Imported Upstream version 1.4upstream/1.4

1 files changed, 119 insertions, 0 deletions

diff --git a/src/runtime/signal_unix.c b/src/runtime/signal_unix.c
new file mode 100644
index 000000000..0e33ece49
--- /dev/null
+++ b/src/runtime/signal_unix.c
@@ -0,0 +1,119 @@
+// 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 netbsd openbsd solaris
+
+#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);
+	}
+	g->m->profilehz = hz;
+}
+
+void
+runtime·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·unblocksignals();
+	runtime·setsig(SIGABRT, SIG_DFL, false);
+	runtime·raise(SIGABRT);
+}