# UNIX System Call

**Canonical:** https://apis.io/providers/unix/  
**APIs profiled:** 11

Core UNIX/POSIX system calls providing low-level operating system interfaces for process management, file operations, interprocess communication, and system control.

## Kin Score — 15.8 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 15.8).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (11)

- **File System Operations API** — System calls for file and directory manipulation, including open, read, write, and file descriptor management.
- **Process Management API** — System calls for process creation, execution, termination, and control.
- **Interprocess Communication API** — System calls for communication between processes including pipes, signals, and shared memory.
- **Memory Management API** — System calls for memory allocation, mapping, and protection.
- **System Information API** — System calls for retrieving system information and configuration.
- **POSIX Threads API** — POSIX threads (pthreads) interface for creating and managing threads, mutexes, condition variables, and thread-specific data.
- **I/O Multiplexing API** — System calls for monitoring multiple file descriptors for readiness, enabling event-driven and non-blocking I/O patterns.
- **POSIX Semaphores API** — POSIX named and unnamed semaphore interfaces for process and thread synchronization.
- **POSIX Message Queues API** — POSIX message queue interfaces for exchanging messages between processes with priority support.
- **Terminal and Device I/O API** — POSIX terminal interface (termios) and device control system calls for managing terminals, serial ports, and device parameters.
- **File Locking API** — POSIX advisory file locking interfaces for coordinating file access between processes.

## Security (1)

- **Unix Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Unix Plans Pricing**

## Use cases (6)

- **Operating system development**
- **Systems programming and embedded systems**
- **Network server and daemon development**
- **High-performance I/O applications**
- **Concurrent and multi-threaded programming**
- **Device driver and hardware interface development**

## Tags

C API, Ieee-1003, Kernel, Open-Group, Operating System, POSIX, System-Calls, Unix

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/unix/). Scores are computed from the provider's own public artifacts under a published rubric.