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File Formats system(4)
NAME
system - system configuration information file
DESCRIPTION
The system file is used for customizing the operation of the
operating system kernel. The recommended procedure is to
preserve the original system file before modifying it.
The system file contains commands which are read by the ker-
nel during initialization and used to customize the opera-
tion of your system. These commands are useful for modifying
the system's treatment of its loadable kernel modules.
The syntax of the system file consists of a list of
keyword/value pairs which are recognized by the system as
valid commands. Comment lines must begin with an asterisk
(*) or a hash mark (#) and end with a newline character. All
commands are case-insensitive except where noted.
Commands that modify the system's operation with respect to
loadable kernel modules require you to specify the module
type by listing the module's namespace. The following
namespaces are currently supported on all platforms:
drv
Modules in this namespace are device drivers.
exec
Modules in this namespace are execution format modules.
The following exec modules are currently provided:
Only on SPARC system:
aoutexec
Only on x86 system:
coffexec
SunOS 5.10 Last change: 3 Nov 2004 1
File Formats system(4)
On SPARC and IA systems:
elfexec
intpexec
javaexec
fs
These modules are filesystems.
sched
These modules implement a process scheduling algorithm.
strmod
These modules are STREAMS modules.
sys
These modules implement loadable system-call modules.
misc
These modules do not fit into any of the above
categories, so are considered "miscellaneous" modules.
SPARC only:
dacf
These modules provide rules and actions for device
auto-configuration.
tod
These modules provide support for the time of day
SunOS 5.10 Last change: 3 Nov 2004 2
File Formats system(4)
hardware.
cpu
These modules provide CPU-specific kernel routines.
A description of each of the supported commands follows:
exclude: <namespace>/<modulename>
Do not allow the listed loadable kernel module to be
loaded. exclude commands are cumulative; the list of
modules to exclude is created by combining every exclude
entry in the system file.
include: <namespace>/<modulename>
Include the listed loadable kernel module. This is the
system's default, so using include does not modify the
system's operation. include commands are cumulative.
forceload: <namespace>/<modulename>
Force this kernel module to be loaded during kernel ini-
tialization. The default action is to automatically load
the kernel module when its services are first accessed.
forceload commands are cumulative.
rootdev: <device name>
Set the root device to the listed value instead of using
the default root device as supplied by the boot program.
rootfs: <root filesystem type>
Set the root filesystem type to the listed value.
SunOS 5.10 Last change: 3 Nov 2004 3
File Formats system(4)
moddir: <first module path>[[{:, }<second ...>]...]
Set the search path for loadable kernel modules. This
command operates very much like the PATH shell variable.
Multiple directories to search can be listed together,
delimited either by blank spaces or colons.
set [<module>:]<symbol> {=, |, &} [~][-]<value>
Set an integer or character pointer in the kernel or in
the selected kernel module to a new value. This command
is used to change kernel and module parameters and thus
modify the operation of your system. Assignment opera-
tions are not cumulative, whereas bitwise AND and OR
operations are cumulative.
Operations that are supported for modifying integer
variables are: simple assignment, inclusive bitwise OR,
bitwise AND, one's complement, and negation. Variables
in a specific loadable module can be targeted for modif-
ication by specifying the variable name prefixed with
the kernel module name and a colon (:) separator. Values
can be specified as hexadecimal (0x10), Octal (046), or
Decimal (5).
The only operation supported for modifying character
pointers is simple assignment. Static string data such
as character arrays cannot be modified using the set
command. Use care and ensure that the variable you are
modifying is in fact a character pointer. The set com-
mand is very powerful, and will likely cause problems if
used carelessly. The following escape sequences are sup-
ported within the quoted string:
\n (newline)
\t (tab)
\b (backspace)
EXAMPLES
Example 1: A sample system file.
The following is a sample system file.
* Force the ELF exec kernel module to be loaded during kernel
* initialization. Execution type modules are in the exec namespace.
forceload: exec/elfexec
* Change the root device to /sbus@1,f8000000/esp@0,800000/sd@3,0:a.
SunOS 5.10 Last change: 3 Nov 2004 4
File Formats system(4)
* You can derive root device names from /devices.
* Root device names must be the fully expanded Open Boot Prom
* device name. This command is platform and configuration specific.
* This example uses the first partition (a) of the SCSI disk at
* SCSI target 3 on the esp host adapter in slot 0 (on board)
* of the SBus of the machine.
* Adapter unit-address 3,0 at sbus unit-address 0,800000.
rootdev: /sbus@1,f8000000/esp@0,800000/sd@3,0:a
* Set the filesystem type of the root to ufs. Note that
* the equal sign can be used instead of the colon.
rootfs:ufs
* Set the search path for kernel modules to look first in
* /usr/phil/mod_test for modules, then in /kernel/modules (the
* default) if not found. Useful for testing new modules.
* Note that you can delimit your module pathnames using
* colons instead of spaces: moddir:/newmodules:/kernel/modules
moddir:/usr/phil/mod_test /kernel/modules.
* Set the configuration option {_POSIX_CHOWN_RESTRICTED} :
* This configuration option is enabled by default.
set rstchown = 1
* Disable the configuration option {_POSIX_CHOWN_RESTRICTED} :
set rstchown = 0
* Turn on debugging messages in the modules mydriver. This is useful
* during driver development.
set mydriver:debug = 1
* Bitwise AND the kernel variable "moddebug" with the
* one's complement of the hex value 0x880, and set
* "moddebug" to this new value.
set moddebug & ~0x880
* Demonstrate the cumulative effect of the SET
* bitwise AND/OR operations by further modifying "moddebug"
* by ORing it with 0x40.
set moddebug | 0x40
SEE ALSO
boot(1M), init(1M), kernel(1M)
WARNINGS
Use care when modifying the system file; it modifies the
operation of the kernel. If you preserved the original sys-
tem file, you can boot using boot -a, which will ask you to
specify the path to the saved file. This should allow the
system to boot correctly. If you cannot locate a system file
that will work, you may specify /dev/null. This acts as an
empty system file, and the system will attempt to boot using
its default settings.
NOTES
The /etc/system file is read only once, at boot time.
SunOS 5.10 Last change: 3 Nov 2004 5
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This page was generated on Wed Sep 12 21:37:25 GMT 2007
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