87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
#include "monitor_proc.h"
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#include <linux/kernel.h>
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#include <linux/proc_fs.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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const char* proc_dir = "variable_monitor";
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int def_interval_ns = DEFAULT_INTERVAL_NS;
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int dump_reset_sec = DEFAULT_DUMP_RESET_SEC;
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static ssize_t read_proc(struct file *file, char __user *buf, size_t count,
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loff_t *offset, int *var) {
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char temp_buf[32];
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size_t len = sprintf(temp_buf, "%d\n", *var);
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return simple_read_from_buffer(buf, count, offset, temp_buf, len);
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}
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static ssize_t write_proc(struct file *file, const char __user *buf,
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size_t count, loff_t *offset, int *var) {
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char temp_buf[32];
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if (count > sizeof(temp_buf) - 1)
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return -EINVAL;
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if (copy_from_user(temp_buf, buf, count))
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return -EFAULT;
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temp_buf[count] = '\0';
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sscanf(temp_buf, "%d", var);
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return count;
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}
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static ssize_t read_proc_def_interval_ns(struct file *file, char __user *buf,
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size_t count, loff_t *offset) {
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return read_proc(file, buf, count, offset, &def_interval_ns);
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}
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static ssize_t read_proc_dump_reset_sec(struct file *file, char __user *buf,
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size_t count, loff_t *offset) {
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return read_proc(file, buf, count, offset, &dump_reset_sec);
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}
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static ssize_t write_proc_def_interval_ns(struct file *file,
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const char __user *buf, size_t count,
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loff_t *offset) {
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return write_proc(file, buf, count, offset, &def_interval_ns);
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}
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static ssize_t write_proc_dump_reset_sec(struct file *file,
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const char __user *buf, size_t count,
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loff_t *offset) {
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return write_proc(file, buf, count, offset, &dump_reset_sec);
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}
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static const struct proc_ops proc_def_interval_ns_ops = {
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.proc_read = read_proc_def_interval_ns,
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.proc_write = write_proc_def_interval_ns,
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};
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static const struct proc_ops proc_dump_reset_sec_ops = {
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.proc_read = read_proc_dump_reset_sec,
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.proc_write = write_proc_dump_reset_sec,
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};
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int monitor_proc_init(void) {
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struct proc_dir_entry *dir;
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dir = proc_mkdir(proc_dir, NULL);
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if (!dir) {
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pr_err("variable_monitor: failed to create /proc directory\n");
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return -ENOMEM;
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}
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proc_create("def_interval_ns", 0666, dir, &proc_def_interval_ns_ops);
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proc_create("dump_reset_sec", 0666, dir, &proc_dump_reset_sec_ops);
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return 0;
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}
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int monitor_proc_exit(void) {
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// remove_proc_entry("def_interval_ns", NULL);
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// remove_proc_entry("dump_reset_sec", NULL);
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remove_proc_subtree(proc_dir, NULL);
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return 0;
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} |