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This commit is contained in:
Florian RICHER 2025-02-23 13:14:54 +01:00
parent 43032964c3
commit 510a41cbb3
Signed by: florian.richer
GPG key ID: C73D37CBED7BFC77
6 changed files with 80 additions and 78 deletions
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76
03_character_device/test_module.c
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@ -16,62 +16,62 @@ static ssize_t device_read(struct file *, char *, size_t, loff_t *);
static ssize_t device_write(struct file *, const char *, size_t, loff_t *);
static struct file_operations fops = {
.read = device_read,
.write = device_write,
.open = device_open,
.release = device_release,
.read = device_read,
.write = device_write,
.open = device_open,
.release = device_release,
};
static int __init basic_module_init(void) {
pr_info("Bonjour! Le module est chargé.\n");
major_number = register_chrdev(0, DEVICE_NAME, &fops);
if (major_number < 0) {
pr_info("Erreur lors de l'enregistrement du périphérique de caractère\n");
return major_number;
}
pr_info("Périphérique de caractère enregistré avec le numéro de majeur %d\n", major_number);
return 0;
pr_info("Bonjour! Le module est chargé.\n");
major_number = register_chrdev(0, DEVICE_NAME, &fops);
if (major_number < 0) {
pr_info("Erreur lors de l'enregistrement du périphérique de caractère\n");
return major_number;
}
pr_info("Périphérique de caractère enregistré avec le numéro de majeur %d\n", major_number);
return 0;
}
static void __exit basic_module_exit(void) {
unregister_chrdev(major_number, DEVICE_NAME);
pr_info("Au revoir! Le module est déchargé.\n");
unregister_chrdev(major_number, DEVICE_NAME);
pr_info("Au revoir! Le module est déchargé.\n");
}
static int device_open(struct inode *inode, struct file *file) {
pr_info("flodev - Ouverture du périphérique\n");
return 0;
pr_info("flodev - Ouverture du périphérique\n");
return 0;
}
static int device_release(struct inode *inode, struct file *file) {
pr_info("flodev - Fermeture du périphérique\n");
return 0;
pr_info("flodev - Fermeture du périphérique\n");
return 0;
}
static ssize_t device_read(struct file *filp, char *buffer, size_t length, loff_t *offset) {
int bytes_read = 0;
if (*offset >= size_of_msg) {
return 0;
}
if (*offset + length > size_of_msg) {
length = size_of_msg - *offset;
}
if (copy_to_user(buffer, msg + *offset, length)) {
return -EFAULT;
}
*offset += length;
bytes_read = length;
pr_info("flodev - Lecture de %d bytes\n", bytes_read);
return bytes_read;
int bytes_read = 0;
if (*offset >= size_of_msg) {
return 0;
}
if (*offset + length > size_of_msg) {
length = size_of_msg - *offset;
}
if (copy_to_user(buffer, msg + *offset, length)) {
return -EFAULT;
}
*offset += length;
bytes_read = length;
pr_info("flodev - Lecture de %d bytes\n", bytes_read);
return bytes_read;
}
static ssize_t device_write(struct file *filp, const char *buff, size_t len, loff_t *off) {
if (copy_from_user(msg, buff, len)) {
return -EFAULT;
}
size_of_msg = len;
pr_info("flodev - Message reçu: %s\n", msg);
return len;
if (copy_from_user(msg, buff, len)) {
return -EFAULT;
}
size_of_msg = len;
pr_info("flodev - Message reçu: %s\n", msg);
return len;
}
module_init(basic_module_init);