Line data    Source code

       1             : 
       2             : /*
       3             :  * Copyright (C) Xiaozhe Wang (chaoslawful)
       4             :  * Copyright (C) Yichun Zhang (agentzh)
       5             :  */
       6             : 
       7             : 
       8             : #ifndef DDEBUG
       9             : #define DDEBUG 0
      10             : #endif
      11             : #include "ddebug.h"
      12             : 
      13             : 
      14             : #include "ngx_http_lua_exception.h"
      15             : #include "ngx_http_lua_util.h"
      16             : 
      17             : 
      18             : /*  longjmp mark for restoring nginx execution after Lua VM crashing */
      19             : jmp_buf ngx_http_lua_exception;
      20             : 
      21             : /**
      22             :  * Override default Lua panic handler, output VM crash reason to nginx error
      23             :  * log, and restore execution to the nearest jmp-mark.
      24             :  *
      25             :  * @param L Lua state pointer
      26             :  * @retval Long jump to the nearest jmp-mark, never returns.
      27             :  * @note nginx request pointer should be stored in Lua thread's globals table
      28             :  * in order to make logging working.
      29             :  * */
      30             : int
      31           0 : ngx_http_lua_atpanic(lua_State *L)
      32             : {
      33             : #ifdef NGX_LUA_ABORT_AT_PANIC
      34           0 :     abort();
      35             : #else
      36             :     u_char                  *s = NULL;
      37             :     size_t                   len = 0;
      38             : 
      39             :     if (lua_type(L, -1) == LUA_TSTRING) {
      40             :         s = (u_char *) lua_tolstring(L, -1, &len);
      41             :     }
      42             : 
      43             :     if (s == NULL) {
      44             :         s = (u_char *) "unknown reason";
      45             :         len = sizeof("unknown reason") - 1;
      46             :     }
      47             : 
      48             :     ngx_log_stderr(0, "lua atpanic: Lua VM crashed, reason: %*s", len, s);
      49             :     ngx_quit = 1;
      50             : 
      51             :     /*  restore nginx execution */
      52             :     NGX_LUA_EXCEPTION_THROW(1);
      53             : 
      54             :     /* impossible to reach here */
      55             : #endif
      56             : }
      57             : 
      58             : /* vi:set ft=c ts=4 sw=4 et fdm=marker: */