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sad(4d)
Device Drivers & /dev files sad(4D)
NAME
sad - STREAMS Administrative Driver
SYNOPSIS
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/sad.h>
#include <sys/stropts.h>
int ioctl(int fildes, int command, int arg);
DESCRIPTION
The STREAMS Administrative Driver provides an interface for applica‐
tions to perform administrative operations on STREAMS modules and driv‐
ers. The interface is provided through ioctl(2) commands. Privileged
operations may access the sad driver using /dev/sad/admin. Unprivileged
operations may access the sad driver using /dev/sad/user.
The fildes argument is an open file descriptor that refers to the sad
driver. The command argument determines the control function to be per‐
formed as described below. The arg argument represents additional
information that is needed by this command. The type of arg depends
upon the command, but it is generally an integer or a pointer to a com‐
mand-specific data structure.
COMMAND FUNCTIONS
The autopush facility (see autopush(8)) allows one to configure a list
of modules to be automatically pushed on a stream when a driver is
first opened. Autopush is controlled by the following commands:
SAD_SAP Allows the administrator to configure the given device's
autopush information. arg points to a strapush structure,
which contains the following members:
unit_t ap_cmd;
major_t sap_major;
minor_t sap_minor;
minor_t sap_lastminor;
unit_t sap_npush;
unit_t sap_list [MAXAPUSH] [FMNAMESZ + 1];
The sap_cmd field indicates the type of configuration being
done. It may take on one of the following values:
SAP_ONE Configure one minor device of a driver.
SAP_RANGE Configure a range of minor devices of a driver.
SAP_ALL Configure all minor devices of a driver.
SAP_CLEAR Undo configuration information for a driver.
The sap_major field is the major device number of the device
to be configured. The sap_minor field is the minor device
number of the device to be configured. The sap_lastminor
field is used only with the SAP_RANGE command, which config‐
ures a range of minor devices between sap_minor and
sap_lastminor, inclusive. The minor fields have no meaning
for the SAP_ALL command. The sap_npush field indicates the
number of modules to be automatically pushed when the device
is opened. It must be less than or equal to MAXAPUSH,
defined in sad.h. It must also be less than or equal to
NSTRPUSH, the maximum number of modules that can be pushed
on a stream, defined by the nstrpush system tunable. The
field sap_list is an array of NULL-terminated module names
to be pushed in the order in which they appear in the list.
When using the SAP_CLEAR command, the user sets only
sap_major and sap_minor. This will undo the configuration
information for any of the other commands. If a previous
entry was configured as SAP_ALL, sap_minor should be set to
zero. If a previous entry was configured as SAP_RANGE,
sap_minor should be set to the lowest minor device number in
the range configured.
On failure, errno is set to the following value:
EFAULT arg points outside the allocated address space.
EINVAL The major device number is invalid, the number of
modules is invalid, or the list of module names is
invalid.
ENOSTR The major device number does not represent a
STREAMS driver.
EEXIST The major-minor device pair is already configured.
ERANGE The command is SAP_RANGE and sap_lastminor is not
greater than sap_minor, or the command is
SAP_CLEAR and sap_minor is not equal to the first
minor in the range.
ENODEV The command is SAP_CLEAR and the device is not
configured for autopush.
ENOSR An internal autopush data structure cannot be
allocated.
SAD_GAP Allows any user to query the sad driver to get the autopush
configuration information for a given device. arg points to
a strapush structure as described in the previous command.
The user should set the sap_major and sap_minor fields of
the strapush structure to the major and minor device num‐
bers, respectively, of the device in question. On return,
the strapush structure will be filled in with the entire
information used to configure the device. Unused entries in
the module list will be zero-filled.
On failure, errno is set to one of the following values:
EFAULT arg points outside the allocated address space.
EINVAL The major device number is invalid.
ENOSTR The major device number does not represent a
STREAMS driver.
ENODEV The device is not configured for autopush.
SAD_VML Allows any user to validate a list of modules (that is, to
see if they are installed on the system). arg is a pointer
to a str_list structure with the following members:
int sl_nmods;
struct str_mlist *sl_modlist;
The str_mlist structure has the following member:
char l_name[FMNAMESZ+1];
sl_nmods indicates the number of entries the user has allo‐
cated in the array and sl_modlist points to the array of
module names. The return value is 0 if the list is valid, 1
if the list contains an invalid module name, or −1 on fail‐
ure. On failure, errno is set to one of the following val‐
ues:
EFAULT arg points outside the allocated address space.
EINVAL The sl_nmods field of the str_list structure is
less than or equal to zero.
SEE ALSO
Intro(2), ioctl(2), open(2)
STREAMS Programming Guide
DIAGNOSTICS
Unless otherwise specified, the return value from ioctl() is 0 upon
success and −1 upon failure with errno set as indicated.
Oracle Solaris 11.4 11 May 2021 sad(4D)