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@(#)setreuid.2 8.2 (Berkeley) 4/16/94
$FreeBSD: head/lib/libc/sys/setreuid.2 72214 2001-02-09 12:47:23Z ru $
.Dd February 8, 2001 .Dt SETREUID 2 .Os BSD 4 .Sh NAME .Nm setreuid .Nd set real and effective user ID's .Sh LIBRARY .Lb libc .Sh SYNOPSIS .Fd #include <unistd.h> .Ft int .Fn setreuid "uid_t ruid" "uid_t euid" .Sh DESCRIPTION The real and effective user IDs of the current process are set according to the arguments. If .Fa ruid or .Fa 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.
p If the real user ID is changed (i.e.\& .Fa 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.
p The .Fn setreuid 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 .Fn seteuid function (see .Xr setuid 2 ) .
p When setting the real and effective user IDs to the same value, the standard .Fn setuid function is preferred. .Sh RETURN VALUES .Rv -std setreuid .Sh ERRORS l -tag -width Er t Bq Er 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. .El .Sh SEE ALSO .Xr getuid 2 , .Xr issetugid 2 , .Xr seteuid 2 , .Xr setuid 2 .Sh HISTORY The .Fn setreuid system call appeared in x 4.2 .