signal/timer/event: timerfd compat code

This patch implements the necessary compat code for the timerfd system call.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 2487b83b18df..7b21b0a82596 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -2225,3 +2225,26 @@ asmlinkage long compat_sys_signalfd(int ufd,
 
 #endif /* CONFIG_SIGNALFD */
 
+#ifdef CONFIG_TIMERFD
+
+asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
+                                   const struct compat_itimerspec __user *utmr)
+{
+        long res;
+        struct itimerspec t;
+        struct itimerspec __user *ut;
+
+        res = -EFAULT;
+        if (get_compat_itimerspec(&t, utmr))
+                goto err_exit;
+        ut = compat_alloc_user_space(sizeof(*ut));
+        if (copy_to_user(ut, &t, sizeof(t)) )
+                goto err_exit;
+
+        res = sys_timerfd(ufd, clockid, flags, ut);
+err_exit:
+        return res;
+}
+
+#endif /* CONFIG_TIMERFD */
+