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lua: Print the error thrown by callbacks.

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Richard W.M. Jones
2012-11-20 14:23:35 +00:00
parent efb2d07ad6
commit 8f80f9fdae
1 changed files with 18 additions and 2 deletions
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20
generator/lua.ml
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@@ -84,6 +84,8 @@ static int64_t get_int64 (lua_State *L, int index);
static void push_int64 (lua_State *L, int64_t i64);
static void push_int64_array (lua_State *L, const int64_t *array, size_t len);
static void print_any (lua_State *L, int index, FILE *out);
static void event_callback_wrapper (guestfs_h *g, void *esvp, uint64_t event, int eh, int flags, const char *buf, size_t buf_len, const uint64_t *array, size_t array_len);
static uint64_t get_event (lua_State *L, int index);
static uint64_t get_event_bitmask (lua_State *L, int index);
@@ -344,10 +346,11 @@ event_callback_wrapper (guestfs_h *g,
case 0: /* call ok - do nothing */
break;
case LUA_ERRRUN:
fprintf (stderr, \"lua-guestfs: %%s: unexpected error in event handler\\n\",
fprintf (stderr, \"lua-guestfs: %%s: unexpected error in event handler: \",
__func__);
/* XXX could print the error instead of throwing it away */
print_any (L, -1, stderr);
lua_pop (L, 1);
fprintf (stderr, \"\\n\");
break;
case LUA_ERRERR: /* can probably never happen */
fprintf (stderr, \"lua-guestfs: %%s: error calling error handler\\n\",
@@ -683,6 +686,19 @@ push_int64_array (lua_State *L, const int64_t *array, size_t len)
}
}
/* Use Lua tostring method to print out any. Useful for debugging
* these bindings, but also used if a callback throws an exception.
*/
static void
print_any (lua_State *L, int index, FILE *out)
{
lua_getfield (L, LUA_GLOBALSINDEX, \"tostring\");
lua_pushvalue (L, index >= 0 ? index : index-1);
lua_call (L, 1, 1);
fprintf (out, \"%%s\", luaL_checkstring (L, -1));
lua_pop (L, 1);
}
";
(* Code to handle events. *)