mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 00:01:35 +00:00
864709302a
Several people have suggested that 'perf' has become a full-fledged tool that should be moved out of Documentation/. Move it to the (new) tools/ directory. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
53 lines
969 B
C
53 lines
969 B
C
#include "sigchain.h"
|
|
#include "cache.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);
|
|
}
|
|
|
|
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);
|
|
}
|