cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sigchain.c (1038B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <signal.h>
      3#include "subcmd-util.h"
      4#include "sigchain.h"
      5
      6#define SIGCHAIN_MAX_SIGNALS 32
      7
      8struct sigchain_signal {
      9	sigchain_fun *old;
     10	int n;
     11	int alloc;
     12};
     13static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
     14
     15static void check_signum(int sig)
     16{
     17	if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS)
     18		die("BUG: signal out of range: %d", sig);
     19}
     20
     21static int sigchain_push(int sig, sigchain_fun f)
     22{
     23	struct sigchain_signal *s = signals + sig;
     24	check_signum(sig);
     25
     26	ALLOC_GROW(s->old, s->n + 1, s->alloc);
     27	s->old[s->n] = signal(sig, f);
     28	if (s->old[s->n] == SIG_ERR)
     29		return -1;
     30	s->n++;
     31	return 0;
     32}
     33
     34int sigchain_pop(int sig)
     35{
     36	struct sigchain_signal *s = signals + sig;
     37	check_signum(sig);
     38	if (s->n < 1)
     39		return 0;
     40
     41	if (signal(sig, s->old[s->n - 1]) == SIG_ERR)
     42		return -1;
     43	s->n--;
     44	return 0;
     45}
     46
     47void sigchain_push_common(sigchain_fun f)
     48{
     49	sigchain_push(SIGINT, f);
     50	sigchain_push(SIGHUP, f);
     51	sigchain_push(SIGTERM, f);
     52	sigchain_push(SIGQUIT, f);
     53	sigchain_push(SIGPIPE, f);
     54}