X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=src%2Fguestfs.c;h=05fb113b864648a7530d37d46652cb879b6d2d64;hp=cab264a4fc37329f37f64604d1dc6cb5cb9d036b;hb=ae5be84decf1a40e1de22176c747e110b77829a2;hpb=e7eca50046e9a69dac27c0bee832af0a3014e02c

diff --git a/src/guestfs.c b/src/guestfs.c
index cab264a..05fb113 100644
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -29,7 +29,9 @@
 #include <string.h>
 #include <fcntl.h>
 #include <time.h>
+#include <sys/stat.h>
 #include <sys/select.h>
+
 #include <rpc/types.h>
 #include <rpc/xdr.h>
 
@@ -56,43 +58,79 @@
 #include "guestfs.h"
 #include "guestfs_protocol.h"
 
-static void error (guestfs_h *g, const char *fs, ...);
-static void perrorf (guestfs_h *g, const char *fs, ...);
-static void *safe_malloc (guestfs_h *g, size_t nbytes);
-static void *safe_realloc (guestfs_h *g, void *ptr, int nbytes);
-static char *safe_strdup (guestfs_h *g, const char *str);
-static void *safe_memdup (guestfs_h *g, void *ptr, size_t size);
+#define error guestfs_error
+#define perrorf guestfs_perrorf
+#define safe_malloc guestfs_safe_malloc
+#define safe_realloc guestfs_safe_realloc
+#define safe_strdup guestfs_safe_strdup
+#define safe_memdup guestfs_safe_memdup
 
 static void default_error_cb (guestfs_h *g, void *data, const char *msg);
-static void stdout_event (void *data, int watch, int fd, int events);
-static void sock_read_event (void *data, int watch, int fd, int events);
-static void sock_write_event (void *data, int watch, int fd, int events);
+static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
 
 static void close_handles (void);
 
-static int select_add_handle (guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
-static int select_remove_handle (guestfs_h *g, int watch);
-static int select_add_timeout (guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
-static int select_remove_timeout (guestfs_h *g, int timer);
-static void select_main_loop_run (guestfs_h *g);
-static void select_main_loop_quit (guestfs_h *g);
+static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
+static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
+static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
+static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
+static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
+static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
 
-#define UNIX_PATH_MAX 108
+/* Default select-based main loop. */
+struct select_handle_cb_data {
+  guestfs_handle_event_cb cb;
+  guestfs_h *g;
+  void *data;
+};
 
-/* Also in guestfsd.c */
-#define VMCHANNEL_PORT 6666
-#define VMCHANNEL_ADDR "10.0.2.4"
+struct select_main_loop {
+  /* NB. These fields must be the same as in struct guestfs_main_loop: */
+  guestfs_add_handle_cb add_handle;
+  guestfs_remove_handle_cb remove_handle;
+  guestfs_add_timeout_cb add_timeout;
+  guestfs_remove_timeout_cb remove_timeout;
+  guestfs_main_loop_run_cb main_loop_run;
+  guestfs_main_loop_quit_cb main_loop_quit;
+
+  /* Additional private data: */
+  int is_running;
+
+  fd_set rset;
+  fd_set wset;
+  fd_set xset;
+
+  int max_fd;
+  int nr_fds;
+  struct select_handle_cb_data *handle_cb_data;
+};
 
-/* Current main loop. */
-static guestfs_main_loop main_loop = {
+/* Default main loop. */
+static struct select_main_loop default_main_loop = {
   .add_handle = select_add_handle,
   .remove_handle = select_remove_handle,
   .add_timeout = select_add_timeout,
   .remove_timeout = select_remove_timeout,
   .main_loop_run = select_main_loop_run,
   .main_loop_quit = select_main_loop_quit,
+
+  /* XXX hopefully .rset, .wset, .xset are initialized to the empty
+   * set by the normal action of everything being initialized to zero.
+   */
+  .is_running = 0,
+  .max_fd = -1,
+  .nr_fds = 0,
+  .handle_cb_data = NULL,
 };
 
+#define UNIX_PATH_MAX 108
+
+/* Also in guestfsd.c */
+#define VMCHANNEL_PORT 6666
+#define VMCHANNEL_ADDR "10.0.2.4"
+
 /* GuestFS handle and connection. */
 enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
 
@@ -105,7 +143,8 @@ struct guestfs_h
 
   int fd[2];			/* Stdin/stdout of qemu. */
   int sock;			/* Daemon communications socket. */
-  int pid;			/* Qemu PID. */
+  pid_t pid;			/* Qemu PID. */
+  pid_t recoverypid;		/* Recovery process PID. */
   time_t start_t;		/* The time when we started qemu. */
 
   int stdout_watch;		/* Watches qemu stdout for log messages. */
@@ -120,11 +159,16 @@ struct guestfs_h
   int autosync;
 
   const char *path;
+  const char *qemu;
+
+  char *last_error;
 
   /* Callbacks. */
   guestfs_abort_cb           abort_cb;
   guestfs_error_handler_cb   error_cb;
   void *                     error_cb_data;
+  guestfs_send_cb            send_cb;
+  void *                     send_cb_data;
   guestfs_reply_cb           reply_cb;
   void *                     reply_cb_data;
   guestfs_log_message_cb     log_message_cb;
@@ -134,14 +178,8 @@ struct guestfs_h
   guestfs_launch_done_cb     launch_done_cb;
   void *                     launch_done_cb_data;
 
-  /* These callbacks are called before reply_cb and launch_done_cb,
-   * and are used to implement the high-level API without needing to
-   * interfere with callbacks that the user might have set.
-   */
-  guestfs_reply_cb           reply_cb_internal;
-  void *                     reply_cb_internal_data;
-  guestfs_launch_done_cb     launch_done_cb_internal;
-  void *                     launch_done_cb_internal_data;
+  /* Main loop used by this handle. */
+  guestfs_main_loop *main_loop;
 
   /* Messages sent and received from the daemon. */
   char *msg_in;
@@ -183,7 +221,11 @@ guestfs_create (void)
 
   str = getenv ("LIBGUESTFS_PATH");
   g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
-  /* XXX We should probably make QEMU configurable as well. */
+
+  str = getenv ("LIBGUESTFS_QEMU");
+  g->qemu = str != NULL ? str : QEMU;
+
+  g->main_loop = guestfs_get_default_main_loop ();
 
   /* Start with large serial numbers so they are easy to spot
    * inside the protocol.
@@ -264,6 +306,7 @@ guestfs_close (guestfs_h *g)
   }
   /* release mutex (XXX) */
 
+  free (g->last_error);
   free (g);
 }
 
@@ -274,38 +317,48 @@ close_handles (void)
   while (handles) guestfs_close (handles);
 }
 
+const char *
+guestfs_last_error (guestfs_h *g)
+{
+  return g->last_error;
+}
+
+static void
+set_last_error (guestfs_h *g, const char *msg)
+{
+  free (g->last_error);
+  g->last_error = strdup (msg);
+}
+
 static void
 default_error_cb (guestfs_h *g, void *data, const char *msg)
 {
   fprintf (stderr, "libguestfs: error: %s\n", msg);
 }
 
-static void
-error (guestfs_h *g, const char *fs, ...)
+void
+guestfs_error (guestfs_h *g, const char *fs, ...)
 {
   va_list args;
   char *msg;
 
-  if (!g->error_cb) return;
-
   va_start (args, fs);
   vasprintf (&msg, fs, args);
   va_end (args);
 
-  g->error_cb (g, g->error_cb_data, msg);
+  if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+  set_last_error (g, msg);
 
   free (msg);
 }
 
-static void
-perrorf (guestfs_h *g, const char *fs, ...)
+void
+guestfs_perrorf (guestfs_h *g, const char *fs, ...)
 {
   va_list args;
   char *msg;
   int err = errno;
 
-  if (!g->error_cb) return;
-
   va_start (args, fs);
   vasprintf (&msg, fs, args);
   va_end (args);
@@ -323,37 +376,38 @@ perrorf (guestfs_h *g, const char *fs, ...)
   strcat (msg, ": ");
   strcat (msg, buf);
 
-  g->error_cb (g, g->error_cb_data, msg);
+  if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+  set_last_error (g, msg);
 
   free (msg);
 }
 
-static void *
-safe_malloc (guestfs_h *g, size_t nbytes)
+void *
+guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
 {
   void *ptr = malloc (nbytes);
   if (!ptr) g->abort_cb ();
   return ptr;
 }
 
-static void *
-safe_realloc (guestfs_h *g, void *ptr, int nbytes)
+void *
+guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
 {
   void *p = realloc (ptr, nbytes);
   if (!p) g->abort_cb ();
   return p;
 }
 
-static char *
-safe_strdup (guestfs_h *g, const char *str)
+char *
+guestfs_safe_strdup (guestfs_h *g, const char *str)
 {
   char *s = strdup (str);
   if (!s) g->abort_cb ();
   return s;
 }
 
-static void *
-safe_memdup (guestfs_h *g, void *ptr, size_t size)
+void *
+guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
 {
   void *p = malloc (size);
   if (!p) g->abort_cb ();
@@ -361,6 +415,40 @@ safe_memdup (guestfs_h *g, void *ptr, size_t size)
   return p;
 }
 
+static int
+xwrite (int fd, const void *buf, size_t len)
+{
+  int r;
+
+  while (len > 0) {
+    r = write (fd, buf, len);
+    if (r == -1)
+      return -1;
+
+    buf += r;
+    len -= r;
+  }
+
+  return 0;
+}
+
+static int
+xread (int fd, void *buf, size_t len)
+{
+  int r;
+
+  while (len > 0) {
+    r = read (fd, buf, len);
+    if (r == -1)
+      return -1;
+
+    buf += r;
+    len -= r;
+  }
+
+  return 0;
+}
+
 void
 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
 {
@@ -429,6 +517,22 @@ guestfs_get_path (guestfs_h *g)
   return g->path;
 }
 
+int
+guestfs_set_qemu (guestfs_h *g, const char *qemu)
+{
+  if (qemu == NULL)
+    g->qemu = QEMU;
+  else
+    g->qemu = qemu;
+  return 0;
+}
+
+const char *
+guestfs_get_qemu (guestfs_h *g)
+{
+  return g->qemu;
+}
+
 /* Add a string to the current command line. */
 static void
 incr_cmdline_size (guestfs_h *g)
@@ -531,7 +635,7 @@ int
 guestfs_launch (guestfs_h *g)
 {
   static const char *dir_template = "/tmp/libguestfsXXXXXX";
-  int r, i, len, pmore;
+  int r, i, len, pmore, memsize;
   int wfd[2], rfd[2];
   int tries;
   const char *kernel_name = "vmlinuz." REPO "." host_cpu;
@@ -540,6 +644,7 @@ guestfs_launch (guestfs_h *g)
   char *kernel = NULL, *initrd = NULL;
   char unixsock[256];
   struct sockaddr_un addr;
+  struct stat statbuf;
 
   /* Configured? */
   if (!g->cmdline) {
@@ -599,6 +704,40 @@ guestfs_launch (guestfs_h *g)
     goto cleanup0;
   }
 
+  /* Choose a suitable memory size (in MB).  This is more art
+   * than science, but you can help by doing
+   *   ./configure --enable-debug-command
+   * and then running:
+   *   debug sh free
+   *   debug mem ''
+   * and seeing how much free memory is left for particular
+   * configurations.
+   *
+   * It's also helpful to report both the compressed and uncompressed
+   * size of the initramfs (ls -lh initramfs*.img; du -sh initramfs).
+   *
+   * XXX KVM virtio balloon driver?
+   */
+  if (stat (initrd, &statbuf) != -1) {
+    /* Approximate size of the initramfs after it is decompressed
+     * in kernel memory.  The compression factor is ~2.5-3.
+     */
+    memsize = 3 * statbuf.st_size / 1024 / 1024;
+
+    /* Approximate size used by the kernel. */
+    memsize += 10;
+
+    /* Want to give userspace some room, so: */
+    memsize += 128;
+
+#if SIZEOF_LONG == 8
+    /* On 64 bit, assume some overhead. */
+    memsize += 64;
+#endif
+  } else
+    memsize = 512;
+  
+
   /* Make the temporary directory containing the socket. */
   if (!g->tmpdir) {
     g->tmpdir = safe_strdup (g, dir_template);
@@ -629,11 +768,12 @@ guestfs_launch (guestfs_h *g)
   if (r == 0) {			/* Child (qemu). */
     char vmchannel[256];
     char append[256];
+    char memsize_str[256];
 
     /* Set up the full command line.  Do this in the subprocess so we
      * don't need to worry about cleaning up.
      */
-    g->cmdline[0] = (char *) QEMU;
+    g->cmdline[0] = (char *) g->qemu;
 
     /* Construct the -net channel parameter for qemu. */
     snprintf (vmchannel, sizeof vmchannel,
@@ -642,11 +782,17 @@ guestfs_launch (guestfs_h *g)
 
     /* Linux kernel command line. */
     snprintf (append, sizeof append,
-	      "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
+	      "console=ttyS0 guestfs=%s:%d%s",
+	      VMCHANNEL_ADDR, VMCHANNEL_PORT,
+	      g->verbose ? " guestfs_verbose=1" : "");
+
+    snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
 
     add_cmdline (g, "-m");
-    add_cmdline (g, "384");	  /* XXX Choose best size. */
+    add_cmdline (g, memsize_str);
+#if 0
     add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
+#endif
     add_cmdline (g, "-kernel");
     add_cmdline (g, (char *) kernel);
     add_cmdline (g, "-initrd");
@@ -661,12 +807,12 @@ guestfs_launch (guestfs_h *g)
     add_cmdline (g, "-net");
     add_cmdline (g, "user,vlan=0");
     add_cmdline (g, "-net");
-    add_cmdline (g, "nic,vlan=0");
+    add_cmdline (g, "nic,model=rtl8139,vlan=0");
     incr_cmdline_size (g);
     g->cmdline[g->cmdline_size-1] = NULL;
 
     if (g->verbose) {
-      fprintf (stderr, "%s", QEMU);
+      fprintf (stderr, "%s", g->qemu);
       for (i = 0; g->cmdline[i]; ++i)
 	fprintf (stderr, " %s", g->cmdline[i]);
       fprintf (stderr, "\n");
@@ -689,14 +835,48 @@ guestfs_launch (guestfs_h *g)
     setpgid (0, 0);
 #endif
 
-    execv (QEMU, g->cmdline);	/* Run qemu. */
-    perror (QEMU);
+    execv (g->qemu, g->cmdline); /* Run qemu. */
+    perror (g->qemu);
     _exit (1);
   }
 
   /* Parent (library). */
   g->pid = r;
 
+  /* Fork the recovery process off which will kill qemu if the parent
+   * process fails to do so (eg. if the parent segfaults).
+   */
+  r = fork ();
+  if (r == 0) {
+    pid_t qemu_pid = g->pid;
+    pid_t parent_pid = getppid ();
+
+    /* Writing to argv is hideously complicated and error prone.  See:
+     * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+     */
+
+    /* Loop around waiting for one or both of the other processes to
+     * disappear.  It's fair to say this is very hairy.  The PIDs that
+     * we are looking at might be reused by another process.  We are
+     * effectively polling.  Is the cure worse than the disease?
+     */
+    for (;;) {
+      if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
+	_exit (0);
+      if (kill (parent_pid, 0) == -1) {
+	/* Parent's gone away, qemu still around, so kill qemu. */
+	kill (qemu_pid, 9);
+	_exit (0);
+      }
+      sleep (2);
+    }
+  }
+
+  /* Don't worry, if the fork failed, this will be -1.  The recovery
+   * process isn't essential.
+   */
+  g->recoverypid = r;
+
   /* Start the clock ... */
   time (&g->start_t);
 
@@ -766,31 +946,25 @@ guestfs_launch (guestfs_h *g)
   g->msg_out_pos = 0;
 
   g->stdout_watch =
-    main_loop.add_handle (g, g->fd[1],
-			  GUESTFS_HANDLE_READABLE,
-			  stdout_event, g);
+    g->main_loop->add_handle (g->main_loop, g, g->fd[1],
+			      GUESTFS_HANDLE_READABLE,
+			      stdout_event, NULL);
   if (g->stdout_watch == -1) {
     error (g, "could not watch qemu stdout");
     goto cleanup3;
   }
 
-  g->sock_watch =
-    main_loop.add_handle (g, g->sock,
-			  GUESTFS_HANDLE_READABLE,
-			  sock_read_event, g);
-  if (g->sock_watch == -1) {
-    error (g, "could not watch daemon communications socket");
+  if (guestfs__switch_to_receiving (g) == -1)
     goto cleanup3;
-  }
 
   g->state = LAUNCHING;
   return 0;
 
  cleanup3:
   if (g->stdout_watch >= 0)
-    main_loop.remove_handle (g, g->stdout_watch);
+    g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
   if (g->sock_watch >= 0)
-    main_loop.remove_handle (g, g->sock_watch);
+    g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
 
  cleanup2:
   close (g->sock);
@@ -799,11 +973,14 @@ guestfs_launch (guestfs_h *g)
   close (wfd[1]);
   close (rfd[0]);
   kill (g->pid, 9);
+  if (g->recoverypid > 0) kill (g->recoverypid, 9);
   waitpid (g->pid, NULL, 0);
+  if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
   g->fd[0] = -1;
   g->fd[1] = -1;
   g->sock = -1;
   g->pid = 0;
+  g->recoverypid = 0;
   g->start_t = 0;
   g->stdout_watch = -1;
   g->sock_watch = -1;
@@ -817,14 +994,17 @@ guestfs_launch (guestfs_h *g)
 static void
 finish_wait_ready (guestfs_h *g, void *vp)
 {
+  if (g->verbose)
+    fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
+
   *((int *)vp) = 1;
-  main_loop.main_loop_quit (g);
+  g->main_loop->main_loop_quit (g->main_loop, g);
 }
 
 int
 guestfs_wait_ready (guestfs_h *g)
 {
-  int r = 0;
+  int finished = 0, r;
 
   if (g->state == READY) return 0;
 
@@ -838,13 +1018,15 @@ guestfs_wait_ready (guestfs_h *g)
     return -1;
   }
 
-  g->launch_done_cb_internal = finish_wait_ready;
-  g->launch_done_cb_internal_data = &r;
-  main_loop.main_loop_run (g);
-  g->launch_done_cb_internal = NULL;
-  g->launch_done_cb_internal_data = NULL;
+  g->launch_done_cb = finish_wait_ready;
+  g->launch_done_cb_data = &finished;
+  r = g->main_loop->main_loop_run (g->main_loop, g);
+  g->launch_done_cb = NULL;
+  g->launch_done_cb_data = NULL;
+
+  if (r == -1) return -1;
 
-  if (r != 1) {
+  if (finished != 1) {
     error (g, "guestfs_wait_ready failed, see earlier error messages");
     return -1;
   }
@@ -874,18 +1056,103 @@ guestfs_kill_subprocess (guestfs_h *g)
     fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
 
   kill (g->pid, SIGTERM);
+  if (g->recoverypid > 0) kill (g->recoverypid, 9);
 
   return 0;
 }
 
+/* Access current state. */
+int
+guestfs_is_config (guestfs_h *g)
+{
+  return g->state == CONFIG;
+}
+
+int
+guestfs_is_launching (guestfs_h *g)
+{
+  return g->state == LAUNCHING;
+}
+
+int
+guestfs_is_ready (guestfs_h *g)
+{
+  return g->state == READY;
+}
+
+int
+guestfs_is_busy (guestfs_h *g)
+{
+  return g->state == BUSY;
+}
+
+int
+guestfs_get_state (guestfs_h *g)
+{
+  return g->state;
+}
+
+int
+guestfs_set_ready (guestfs_h *g)
+{
+  if (g->state != BUSY) {
+    error (g, "guestfs_set_ready: called when in state %d != BUSY", g->state);
+    return -1;
+  }
+  g->state = READY;
+  return 0;
+}
+
+int
+guestfs_set_busy (guestfs_h *g)
+{
+  if (g->state != READY) {
+    error (g, "guestfs_set_busy: called when in state %d != READY", g->state);
+    return -1;
+  }
+  g->state = BUSY;
+  return 0;
+}
+
+/* Structure-freeing functions.  These rely on the fact that the
+ * structure format is identical to the XDR format.  See note in
+ * generator.ml.
+ */
+void
+guestfs_free_int_bool (struct guestfs_int_bool *x)
+{
+  free (x);
+}
+
+void
+guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
+{
+  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
+  free (x);
+}
+
+void
+guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
+{
+  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
+  free (x);
+}
+
+void
+guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
+{
+  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
+  free (x);
+}
+
 /* This function is called whenever qemu prints something on stdout.
  * Qemu's stdout is also connected to the guest's serial console, so
  * we see kernel messages here too.
  */
 static void
-stdout_event (void *data, int watch, int fd, int events)
+stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+	      int watch, int fd, int events)
 {
-  guestfs_h *g = (guestfs_h *) data;
   char buf[4096];
   int n;
 
@@ -907,11 +1174,13 @@ stdout_event (void *data, int watch, int fd, int events)
     if (g->verbose)
       fprintf (stderr, "stdout_event: %p: child process died\n", g);
     /*kill (g->pid, SIGTERM);*/
+    if (g->recoverypid > 0) kill (g->recoverypid, 9);
     waitpid (g->pid, NULL, 0);
+    if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
     if (g->stdout_watch >= 0)
-      main_loop.remove_handle (g, g->stdout_watch);
+      g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
     if (g->sock_watch >= 0)
-      main_loop.remove_handle (g, g->sock_watch);
+      g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
     close (g->fd[0]);
     close (g->fd[1]);
     close (g->sock);
@@ -919,6 +1188,7 @@ stdout_event (void *data, int watch, int fd, int events)
     g->fd[1] = -1;
     g->sock = -1;
     g->pid = 0;
+    g->recoverypid = 0;
     g->start_t = 0;
     g->stdout_watch = -1;
     g->sock_watch = -1;
@@ -947,9 +1217,9 @@ stdout_event (void *data, int watch, int fd, int events)
  * guestfsd (daemon inside the guest) communication socket.
  */
 static void
-sock_read_event (void *data, int watch, int fd, int events)
+sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+		 int watch, int fd, int events)
 {
-  guestfs_h *g = (guestfs_h *) data;
   XDR xdr;
   unsigned len;
   int n;
@@ -985,6 +1255,7 @@ sock_read_event (void *data, int watch, int fd, int events)
   g->msg_in_size += n;
 
   /* Have we got enough of a message to be able to process it yet? */
+ again:
   if (g->msg_in_size < 4) return;
 
   xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
@@ -997,7 +1268,7 @@ sock_read_event (void *data, int watch, int fd, int events)
    * starts up it sends a "magic" value (longer than any possible
    * message).  Check for this.
    */
-  if (len == 0xf5f55ff5) {
+  if (len == GUESTFS_LAUNCH_FLAG) {
     if (g->state != LAUNCHING)
       error (g, "received magic signature from guestfsd, but in state %d",
 	     g->state);
@@ -1006,8 +1277,6 @@ sock_read_event (void *data, int watch, int fd, int events)
 	     g->msg_in_size);
     else {
       g->state = READY;
-      if (g->launch_done_cb_internal)
-	g->launch_done_cb_internal (g, g->launch_done_cb_internal_data);
       if (g->launch_done_cb)
 	g->launch_done_cb (g, g->launch_done_cb_data);
     }
@@ -1015,7 +1284,19 @@ sock_read_event (void *data, int watch, int fd, int events)
     goto cleanup;
   }
 
-  /* If this happens, it's pretty bad and we've probably lost synchronization.*/
+  /* This can happen if a cancellation happens right at the end
+   * of us sending a FileIn parameter to the daemon.  Discard.  The
+   * daemon should send us an error message next.
+   */
+  if (len == GUESTFS_CANCEL_FLAG) {
+    g->msg_in_size -= 4;
+    memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
+    goto again;
+  }
+
+  /* If this happens, it's pretty bad and we've probably lost
+   * synchronization.
+   */
   if (len > GUESTFS_MESSAGE_MAX) {
     error (g, "message length (%u) > maximum possible size (%d)",
 	   len, GUESTFS_MESSAGE_MAX);
@@ -1024,14 +1305,6 @@ sock_read_event (void *data, int watch, int fd, int events)
 
   if (g->msg_in_size-4 < len) return; /* Need more of this message. */
 
-  /* This should not happen, and if it does it probably means we've
-   * lost all hope of synchronization.
-   */
-  if (g->msg_in_size-4 > len) {
-    error (g, "len = %d, but msg_in_size-4 = %d", len, g->msg_in_size-4);
-    goto cleanup;
-  }
-
   /* Got the full message, begin processing it. */
   if (g->verbose) {
     int i, j;
@@ -1058,15 +1331,13 @@ sock_read_event (void *data, int watch, int fd, int events)
   if (g->state != BUSY)
     error (g, "state %d != BUSY", g->state);
 
-  /* Push the message up to the higher layer.  Note that unlike
-   * launch_done_cb / launch_done_cb_internal, we only call at
-   * most one of the callback functions here.
-   */
-  g->state = READY;
-  if (g->reply_cb_internal)
-    g->reply_cb_internal (g, g->reply_cb_internal_data, &xdr);
-  else if (g->reply_cb)
-    g->reply_cb (g, g->reply_cb, &xdr);
+  /* Push the message up to the higher layer. */
+  if (g->reply_cb)
+    g->reply_cb (g, g->reply_cb_data, &xdr);
+
+  g->msg_in_size -= len + 4;
+  memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
+  if (g->msg_in_size > 0) goto again;
 
  cleanup:
   /* Free the message buffer if it's grown excessively large. */
@@ -1084,9 +1355,9 @@ sock_read_event (void *data, int watch, int fd, int events)
  * guestfsd (daemon inside the guest) communication socket.
  */
 static void
-sock_write_event (void *data, int watch, int fd, int events)
+sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+		  int watch, int fd, int events)
 {
-  guestfs_h *g = (guestfs_h *) data;
   int n;
 
   if (g->verbose)
@@ -1126,43 +1397,172 @@ sock_write_event (void *data, int watch, int fd, int events)
     return;
 
   if (g->verbose)
-    fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
+    fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
 
   free (g->msg_out);
+  g->msg_out = NULL;
   g->msg_out_pos = g->msg_out_size = 0;
 
-  if (main_loop.remove_handle (g, g->sock_watch) == -1) {
-    error (g, "remove_handle failed in sock_write_event");
-    return;
+  /* Done writing, call the higher layer. */
+  if (g->send_cb)
+    g->send_cb (g, g->send_cb_data);
+}
+
+void
+guestfs_set_send_callback (guestfs_h *g,
+			   guestfs_send_cb cb, void *opaque)
+{
+  g->send_cb = cb;
+  g->send_cb_data = opaque;
+}
+
+void
+guestfs_set_reply_callback (guestfs_h *g,
+			    guestfs_reply_cb cb, void *opaque)
+{
+  g->reply_cb = cb;
+  g->reply_cb_data = opaque;
+}
+
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+				  guestfs_log_message_cb cb, void *opaque)
+{
+  g->log_message_cb = cb;
+  g->log_message_cb_data = opaque;
+}
+
+void
+guestfs_set_subprocess_quit_callback (guestfs_h *g,
+				      guestfs_subprocess_quit_cb cb, void *opaque)
+{
+  g->subprocess_quit_cb = cb;
+  g->subprocess_quit_cb_data = opaque;
+}
+
+void
+guestfs_set_launch_done_callback (guestfs_h *g,
+				  guestfs_launch_done_cb cb, void *opaque)
+{
+  g->launch_done_cb = cb;
+  g->launch_done_cb_data = opaque;
+}
+
+/* Access to the handle's main loop and the default main loop. */
+void
+guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
+{
+  g->main_loop = main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_main_loop (guestfs_h *g)
+{
+  return g->main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_default_main_loop (void)
+{
+  return (guestfs_main_loop *) &default_main_loop;
+}
+
+/* Change the daemon socket handler so that we are now writing.
+ * This sets the handle to sock_write_event.
+ */
+int
+guestfs__switch_to_sending (guestfs_h *g)
+{
+  if (g->sock_watch >= 0) {
+    if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+      error (g, "remove_handle failed");
+      g->sock_watch = -1;
+      return -1;
+    }
+  }
+
+  g->sock_watch =
+    g->main_loop->add_handle (g->main_loop, g, g->sock,
+			      GUESTFS_HANDLE_WRITABLE,
+			      sock_write_event, NULL);
+  if (g->sock_watch == -1) {
+    error (g, "add_handle failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+guestfs__switch_to_receiving (guestfs_h *g)
+{
+  if (g->sock_watch >= 0) {
+    if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+      error (g, "remove_handle failed");
+      g->sock_watch = -1;
+      return -1;
+    }
   }
+
   g->sock_watch =
-    main_loop.add_handle (g, g->sock,
-			  GUESTFS_HANDLE_READABLE,
-			  sock_read_event, g);
+    g->main_loop->add_handle (g->main_loop, g, g->sock,
+			      GUESTFS_HANDLE_READABLE,
+			      sock_read_event, NULL);
   if (g->sock_watch == -1) {
-    error (g, "add_handle failed in sock_write_event");
-    return;
+    error (g, "add_handle failed");
+    return -1;
   }
+
+  return 0;
 }
 
-/* Dispatch a call to the remote daemon.  This function just queues
- * the call in msg_out, to be sent when we next enter the main loop.
- * Returns -1 for error, or the message serial number.
+/* Dispatch a call (len + header + args) to the remote daemon,
+ * synchronously (ie. using the guest's main loop to wait until
+ * it has been sent).  Returns -1 for error, or the serial
+ * number of the message.
  */
-static int
-dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
+static void
+send_cb (guestfs_h *g, void *data)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+  *((int *)data) = 1;
+  ml->main_loop_quit (ml, g);
+}
+
+int
+guestfs__send_sync (guestfs_h *g, int proc_nr,
+		    xdrproc_t xdrp, char *args)
 {
-  char buffer[GUESTFS_MESSAGE_MAX];
   struct guestfs_message_header hdr;
   XDR xdr;
   unsigned len;
   int serial = g->msg_next_serial++;
+  int sent;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
 
-  if (g->state != READY) {
-    error (g, "dispatch: state %d != READY", g->state);
+  if (g->state != BUSY) {
+    error (g, "guestfs__send_sync: state %d != BUSY", g->state);
     return -1;
   }
 
+  /* This is probably an internal error.  Or perhaps we should just
+   * free the buffer anyway?
+   */
+  if (g->msg_out != NULL) {
+    error (g, "guestfs__send_sync: msg_out should be NULL");
+    return -1;
+  }
+
+  /* We have to allocate this message buffer on the heap because
+   * it is quite large (although will be mostly unused).  We
+   * can't allocate it on the stack because in some environments
+   * we have quite limited stack space available, notably when
+   * running in the JVM.
+   */
+  g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
+  xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+
   /* Serialize the header. */
   hdr.prog = GUESTFS_PROGRAM;
   hdr.vers = GUESTFS_PROTOCOL_VERSION;
@@ -1171,10 +1571,9 @@ dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
   hdr.serial = serial;
   hdr.status = GUESTFS_STATUS_OK;
 
-  xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
   if (!xdr_guestfs_message_header (&xdr, &hdr)) {
     error (g, "xdr_guestfs_message_header failed");
-    return -1;
+    goto cleanup1;
   }
 
   /* Serialize the args.  If any, because some message types
@@ -1183,39 +1582,32 @@ dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
   if (xdrp) {
     if (!(*xdrp) (&xdr, args)) {
       error (g, "dispatch failed to marshal args");
-      return -1;
+      goto cleanup1;
     }
   }
 
+  /* Get the actual length of the message, resize the buffer to match
+   * the actual length, and write the length word at the beginning.
+   */
   len = xdr_getpos (&xdr);
   xdr_destroy (&xdr);
 
-  /* Allocate the outgoing message buffer. */
-  g->msg_out = safe_malloc (g, len + 4);
-
+  g->msg_out = safe_realloc (g, g->msg_out, len + 4);
   g->msg_out_size = len + 4;
   g->msg_out_pos = 0;
-  g->state = BUSY;
 
   xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
-  if (!xdr_uint32_t (&xdr, &len)) {
-    error (g, "xdr_uint32_t failed in dispatch");
-    goto cleanup1;
-  }
+  xdr_uint32_t (&xdr, &len);
 
-  memcpy (g->msg_out + 4, buffer, len);
+  if (guestfs__switch_to_sending (g) == -1)
+    goto cleanup1;
 
-  /* Change the handle to sock_write_event. */
-  if (main_loop.remove_handle (g, g->sock_watch) == -1) {
-    error (g, "remove_handle failed in dispatch");
+  sent = 0;
+  guestfs_set_send_callback (g, send_cb, &sent);
+  if (ml->main_loop_run (ml, g) == -1)
     goto cleanup1;
-  }
-  g->sock_watch =
-    main_loop.add_handle (g, g->sock,
-			  GUESTFS_HANDLE_WRITABLE,
-			  sock_write_event, g);
-  if (g->sock_watch == -1) {
-    error (g, "add_handle failed in dispatch");
+  if (sent != 1) {
+    error (g, "send failed, see earlier error messages");
     goto cleanup1;
   }
 
@@ -1225,110 +1617,355 @@ dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
   free (g->msg_out);
   g->msg_out = NULL;
   g->msg_out_size = 0;
-  g->state = READY;
   return -1;
 }
 
-/* Check the return message from a call for validity. */
-static int
-check_reply_header (guestfs_h *g,
-		    const struct guestfs_message_header *hdr,
-		    int proc_nr, int serial)
+static int cancel = 0; /* XXX Implement file cancellation. */
+static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
+static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
+static int send_file_cancellation_sync (guestfs_h *g);
+static int send_file_complete_sync (guestfs_h *g);
+
+/* Synchronously send a file.
+ * Returns:
+ *   0 OK
+ *   -1 error
+ *   -2 daemon cancelled (we must read the error message)
+ */
+int
+guestfs__send_file_sync (guestfs_h *g, const char *filename)
 {
-  if (hdr->prog != GUESTFS_PROGRAM) {
-    error (g, "wrong program (%d/%d)", hdr->prog, GUESTFS_PROGRAM);
+  char buf[GUESTFS_MAX_CHUNK_SIZE];
+  int fd, r, err;
+
+  fd = open (filename, O_RDONLY);
+  if (fd == -1) {
+    perrorf (g, "open: %s", filename);
+    send_file_cancellation_sync (g);
+    /* Daemon sees cancellation and won't reply, so caller can
+     * just return here.
+     */
     return -1;
   }
-  if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
-    error (g, "wrong protocol version (%d/%d)",
-	   hdr->vers, GUESTFS_PROTOCOL_VERSION);
-    return -1;
+
+  /* Send file in chunked encoding. */
+  while (!cancel && (r = read (fd, buf, sizeof buf)) > 0) {
+    err = send_file_data_sync (g, buf, r);
+    if (err < 0) {
+      if (err == -2)		/* daemon sent cancellation */
+	send_file_cancellation_sync (g);
+      return err;
+    }
   }
-  if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
-    error (g, "unexpected message direction (%d/%d)",
-	   hdr->direction, GUESTFS_DIRECTION_REPLY);
+
+  if (cancel) {			/* cancel from either end */
+    send_file_cancellation_sync (g);
     return -1;
   }
-  if (hdr->proc != proc_nr) {
-    error (g, "unexpected procedure number (%d/%d)", hdr->proc, proc_nr);
+
+  if (r == -1) {
+    perrorf (g, "read: %s", filename);
+    send_file_cancellation_sync (g);
     return -1;
   }
-  if (hdr->serial != serial) {
-    error (g, "unexpected serial (%d/%d)", hdr->serial, serial);
+
+  /* End of file, but before we send that, we need to close
+   * the file and check for errors.
+   */
+  if (close (fd) == -1) {
+    perrorf (g, "close: %s", filename);
+    send_file_cancellation_sync (g);
     return -1;
   }
 
-  return 0;
+  return send_file_complete_sync (g);
 }
 
-/* The high-level actions are autogenerated by generator.ml.  Include
- * them here.
- */
-#include "guestfs-actions.c"
+/* Send a chunk of file data. */
+static int
+send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
+{
+  return send_file_chunk_sync (g, 0, buf, len);
+}
 
-/* Structure-freeing functions.  These rely on the fact that the
- * structure format is identical to the XDR format.  See note in
- * generator.ml.
- */
-void
-guestfs_free_int_bool (struct guestfs_int_bool *x)
+/* Send a cancellation message. */
+static int
+send_file_cancellation_sync (guestfs_h *g)
 {
-  free (x);
+  return send_file_chunk_sync (g, 1, NULL, 0);
 }
 
-void
-guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
+/* Send a file complete chunk. */
+static int
+send_file_complete_sync (guestfs_h *g)
 {
-  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
-  free (x);
+  char buf[1];
+  return send_file_chunk_sync (g, 0, buf, 0);
 }
 
-void
-guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
+/* Send a chunk, cancellation or end of file, synchronously (ie. wait
+ * for it to go).
+ */
+static int check_for_daemon_cancellation (guestfs_h *g);
+
+static int
+send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
 {
-  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
-  free (x);
+  unsigned len;
+  int sent;
+  guestfs_chunk chunk;
+  XDR xdr;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+  if (g->state != BUSY) {
+    error (g, "send_file_chunk_sync: state %d != READY", g->state);
+    return -1;
+  }
+
+  /* This is probably an internal error.  Or perhaps we should just
+   * free the buffer anyway?
+   */
+  if (g->msg_out != NULL) {
+    error (g, "guestfs__send_sync: msg_out should be NULL");
+    return -1;
+  }
+
+  /* Did the daemon send a cancellation message? */
+  if (check_for_daemon_cancellation (g)) {
+    if (g->verbose)
+      fprintf (stderr, "got daemon cancellation\n");
+    return -2;
+  }
+
+  /* Allocate the chunk buffer.  Don't use the stack to avoid
+   * excessive stack usage and unnecessary copies.
+   */
+  g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
+  xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+
+  /* Serialize the chunk. */
+  chunk.cancel = cancel;
+  chunk.data.data_len = buflen;
+  chunk.data.data_val = (char *) buf;
+
+  if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+    error (g, "xdr_guestfs_chunk failed (buf = %p, buflen = %zu)",
+	   buf, buflen);
+    xdr_destroy (&xdr);
+    goto cleanup1;
+  }
+
+  len = xdr_getpos (&xdr);
+  xdr_destroy (&xdr);
+
+  /* Reduce the size of the outgoing message buffer to the real length. */
+  g->msg_out = safe_realloc (g, g->msg_out, len + 4);
+  g->msg_out_size = len + 4;
+  g->msg_out_pos = 0;
+
+  xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+  xdr_uint32_t (&xdr, &len);
+
+  if (guestfs__switch_to_sending (g) == -1)
+    goto cleanup1;
+
+  sent = 0;
+  guestfs_set_send_callback (g, send_cb, &sent);
+  if (ml->main_loop_run (ml, g) == -1)
+    goto cleanup1;
+  if (sent != 1) {
+    error (g, "send file chunk failed, see earlier error messages");
+    goto cleanup1;
+  }
+
+  return 0;
+
+ cleanup1:
+  free (g->msg_out);
+  g->msg_out = NULL;
+  g->msg_out_size = 0;
+  return -1;
 }
 
-void
-guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
+/* At this point we are sending FileIn file(s) to the guest, and not
+ * expecting to read anything, so if we do read anything, it must be
+ * a cancellation message.  This checks for this case without blocking.
+ */
+static int
+check_for_daemon_cancellation (guestfs_h *g)
 {
-  xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
-  free (x);
+  fd_set rset;
+  struct timeval tv;
+  int r;
+  char buf[4];
+  uint32_t flag;
+  XDR xdr;
+
+  FD_ZERO (&rset);
+  FD_SET (g->sock, &rset);
+  tv.tv_sec = 0;
+  tv.tv_usec = 0;
+  r = select (g->sock+1, &rset, NULL, NULL, &tv);
+  if (r == -1) {
+    perrorf (g, "select");
+    return 0;
+  }
+  if (r == 0)
+    return 0;
+
+  /* Read the message from the daemon. */
+  r = xread (g->sock, buf, sizeof buf);
+  if (r == -1) {
+    perrorf (g, "read");
+    return 0;
+  }
+
+  xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
+  xdr_uint32_t (&xdr, &flag);
+  xdr_destroy (&xdr);
+
+  if (flag != GUESTFS_CANCEL_FLAG) {
+    error (g, "check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n",
+	   flag, GUESTFS_CANCEL_FLAG);
+    return 0;
+  }
+
+  return 1;
 }
 
-/* This is the default main loop implementation, using select(2). */
+/* Synchronously receive a file. */
 
-struct handle_cb_data {
-  guestfs_handle_event_cb cb;
-  void *data;
-};
+static int receive_file_data_sync (guestfs_h *g, void **buf);
 
-static fd_set rset;
-static fd_set wset;
-static fd_set xset;
-static int select_init_done = 0;
-static int max_fd = -1;
-static int nr_fds = 0;
-static struct handle_cb_data *handle_cb_data = NULL;
+int
+guestfs__receive_file_sync (guestfs_h *g, const char *filename)
+{
+  void *buf;
+  int fd, r;
+
+  fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
+  if (fd == -1) {
+    perrorf (g, "open: %s", filename);
+    goto cancel;
+  }
+
+  /* Receive the file in chunked encoding. */
+  while ((r = receive_file_data_sync (g, &buf)) > 0) {
+    if (xwrite (fd, buf, r) == -1) {
+      perrorf (g, "%s: write", filename);
+      free (buf);
+      goto cancel;
+    }
+    free (buf);
+  }
+
+  if (r == -1) {
+    error (g, "%s: error in chunked encoding", filename);
+    return -1;
+  }
+
+  if (close (fd) == -1) {
+    perrorf (g, "close: %s", filename);
+    return -1;
+  }
+
+  return 0;
+
+ cancel: ;
+  /* Send cancellation message to daemon, then wait until it
+   * cancels (just throwing away data).
+   */
+  XDR xdr;
+  char fbuf[4];
+  uint32_t flag = GUESTFS_CANCEL_FLAG;
+
+  xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
+  xdr_uint32_t (&xdr, &flag);
+  xdr_destroy (&xdr);
+
+  if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
+    perrorf (g, "write to daemon socket");
+    return -1;
+  }
+
+  while ((r = receive_file_data_sync (g, &buf)) > 0)
+    free (buf);			/* just discard it */
+
+  return -1;
+}
+
+struct receive_file_ctx {
+  int code;
+  void **buf;
+};
 
 static void
-select_init (void)
+receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
 {
-  if (!select_init_done) {
-    FD_ZERO (&rset);
-    FD_ZERO (&wset);
-    FD_ZERO (&xset);
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
+  guestfs_chunk chunk;
+
+  ml->main_loop_quit (ml, g);
 
-    select_init_done = 1;
+  memset (&chunk, 0, sizeof chunk);
+
+  if (!xdr_guestfs_chunk (xdr, &chunk)) {
+    error (g, "failed to parse file chunk");
+    ctx->code = -1;
+    return;
+  }
+  if (chunk.cancel) {
+    error (g, "file receive cancelled by daemon");
+    ctx->code = -2;
+    return;
   }
+  if (chunk.data.data_len == 0) { /* end of transfer */
+    ctx->code = 0;
+    return;
+  }
+
+  ctx->code = chunk.data.data_len;
+  *ctx->buf = chunk.data.data_val; /* caller frees */
 }
 
+/* Receive a chunk of file data. */
 static int
-select_add_handle (guestfs_h *g, int fd, int events,
+receive_file_data_sync (guestfs_h *g, void **buf)
+{
+  struct receive_file_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+  ctx.code = -3;
+  ctx.buf = buf;
+
+  guestfs_set_reply_callback (g, receive_file_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+
+  if (g->verbose)
+    fprintf (stderr, "receive_file_data_sync: code %d\n", ctx.code);
+
+  switch (ctx.code) {
+  case 0:			/* end of file */
+    return 0;
+  case -1: case -2:
+    return -1;
+  case -3:
+    error (g, "failed to call receive_file_cb");
+    return -1;
+  default:			/* received n bytes of data */
+    return ctx.code;
+  }
+}
+
+/* This is the default main loop implementation, using select(2). */
+
+static int
+select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
 		   guestfs_handle_event_cb cb, void *data)
 {
-  select_init ();
+  struct select_main_loop *ml = (struct select_main_loop *) mlv;
 
   if (fd < 0 || fd >= FD_SETSIZE) {
     error (g, "fd %d is out of range", fd);
@@ -1348,7 +1985,9 @@ select_add_handle (guestfs_h *g, int fd, int events,
     return -1;
   }
 
-  if (FD_ISSET (fd, &rset) || FD_ISSET (fd, &wset) || FD_ISSET (fd, &xset)) {
+  if (FD_ISSET (fd, &ml->rset) ||
+      FD_ISSET (fd, &ml->wset) ||
+      FD_ISSET (fd, &ml->xset)) {
     error (g, "fd %d is already registered", fd);
     return -1;
   }
@@ -1359,102 +1998,111 @@ select_add_handle (guestfs_h *g, int fd, int events,
   }
 
   if ((events & GUESTFS_HANDLE_READABLE))
-    FD_SET (fd, &rset);
+    FD_SET (fd, &ml->rset);
   if ((events & GUESTFS_HANDLE_WRITABLE))
-    FD_SET (fd, &wset);
+    FD_SET (fd, &ml->wset);
   if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
-    FD_SET (fd, &xset);
+    FD_SET (fd, &ml->xset);
 
-  if (fd > max_fd) {
-    max_fd = fd;
-    handle_cb_data = safe_realloc (g, handle_cb_data,
-				   sizeof (struct handle_cb_data) * (max_fd+1));
+  if (fd > ml->max_fd) {
+    ml->max_fd = fd;
+    ml->handle_cb_data =
+      safe_realloc (g, ml->handle_cb_data,
+		    sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
   }
-  handle_cb_data[fd].cb = cb;
-  handle_cb_data[fd].data = data;
+  ml->handle_cb_data[fd].cb = cb;
+  ml->handle_cb_data[fd].g = g;
+  ml->handle_cb_data[fd].data = data;
 
-  nr_fds++;
+  ml->nr_fds++;
 
   /* Any integer >= 0 can be the handle, and this is as good as any ... */
   return fd;
 }
 
 static int
-select_remove_handle (guestfs_h *g, int fd)
+select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
 {
-  select_init ();
+  struct select_main_loop *ml = (struct select_main_loop *) mlv;
 
   if (fd < 0 || fd >= FD_SETSIZE) {
     error (g, "fd %d is out of range", fd);
     return -1;
   }
 
-  if (!FD_ISSET (fd, &rset) && !FD_ISSET (fd, &wset) && !FD_ISSET (fd, &xset)) {
+  if (!FD_ISSET (fd, &ml->rset) &&
+      !FD_ISSET (fd, &ml->wset) &&
+      !FD_ISSET (fd, &ml->xset)) {
     error (g, "fd %d was not registered", fd);
     return -1;
   }
 
-  FD_CLR (fd, &rset);
-  FD_CLR (fd, &wset);
-  FD_CLR (fd, &xset);
+  FD_CLR (fd, &ml->rset);
+  FD_CLR (fd, &ml->wset);
+  FD_CLR (fd, &ml->xset);
 
-  if (fd == max_fd) {
-    max_fd--;
-    handle_cb_data = safe_realloc (g, handle_cb_data,
-				   sizeof (struct handle_cb_data) * (max_fd+1));
+  if (fd == ml->max_fd) {
+    ml->max_fd--;
+    ml->handle_cb_data =
+      safe_realloc (g, ml->handle_cb_data,
+		    sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
   }
 
-  nr_fds--;
+  ml->nr_fds--;
 
   return 0;
 }
 
 static int
-select_add_timeout (guestfs_h *g, int interval,
+select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
 		    guestfs_handle_timeout_cb cb, void *data)
 {
-  select_init ();
+  //struct select_main_loop *ml = (struct select_main_loop *) mlv;
 
   abort ();			/* XXX not implemented yet */
 }
 
 static int
-select_remove_timeout (guestfs_h *g, int timer)
+select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
 {
-  select_init ();
+  //struct select_main_loop *ml = (struct select_main_loop *) mlv;
 
   abort ();			/* XXX not implemented yet */
 }
 
-/* Note that main loops can be nested. */
-static int level = 0;
-
-static void
-select_main_loop_run (guestfs_h *g)
+/* The 'g' parameter is just used for error reporting.  Events
+ * for multiple handles can be dispatched by running the main
+ * loop.
+ */
+static int
+select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
 {
-  int old_level, fd, r, events;
+  struct select_main_loop *ml = (struct select_main_loop *) mlv;
+  int fd, r, events;
   fd_set rset2, wset2, xset2;
 
-  select_init ();
+  if (ml->is_running) {
+    error (g, "select_main_loop_run: this cannot be called recursively");
+    return -1;
+  }
+
+  ml->is_running = 1;
 
-  old_level = level++;
-  while (level > old_level) {
-    if (nr_fds == 0) {
-      level = old_level;
+  while (ml->is_running) {
+    if (ml->nr_fds == 0)
       break;
-    }
 
-    rset2 = rset;
-    wset2 = wset;
-    xset2 = xset;
-    r = select (max_fd+1, &rset2, &wset2, &xset2, NULL);
+    rset2 = ml->rset;
+    wset2 = ml->wset;
+    xset2 = ml->xset;
+    r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
     if (r == -1) {
       perrorf (g, "select");
-      level = old_level;
-      break;
+      ml->is_running = 0;
+      return -1;
     }
 
-    for (fd = 0; r > 0 && fd <= max_fd; ++fd) {
+    for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
       events = 0;
       if (FD_ISSET (fd, &rset2))
 	events |= GUESTFS_HANDLE_READABLE;
@@ -1464,22 +2112,27 @@ select_main_loop_run (guestfs_h *g)
 	events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
       if (events) {
 	r--;
-	handle_cb_data[fd].cb (handle_cb_data[fd].data,
-			       fd, fd, events);
+	ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
+				   ml->handle_cb_data[fd].g,
+				   ml->handle_cb_data[fd].data,
+				   fd, fd, events);
       }
     }
   }
+
+  ml->is_running = 0;
+  return 0;
 }
 
-static void
-select_main_loop_quit (guestfs_h *g)
+static int
+select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
 {
-  select_init ();
+  struct select_main_loop *ml = (struct select_main_loop *) mlv;
 
-  if (level == 0) {
-    error (g, "cannot quit, we are not in a main loop");
-    return;
-  }
+  /* Note that legitimately ml->is_running can be zero when
+   * this function is called.
+   */
 
-  level--;
+  ml->is_running = 0;
+  return 0;
 }