MODLOAD(8)              NetBSD System Manager's Manual              MODLOAD(8)

     modload - load a kernel module

     modload [-dnvsS] [-A kernel] [-e entry] [-p postinstall] [-o output_file]

     The modload utility loads a loadable kernel module into a running system.
     The input file is an object file (.o file).

     The options to modload are as follows:

     -d      Debug.  Used to debug modload itself.

     -n      Do everything, except calling the module entry point (and any
             post-install program).

     -v      Print comments about the loading process.

     -s      Load the symbol table.

     -S      Do not remove the temporary object file.  By default, the ld(1)
             output is removed after being loaded into the kernel.

     -A kernel
             Specify the file that is passed to the linker to resolve module
             references to external symbols.  The symbol file must be for the
             currently running kernel or the module is likely to crash the

     -e entry
             Specify the module entry point.  This is passed by modload to
             ld(1) when the module is linked.  The default module entry point
             name is `xxxinit'. If `xxxinit' cannot be found, an attempt to
             use `<module_name>_lkmentry' will be made, where <module_name> is
             the filename being loaded without the `.o'.

     -p postinstall
             Specify the name of a shell script or program that will be exe-
             cuted if the module is successfully loaded. It is always passed
             the module id (in decimal) and module type (in hexadecimal) as
             the first two arguments.  For loadable drivers, the third argu-
             ment is the block or character major device number.  For a load-
             able system call, the third argument is the system call number.

     -o output_file
             Specify the name of the output file that is produced by the link-

     /netbsd                 default file passed to the linker to resolve ex-
                             ternal references in the module
     /usr/include/sys/lkm.h  file containing definitions of module types

     The modload utility exits with a status of 0 on success and with a nonze-
     ro status if an error occurs.

     ld(1), lkm(4), modstat(8), modunload(8)

     The modload command was designed to be similar in functionality to the
     corresponding command in SunOS 4.1.3.

     Terrence R. Lambert <>

     +   The loadable device driver framework can only reserve either a char-
         acter or block device entry, not both.

     +   Loading the symbol table is expensive in terms of space: it presently
         duplicates all the kernel symbols for each lkm loaded with -s.

NetBSD 1.6                      April 30, 1999                               2

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