4.3BSD - /usr/man/cat2/setreuid.0

SETREUID(2)                                                        SETREUID(2)


NAME
       setreuid - set real and effective user ID’s

SYNOPSIS
       setreuid(ruid, euid)
       int ruid, euid;

DESCRIPTION
       The real and effective user ID’s of the current process are set accord‐
       ing 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.

RETURN VALUE
       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), setregid(2), setuid(3)


4th Berkeley Distribution         May 9, 1985                      SETREUID(2)