posix-timers: Introduce /proc/PID/timers file

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 69078c7..01def9f 100644 (file)
--- 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 +2014,85 @@ 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;
+       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;
+
+       timer = list_entry((struct list_head *)v, struct k_itimer, list);
+       seq_printf(m, "ID: %d\n", timer->it_id);
+
+       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);
+       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 +2663,9 @@ 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,