Add qemu_file_open and qemu_fd_open to create QEMUFile objects for unix
files and file descriptors.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 migration/qemu-file-channel.c | 36 ++++++++++++++++++++++++++++++++++++
 migration/qemu-file-channel.h |  6 ++++++
 2 files changed, 42 insertions(+)

diff --git a/migration/qemu-file-channel.c b/migration/qemu-file-channel.c
index bb5a575..afb16d7 100644
--- a/migration/qemu-file-channel.c
+++ b/migration/qemu-file-channel.c
@@ -27,8 +27,10 @@
 #include "qemu-file.h"
 #include "io/channel-socket.h"
 #include "io/channel-tls.h"
+#include "io/channel-file.h"
 #include "qemu/iov.h"
 #include "qemu/yank.h"
+#include "qapi/error.h"
 #include "yank_functions.h"
 
 
@@ -192,3 +194,37 @@ QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc)
     object_ref(OBJECT(ioc));
     return qemu_fopen_ops(ioc, &channel_output_ops, true);
 }
+
+QEMUFile *qemu_file_open(const char *path, int flags, int mode,
+                         const char *name, Error **errp)
+{
+    g_autoptr(QIOChannelFile) fioc = NULL;
+    QIOChannel *ioc;
+    QEMUFile *f;
+
+    if (flags & O_RDWR) {
+        error_setg(errp, "qemu_file_open %s: O_RDWR not supported", path);
+        return NULL;
+    }
+
+    fioc = qio_channel_file_new_path(path, flags, mode, errp);
+    if (!fioc) {
+        return NULL;
+    }
+
+    ioc = QIO_CHANNEL(fioc);
+    qio_channel_set_name(ioc, name);
+    f = (flags & O_WRONLY) ? qemu_fopen_channel_output(ioc) :
+                             qemu_fopen_channel_input(ioc);
+    return f;
+}
+
+QEMUFile *qemu_fd_open(int fd, bool writable, const char *name)
+{
+    g_autoptr(QIOChannelFile) fioc = qio_channel_file_new_fd(fd);
+    QIOChannel *ioc = QIO_CHANNEL(fioc);
+    QEMUFile *f = writable ? qemu_fopen_channel_output(ioc) :
+                             qemu_fopen_channel_input(ioc);
+    qio_channel_set_name(ioc, name);
+    return f;
+}
diff --git a/migration/qemu-file-channel.h b/migration/qemu-file-channel.h
index 0028a09..324ae2d 100644
--- a/migration/qemu-file-channel.h
+++ b/migration/qemu-file-channel.h
@@ -29,4 +29,10 @@
 
 QEMUFile *qemu_fopen_channel_input(QIOChannel *ioc);
 QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc);
+
+QEMUFile *qemu_file_open(const char *path, int flags, int mode,
+                         const char *name, Error **errp);
+
+QEMUFile *qemu_fd_open(int fd, bool writable, const char *name);
+
 #endif
-- 
1.8.3.1