switch epoll_pwait to COMPAT_SYSCALL_DEFINE
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 9fec183..495d155 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -40,6 +40,7 @@
#include <linux/atomic.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/compat.h>
/*
* LOCKING:
@@ -1940,6 +1941,52 @@
return error;
}
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
+ struct epoll_event __user *, events,
+ int, maxevents, int, timeout,
+ const compat_sigset_t __user *, sigmask,
+ compat_size_t, sigsetsize)
+{
+ long err;
+ compat_sigset_t csigmask;
+ sigset_t ksigmask, sigsaved;
+
+ /*
+ * If the caller wants a certain signal mask to be set during the wait,
+ * we apply it here.
+ */
+ if (sigmask) {
+ if (sigsetsize != sizeof(compat_sigset_t))
+ return -EINVAL;
+ if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
+ return -EFAULT;
+ sigset_from_compat(&ksigmask, &csigmask);
+ sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
+ sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
+ }
+
+ err = sys_epoll_wait(epfd, events, maxevents, timeout);
+
+ /*
+ * If we changed the signal mask, we need to restore the original one.
+ * In case we've got a signal while waiting, we do not restore the
+ * signal mask yet, and we allow do_signal() to deliver the signal on
+ * the way back to userspace, before the signal mask is restored.
+ */
+ if (sigmask) {
+ if (err == -EINTR) {
+ memcpy(¤t->saved_sigmask, &sigsaved,
+ sizeof(sigsaved));
+ set_restore_sigmask();
+ } else
+ sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+ }
+
+ return err;
+}
+#endif
+
static int __init eventpoll_init(void)
{
struct sysinfo si;