golang sigaction 代码
文件路径：/src/runtime/sigaction.go
/ Copyright 2016 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.
/go:build (linux && !amd64 && !arm64 && !ppc64le) || (freebsd && !amd64)
package runtime
/ This version is used on Linux and FreeBSD systems on which we don't
/ use cgo to call the C version of sigaction.
/go:nosplit
/go:nowritebarrierrec
func sigaction(sig uint32, new, old *sigactiont) {
sysSigaction(sig, new, old)
}