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util.signal: Queue up multiple signals, instead of trampling on the previous debug hook (and never clearing our own)

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This commit is contained in:
Matthew Wild 2010-01-10 00:28:48 +00:00
parent e9bd8209bb
commit ca9c6121a2
1 changed files with 44 additions and 20 deletions
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64
util-src/signal.c
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@ -27,6 +27,7 @@
*/
#include <signal.h>
#include <malloc.h>
#include "lua.h"
#include "lauxlib.h"
@ -149,43 +150,66 @@ static const struct lua_signal lua_signals[] = {
{NULL, 0}
};
static int Nsig = 0;
static lua_State *Lsig = NULL;
static lua_Hook Hsig = NULL;
static int Hmask = 0;
static int Hcount = 0;
static struct signal_event
{
int Nsig;
struct signal_event *next_event;
} *signal_queue = NULL;
static struct signal_event *last_event = NULL;
static void sighook(lua_State *L, lua_Debug *ar)
{
lua_pushstring(L, LUA_SIGNAL);
lua_gettable(L, LUA_REGISTRYINDEX);
lua_pushnumber(L, Nsig);
lua_gettable(L, -2);
lua_call(L, 0, 0);
struct signal_event *event;
while((event = signal_queue))
{
lua_pushnumber(L, event->Nsig);
lua_gettable(L, -2);
lua_call(L, 0, 0);
signal_queue = event->next_event;
free(event);
};
/* set the old hook */
lua_pop(L, 1); /* pop lua_signal table */
/* restore the old hook */
lua_sethook(L, Hsig, Hmask, Hcount);
}
static void handle(int sig)
{
Hsig = lua_gethook(Lsig);
Hmask = lua_gethookmask(Lsig);
Hcount = lua_gethookcount(Lsig);
Nsig = sig;
lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
/*
switch (sig)
if(!signal_queue)
{
case SIGABRT: ;
case SIGFPE: ;
case SIGILL: ;
case SIGINT: ;
case SIGSEGV: ;
case SIGTERM: ;
} */
/* Store the existing debug hook (if any) and its parameters */
Hsig = lua_gethook(Lsig);
Hmask = lua_gethookmask(Lsig);
Hcount = lua_gethookcount(Lsig);
signal_queue = malloc(sizeof(struct signal_event));
signal_queue->Nsig = sig;
signal_queue->next_event = NULL;
last_event = signal_queue;
/* Set our new debug hook */
lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
else
{
last_event->next_event = malloc(sizeof(struct signal_event));
last_event->next_event->Nsig = sig;
last_event->next_event->next_event = NULL;
last_event = last_event->next_event;
}
}
/*