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Added paragraph describing SUSP.

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Joel Sherrill
1999-11-15 21:04:01 +00:00
parent 9da09940e4
commit cb193710f4
1 changed files with 9 additions and 0 deletions
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doc/posix1003.1/preface.texi
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@@ -18,3 +18,12 @@ 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.