Plan 9 from Bell Labs’s /usr/web/sources/contrib/stallion/root/arm/go/src/runtime/os_freebsd2.go

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Distributed under the MIT License.
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// Copyright 2011 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 freebsd,!amd64

package runtime

//go:nosplit
//go:nowritebarrierrec
func setsig(i uint32, fn uintptr) {
	var sa sigactiont
	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
	sa.sa_mask = sigset_all
	if fn == funcPC(sighandler) {
		fn = funcPC(sigtramp)
	}
	sa.sa_handler = fn
	sigaction(i, &sa, nil)
}

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