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OpenSolaris 2009.06 - man page for setreuid (opensolaris section 2)

setreuid(2)				   System Calls 			      setreuid(2)

NAME
       setreuid - set real and effective user IDs

SYNOPSIS
       #include <unistd.h>

       int setreuid(uid_t ruid, uid_t euid);

DESCRIPTION
       The  setreuid()	function  is  used  to set the real and effective user IDs of the calling
       process. If ruid is -1, the real user ID is not changed; if euid is -1, the effective user
       ID  is  not changed. The real and effective user IDs may be set to different values in the
       same call.

       If the {PRIV_PROC_SETID} privilege is  asserted	in  the  effective  set  of  the  calling
       process, the real user ID and the effective user ID can be set to any legal value.

       If  the	{PRIV_PROC_SETID}  privilege  is not asserted in the effective set of the calling
       process, either the real user ID can be set to the effective user  ID,  or  the	effective
       user  ID can either be set to the saved set-user ID from execve() (seeexec(2)) or the real
       user ID.

       In either case, if the real user ID is being changed (that is, if ruid is not  -1), or the
       effective  user	ID  is	being changed to a value not equal to the real user ID, the saved
       set-user ID is set equal to the new effective user ID.

       All privileges are required to change to uid 0.

RETURN VALUES
       Upon successful completion, 0 is returned. Otherwise, -1 is  returned,  errno  is  set  to
       indicate the error, and neither of the user IDs will be changed.

ERRORS
       The setreuid() function will fail if:

       EINVAL	 The  value  of  ruid or euid is less than  0 or greater than UID_MAX (defined in
		 <limits.h>).

       EPERM	 The {PRIV_PROC_SETID} privilege is not asserted in  the  effective  set  of  the
		 calling  processes  and a change was specified other than changing the real user
		 ID to the effective user ID, or changing the effective user ID to the real  user
		 ID or the saved set-user ID. See privileges(5) for additional restrictions which
		 apply when changing to UID 0.

USAGE
       If a set-user-ID process sets its effective user ID to its real user ID, it can still  set
       its effective user ID back to the saved set-user ID.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       exec(2), getuid(2), setregid(2), setuid(2), attributes(5), privileges(5), standards(5)

SunOS 5.11				   22 Mar 2004				      setreuid(2)


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