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SETREUID(2)                 BSD Programmer's Manual                SETREUID(2)

NAME
     setreuid - set real and effective user ID's

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     int
     setreuid(uid_t ruid, uid_t euid);

DESCRIPTION
     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 effec-
     tive user ID and vice-versa; only the super-user may make other changes.

     The 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 seteuid()
     function (see setuid(2)).

     When setting the real and effective user IDs to the same value, the stan-
     dard setuid() function is preferred.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.

ERRORS
     [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.

SEE ALSO
     getuid(2),  seteuid(2),  setuid(2)

HISTORY
     The setreuid function call appeared in 4.2BSD and was dropped in 4.4BSD.

4th Berkeley Distribution       April 16, 1994                               1