TIME_WAIT state Post: 302295456

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Top Forums UNIX for Advanced & Expert Users TIME_WAIT state Post 302295456 by Perderabo on Sunday 8th of March 2009 11:40:20 AM

03-08-2009

Administrator Emeritus

Yes, it is really essential!!

For one thing, consider a socket that has sent the final packet which is an ACK to acknowledge the final FIN packet. If everything works right, this is the end of the connection. But what if that final ACK packet gets lost? The other side will timeout and retransmit the final FIN. A socket in TIME_WAIT will be able to retransmit that final ACK, thus allowing the other side to close down.

The other problem is wandering duplicates, packets which seemed to have disappeared, but really just got lost for a while and then finally arrived. A socket in TIME_WAIT has enough information to recognize them for what they are, and simply discard them. If the socket was destroyed somehow and a new connection is established that looks like the old connection, wandering duplicates from the first connection will be delivered to the second connection, possibly injecting garbage into the data stream.

Perderabo

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xmtogglebuttongadgetsetstate

XmToggleButtonGadgetSetState(3X)										  XmToggleButtonGadgetSetState(3X)

NAME

       XmToggleButtonGadgetSetState - A ToggleButtonGadget function that sets or changes the current state

SYNOPSIS

       #include <Xm/ToggleBG.h>

       void XmToggleButtonGadgetSetState (widget, state, notify)
	       Widget widget;
	       Boolean state;
	       Boolean notify;

DESCRIPTION

       XmToggleButtonGadgetSetState  sets  or changes the ToggleButtonGadget's current state.  Specifies the ToggleButtonGadget widget ID.  Speci-
       fies a Boolean value that indicates whether the ToggleButtonGadget state is selected or unselected.  If True, the button state is selected;
       if False, the button state is unselected.  Indicates whether XmNvalueChangedCallback is called; it can be either True or False. The XmNval-
       ueChangedCallback is only called when this function changes the state of the ToggleButtonGadget. When this argument is True and the Toggle-
       ButtonGadget  is a child of a RowColumn widget whose XmNradioBehavior is True, setting the ToggleButtonGadget causes other ToggleButton and
       ToggleButtonGadget children of the RowColumn to be unselected.

       For a complete definition of ToggleButtonGadget and its associated resources, see XmToggleButtonGadget(3X).

SEE ALSO

       XmToggleButtonGadget(3X)

														  XmToggleButtonGadgetSetState(3X)