io: introduce helper for creating channels from file descriptors

Depending on what object a file descriptor refers to a different
type of IO channel will be needed - either a QIOChannelFile or
a QIOChannelSocket. Introduce a qio_channel_new_fd() method
which will return the appropriate channel implementation.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/test-io-channel-file.c b/tests/test-io-channel-file.c
index f276a32de0..45e699044c 100644
--- a/tests/test-io-channel-file.c
+++ b/tests/test-io-channel-file.c
@@ -19,6 +19,7 @@
  */
 
 #include "io/channel-file.h"
+#include "io/channel-util.h"
 #include "io-channel-helpers.h"
 
 
@@ -49,6 +50,26 @@ static void test_io_channel_file(void)
 }
 
 
+static void test_io_channel_fd(void)
+{
+    QIOChannel *ioc;
+    int fd = -1;
+
+#define TEST_FILE "tests/test-io-channel-file.txt"
+    fd = open(TEST_FILE, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+    g_assert_cmpint(fd, >, -1);
+
+    ioc = qio_channel_new_fd(fd, &error_abort);
+
+    g_assert_cmpstr(object_get_typename(OBJECT(ioc)),
+                    ==,
+                    TYPE_QIO_CHANNEL_FILE);
+
+    unlink(TEST_FILE);
+    object_unref(OBJECT(ioc));
+}
+
+
 #ifndef _WIN32
 static void test_io_channel_pipe(bool async)
 {
@@ -92,6 +113,7 @@ int main(int argc, char **argv)
     g_test_init(&argc, &argv, NULL);
 
     g_test_add_func("/io/channel/file", test_io_channel_file);
+    g_test_add_func("/io/channel/file/fd", test_io_channel_fd);
 #ifndef _WIN32
     g_test_add_func("/io/channel/pipe/sync", test_io_channel_pipe_sync);
     g_test_add_func("/io/channel/pipe/async", test_io_channel_pipe_async);