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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux openbsd netbsd
#include "runtime.h"
#include "defs_GOOS_GOARCH.h"
#include "os_GOOS.h"
#include "signal_unix.h"
extern SigTab runtime·sigtab[];
void
runtime·initsig(void)
{
int32 i;
SigTab *t;
// First call: basic setup.
for(i = 0; i<NSIG; i++) {
t = &runtime·sigtab[i];
if((t->flags == 0) || (t->flags & SigDefault))
continue;
// For some signals, we respect an inherited SIG_IGN handler
// rather than insist on installing our own default handler.
// Even these signals can be fetched using the os/signal package.
switch(i) {
case SIGHUP:
case SIGINT:
if(runtime·getsig(i) == SIG_IGN) {
t->flags = SigNotify | SigIgnored;
continue;
}
}
t->flags |= SigHandling;
runtime·setsig(i, runtime·sighandler, true);
}
}
void
runtime·sigenable(uint32 sig)
{
SigTab *t;
if(sig >= NSIG)
return;
t = &runtime·sigtab[sig];
if((t->flags & SigNotify) && !(t->flags & SigHandling)) {
t->flags |= SigHandling;
if(runtime·getsig(sig) == SIG_IGN)
t->flags |= SigIgnored;
runtime·setsig(sig, runtime·sighandler, true);
}
}
void
runtime·sigdisable(uint32 sig)
{
SigTab *t;
if(sig >= NSIG)
return;
t = &runtime·sigtab[sig];
if((t->flags & SigNotify) && (t->flags & SigHandling)) {
t->flags &= ~SigHandling;
if(t->flags & SigIgnored)
runtime·setsig(sig, SIG_IGN, true);
else
runtime·setsig(sig, SIG_DFL, true);
}
}
void
runtime·resetcpuprofiler(int32 hz)
{
Itimerval it;
runtime·memclr((byte*)&it, sizeof it);
if(hz == 0) {
runtime·setitimer(ITIMER_PROF, &it, nil);
} else {
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 1000000 / hz;
it.it_value = it.it_interval;
runtime·setitimer(ITIMER_PROF, &it, nil);
}
m->profilehz = hz;
}
void
os·sigpipe(void)
{
runtime·setsig(SIGPIPE, SIG_DFL, false);
runtime·raise(SIGPIPE);
}
void
runtime·crash(void)
{
#ifdef GOOS_darwin
// OS X core dumps are linear dumps of the mapped memory,
// from the first virtual byte to the last, with zeros in the gaps.
// Because of the way we arrange the address space on 64-bit systems,
// this means the OS X core file will be >128 GB and even on a zippy
// workstation can take OS X well over an hour to write (uninterruptible).
// Save users from making that mistake.
if(sizeof(void*) == 8)
return;
#endif
runtime·setsig(SIGABRT, SIG_DFL, false);
runtime·raise(SIGABRT);
}
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