Implemented 'mount' and 'touch' commands.

[libguestfs.git] / src / guestfs.c

diff --git a/src/guestfs.c b/src/guestfs.c
index 309cd15..0c0a37f 100644 (file)
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -67,6 +67,8 @@ 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 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);
@@ -95,6 +97,8 @@ enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
 
 struct guestfs_h
 {
+  struct guestfs_h *next;      /* Linked list of open handles. */
+
   /* State: see the state machine diagram in the man page guestfs(3). */
   enum state state;
 
@@ -144,6 +148,9 @@ struct guestfs_h
   int msg_next_serial;
 };
 
+static guestfs_h *handles = NULL;
+static int atexit_handler_set = 0;
+
 guestfs_h *
 guestfs_create (void)
 {
@@ -170,6 +177,26 @@ guestfs_create (void)
   str = getenv ("LIBGUESTFS_DEBUG");
   g->verbose = str != NULL && strcmp (str, "1") == 0;
 
+  /* Start with large serial numbers so they are easy to spot
+   * inside the protocol.
+   */
+  g->msg_next_serial = 0x00123400;
+
+  /* Link the handles onto a global list.  This is the one area
+   * where the library needs to be made thread-safe. (XXX)
+   */
+  /* acquire mutex (XXX) */
+  g->next = handles;
+  handles = g;
+  if (!atexit_handler_set) {
+    atexit (close_handles);
+    atexit_handler_set = 1;
+  }
+  /* release mutex (XXX) */
+
+  if (g->verbose)
+    fprintf (stderr, "new guestfs handle %p\n", g);
+
   return g;
 }
 
@@ -178,6 +205,7 @@ guestfs_close (guestfs_h *g)
 {
   int i;
   char filename[256];
+  guestfs_h *gg;
 
   if (g->state == NO_HANDLE) {
     /* Not safe to call 'error' here, so ... */
@@ -185,6 +213,9 @@ guestfs_close (guestfs_h *g)
     return;
   }
 
+  if (g->verbose)
+    fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
+
   /* Remove any handlers that might be called back before we kill the
    * subprocess.
    */
@@ -211,9 +242,26 @@ guestfs_close (guestfs_h *g)
   /* Mark the handle as dead before freeing it. */
   g->state = NO_HANDLE;
 
+  /* acquire mutex (XXX) */
+  if (handles == g)
+    handles = g->next;
+  else {
+    for (gg = handles; gg->next != g; gg = gg->next)
+      ;
+    gg->next = g->next;
+  }
+  /* release mutex (XXX) */
+
   free (g);
 }
 
+/* Close all open handles (called from atexit(3)). */
+static void
+close_handles (void)
+{
+  while (handles) guestfs_close (handles);
+}
+
 static void
 default_error_cb (guestfs_h *g, void *data, const char *msg)
 {
@@ -492,7 +540,8 @@ guestfs_launch (guestfs_h *g)
              "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
 
     add_cmdline (g, "-m");
-    add_cmdline (g, "384");    /* XXX Choose best size. */
+    add_cmdline (g, "384");      /* XXX Choose best size. */
+    add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
     add_cmdline (g, "-kernel");
     add_cmdline (g, (char *) kernel);
     add_cmdline (g, "-initrd");
@@ -525,6 +574,8 @@ guestfs_launch (guestfs_h *g)
     close (rfd[0]);
     dup (wfd[0]);
     dup (rfd[1]);
+    close (wfd[0]);
+    close (rfd[1]);
 
 #if 0
     /* Set up a new process group, so we can signal this process
@@ -862,13 +913,13 @@ sock_read_event (void *data, int watch, int fd, int events)
     goto cleanup;
   }
 
-  if (g->msg_in_size < len) return; /* Need more of this message. */
+  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 > len) {
-    error (g, "len = %d, but msg_in_size = %d", len, g->msg_in_size);
+  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;
   }
 
@@ -944,7 +995,7 @@ 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", n);
+    fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
 
   free (g->msg_out);
   g->msg_out_pos = g->msg_out_size = 0;
@@ -1047,6 +1098,38 @@ dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
   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)
+{
+  if (hdr->prog != GUESTFS_PROGRAM) {
+    error (g, "wrong program (%d/%d)", hdr->prog, GUESTFS_PROGRAM);
+    return -1;
+  }
+  if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
+    error (g, "wrong protocol version (%d/%d)",
+          hdr->vers, GUESTFS_PROTOCOL_VERSION);
+    return -1;
+  }
+  if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
+    error (g, "unexpected message direction (%d/%d)",
+          hdr->direction, GUESTFS_DIRECTION_REPLY);
+    return -1;
+  }
+  if (hdr->proc != proc_nr) {
+    error (g, "unexpected procedure number (%d/%d)", hdr->proc, proc_nr);
+    return -1;
+  }
+  if (hdr->serial != serial) {
+    error (g, "unexpected serial (%d/%d)", hdr->serial, serial);
+    return -1;
+  }
+
+  return 0;
+}
+
 /* The high-level actions are autogenerated by generator.ml.  Include
  * them here.
  */