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Avoid using 'signal' when 'sigaction' is available

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The semantics of 'signal' varies a lot among different implementations;
'sigaction' ensures a more consistent behavior.
This commit is contained in:
Roberto Ierusalimschy 2020-11-24 14:41:50 -03:00
parent 9d067ab73b
commit 131e3fd814
1 changed files with 23 additions and 3 deletions
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26
lua.c
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@ -37,6 +37,26 @@ static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
#if defined(LUA_USE_POSIX) /* { */
/*
** Use 'sigaction' when available.
*/
static void setsignal (int sig, void (*handler)(int)) {
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask); /* do not mask any signal */
sigaction(sig, &sa, NULL);
}
#else /* }{ */
#define setsignal signal
#endif /* } */
/*
** Hook set by signal function to stop the interpreter.
*/
@ -55,7 +75,7 @@ static void lstop (lua_State *L, lua_Debug *ar) {
*/
static void laction (int i) {
int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;
signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
setsignal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
lua_sethook(globalL, lstop, flag, 1);
}
@ -135,9 +155,9 @@ static int docall (lua_State *L, int narg, int nres) {
lua_pushcfunction(L, msghandler); /* push message handler */
lua_insert(L, base); /* put it under function and args */
globalL = L; /* to be available to 'laction' */
signal(SIGINT, laction); /* set C-signal handler */
setsignal(SIGINT, laction); /* set C-signal handler */
status = lua_pcall(L, narg, nres, base);
signal(SIGINT, SIG_DFL); /* reset C-signal handler */
setsignal(SIGINT, SIG_DFL); /* reset C-signal handler */
lua_remove(L, base); /* remove message handler from the stack */
return status;
}