intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 56 insertions, 0 deletions

diff --git a/contrib/libs/libaio/io_getevents.c b/contrib/libs/libaio/io_getevents.c
new file mode 100644
index 00000000000..b606e43283a
--- /dev/null
+++ b/contrib/libs/libaio/io_getevents.c
@@ -0,0 +1,56 @@
+/* io_getevents.c
+   libaio Linux async I/O interface
+   Copyright 2002 Red Hat, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ */
+#include "libaio.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <time.h>
+#include "syscall.h"
+
+io_syscall5(int, __io_getevents_0_4, io_getevents, io_context_t, ctx, long, min_nr, long, nr, struct io_event *, events, struct timespec *, timeout)
+
+#define AIO_RING_MAGIC                  0xa10a10a1
+
+/* Ben will hate me for this */
+struct aio_ring {
+	unsigned        id;     /* kernel internal index number */
+	unsigned        nr;     /* number of io_events */
+	unsigned        head;
+	unsigned        tail;
+
+	unsigned        magic;
+	unsigned        compat_features;
+	unsigned        incompat_features;
+	unsigned        header_length;  /* size of aio_ring */
+};
+
+
+int io_getevents(io_context_t ctx, long min_nr, long nr, struct io_event * events, struct timespec * timeout)
+{
+	struct aio_ring *ring;
+	ring = (struct aio_ring*)ctx;
+	if (ring==NULL || ring->magic != AIO_RING_MAGIC)
+		goto do_syscall;
+	if (timeout!=NULL && timeout->tv_sec == 0 && timeout->tv_nsec == 0) {
+		if (ring->head == ring->tail)
+			return 0;
+	}
+
+do_syscall:
+	return __io_getevents_0_4(ctx, min_nr, nr, events, timeout);
+}