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| <h4 class="subsection">1.2.2 POSIX (The Portable Operating System Interface)</h4> |
| |
| <p><a name="index-POSIX-5"></a><a name="index-POSIX_002e1-6"></a><a name="index-IEEE-Std-1003_002e1-7"></a><a name="index-ISO_002fIEC-9945_002d1-8"></a><a name="index-POSIX_002e2-9"></a><a name="index-IEEE-Std-1003_002e2-10"></a><a name="index-ISO_002fIEC-9945_002d2-11"></a> |
| The GNU library is also compatible with the ISO <dfn>POSIX</dfn> family of |
| standards, known more formally as the <dfn>Portable Operating System |
| Interface for Computer Environments</dfn> (ISO/IEC 9945). They were also |
| published as ANSI/IEEE Std 1003. POSIX is derived mostly from various |
| versions of the Unix operating system. |
| |
| <p>The library facilities specified by the POSIX standards are a superset |
| of those required by ISO C<!-- /@w -->; POSIX specifies additional features for |
| ISO C<!-- /@w --> functions, as well as specifying new additional functions. In |
| general, the additional requirements and functionality defined by the |
| POSIX standards are aimed at providing lower-level support for a |
| particular kind of operating system environment, rather than general |
| programming language support which can run in many diverse operating |
| system environments. |
| |
| <p>The GNU C library implements all of the functions specified in |
| <cite>ISO/IEC 9945-1:1996, the POSIX System Application Program |
| Interface</cite>, commonly referred to as POSIX.1. The primary extensions to |
| the ISO C<!-- /@w --> facilities specified by this standard include file system |
| interface primitives (see <a href="File-System-Interface.html#File-System-Interface">File System Interface</a>), device-specific |
| terminal control functions (see <a href="Low_002dLevel-Terminal-Interface.html#Low_002dLevel-Terminal-Interface">Low-Level Terminal Interface</a>), and |
| process control functions (see <a href="Processes.html#Processes">Processes</a>). |
| |
| <p>Some facilities from <cite>ISO/IEC 9945-2:1993, the POSIX Shell and |
| Utilities standard</cite> (POSIX.2) are also implemented in the GNU library. |
| These include utilities for dealing with regular expressions and other |
| pattern matching facilities (see <a href="Pattern-Matching.html#Pattern-Matching">Pattern Matching</a>). |
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