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# Access to POSIX

This chapter describes Scheme 48's interface to the POSIX C calls [1]. Scheme versions of most of the functions in POSIX are provided. Both the interface and implementation are new and are likely to change in future releases. Section * lists which Scheme functions call which C functions.

Scheme 48's POSIX interface will likely change significantly in the future. The implementation is new and may have significant bugs.

The POSIX bindings are available in several structures:

> `posix-processes` | fork, exec, and friends
> `posix-process-data` | information about processes
> `posix-files` | files and directories
> `posix-i/o` | operations on ports
> `posix-time` | time functions
> `posix-users` | users and groups
> `posix-regexps` | regular expression matching
> `posix` | all of the above

Scheme 48's POSIX interface differs from Scsh's [10][11] in several ways. The interface here lacks Scsh's high-level constructs and utilities, such as the process notation, `awk` procedure, and parsing utilities. Scheme 48 uses distinct types for some values that Scsh leaves as symbols or unboxed integers; these include file types, file modes, and user and group ids. Many of the names and other interface details are different, as well.

- Process primitives
- Signals
- Process environment
- Users and groups
- OS and machine identification
- Files and directories
- Time
- I/O
- Regular expressions
- C to Scheme correspondence

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