sad(7)sad(7)NAMEsad - STREAMS Administrative Driver
SYNOPSIS
...
DESCRIPTION
The driver provides an interface to the facility using the function.
As an interface, the driver enables administrative tasks to be per‐
formed on STREAMS modules and drivers. By specifying the command
parameter to the function, an administrator can configure information
for a device, get information on a device, or check a list of modules.
fildes is a file descriptor obtained by opening using command specifies
the administrative function to be performed. arg points to a data
structure. If command is or arg points to a struct of type If command
is arg points to a struct of type
Security Restrictions
The is restricted to superusers or users with the privilege. See privi‐
leges(5) for more information about privileged access on systems that
support fine-grained privileges.
ioctl Commands
The commands used to perform administrative functions on a STREAMS mod‐
ule or driver are specified by the following commands:
Allows you to configure
information for a device. The arg parameter points to a
structure (defined in the header file), whose members are as
follows:
Allows you to specify the type of
configuration to perform. This field can have the
following values:
Configures all minor devices.
Configures a range of minor devices.
Configures a single minor device.
Clears the previous settings.
Specify only the and fields when using
this command. If a previous entry speci‐
fied set the field to 0 (zero). If a
previous entry was specified as set the
field to the lowest minor device number
in the range.
Specifies the major device number.
Specifies the minor device number.
Specifies the range of minor devices.
Specifies the number of modules to push.
This number must be no more than which is defined
in Additionally, this number must not exceed
Specifies, in order, the array of modules to push.
Lets you use the
driver to obtain configuration information for a device by
setting the and fields of the structure (see the command) to
the major and minor device numbers of the device being
queried.
arg should point to a struct of type Upon successful comple‐
tion, the structure contains all of the information used to
configure the device. Values of 0 (zero) will appear in any
unused entry in the module list.
Enables you to check a list of modules.
For example, you can determine if a specific module has been
installed. The arg parameter points to a structure (defined
in the header file), whose members are as follows:
Specifies the number of entries you have allocated in an
array.
Points to the array of module names.
The structure (also in the header file) is as fol‐
lows:
where specifies the array of module names.
If the array is valid, the command returns a value
of 0 (zero). If the array contains an invalid mod‐
ule name, the command returns a value of 1. Upon
failure, the command returns a value of -1.
Notes
As a STREAMS driver, also supports the normal STREAMS
In this form, specify the field in the structure to either or The field
points to the structure (see the command in the section). Refer to the
streamio(7) reference page for further details.
RETURN VALUE
Unless specified otherwise, upon successful completion, the commands
return a value of 0 (zero). Otherwise, a value of -1 is returned.
ERRORS
If any of the following conditions occur, the commands return the cor‐
responding value:
The specified major/minor device number pair
has already been configured.
The arg parameter points outside the allo‐
cated address space.
The major device number
is invalid, the number of modules is
invalid, or the list of module names is
invalid.
The device is not configured for
This value is returned from a command.
A internal data structure cannot be allocated.
The major device does not represent a
STREAMS driver.
The field is less than the field when the
command is or the minor device speci‐
fied in a command does not exist.
Only a superuser or user with
privilege is allowed to execute the
The arg parameter points outside the
allocated address space.
The major device number
is invalid.
The device is not configured for
The major device does not represent a
STREAMS driver.
The arg parameter points out‐
side the allocated
address space.
The list of module names is invalid.
SEE ALSOautopush(1M), ioctl(2), open(2), privileges(5),
streamio(7).
sad(7)
