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title: POSIX API for ISLisp
author: Darren Bane
copyright: 2021 Darren Bane, CC BY_SA
# Abstract
A mapping from Scheme's SRFI-170, "POSIX API", to ISLisp is defined.
# Introduction
Although they are similar, Scheme and ISLisp are not the same language. This document adapts the standard Scheme POSIX interface to ISLisp accounting for:
* Different naming conventions (e.g. `predicatep` rather than `predicate?`)
* Historical practice, in particular compatibility with OpenLisp (the only commercial implementation) is prioritised
# Dependencies
SRFI-170 depends on at least part of several other SRFIs, in particular:
* SRFI-19, "Time Data Types and Procedures"
* SRFI-106, "Networking operations"
* SRFI-158, "Generators and Accumulators"
SRFI-39, "Parameter objects", is superseded by ISLisp's dynamic variables.
Only SRFI-106 is implemented fully; the subset of required symbols is taken from the others.
# Mapping
Any symbols not mentioned in the following are unchanged from SRFI-170.
## S3.3, "File system"
```table
┌──────────────────┬──────────────────┐
│ Scheme │ ISLisp │
╞══════════════════╪══════════════════╡
│ file-info? │ file-info-p │
├──────────────────┼──────────────────┤
│ delete-directory │ remove-directory │
└──────────────────┴──────────────────┘
```
## S3.5, "Process state"
```table
┌────────────────────────┬──────────────────┐
│ Scheme │ ISLisp │
╞════════════════════════╪══════════════════╡
│ set-umask! │ set-umask │
├────────────────────────┼──────────────────┤
│ set-current-directory! │ change-directory │
├────────────────────────┼──────────────────┤
│ pid │ getpid │
├────────────────────────┼──────────────────┤
│ user-uid │ getuid │
└────────────────────────┴──────────────────┘
```
## S3.11, "Environment variables"
```table
┌──────────────────────────┬────────┐
│ Scheme │ ISLisp │
╞══════════════════════════╪════════╡
│ get-environment-variable │ getenv │
└──────────────────────────┴────────┘
```
## S3.12, "Terminal device control"
```table
┌───────────┬───────────┐
│ Scheme │ ISLisp │
╞═══════════╪═══════════╡
│ terminal? │ terminalp │
└───────────┴───────────┘
```
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