NAME
depmod — program to generate modules.dep and map files.(产生modules.dep文件和映射文件的程序。)
SYNOPSIS
depmod [-b basedir] [-e] [-F System.map] [-n] [-v] [ver-
sion] [-A ]
depmod [-e] [-FSystem.map] [-n] [-v] [version] [filename
...]
DESCRIPTION
Linux kernel modules can provide services (called "symbols") for
other modules to use (using EXPORT_SYMBOL in the code). If a
second module uses this symbol, that second module clearly
depends on the first module. These dependencies can get quite
complex.
Linux内核模块能够(叫“symbols”)其他模块提供服务来使用(在代码中使用EXPORT_SYMBOL)。如果一个二级模块提供给服务使用,那么二级模块很明显的依赖一级模块。这些相互依赖关系能够取得完整的组合。
depmod creates a list of module dependencies, by reading each
module under /lib/modules/version and determining what symbols
it exports, and what symbols it needs. By default this list is
written to modules.dep in the same directory. If filenames are
given on the command line, only those modules are examined
(which is rarely useful, unless all modules are listed).
depmod命令创建一个模块的依附性列表,通过读取在/lib/modules/version下的每一个模块决定输出什么符号。并决定需要那些符号。默认的,这个列表在同一个路径下被写入modules.dep文件中。如果在命令行给出了模块文件的名字,只对那些写了名字的文件模块进行检查。(很有用的方式,要不然将列出所有的模块。)
If a version is provided, then that kernel version’s module
directory is used, rather than the current kernel version (as
returned by "uname -r").
如果提供一个版本给depmod,那么使用内核版本的模块路径,而不使用当前的运行版本。(可以通过“uname -r”输出版本。)
depmod will also generate various map files in this directory,
for use by the hotplug infrastructure.
在这个地址下,depmod命令也产生出各种各样的映射文件。映射文件对热插拔是有用的。
OPTIONS
-b basedir --basedir basedir
If your modules are not currently in the (normal)
directory /lib/modules/version, but in a staging area,
you can specify a basedir which is prepended to the
directory name. This basedir is stripped from the
resulting modules.dep file, so it is ready to be moved
into the normal location.
如果你的模块没有在正常的/lib/modules/version里,而是运行在其他区域,你可以指定一个优先考虑的路径名称basedir,这个basedir不在modules.dep文件中,所以他准备移动到本地正常的地方。
-e --errsyms
When combined with the -F option, this reports any
symbols which a module needs which are not supplied by
other modules or the kernel. Normally, any symbols
not provided by modules are assumed to be provided by
the kernel (which should be true in a perfect world).
当结合-F参数使用的时候,这将报告模块需要的但是不被其他符号和内核支持的符号。正常情况下,不被其他模块提供的符号由内核提供给。
-e :显示出目前已载入的不可执行的模组名称
-F --filesyms System.map
Supplied with the System.map produced when the kernel
was built, this allows the -e option to report
unresolved symbols.
当内核建立的时候提供给System.map文件,允许-e选项报告未加分析的符号。
-n --dry-run
This sends the resulting modules.dep, then the various
map files, to standard output, rather than writing
them into the module directory.
这个参数将发送出modules.dep文件的结果,以及各种各样的映射文件的结果,发送到标准输出而不是发送到模块路径。
-A --quick
This option scans to see if any modules are newer the
modules.dep file before any work is done: if not, it
silently exits rather than regenerating the files.
这个选项扫描任何在modules.dep文件中还没有开始工作的新模块,如果没有新模块,保持文件现状,而不替换现有的modules.dep文件。
BACKWARDS COMPATIBILITY 向后兼容
This version of depmod is for kernels 2.5.48 and above. If it
detects a kernel with support for old-style modules, or the ver-
sion specified is before 2.5.48, it will attempt to run dep-
mod.old in its place, so it is completely transparent to the
user.
depmod命令支持的内核版本是2.5.48以及更老的版本,如果depmod检测出一个内核版本支持更老版本的模块或者是指定的版本在2.5.48之前的话,depmod将接受老版本,所以depmod对用户是完全透明的。
COPYRIGHT
This manual page Copyright 2002, Rusty Russell, IBM Corporation.
SEE ALSO
modprobe(8), modules.dep(5), depmod.old(8)
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