AUTOPUSH(8) Maintenance Procedures AUTOPUSH(8)


autopush - configures lists of automatically pushed STREAMS modules


autopush -f filename

autopush -g -M major -m minor

autopush -r -M major -m minor


The autopush command configures the list of modules to be automatically
pushed onto the stream when a device is opened. It can also be used to
remove a previous setting or get information on a setting.


The following options are supported:

-f filename

Sets up the autopush configuration for each driver according to the
information stored in filename. An autopush file consists of lines of
four or more fields, separated by spaces as shown below:

major minor last-minor module1 module2 ... module8

The first field is a string that specifies the major device name, as
listed in the /kernel/drv directory. The next two fields are integers
that specify the minor device number and last-minor device number.
The fields following represent the names of modules. If minor is -1,
then all minor devices of a major driver specified by major are
configured, and the value for last-minor is ignored. If last-minor is
0, then only a single minor device is configured. To configure a
range of minor devices for a particular major, minor must be less
than last-minor.

The remaining fields list the names of modules to be automatically
pushed onto the stream when opened, along with the position of an
optional anchor. The maximum number of modules that can be pushed is
eight. The modules are pushed in the order they are specified. The
optional special character sequence [anchor] indicates that a STREAMS
anchor should be placed on the stream at the module previously
specified in the list; it is an error to specify more than one anchor
or to have an anchor first in the list.

A nonzero exit status indicates that one or more of the lines in the
specified file failed to complete successfully.


Gets the current configuration setting of a particular major and
minor device number specified with the -M and -m options respectively
and displays the autopush modules associated with it. It will also
return the starting minor device number if the request corresponds to
a setting of a range (as described with the -f option).

-m minor

Specifies the minor device number.

-M major

Specifies the major device number.


Removes the previous configuration setting of the particular major
and minor device number specified with the -M and -m options
respectively. If the values of major and minor correspond to a
previously established setting of a range of minor devices, where
minor matches the first minor device number in the range, the
configuration would be removed for the entire range.


The following exit values are returned:


Successful completion.


An error occurred.


Example 1: Using the autopush command.

The following example gets the current configuration settings for the
major and minor device numbers as indicated and displays the autopush
modules associated with them for the character-special device

example# autopush -g -M 29 -m 0
Major Minor Lastminor Modules
29 0 1 ldterm ttcompat




sad(4D), streamio(4I), ldterm(4M), ttcompat(4M), attributes(7), dladm(8),


The use of the autopush command is obsolete for networking data-links.
The preferred method of configuring a list of automatically pushed
STREAMS modules on a given networking data-link interface is the dladm(8)
autopush link property.

Because network devices are self-cloning, the autopush command is
inadequate for networking devices. The granularity of the autopush
command's configuration is driver-wide, and not per-interface as one
might expect. Another reason not to use autopush is that administrators
are more familiar with the names of their network interfaces than with
device major and minor numbers. The dladm(8) command allows the
configuration using data-link interface names.

February 15, 2008 AUTOPUSH(8)