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NetBSD 6.1.5 - man page for setreuid (netbsd section 2)

SETREUID(2)			     BSD System Calls Manual			      SETREUID(2)

     setreuid -- set real and effective user ID's

     Standard C Library (libc, -lc)

     #include <unistd.h>

     setreuid(uid_t ruid, uid_t euid);

     This interface is made obsolete by the saved ID functionality in setuid(2) and seteuid(2).

     The real and effective user ID's of the current process are set according to the arguments.
     If the real user ID is changed, the saved user ID is changed to the new value of the effec-
     tive user ID.

     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 may change the effective user ID to
     the real user ID or the saved user ID; 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, this function is equivalent
     to the setuid() function.	When setting only the effective user ID, this function is equiva-
     lent to the seteuid() function.

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

     [EPERM]		The current process is not the super-user and a change other than chang-
			ing the effective user-id to the real user-id was specified.

     getuid(2), seteuid(2), setgid(2), setuid(2)

     The setreuid() function call appeared in 4.2BSD.  An incompatible version was implemented in
     4.4BSD.  It was reimplemented in NetBSD 1.2 in a way compatible with 4.3BSD, SunOS and
     Linux, but should not be used in new code.

BSD					 January 5, 2001				      BSD

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