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@ -18,7 +18,7 @@
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<h2 class='titleHead'>The Linux Kernel Module Programming Guide</h2>
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<div class='author'><span class='ecrm-1200'>Peter Jay Salzman, Michael Burian, Ori Pomerantz, Bob Mottram, Jim Huang</span></div><br />
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<div class='date'><span class='ecrm-1200'>October 26, 2024</span></div>
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<div class='date'><span class='ecrm-1200'>November 5, 2024</span></div>
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@ -2552,47 +2552,48 @@ accessible via sysfs is given below.
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<a id='x1-38147r42'></a><span class='ecrm-0500'>42</span>
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<a id='x1-38149r43'></a><span class='ecrm-0500'>43</span><span class='ectt-0800'> error = sysfs_create_file(mymodule, &myvariable_attribute.attr);</span>
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<a id='x1-38151r44'></a><span class='ecrm-0500'>44</span><span class='ectt-0800'> </span><span id='textcolor1027'><span class='ectt-0800'>if</span></span><span class='ectt-0800'> (error) {</span>
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<a id='x1-38153r45'></a><span class='ecrm-0500'>45</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1028'><span class='ectt-0800'>"failed to create the myvariable file "</span></span>
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<a id='x1-38155r46'></a><span class='ecrm-0500'>46</span><span class='ectt-0800'> </span><span id='textcolor1029'><span class='ectt-0800'>"in /sys/kernel/mymodule</span></span><span id='textcolor1030'><span class='ectt-0800'>\n</span></span><span id='textcolor1031'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38157r47'></a><span class='ecrm-0500'>47</span><span class='ectt-0800'> }</span>
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<a id='x1-38159r48'></a><span class='ecrm-0500'>48</span>
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<a id='x1-38161r49'></a><span class='ecrm-0500'>49</span><span class='ectt-0800'> </span><span id='textcolor1032'><span class='ectt-0800'>return</span></span><span class='ectt-0800'> error;</span>
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<a id='x1-38163r50'></a><span class='ecrm-0500'>50</span><span class='ectt-0800'>}</span>
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<a id='x1-38165r51'></a><span class='ecrm-0500'>51</span>
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<a id='x1-38167r52'></a><span class='ecrm-0500'>52</span><span id='textcolor1033'><span class='ectt-0800'>static</span></span><span class='ectt-0800'> </span><span id='textcolor1034'><span class='ectt-0800'>void</span></span><span class='ectt-0800'> __exit mymodule_exit(</span><span id='textcolor1035'><span class='ectt-0800'>void</span></span><span class='ectt-0800'>)</span>
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<a id='x1-38169r53'></a><span class='ecrm-0500'>53</span><span class='ectt-0800'>{</span>
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<a id='x1-38171r54'></a><span class='ecrm-0500'>54</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1036'><span class='ectt-0800'>"mymodule: Exit success</span></span><span id='textcolor1037'><span class='ectt-0800'>\n</span></span><span id='textcolor1038'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38173r55'></a><span class='ecrm-0500'>55</span><span class='ectt-0800'> kobject_put(mymodule);</span>
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<a id='x1-38175r56'></a><span class='ecrm-0500'>56</span><span class='ectt-0800'>}</span>
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<a id='x1-38177r57'></a><span class='ecrm-0500'>57</span>
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<a id='x1-38179r58'></a><span class='ecrm-0500'>58</span><span class='ectt-0800'>module_init(mymodule_init);</span>
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<a id='x1-38181r59'></a><span class='ecrm-0500'>59</span><span class='ectt-0800'>module_exit(mymodule_exit);</span>
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<a id='x1-38183r60'></a><span class='ecrm-0500'>60</span>
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<a id='x1-38185r61'></a><span class='ecrm-0500'>61</span><span class='ectt-0800'>MODULE_LICENSE(</span><span id='textcolor1039'><span class='ectt-0800'>"GPL"</span></span><span class='ectt-0800'>);</span></pre>
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<a id='x1-38153r45'></a><span class='ecrm-0500'>45</span><span class='ectt-0800'> kobject_put(mymodule);</span>
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<a id='x1-38155r46'></a><span class='ecrm-0500'>46</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1028'><span class='ectt-0800'>"failed to create the myvariable file "</span></span>
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<a id='x1-38157r47'></a><span class='ecrm-0500'>47</span><span class='ectt-0800'> </span><span id='textcolor1029'><span class='ectt-0800'>"in /sys/kernel/mymodule</span></span><span id='textcolor1030'><span class='ectt-0800'>\n</span></span><span id='textcolor1031'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38159r48'></a><span class='ecrm-0500'>48</span><span class='ectt-0800'> }</span>
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<a id='x1-38161r49'></a><span class='ecrm-0500'>49</span>
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<a id='x1-38163r50'></a><span class='ecrm-0500'>50</span><span class='ectt-0800'> </span><span id='textcolor1032'><span class='ectt-0800'>return</span></span><span class='ectt-0800'> error;</span>
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<a id='x1-38165r51'></a><span class='ecrm-0500'>51</span><span class='ectt-0800'>}</span>
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<a id='x1-38167r52'></a><span class='ecrm-0500'>52</span>
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<a id='x1-38169r53'></a><span class='ecrm-0500'>53</span><span id='textcolor1033'><span class='ectt-0800'>static</span></span><span class='ectt-0800'> </span><span id='textcolor1034'><span class='ectt-0800'>void</span></span><span class='ectt-0800'> __exit mymodule_exit(</span><span id='textcolor1035'><span class='ectt-0800'>void</span></span><span class='ectt-0800'>)</span>
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<a id='x1-38171r54'></a><span class='ecrm-0500'>54</span><span class='ectt-0800'>{</span>
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<a id='x1-38173r55'></a><span class='ecrm-0500'>55</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1036'><span class='ectt-0800'>"mymodule: Exit success</span></span><span id='textcolor1037'><span class='ectt-0800'>\n</span></span><span id='textcolor1038'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38175r56'></a><span class='ecrm-0500'>56</span><span class='ectt-0800'> kobject_put(mymodule);</span>
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<a id='x1-38177r57'></a><span class='ecrm-0500'>57</span><span class='ectt-0800'>}</span>
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<a id='x1-38179r58'></a><span class='ecrm-0500'>58</span>
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<a id='x1-38181r59'></a><span class='ecrm-0500'>59</span><span class='ectt-0800'>module_init(mymodule_init);</span>
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<a id='x1-38183r60'></a><span class='ecrm-0500'>60</span><span class='ectt-0800'>module_exit(mymodule_exit);</span>
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<a id='x1-38185r61'></a><span class='ecrm-0500'>61</span>
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<a id='x1-38187r62'></a><span class='ecrm-0500'>62</span><span class='ectt-0800'>MODULE_LICENSE(</span><span id='textcolor1039'><span class='ectt-0800'>"GPL"</span></span><span class='ectt-0800'>);</span></pre>
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<!-- l. 1333 --><p class='indent'> Make and install the module:
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</p><!-- l. 1 --><p class='indent'>
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</p>
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<pre class='fancyvrb' id='fancyvrb55'><a id='x1-38189r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>make</span>
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<a id='x1-38191r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo insmod hello-sysfs.ko</span></pre>
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<pre class='fancyvrb' id='fancyvrb55'><a id='x1-38191r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>make</span>
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<a id='x1-38193r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo insmod hello-sysfs.ko</span></pre>
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<!-- l. 1340 --><p class='indent'> Check that it exists:
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</p><!-- l. 1 --><p class='indent'>
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</p>
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<pre class='fancyvrb' id='fancyvrb56'><a id='x1-38194r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo lsmod | grep hello_sysfs</span></pre>
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<pre class='fancyvrb' id='fancyvrb56'><a id='x1-38196r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo lsmod | grep hello_sysfs</span></pre>
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<!-- l. 1346 --><p class='indent'> What is the current value of <code> <span class='ectt-1000'>myvariable</span>
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</code> ?
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</p><!-- l. 1 --><p class='indent'>
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</p>
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<pre class='fancyvrb' id='fancyvrb57'><a id='x1-38198r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
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<pre class='fancyvrb' id='fancyvrb57'><a id='x1-38200r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
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<!-- l. 1352 --><p class='indent'> Set the value of <code> <span class='ectt-1000'>myvariable</span>
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</code> and check that it changed.
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</p><!-- l. 1 --><p class='indent'>
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</p>
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<pre class='fancyvrb' id='fancyvrb58'><a id='x1-38203r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>echo </span><span id='textcolor1040'><span class='ectt-1000'>"32"</span></span><span class='ectt-1000'> | sudo tee /sys/kernel/mymodule/myvariable</span>
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<a id='x1-38205r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
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<pre class='fancyvrb' id='fancyvrb58'><a id='x1-38205r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>echo </span><span id='textcolor1040'><span class='ectt-1000'>"32"</span></span><span class='ectt-1000'> | sudo tee /sys/kernel/mymodule/myvariable</span>
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<a id='x1-38207r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
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<!-- l. 1359 --><p class='indent'> Finally, remove the test module:
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</p><!-- l. 1 --><p class='indent'>
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</p>
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<pre class='fancyvrb' id='fancyvrb59'><a id='x1-38208r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo rmmod hello_sysfs</span></pre>
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<pre class='fancyvrb' id='fancyvrb59'><a id='x1-38210r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo rmmod hello_sysfs</span></pre>
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@ -18,7 +18,7 @@
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<h2 class='titleHead'>The Linux Kernel Module Programming Guide</h2>
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<div class='author'><span class='ecrm-1200'>Peter Jay Salzman, Michael Burian, Ori Pomerantz, Bob Mottram, Jim Huang</span></div><br />
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<div class='date'><span class='ecrm-1200'>October 26, 2024</span></div>
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<div class='date'><span class='ecrm-1200'>November 5, 2024</span></div>
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@ -2552,47 +2552,48 @@ accessible via sysfs is given below.
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<a id='x1-38147r42'></a><span class='ecrm-0500'>42</span>
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<a id='x1-38149r43'></a><span class='ecrm-0500'>43</span><span class='ectt-0800'> error = sysfs_create_file(mymodule, &myvariable_attribute.attr);</span>
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<a id='x1-38151r44'></a><span class='ecrm-0500'>44</span><span class='ectt-0800'> </span><span id='textcolor1027'><span class='ectt-0800'>if</span></span><span class='ectt-0800'> (error) {</span>
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<a id='x1-38153r45'></a><span class='ecrm-0500'>45</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1028'><span class='ectt-0800'>"failed to create the myvariable file "</span></span>
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<a id='x1-38155r46'></a><span class='ecrm-0500'>46</span><span class='ectt-0800'> </span><span id='textcolor1029'><span class='ectt-0800'>"in /sys/kernel/mymodule</span></span><span id='textcolor1030'><span class='ectt-0800'>\n</span></span><span id='textcolor1031'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38157r47'></a><span class='ecrm-0500'>47</span><span class='ectt-0800'> }</span>
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<a id='x1-38159r48'></a><span class='ecrm-0500'>48</span>
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<a id='x1-38161r49'></a><span class='ecrm-0500'>49</span><span class='ectt-0800'> </span><span id='textcolor1032'><span class='ectt-0800'>return</span></span><span class='ectt-0800'> error;</span>
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<a id='x1-38163r50'></a><span class='ecrm-0500'>50</span><span class='ectt-0800'>}</span>
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<a id='x1-38165r51'></a><span class='ecrm-0500'>51</span>
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<a id='x1-38167r52'></a><span class='ecrm-0500'>52</span><span id='textcolor1033'><span class='ectt-0800'>static</span></span><span class='ectt-0800'> </span><span id='textcolor1034'><span class='ectt-0800'>void</span></span><span class='ectt-0800'> __exit mymodule_exit(</span><span id='textcolor1035'><span class='ectt-0800'>void</span></span><span class='ectt-0800'>)</span>
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<a id='x1-38169r53'></a><span class='ecrm-0500'>53</span><span class='ectt-0800'>{</span>
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<a id='x1-38171r54'></a><span class='ecrm-0500'>54</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1036'><span class='ectt-0800'>"mymodule: Exit success</span></span><span id='textcolor1037'><span class='ectt-0800'>\n</span></span><span id='textcolor1038'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38173r55'></a><span class='ecrm-0500'>55</span><span class='ectt-0800'> kobject_put(mymodule);</span>
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<a id='x1-38175r56'></a><span class='ecrm-0500'>56</span><span class='ectt-0800'>}</span>
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<a id='x1-38177r57'></a><span class='ecrm-0500'>57</span>
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<a id='x1-38179r58'></a><span class='ecrm-0500'>58</span><span class='ectt-0800'>module_init(mymodule_init);</span>
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<a id='x1-38181r59'></a><span class='ecrm-0500'>59</span><span class='ectt-0800'>module_exit(mymodule_exit);</span>
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<a id='x1-38183r60'></a><span class='ecrm-0500'>60</span>
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<a id='x1-38185r61'></a><span class='ecrm-0500'>61</span><span class='ectt-0800'>MODULE_LICENSE(</span><span id='textcolor1039'><span class='ectt-0800'>"GPL"</span></span><span class='ectt-0800'>);</span></pre>
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<a id='x1-38153r45'></a><span class='ecrm-0500'>45</span><span class='ectt-0800'> kobject_put(mymodule);</span>
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<a id='x1-38155r46'></a><span class='ecrm-0500'>46</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1028'><span class='ectt-0800'>"failed to create the myvariable file "</span></span>
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<a id='x1-38157r47'></a><span class='ecrm-0500'>47</span><span class='ectt-0800'> </span><span id='textcolor1029'><span class='ectt-0800'>"in /sys/kernel/mymodule</span></span><span id='textcolor1030'><span class='ectt-0800'>\n</span></span><span id='textcolor1031'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
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<a id='x1-38159r48'></a><span class='ecrm-0500'>48</span><span class='ectt-0800'> }</span>
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<a id='x1-38161r49'></a><span class='ecrm-0500'>49</span>
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<a id='x1-38163r50'></a><span class='ecrm-0500'>50</span><span class='ectt-0800'> </span><span id='textcolor1032'><span class='ectt-0800'>return</span></span><span class='ectt-0800'> error;</span>
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<a id='x1-38165r51'></a><span class='ecrm-0500'>51</span><span class='ectt-0800'>}</span>
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<a id='x1-38167r52'></a><span class='ecrm-0500'>52</span>
|
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<a id='x1-38169r53'></a><span class='ecrm-0500'>53</span><span id='textcolor1033'><span class='ectt-0800'>static</span></span><span class='ectt-0800'> </span><span id='textcolor1034'><span class='ectt-0800'>void</span></span><span class='ectt-0800'> __exit mymodule_exit(</span><span id='textcolor1035'><span class='ectt-0800'>void</span></span><span class='ectt-0800'>)</span>
|
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<a id='x1-38171r54'></a><span class='ecrm-0500'>54</span><span class='ectt-0800'>{</span>
|
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<a id='x1-38173r55'></a><span class='ecrm-0500'>55</span><span class='ectt-0800'> pr_info(</span><span id='textcolor1036'><span class='ectt-0800'>"mymodule: Exit success</span></span><span id='textcolor1037'><span class='ectt-0800'>\n</span></span><span id='textcolor1038'><span class='ectt-0800'>"</span></span><span class='ectt-0800'>);</span>
|
||||
<a id='x1-38175r56'></a><span class='ecrm-0500'>56</span><span class='ectt-0800'> kobject_put(mymodule);</span>
|
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<a id='x1-38177r57'></a><span class='ecrm-0500'>57</span><span class='ectt-0800'>}</span>
|
||||
<a id='x1-38179r58'></a><span class='ecrm-0500'>58</span>
|
||||
<a id='x1-38181r59'></a><span class='ecrm-0500'>59</span><span class='ectt-0800'>module_init(mymodule_init);</span>
|
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<a id='x1-38183r60'></a><span class='ecrm-0500'>60</span><span class='ectt-0800'>module_exit(mymodule_exit);</span>
|
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<a id='x1-38185r61'></a><span class='ecrm-0500'>61</span>
|
||||
<a id='x1-38187r62'></a><span class='ecrm-0500'>62</span><span class='ectt-0800'>MODULE_LICENSE(</span><span id='textcolor1039'><span class='ectt-0800'>"GPL"</span></span><span class='ectt-0800'>);</span></pre>
|
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<!-- l. 1333 --><p class='indent'> Make and install the module:
|
||||
</p><!-- l. 1 --><p class='indent'>
|
||||
</p>
|
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<pre class='fancyvrb' id='fancyvrb55'><a id='x1-38189r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>make</span>
|
||||
<a id='x1-38191r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo insmod hello-sysfs.ko</span></pre>
|
||||
<pre class='fancyvrb' id='fancyvrb55'><a id='x1-38191r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>make</span>
|
||||
<a id='x1-38193r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo insmod hello-sysfs.ko</span></pre>
|
||||
<!-- l. 1340 --><p class='indent'> Check that it exists:
|
||||
</p><!-- l. 1 --><p class='indent'>
|
||||
</p>
|
||||
<pre class='fancyvrb' id='fancyvrb56'><a id='x1-38194r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo lsmod | grep hello_sysfs</span></pre>
|
||||
<pre class='fancyvrb' id='fancyvrb56'><a id='x1-38196r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo lsmod | grep hello_sysfs</span></pre>
|
||||
<!-- l. 1346 --><p class='indent'> What is the current value of <code> <span class='ectt-1000'>myvariable</span>
|
||||
</code> ?
|
||||
</p><!-- l. 1 --><p class='indent'>
|
||||
</p>
|
||||
<pre class='fancyvrb' id='fancyvrb57'><a id='x1-38198r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
|
||||
<pre class='fancyvrb' id='fancyvrb57'><a id='x1-38200r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
|
||||
<!-- l. 1352 --><p class='indent'> Set the value of <code> <span class='ectt-1000'>myvariable</span>
|
||||
</code> and check that it changed.
|
||||
</p><!-- l. 1 --><p class='indent'>
|
||||
</p>
|
||||
<pre class='fancyvrb' id='fancyvrb58'><a id='x1-38203r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>echo </span><span id='textcolor1040'><span class='ectt-1000'>"32"</span></span><span class='ectt-1000'> | sudo tee /sys/kernel/mymodule/myvariable</span>
|
||||
<a id='x1-38205r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
|
||||
<pre class='fancyvrb' id='fancyvrb58'><a id='x1-38205r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>echo </span><span id='textcolor1040'><span class='ectt-1000'>"32"</span></span><span class='ectt-1000'> | sudo tee /sys/kernel/mymodule/myvariable</span>
|
||||
<a id='x1-38207r2'></a><span class='ecrm-0500'>2</span><span class='ectt-1000'>sudo cat /sys/kernel/mymodule/myvariable</span></pre>
|
||||
<!-- l. 1359 --><p class='indent'> Finally, remove the test module:
|
||||
</p><!-- l. 1 --><p class='indent'>
|
||||
</p>
|
||||
<pre class='fancyvrb' id='fancyvrb59'><a id='x1-38208r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo rmmod hello_sysfs</span></pre>
|
||||
<pre class='fancyvrb' id='fancyvrb59'><a id='x1-38210r1'></a><span class='ecrm-0500'>1</span><span class='ectt-1000'>sudo rmmod hello_sysfs</span></pre>
|
||||
|
||||
|
||||
|
||||
|
||||
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Reference in New Issue
Block a user