1 files changed, 100 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 69078c7cef1f..a19308604145 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -86,6 +86,7 @@
 #include <linux/fs_struct.h>
 #include <linux/slab.h>
 #include <linux/flex_array.h>
+#include <linux/posix-timers.h>
 #ifdef CONFIG_HARDWALL
 #include <asm/hardwall.h>
 #endif
@@ -2013,6 +2014,102 @@ static const struct file_operations proc_map_files_operations = {
         .llseek         = default_llseek,
 };
 
+struct timers_private {
+        struct pid *pid;
+        struct task_struct *task;
+        struct sighand_struct *sighand;
+        struct pid_namespace *ns;
+        unsigned long flags;
+};
+
+static void *timers_start(struct seq_file *m, loff_t *pos)
+{
+        struct timers_private *tp = m->private;
+
+        tp->task = get_pid_task(tp->pid, PIDTYPE_PID);
+        if (!tp->task)
+                return ERR_PTR(-ESRCH);
+
+        tp->sighand = lock_task_sighand(tp->task, &tp->flags);
+        if (!tp->sighand)
+                return ERR_PTR(-ESRCH);
+
+        return seq_list_start(&tp->task->signal->posix_timers, *pos);
+}
+
+static void *timers_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct timers_private *tp = m->private;
+        return seq_list_next(v, &tp->task->signal->posix_timers, pos);
+}
+
+static void timers_stop(struct seq_file *m, void *v)
+{
+        struct timers_private *tp = m->private;
+
+        if (tp->sighand) {
+                unlock_task_sighand(tp->task, &tp->flags);
+                tp->sighand = NULL;
+        }
+
+        if (tp->task) {
+                put_task_struct(tp->task);
+                tp->task = NULL;
+        }
+}
+
+static int show_timer(struct seq_file *m, void *v)
+{
+        struct k_itimer *timer;
+        struct timers_private *tp = m->private;
+        int notify;
+        static char *nstr[] = {
+                [SIGEV_SIGNAL] = "signal",
+                [SIGEV_NONE] = "none",
+                [SIGEV_THREAD] = "thread",
+        };
+
+        timer = list_entry((struct list_head *)v, struct k_itimer, list);
+        notify = timer->it_sigev_notify;
+
+        seq_printf(m, "ID: %d\n", timer->it_id);
+        seq_printf(m, "signal: %d/%p\n", timer->sigq->info.si_signo,
+                        timer->sigq->info.si_value.sival_ptr);
+        seq_printf(m, "notify: %s/%s.%d\n",
+                nstr[notify & ~SIGEV_THREAD_ID],
+                (notify & SIGEV_THREAD_ID) ? "tid" : "pid",
+                pid_nr_ns(timer->it_pid, tp->ns));
+
+        return 0;
+}
+
+static const struct seq_operations proc_timers_seq_ops = {
+        .start  = timers_start,
+        .next   = timers_next,
+        .stop   = timers_stop,
+        .show   = show_timer,
+};
+
+static int proc_timers_open(struct inode *inode, struct file *file)
+{
+        struct timers_private *tp;
+
+        tp = __seq_open_private(file, &proc_timers_seq_ops,
+                        sizeof(struct timers_private));
+        if (!tp)
+                return -ENOMEM;
+
+        tp->pid = proc_pid(inode);
+        tp->ns = inode->i_sb->s_fs_info;
+        return 0;
+}
+
+static const struct file_operations proc_timers_operations = {
+        .open           = proc_timers_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
 #endif /* CONFIG_CHECKPOINT_RESTORE */
 
 static struct dentry *proc_pident_instantiate(struct inode *dir,
@@ -2583,6 +2680,9 @@ static const struct pid_entry tgid_base_stuff[] = {
         REG("gid_map",    S_IRUGO|S_IWUSR, proc_gid_map_operations),
         REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
 #endif
+#ifdef CONFIG_CHECKPOINT_RESTORE
+        REG("timers",     S_IRUGO, proc_timers_operations),
+#endif
 };
 
 static int proc_tgid_base_readdir(struct file * filp,