115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#define NAME_SIZE 20
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struct identity {
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struct list_head list;
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char name[NAME_SIZE];
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int id;
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bool busy;
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};
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static struct list_head identity_list;
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static int identity_create(char *name, int id)
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{
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int ret = 0;
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struct identity *new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new) {
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ret = -ENOMEM;
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} else {
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ssize_t name_len = strlen(name) + 1;
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if (name_len > NAME_SIZE) {
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ret = -EINVAL;
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} else {
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strscpy(new->name, name, name_len);
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new->id = id;
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new->busy = false;
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list_add_tail(&new->list, &identity_list);
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}
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}
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return ret;
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}
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static struct identity *identity_find(int id)
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{
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struct identity *ret = NULL;
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struct identity *tmp = NULL;
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struct list_head *list = &identity_list;
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do {
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tmp = list_entry(list, struct identity, list);
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if (tmp->id == id)
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ret = tmp;
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else
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list = tmp->list.next;
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} while (list != &identity_list && !ret);
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return ret;
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}
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static void identity_destroy(int id)
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{
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struct identity *tmp = identity_find(id);
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if (tmp) {
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list_del(&tmp->list);
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kfree(tmp);
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}
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}
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static int __init my_init(void)
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{
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struct identity *temp;
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pr_info("Coucou le gens !!!!\n");
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INIT_LIST_HEAD(&identity_list);
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if (identity_create("Alice", 1))
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pr_info("Alice n'a pas été créée.");
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if (identity_create("Bob", 2))
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pr_info("Bob n'a pas été créée.");
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if (identity_create("Dave", 3))
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pr_info("Dave n'a pas été créée.");
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if (identity_create("Gena", 10))
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pr_info("Gena n'a pas été créée.");
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temp = identity_find(3);
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if (!temp)
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pr_info("id 3 not found\n");
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else
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pr_info("id 3 = %s\n", temp->name);
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temp = identity_find(42);
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if (!temp)
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pr_info("id 42 not found\n");
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identity_destroy(2);
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identity_destroy(1);
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identity_destroy(10);
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identity_destroy(42);
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identity_destroy(3);
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return 0;
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}
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static void __exit my_exit(void)
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{
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pr_info("Tschuss !!!\n");
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}
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module_init(my_init);
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module_exit(my_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("rick <rick@gnous.eu>");
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MODULE_DESCRIPTION("Simple liste chainée.");
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