Add qemu 2.4.0

[kvmfornfv.git] / qemu / migration / fd.c

diff --git a/qemu/migration/fd.c b/qemu/migration/fd.c
new file mode 100644 (file)
index 0000000..3e4bed0
--- /dev/null
+++ b/qemu/migration/fd.c
@@ -0,0 +1,88 @@
+/*
+ * QEMU live migration via generic fd
+ *
+ * Copyright Red Hat, Inc. 2009
+ *
+ * Authors:
+ *  Chris Lalancette <clalance@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "qemu-common.h"
+#include "qemu/main-loop.h"
+#include "qemu/sockets.h"
+#include "migration/migration.h"
+#include "monitor/monitor.h"
+#include "migration/qemu-file.h"
+#include "block/block.h"
+
+//#define DEBUG_MIGRATION_FD
+
+#ifdef DEBUG_MIGRATION_FD
+#define DPRINTF(fmt, ...) \
+    do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+    do { } while (0)
+#endif
+
+static bool fd_is_socket(int fd)
+{
+    struct stat stat;
+    int ret = fstat(fd, &stat);
+    if (ret == -1) {
+        /* When in doubt say no */
+        return false;
+    }
+    return S_ISSOCK(stat.st_mode);
+}
+
+void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
+{
+    int fd = monitor_get_fd(cur_mon, fdname, errp);
+    if (fd == -1) {
+        return;
+    }
+
+    if (fd_is_socket(fd)) {
+        s->file = qemu_fopen_socket(fd, "wb");
+    } else {
+        s->file = qemu_fdopen(fd, "wb");
+    }
+
+    migrate_fd_connect(s);
+}
+
+static void fd_accept_incoming_migration(void *opaque)
+{
+    QEMUFile *f = opaque;
+
+    qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
+    process_incoming_migration(f);
+}
+
+void fd_start_incoming_migration(const char *infd, Error **errp)
+{
+    int fd;
+    QEMUFile *f;
+
+    DPRINTF("Attempting to start an incoming migration via fd\n");
+
+    fd = strtol(infd, NULL, 0);
+    if (fd_is_socket(fd)) {
+        f = qemu_fopen_socket(fd, "rb");
+    } else {
+        f = qemu_fdopen(fd, "rb");
+    }
+    if(f == NULL) {
+        error_setg_errno(errp, errno, "failed to open the source descriptor");
+        return;
+    }
+
+    qemu_set_fd_handler(fd, fd_accept_incoming_migration, NULL, f);
+}