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The real
and effective user ID’s of the current process are set according to the
arguments. If or is -1, the current uid is filled in by the system. Unprivileged
users may change the real user ID to the effective user ID and vice-versa;
only the super-user may make other changes. The function has been used
to swap the real and effective user IDs in set-user-ID programs to temporarily
relinquish the set-user-ID value. This purpose is now better served by the
use of the function (see When setting the real and effective user IDs
to the same value, the standard function is preferred.
Upon
successful completion, a value of 0 is returned. Otherwise, a value of
-1 is returned and is set to indicate the error.
The current process
is not the super-user and a change other than changing the effective user-id
to the real user-id was specified.
The function call
appeared in and was dropped in
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