setreuid(2) [sunos man page]

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 5.10							    22 Mar 2004 						       setreuid(2)

Check Out this Related Man Page

setregid(2)							   System Calls 						       setregid(2)

NAME

       setregid - set real and effective group IDs

SYNOPSIS

       #include <unistd.h>

       int setregid(gid_t rgid, gid_t egid);

DESCRIPTION

       The  setregid()	function  is used to set the real and effective group IDs of the calling process.  If rgid is -1, the real group ID is not
       changed; if egid is -1, the effective group ID is not changed.  The real and effective group 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 group ID and the effective group 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 group ID can be set to  the
       saved set-group-ID from execve(2), or the effective group ID can either be set to the saved set-group-ID or the real group ID.

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

RETURN VALUES

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

ERRORS

       The setregid() function will fail if:

       EINVAL	       The value of rgid or egid 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 group ID to the saved set-group-ID or changing the effective group ID to the real group ID	or
		       the saved group ID.

USAGE

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

ATTRIBUTES

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

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

SEE ALSO

       execve(2), getgid(2), setreuid(2), setuid(2), attributes(5), privileges(5), standards(5)

SunOS 5.10							    22 Mar 2004 						       setregid(2)

Linux and UNIX Man Pages

setreuid(2) [sunos man page]

Check Out this Related Man Page