[Xenomai-core] [PATCH 17/23] native: convert the proc entry for the semaphore registry to seq_file

[Jan Kiszka]

From: Wolfgang Mauerer <wolfgang.maue...@siemens.com>

Signed-off-by: Wolfgang Mauerer <wolfgang.maue...@siemens.com>
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
 ksrc/skins/native/sem.c |   38 ++++++++++++++++++++------------------
 1 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/ksrc/skins/native/sem.c b/ksrc/skins/native/sem.c
index 0afea09..f962966 100644
--- a/ksrc/skins/native/sem.c
+++ b/ksrc/skins/native/sem.c
@@ -50,20 +50,18 @@
 
 #ifdef CONFIG_PROC_FS
 
-static int __sem_read_proc(char *page,
-                          char **start,
-                          off_t off, int count, int *eof, void *data)
+#include <linux/seq_file.h>
+
+static int sem_seq_show(struct seq_file *f, void *v)
 {
-       RT_SEM *sem = (RT_SEM *)data;
-       char *p = page;
-       int len;
+       RT_SEM *sem = (RT_SEM *)f->private;
        spl_t s;
 
        xnlock_get_irqsave(&nklock, s);
 
        if (xnsynch_nsleepers(&sem->synch_base) == 0)
                /* Idle/posted semaphore -- dump count. */
-               p += sprintf(p, "=%lu\n", sem->count);
+               seq_printf(f, "=%lu\n", sem->count);
        else {
                xnpholder_t *holder;
 
@@ -73,7 +71,7 @@ static int __sem_read_proc(char *page,
 
                while (holder) {
                        xnthread_t *sleeper = link2thread(holder, plink);
-                       p += sprintf(p, "+%s\n", xnthread_name(sleeper));
+                       seq_printf(f, "+%s\n", xnthread_name(sleeper));
                        holder =
                            nextpq(xnsynch_wait_queue(&sem->synch_base),
                                   holder);
@@ -82,18 +80,21 @@ static int __sem_read_proc(char *page,
 
        xnlock_put_irqrestore(&nklock, s);
 
-       len = (p - page) - off;
-       if (len <= off + count)
-               *eof = 1;
-       *start = page + off;
-       if (len > count)
-               len = count;
-       if (len < 0)
-               len = 0;
+       return 0;
+}
 
-       return len;
+static int sem_seq_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, sem_seq_show, PDE(inode)->data);
 }
 
+static struct file_operations sem_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = sem_seq_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+};
+
 extern xnptree_t __native_ptree;
 
 static xnpnode_t __sem_pnode = {
@@ -101,8 +102,9 @@ static xnpnode_t __sem_pnode = {
        .dir = NULL,
        .type = "semaphores",
        .entries = 0,
-       .read_proc = &__sem_read_proc,
+       .read_proc = NULL,
        .write_proc = NULL,
+       .fops = &sem_proc_fops,
        .root = &__native_ptree,
 };
 
-- 
1.6.0.2


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