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setreuid - set real and effective user ID’s
Standard C Library (libc, -lc)
setreuid(uid_t ruid, uid_t euid);
The real and effective user IDs of the current process are set according
to the arguments. If ruid or euid 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
If the real user ID is changed (i.e. ruid is not -1) or the effective
user ID is changed to something other than the real user ID, then the
saved user ID will be set to the effective user ID.
The setreuid() system call 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 seteuid(2)
When setting the real and effective user IDs to the same value, the
standard setuid() system call is preferred.
The setreuid() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
[EPERM] 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.
getuid(2), issetugid(2), seteuid(2), setuid(2)
The setreuid() system call appeared in 4.2BSD.