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proc: convert /proc/tty/ldiscs to seq_file interface

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Note: THIS_MODULE and header addition aren't technically needed because
      this code is not modular, but let's keep it anyway because people
      can copy this code into modular code.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2008-04-29 01:01:58 -07:00 committed by Linus Torvalds
parent 8731f14d37
commit b640a89ddd
1 changed files with 45 additions and 31 deletions
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76
fs/proc/proc_tty.c
View file

@ -5,7 +5,7 @@
*/
#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/time.h>
@ -136,39 +136,54 @@ static const struct file_operations proc_tty_drivers_operations = {
.release = seq_release,
};
/*
* This is the handler for /proc/tty/ldiscs
*/
static int tty_ldiscs_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
static void * tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
{
int i;
int len = 0;
off_t begin = 0;
return (*pos < NR_LDISCS) ? pos : NULL;
}
static void * tty_ldiscs_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
return (*pos < NR_LDISCS) ? pos : NULL;
}
static void tty_ldiscs_seq_stop(struct seq_file *m, void *v)
{
}
static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
{
int i = *(loff_t *)v;
struct tty_ldisc *ld;
for (i=0; i < NR_LDISCS; i++) {
ld = tty_ldisc_get(i);
if (ld == NULL)
continue;
len += sprintf(page+len, "%-10s %2d\n",
ld->name ? ld->name : "???", i);
tty_ldisc_put(i);
if (len+begin > off+count)
break;
if (len+begin < off) {
begin += len;
len = 0;
}
}
if (i >= NR_LDISCS)
*eof = 1;
if (off >= len+begin)
ld = tty_ldisc_get(i);
if (ld == NULL)
return 0;
*start = page + (off-begin);
return ((count < begin+len-off) ? count : begin+len-off);
seq_printf(m, "%-10s %2d\n", ld->name ? ld->name : "???", i);
tty_ldisc_put(i);
return 0;
}
static const struct seq_operations tty_ldiscs_seq_ops = {
.start = tty_ldiscs_seq_start,
.next = tty_ldiscs_seq_next,
.stop = tty_ldiscs_seq_stop,
.show = tty_ldiscs_seq_show,
};
static int proc_tty_ldiscs_open(struct inode *inode, struct file *file)
{
return seq_open(file, &tty_ldiscs_seq_ops);
}
static const struct file_operations tty_ldiscs_proc_fops = {
.owner = THIS_MODULE,
.open = proc_tty_ldiscs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
/*
* This function is called by tty_register_driver() to handle
* registering the driver's /proc handler into /proc/tty/driver/<foo>
@ -223,8 +238,7 @@ void __init proc_tty_init(void)
* password lengths and inter-keystroke timings during password
* entry.
*/
proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR | S_IXUSR, NULL);
create_proc_read_entry("tty/ldiscs", 0, NULL, tty_ldiscs_read_proc, NULL);
proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
}