will return true of any generalized occasion of basic-enter-stream. 1. If dont-save is true (default is nil), the shared object will probably be dropped when save-lisp-and-die known as — in any other case shared objects are reloaded mechanically when a saved core starts up.
2. On most platforms references in compiled code to international symbols in shared objects (corresponding to these generated by outline-alien-routine) remain valid across save-lisp-and-die. See the :callable-exports key phrase to save lots of-lisp-and-die for Vape Shop how to save the Lisp image in a manner that allows a C program to initialize the Lisp runtime and the exported symbols. This permits c-string pointers to be initialized. This part contains documentation (or pointers to documentation) for Vapor Starter Kits some of the contributed modules.
Additionally the decrease-degree System Area Pointers (or vape shop SAPs) can be used the place necessary to provide untyped access to foreign reminiscence. As famous at the beginning of the chapter, the System Area Pointer facilities permit untyped access to overseas reminiscence. We additionally believe that generally cleaning out legacy interfaces helps keep the whole system more comprehensible to customers, and makes introspective tools similar to apropos more useful. Different varieties are not inherently named, however might be given named abbreviations utilizing the define-alien-type macro.
Since Lisp is a dynamically typed language, even overseas objects should have a run-time type; this kind information is supplied by encapsulating the raw pointer to the overseas knowledge within an alien-value object. Some Lisp pathname ideas (such as the :again listing part) don’t have any direct equivalents in most Operating Programs; the behaviour of native-namestring is unspecified if an inappropriate pathname designator is handed to it.
Home listing specifiers are resolved to residence directory of the present or specified user by native-namestring, Vape Shop which is utilized by the implementation to translate pathnames before passing them on to working system specific routines. To allow the consumer to deal with this, the following functions are supplied: parse-native-namestring and native-pathname return the closest equal Lisp pathname to a given string (acceptable for the Operating System), whereas native-namestring converts a non-wild pathname designator to the equivalent native namestring, if potential.
