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#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
// Fix signal macro compatibility with signal.h of MS VC++:
#ifdef WIN32
#define signal win32_signal
#endif
#include <signal.h>
// Get back Perl marcro value defined ad XSUB.h:
#ifdef WIN32
#define signal PerlProc_signal
#endif
#endif
static struct pe_watcher_vtbl pe_signal_vtbl;
/* GLOBALS: Sigvalid Sigring Sigstat Sigslot */
static U32 Sigvalid[1+NSIG/32]; /*assume 32bit; doesn't matter*/
#define PE_SIGVALID(sig) (Sigvalid[sig>>5] & (1 << ((sig) & 0x1f)))
#define PE_SIGVALID_off(sig) Sigvalid[sig>>5] &= ~(1 << ((sig) & 0x1f))
struct pe_sig_stat {
U32 Hits;
U16 hits[NSIG];
};
typedef struct pe_sig_stat pe_sig_stat;
static int Sigslot;
static pe_sig_stat Sigstat[2];
static pe_ring Sigring[NSIG];
/* /GLOBALS */
static Signal_t process_sighandler(int sig) {
pe_sig_stat *st = &Sigstat[Sigslot];
++st->Hits;
++st->hits[sig];
}
static pe_watcher *pe_signal_allocate(HV *stash, SV *temple) {
pe_signal *ev;
EvNew(5, ev, 1, pe_signal);
ev->base.vtbl = &pe_signal_vtbl;
PE_RING_INIT(&ev->sring, ev);
ev->signal = 0;
pe_watcher_init(&ev->base, stash, temple);
WaREPEAT_on(ev);
WaINVOKE1_off(ev);
return (pe_watcher*) ev;
}
static void pe_signal_dtor(pe_watcher *ev) {
pe_watcher_dtor(ev);
EvFree(5, ev);
}
static char *pe_signal_start(pe_watcher *_ev, int repeat) {
pe_signal *ev = (pe_signal*) _ev;
int sig = ev->signal;
if (!_ev->callback)
return "without callback";
if (sig == 0)
return "without signal";
if (PE_RING_EMPTY(&Sigring[sig]))
rsignal(sig, (Sighandler_t)process_sighandler);
PE_RING_UNSHIFT(&ev->sring, &Sigring[sig]);
return 0;
}
static void pe_signal_stop(pe_watcher *_ev) {
pe_signal *ev = (pe_signal*) _ev;
int sig = ev->signal;
PE_RING_DETACH(&ev->sring);
if (PE_RING_EMPTY(&Sigring[sig])) {
rsignal(sig, (Sighandler_t)SIG_DFL);
Sigstat[0].hits[sig] = 0;
Sigstat[1].hits[sig] = 0;
}
}
WKEYMETH(_signal_signal) {
pe_signal *sg = (pe_signal*) ev;
if (nval) {
STRLEN n_a;
int active = WaPOLLING(ev);
int sig = whichsig(SvPV(nval, n_a));
/*warn("whichsig(%s) = %d", SvPV(nval,na), sig); /**/
if (sig == 0)
croak("Unrecognized signal '%s'", SvPV(nval, n_a));
if (!PE_SIGVALID(sig))
croak("Signal '%s' cannot be caught", SvPV(nval, n_a));
if (active) pe_watcher_off(ev);
sg->signal = sig;
if (active) pe_watcher_on(ev, 0);
}
{
dSP;
XPUSHs(sg->signal > 0?
sv_2mortal(newSVpv(PL_sig_name[sg->signal],0)) : &PL_sv_undef);
PUTBACK;
}
}
static void _signal_asynccheck(pe_sig_stat *st) {
int xx, got;
pe_watcher *wa;
for (xx = 1; xx < NSIG; xx++) {
if (!st->hits[xx])
continue;
got = st->hits[xx];
wa = (pe_watcher*) Sigring[xx].next->self;
while (wa) {
pe_event *ev = (*wa->vtbl->new_event)(wa);
ev->hits += got;
queueEvent(ev);
wa = (pe_watcher*) ((pe_signal*)wa)->sring.next->self;
}
st->hits[xx] = 0;
}
Zero(st, 1, struct pe_sig_stat);
}
/* This implementation gives no race conditions, assuming
no kernel-level threads. */
static void pe_signal_asynccheck() {
pe_sig_stat *st;
Sigslot = 1;
st = &Sigstat[0];
if (st->Hits) _signal_asynccheck(st);
Sigslot = 0;
st = &Sigstat[1];
if (st->Hits) _signal_asynccheck(st);
}
static void boot_signal() {
int xx;
int sig;
char **sigp;
/* it is crufty to hardcode this list */
static char *nohandle[] = { "KILL", "STOP", "ZERO", 0 };
pe_watcher_vtbl *vt = &pe_signal_vtbl;
Zero(&Sigstat[0], 1, pe_sig_stat);
Zero(&Sigstat[1], 1, pe_sig_stat);
Sigslot = 0;
for (xx=0; xx < NSIG; xx++) {
PE_RING_INIT(&Sigring[xx], 0);
}
memset(Sigvalid, ~0, sizeof(Sigvalid));
PE_SIGVALID_off(0);
sigp = nohandle;
while (*sigp) {
sig = whichsig(*sigp);
if (sig) PE_SIGVALID_off(sig);
++sigp;
}
memcpy(vt, &pe_watcher_base_vtbl, sizeof(pe_watcher_base_vtbl));
vt->dtor = pe_signal_dtor;
vt->start = pe_signal_start;
vt->stop = pe_signal_stop;
pe_register_vtbl(vt, gv_stashpv("Event::signal",1), &event_vtbl);
}
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