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Add some more documentation to process_preparethread to note what's on the

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thread's stack when it is initialized.
This commit is contained in:
david
2009-01-02 19:21:27 +00:00
parent d24ccae322
commit db9e8e751c
1 changed files with 13 additions and 6 deletions
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19
nse_main.cc
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@@ -736,10 +736,17 @@ int process_pickScriptsForPort(lua_State* L, Target* target, Port* port, std::li
return SCRIPT_ENGINE_SUCCESS;
}
/* Create a new lua thread and prepare it for execution
* we store target info in the thread so that the mainloop
* knows where to put the script result. File closure is expected
* at stack index -2.
/* Create a new lua thread and prepare it for execution we store target info in
* the thread so that the mainloop knows where to put the script result. File
* closure is expected at stack index -2. (Index -1 has the boolean result of
* the hostrule or portrule, not used here.)
*
* The thread will have on its stack 3 values if it is a host script, or 4 if it
* is a port script:
* 1: environment table
* 2: action closure
* 3: host table
* 4: port table (port scripts only)
* */
int process_preparethread(lua_State* L, struct thread_record *tr){
@@ -772,9 +779,9 @@ int process_preparethread(lua_State* L, struct thread_record *tr){
tr->runlevel = lua_tonumber(L, -1);
lua_pop(L, 1);
// move the script action closure into the thread
// move the environment table and script action closure into the thread
lua_getfield(L, -1, ACTION); // action closure
lua_xmove(L, thread, 2);
lua_xmove(L, thread, 2); // env, action
lua_pop(L, 1); // filename
lua_setfenv(L, -2); // reset old env
lua_pop(L, 1); // file closure