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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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dae60aa248
Then inside, split packages/lkmc into kernel_modules and userland, to keep userland out of the kernel_modules parent path, which makes no sense. Copy built modules and userland to the output rootfs overlay. Document Linux distro tradeoffs.
40 lines
869 B
C
40 lines
869 B
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#timers */
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/timer.h>
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static int i;
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/* We would normally mark this as static and give it a more generic name.
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* But let's do it like this this time for the sake of our GDB kernel module step debugging example. */
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void lkmc_timer_callback(struct timer_list *data);
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static unsigned long onesec;
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DEFINE_TIMER(mytimer, lkmc_timer_callback);
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void lkmc_timer_callback(struct timer_list *data)
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{
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pr_info("%d\n", i);
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i++;
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if (i == 10)
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i = 0;
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mod_timer(&mytimer, jiffies + onesec);
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}
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static int myinit(void)
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{
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onesec = msecs_to_jiffies(1000);
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mod_timer(&mytimer, jiffies + onesec);
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return 0;
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}
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static void myexit(void)
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{
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del_timer(&mytimer);
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}
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module_init(myinit)
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module_exit(myexit)
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MODULE_LICENSE("GPL");
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