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Diffstat (limited to 'doc/posix1003.1')
| -rw-r--r-- | doc/posix1003.1/preface.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/posix1003.1/preface.texi b/doc/posix1003.1/preface.texi index f14a9b58a6..562c7e58d6 100644 --- a/doc/posix1003.1/preface.texi +++ b/doc/posix1003.1/preface.texi @@ -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. |