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Man Pages
SETREUID(2) FreeBSD System Calls Manual SETREUID(2)

setreuid
set real and effective user ID's

Standard C Library (libc, -lc)

#include <unistd.h>
int
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 changes.
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) system call.
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 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.

getuid(2), issetugid(2), seteuid(2), setuid(2)

The setreuid() system call appeared in 4.2BSD.
February 8, 2001 FreeBSD 12.0-RELEASE

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