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

    NAME
           setreuid, seteuid - set real and / or effective user ID

    SYNOPSIS
           #include <unistd.h>

           int setreuid(uid_t ruid, uid_t euid);
           int seteuid(uid_t euid);

    DESCRIPTION
           setreuid  sets real and effective user ID's of the current
           process.  Un-privileged users may change the real user  ID
           to the effective user ID and vice-versa.

           Prior  to  Linux  1.1.37, the saved ID paradigm, when used
           with setreuid or seteuid was broken.

           Starting at 1.1.37, it is also possible to set the  effec-
           tive user ID from the saved user ID.

           Only the super-user may make other changes.

           Supplying  a  value of -1 for either the real or effective
           user ID forces the system to leave that ID unchanged.

           Currently  (libc-4.x.x),  seteuid(euid)  is   functionally
           equivalent to setreuid(-1, euid).

           If the real user ID is changed or the effective user ID is
           set to a value not equal to the previous real user ID, the
           saved user ID will be set to the new effective user ID.

    RETURN VALUE
           On  success,  zero is returned.  On error, -1 is returned,
           and errno is set appropriately.

    ERRORS
           EPERM   The current process  is  not  the  super-user  and
                   changes other than (i) swapping the effective user
                   ID with the real user ID or (ii)  setting  one  to
                   the value of the other or (iii) setting the effec-
                   tive user ID to the value of the saved user ID was
                   specified.

    HISTORY
           The setreuid function call appeared in BSD 4.2.

    CONFORMING TO
           BSD 4.3

### SEE ALSO

getuid, setuid,

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    Linux 1.1.38             2nd August 1994                        1

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