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@c  preface.texi,v 1.6 2002/01/17 21:47:45 joel Exp

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@node Preface, General, Top, Top

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@unnumbered Preface

This document lists the functions, constant, macros, feature flags,

and types defined in the POSIX 1003.1 standard.  Each section in

this document corresponds to a section in the 1003.1 standard

and the implementation status of the items required by the standard

are listed.

RTEMS supports a number of POSIX process, user, and group oriented

routines in what is referred to as a "SUSP" (Single-User, Single

Process) manner.  RTEMS supports a single process, multithreaded

POSIX 1003.1b environment.  In a pure world, there would be

no reason to even include routines like @code{getpid()} when there

can only be one process.  But providing routines like @code{getpid()}

and making them work in a sensible fashion for an embedded environment

while not returning ENOSYS (for not implemented) makes it significantly

easier to port code from a UNIX environment without modifying it.