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--------------------------------------------------------------------------------
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DEPMOD(8) Linux Module Support DEPMOD(8)
NAME
depmod - handle dependency descriptions for loadable kernel modules
SYNOPSIS
depmod [-aA] [-ehnqrsuvV] [-C configfile] [-F kernelsyms] [-b basedirectory] [forced_version]
depmod [-enqrsuv] [-F kernelsyms] module1.o module2.o ...
DESCRIPTION
The depmod and modprobe utilities are intended to make a Linux modular kernel manageable for all users, administrators and distribution
maintainers.
Depmod creates a "Makefile"-like dependency file, based on the symbols it finds in the set of modules mentioned on the command line or from
the directories specified in the configuration file. This dependency file is later used by modprobe to automatically load the correct mod-
ule or stack of modules.
The normal use of depmod is to include the line
/sbin/depmod -a
somewhere in the rc-files in /etc/rc.d, so that the correct module dependencies will be available immediately after booting the system.
Note that the option -a is now optional. For boot-up purposes, the option -q might be more appropriate since that makes depmod silent
about unresolved symbols.
It is also possible to create the dependency file immediately after compiling a new kernel. If you do "depmod -a 2.2.99" when you have
compiled kernel 2.2.99 and its modules the first time, while still running e.g. 2.2.98, the file will be created in the correct place. In
this case however, the dependencies on the kernel will not be guaranteed to be correct. See the options -F, -C and -b above for more
information on handling this.
While building the relationship between modules and the symbols exported by other modules, depmod does not consider the GPL status of the
modules nor of the exported symbols. That is, depmod will not flag an error if a module without a GPL compatible license refers to a GPL
only symbol (EXPORT_SYMBOL_GPL in the kernel). However insmod will refuse to resolve GPL only symbols for non-GPL modules so the actual
load will fail.
OPTIONS
-a, --all
Search for modules in all directories specified in the (optional) configuration file /etc/modules.conf.
-A, --quick
Compare file timestamps and, if necessary, act like depmod -a. This option only updates the dependency file if anything has
changed.
-e, --errsyms
Show all the unresolved symbols for each module.
-h, --help
Display a summary of options and immediately exit.
-n, --show
Write the dependency file on stdout instead of in the /lib/modules tree.
-q, --quiet
Tell depmod to keep quiet and not to complain about missing symbols.
-r, --root
Some users compile modules under a non-root userid then install the modules as root. This process can leave the modules owned by
the non-root userid, even though the modules directory is owned by root. If the non-root userid is compromised, an intruder can
overwrite existing modules owned by that userid and use this exposure to bootstrap up to root access.
By default, modutils will reject attempts to use a module that is not owned by root. Specifying -r will suppress the error and
allow root to load modules that are not owned by root.
Use of -r is a major security exposure and is not recommended.
-s, --syslog
Write all error messages via the syslog daemon instead of stderr.
-u, --unresolved-error
depmod 2.4 does not set a return code when there are any unresolved symbols. The next major release of modutils (2.5) will set a
return code for unresolved symbols. Some distributions want a non-zero return code in modutils 2.4 but that change might cause
problems for users who expect the old behaviour. If you want a non-zero return code in depmod 2.4, specify -u. depmod 2.5 will
silently ignore the -u flag and will always give a non-zero return code for unresolved symbols.
-v, --verbose
Show the name of each module as it is being processed.
-V, --version
Display the version of depmod.
The following options are useful for people managing distributions:
-b basedirectory, --basedir basedirectory
If the directory tree /lib/modules containing the sub-trees of modules is moved somewhere else in order to handle modules for a dif-
ferent environment, the -b option tells depmod where to find the moved image of the /lib/modules tree. The file references in the
depmod output file that is built, modules.dep, will not contain the basedirectory path. This means that when the file tree is moved
back from basedirectory/lib/modules into /lib/modules in the final distribution, all references will be correct.
-C configfile, --config configfile
Use the file configfile instead of /etc/modules.conf. The environment variable MODULECONF can also be used to select a different
configuration file from the default /etc/modules.conf (or /etc/conf.modules (deprecated)).
When environment variable
UNAME_MACHINE is set, modutils will use its value instead of the machine field from the uname() syscall. This is mainly of use when
you are compiling 64 bit modules in 32 bit user space or vice versa, set UNAME_MACHINE to the type of the modules being built. Cur-
rent modutils does not support full cross build mode for modules, it is limited to choosing between 32 and 64 bit versions of the
host architecture.
-F kernelsyms,--filesyms kernelsyms
When building dependency files for a different kernel than the currently running kernel, it is important that depmod uses the cor-
rect set of kernel symbols to resolve the kernel references in each module. These symbols can either be a copy of System.map from
the other kernel, or a copy of the output from /proc/ksyms. If your kernel uses versioned symbols, it is best to use a copy of the
/proc/ksyms output, since that file contains the symbol versions of the kernel symbols. However you can use a System.map even with
versioned symbols.
CONFIGURATION
The behavior of depmod and modprobe can be adjusted by the (optional) configuration file /etc/modules.conf.
See modprobe(8) and modules.conf(5) for a complete description.
STRATEGY
Each time you compile a new kernel, the command "make modules_install" will create a new directory, but won't change the default.
When you get a module unrelated to the kernel distribution you should place it in one of the version-independent directories under
/lib/modules.
This is the default strategy, which can be overridden in /etc/modules.conf.
FILES
/etc/modules.conf (alternatively but deprecated /etc/conf.modules)
/lib/modules/*/modules.dep,
/lib/modules/*
SEE ALSO
modules.conf(5), modprobe(8), modinfo(8), lsmod(8), ksyms(8)
BUGS
depmod [ -V | --version ] should exit immediately. Instead, it prints the version information and behaves as if no options were given.
AUTHORS
Jacques Gelinas (jack@solucorp.qc.ca)
Bjorn Ekwall (bj0rn@blox.se)
Linux January 26, 2002 DEPMOD(8)