Shell command execution always giving zero as return value Post: 302666361

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LEARN ABOUT REDHAT

ng_device

NG_DEVICE(4)						   BSD Kernel Interfaces Manual 					      NG_DEVICE(4)

NAME

     ng_device -- device netgraph node type

SYNOPSIS

     #include <netgraph/ng_device.h>

DESCRIPTION

     A device node is both a netgraph node and a system device interface.  When a device node is created, a new device entry appears which is
     accessible via the regular file operators such as open(2), close(2), read(2), write(2), etc.

     The first node is created as /dev/ngd0, all subsequent nodes /dev/ngd1, /dev/ngd2, etc.

HOOKS

     A device node has a single hook with an arbitrary name.  All data coming in over the hook will be presented to the device for read(2).  All
     data coming in from the device entry by write(2) will be forwarded to the hook.

CONTROL MESSAGES

     The device node supports one non-generic control message:

     NGM_DEVICE_GET_DEVNAME
	  Returns device name corresponding to a node.

SHUTDOWN

     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or upon hook disconnection.  The associated device entry is removed and
     becomes available for use by future device nodes.

SEE ALSO

     netgraph(4), ngctl(8)

HISTORY

     The device node type was first implemented in FreeBSD 5.0.

AUTHORS

     Mark Santcroos <marks@ripe.net>
     Gleb Smirnoff <glebius@FreeBSD.org>

BSD
								 October 19, 2004							       BSD

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