[Devel] [RFC PATCH 5/6] IPC/sem: .show operation for /proc/pid/semundo

[Nadia.Derbey at bull.net]

PATCH [05/06]

This patch introduces the .show seq operation for /proc/pid/semundo.


Signed-off-by: Pierre Peiffer <pierre.peiffer at bull.net>
Signed-off-by: Nadia Derbey <Nadia.Derbey at bull.net>

---
 ipc/sem.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Index: linux-2.6.26-rc5-mm3/ipc/sem.c
===================================================================
--- linux-2.6.26-rc5-mm3.orig/ipc/sem.c	2008-06-24 12:54:40.000000000 +0200
+++ linux-2.6.26-rc5-mm3/ipc/sem.c	2008-06-24 12:59:15.000000000 +0200
@@ -1475,6 +1475,34 @@ static void semundo_stop(struct seq_file
 
 static int semundo_show(struct seq_file *m, void *v)
 {
+	struct undo_list_data *data = m->private;
+	struct ipc_namespace *ns = data->ipc_ns;
+	struct sem_undo	*u = v;
+	int nsems, i;
+	struct sem_array *sma;
+
+	/*
+	 * This semid has been deleted, ignore it.
+	 * Even if we skipped all sem_undo belonging to deleted semid
+	 * in semundo_next(), some more deletions may have happened.
+	 */
+	if (u->semid == -1)
+		return 0;
+
+	seq_printf(m, "%10d", u->semid);
+
+	sma = sem_lock(ns, u->semid);
+	if (IS_ERR(sma))
+		goto out;
+
+	nsems = sma->sem_nsems;
+	sem_unlock(sma);
+
+	for (i = 0; i < nsems; i++)
+		seq_printf(m, " %6d", u->semadj[i]);
+
+out:
+	seq_putc(m, '\n');
 	return 0;
 }
 

--
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