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31.7. Persistent Module Loading
As shown in Example 31.1, “Listing information about a kernel module with lsmod”, many kernel modules are loaded automatically at boot time. You can specify additional modules to be loaded by creating a new
<file_name>.modules file in the /etc/sysconfig/modules/ directory, where <file_name> is any descriptive name of your choice. Your <file_name>.modules files are treated by the system startup scripts as shell scripts, and as such should begin with an interpreter directive (also called a “bang line”) as their first line:
Example 31.6. First line of a file_name.modules file
#!/bin/sh
Additionally, the
<file_name>.modules file should be executable. You can make it executable by running:
modules]# chmod +x <file_name>.modules
For example, the following
bluez-uinput.modules script loads the uinput module:
Example 31.7. /etc/sysconfig/modules/bluez-uinput.modules
#!/bin/sh
if [ ! -c /dev/input/uinput ] ; then
exec /sbin/modprobe uinput >/dev/null 2>&1
fi
The
if-conditional statement on the third line ensures that the /dev/input/uinput file does not already exist (the ! symbol negates the condition), and, if that is the case, loads the uinput module by calling exec /sbin/modprobe uinput. Note that the uinput module creates the /dev/input/uinput file, so testing to see if that file exists serves as verification of whether the uinput module is loaded into the kernel.
The following
>/dev/null 2>&1 clause at the end of that line redirects any output to /dev/null so that the modprobe command remains quiet.
