3rd-party/linux-kernel-module-cheat
1
0
Fork 0
mirror of https://github.com/cirosantilli/linux-kernel-module-cheat.git synced 2026-01-23 10:15:57 +01:00
Code Issues Releases Wiki Activity

Saner seq_file example adapted from kernel doc

Browse Source
This commit is contained in:
Ciro Santilli
2017-07-14 10:31:18 +01:00
parent 8058ee9f2b
commit f82c058eb6
4 changed files with 104 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
kernel_module/seq_file_single.c
View File

@@ -1,5 +1,11 @@
/*
For single reads, single_open is an even more convenient version of seq_file.
If you have the entire read output upfront, single_open
is an even more convenient version of seq_file.
This example behaves like a file that contains:
ab
cd
*/
#include <asm/uaccess.h> /* copy_from_user, copy_to_user */
@@ -17,7 +23,7 @@ static struct dentry *debugfs_file;
static int show(struct seq_file *m, void *v)
{
seq_printf(m, "abcd\n");
seq_printf(m, "ab\ncd\n");
return 0;
}
@@ -36,8 +42,13 @@ static const struct file_operations fops = {
static int myinit(void)
{
debugfs_file = debugfs_create_file("lkmc_seq_file", S_IRUSR | S_IWUSR, NULL, NULL, &fops);
return 0;
debugfs_file = debugfs_create_file(
"lkmc_seq_file_single", S_IRUSR | S_IWUSR, NULL, NULL, &fops);
if (debugfs_file) {
return 0;
} else {
return -EINVAL;
}
}
static void myexit(void)