Klagarge/MSE-CSEL
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fix(lab03): ex3 read and write fop

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This commit is contained in:
fastium
2026-04-02 22:02:48 +02:00
parent 263b5c203e
commit ff22715a6b
1 changed files with 6 additions and 14 deletions
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20
src/02-driver/character-oriented/skeleton.c
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@@ -75,15 +75,12 @@ ssize_t skeleton_read(struct file* f, char* __user buf, size_t count, loff_t* of
pr_info("Read file\n");
ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
if (len > count) {
pr_info("Cannot read data for length: %ld\n", len);
return 0;
if (*off >= BUFFER_SIZE) {
return 0; // End of the file
}
ssize_t len = min((size_t)(BUFFER_SIZE - *off), count);
/* read data from my_data->buffer to user buffer */
if (copy_to_user(buf, f->private_data + *off, len)) {
pr_info("Failed to copy to user space buffer\n");
return -EFAULT;
@@ -91,28 +88,23 @@ ssize_t skeleton_read(struct file* f, char* __user buf, size_t count, loff_t* of
*off += len;
return len;
}
ssize_t skeleton_write(struct file* f, const char* __user buf, size_t count, loff_t* off) {
pr_info("Write file\n");
ssize_t len = min(BUFFER_SIZE - ((size_t)*off), count);
if (len < 0) {
pr_info("Cannot write data for length: %ld\n", len);
return 0;
if (*off >= BUFFER_SIZE) {
return -ENOSPC; // No more space in buffer
}
ssize_t len = min((size_t)(BUFFER_SIZE - *off), count);
/* read data from user buffer to my_data->buffer */
if (copy_from_user(f->private_data + *off, buf, len)) {
pr_info("Failed to copy from user space buffer\n");
return -EFAULT;
}
*off += len;
return len;
}