diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index 87ed3db67..20fb6a3d1 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -317,6 +317,8 @@ bool init_functionfs(struct usb_handle* h) {
         goto err;
     }
 
+    memset(&h->read_aiob.ctx, 0, sizeof(h->read_aiob.ctx));
+    memset(&h->write_aiob.ctx, 0, sizeof(h->write_aiob.ctx));
     if (io_setup(USB_FFS_NUM_BUFS, &h->read_aiob.ctx) ||
         io_setup(USB_FFS_NUM_BUFS, &h->write_aiob.ctx)) {
         D("[ aio: got error on io_setup (%d) ]", errno);
diff --git a/libasyncio/AsyncIO.cpp b/libasyncio/AsyncIO.cpp
index 7430bc81e..6149f09d1 100644
--- a/libasyncio/AsyncIO.cpp
+++ b/libasyncio/AsyncIO.cpp
@@ -17,9 +17,10 @@
 #include <asyncio/AsyncIO.h>
 #include <sys/syscall.h>
 #include <unistd.h>
+#include <cstdint>
+#include <cstring>
 
 int io_setup(unsigned nr, aio_context_t* ctxp) {
-    memset(ctxp, 0, sizeof(*ctxp));
     return syscall(__NR_io_setup, nr, ctxp);
 }
 
@@ -48,3 +49,11 @@ void io_prep(iocb* iocb, int fd, const void* buf, uint64_t count, int64_t offset
     iocb->aio_nbytes = count;
     iocb->aio_offset = offset;
 }
+
+void io_prep_pread(struct iocb* iocb, int fd, void* buf, size_t count, long long offset) {
+    io_prep(iocb, fd, buf, count, offset, true);
+}
+
+void io_prep_pwrite(struct iocb* iocb, int fd, void* buf, size_t count, long long offset) {
+    io_prep(iocb, fd, buf, count, offset, false);
+}
diff --git a/libasyncio/include/asyncio/AsyncIO.h b/libasyncio/include/asyncio/AsyncIO.h
index e3fb93a4d..9620d2a84 100644
--- a/libasyncio/include/asyncio/AsyncIO.h
+++ b/libasyncio/include/asyncio/AsyncIO.h
@@ -17,9 +17,9 @@
 #ifndef _ASYNCIO_H
 #define _ASYNCIO_H
 
-#include <cstring>
-#include <cstdint>
 #include <linux/aio_abi.h>
+#include <stdbool.h>
+#include <stdint.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <time.h>
@@ -35,10 +35,14 @@ extern "C" {
 
 int io_setup(unsigned nr, aio_context_t* ctxp);
 int io_destroy(aio_context_t ctx);
-int io_submit(aio_context_t ctx, long nr, iocb** iocbpp);
-int io_getevents(aio_context_t ctx, long min_nr, long max_nr, io_event* events, timespec* timeout);
-int io_cancel(aio_context_t ctx, iocb*, io_event* result);
-void io_prep(iocb* iocb, int fd, const void* buf, uint64_t count, int64_t offset, bool read);
+int io_submit(aio_context_t ctx, long nr, struct iocb** iocbpp);
+int io_getevents(aio_context_t ctx, long min_nr, long max_nr, struct io_event* events,
+                 struct timespec* timeout);
+int io_cancel(aio_context_t ctx, struct iocb*, struct io_event* result);
+
+void io_prep_pread(struct iocb* iocb, int fd, void* buf, size_t count, long long offset);
+void io_prep_pwrite(struct iocb* iocb, int fd, void* buf, size_t count, long long offset);
+void io_prep(struct iocb* iocb, int fd, const void* buf, uint64_t count, int64_t offset, bool read);
 
 #ifdef __cplusplus
 };