Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include <signal.h>
#include "subcmd-util.h"
#include "sigchain.h"
 
#define SIGCHAIN_MAX_SIGNALS 32
 
struct sigchain_signal {
<------>sigchain_fun *old;
<------>int n;
<------>int alloc;
};
static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
 
static void check_signum(int sig)
{
<------>if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS)
<------><------>die("BUG: signal out of range: %d", sig);
}
 
static int sigchain_push(int sig, sigchain_fun f)
{
<------>struct sigchain_signal *s = signals + sig;
<------>check_signum(sig);
 
<------>ALLOC_GROW(s->old, s->n + 1, s->alloc);
<------>s->old[s->n] = signal(sig, f);
<------>if (s->old[s->n] == SIG_ERR)
<------><------>return -1;
<------>s->n++;
<------>return 0;
}
 
int sigchain_pop(int sig)
{
<------>struct sigchain_signal *s = signals + sig;
<------>check_signum(sig);
<------>if (s->n < 1)
<------><------>return 0;
 
<------>if (signal(sig, s->old[s->n - 1]) == SIG_ERR)
<------><------>return -1;
<------>s->n--;
<------>return 0;
}
 
void sigchain_push_common(sigchain_fun f)
{
<------>sigchain_push(SIGINT, f);
<------>sigchain_push(SIGHUP, f);
<------>sigchain_push(SIGTERM, f);
<------>sigchain_push(SIGQUIT, f);
<------>sigchain_push(SIGPIPE, f);
}