RTEMS POSIX API User's Guide
POSIX considers user and group Ids to be a unique integer that
may be associated with a name. This is usually accomplished
via a file named /etc/passwd for user Id mapping and
/etc/groups for group Id mapping. Again, although
RTEMS is effectively a single process and thus single user
system, it provides limited support for user and group
names. When configured with an appropriate filesystem, RTEMS
will access the appropriate files to map user and group Ids
to names.
If these files do not exist, then RTEMS will synthesize a minimal version so this family of services return without error. It is important to remember that a design goal of the RTEMS POSIX services is to provide useable and meaningful results even though a full process model is not available.
RTEMS POSIX API User's Guide
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