mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-13 20:12:26 +00:00
56738a1c70
Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it breaks bisects at several points. All bugs will not bisect to this humongous change. It all started with a conversion of the Bash scripts to Python, mainly because I couldn't stand not being able to properly use --options for run which has a million options. Then since that required a full testing, I decided to do all the refactorings that I had in mind at once, and so I did and it became v2-rc. This is the largest patch I have ever done! OMG a few weeks of extra time. I'm never writing a Bash script for anything that starts getting big again. Some of the features are: * separate build-qemu and build-gem5 commands * common: convert scripts to python. Add --option for everything * rename build to build-buildroot now that we are splitting all the build commands, Linux kernel to follow * move all git submodules to submodules/ and all buildroot packages to packages/ * refactor the out/ structure. Keep projects on toplevel, because guest projects separate archs and host ones don't, making a toplevel arch wrong * do-release: rename to just release https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it * run: add --terminal and explain gem5 pdb * just track the lvimrc * store CLI kernel config fragment inside buildlroot to avoid conflicts * gem5: document m5 initparam * readme: make a bunch of things awesomer * readme: fix broken refs * parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c Could not fetch otherwise. * gem5: M5_OVERRIDE_PY_SOURCE
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#anonymous-inode */
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#include <linux/anon_inodes.h>
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#include <linux/debugfs.h>
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#include <linux/errno.h> /* EFAULT */
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#include <linux/fs.h>
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#include <linux/kernel.h> /* min */
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#include <linux/module.h>
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#include <linux/printk.h> /* printk */
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#include <linux/uaccess.h> /* copy_from_user */
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#include "anonymous_inode.h"
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static struct dentry *debugfs_file;
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static u32 myval = 1;
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static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off)
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{
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char kbuf[9];
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size_t ret;
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ret = snprintf(kbuf, sizeof(kbuf), "%x", myval);
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if (copy_to_user(buf, kbuf, ret)) {
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ret = -EFAULT;
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}
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myval <<= 4;
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if (myval == 0) {
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myval = 1;
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}
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return ret;
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}
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static const struct file_operations fops_anon = {
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.read = read,
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};
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static long unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long argp)
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{
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int fd;
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switch (cmd) {
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case LKMC_ANONYMOUS_INODE_GET_FD:
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fd = anon_inode_getfd(
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"todo_what_is_this_for",
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&fops_anon,
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NULL,
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O_RDONLY | O_CLOEXEC
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);
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if (copy_to_user((void __user *)argp, &fd, sizeof(fd))) {
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return -EFAULT;
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}
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break;
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default:
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return -EINVAL;
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break;
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}
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return 0;
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}
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static const struct file_operations fops_ioctl = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = unlocked_ioctl
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};
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static int myinit(void)
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{
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debugfs_file = debugfs_create_file("lkmc_anonymous_inode", 0, NULL, NULL, &fops_ioctl);
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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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debugfs_remove(debugfs_file);
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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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