unix: add SignalNum to convert signal name to a number
Fixes golang/go#28027
Change-Id: Idf8b554e0fd102fd8b2f2f2ea0fa47bf139303da
Reviewed-on: https://go-review.googlesource.com/c/164778
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
diff --git a/unix/syscall_unix.go b/unix/syscall_unix.go
index 33583a2..0f07d29 100644
--- a/unix/syscall_unix.go
+++ b/unix/syscall_unix.go
@@ -28,6 +28,11 @@
errENOENT error = syscall.ENOENT
)
+var (
+ signalNameMapOnce sync.Once
+ signalNameMap map[string]syscall.Signal
+)
+
// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
@@ -66,6 +71,19 @@
return ""
}
+// SignalNum returns the syscall.Signal for signal named s,
+// or 0 if a signal with such name is not found.
+// The signal name should start with "SIG".
+func SignalNum(s string) syscall.Signal {
+ signalNameMapOnce.Do(func() {
+ signalNameMap = make(map[string]syscall.Signal)
+ for _, signal := range signalList {
+ signalNameMap[signal.name] = signal.num
+ }
+ })
+ return signalNameMap[s]
+}
+
// clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
func clen(n []byte) int {
i := bytes.IndexByte(n, 0)
diff --git a/unix/syscall_unix_test.go b/unix/syscall_unix_test.go
index f6abe8c..264305f 100644
--- a/unix/syscall_unix_test.go
+++ b/unix/syscall_unix_test.go
@@ -98,6 +98,27 @@
}
}
+func TestSignalNum(t *testing.T) {
+ testSignals := []struct {
+ name string
+ want syscall.Signal
+ }{
+ {"SIGHUP", syscall.SIGHUP},
+ {"SIGPIPE", syscall.SIGPIPE},
+ {"SIGSEGV", syscall.SIGSEGV},
+ {"NONEXISTS", 0},
+ }
+ for _, ts := range testSignals {
+ t.Run(fmt.Sprintf("%s/%d", ts.name, ts.want), func(t *testing.T) {
+ got := unix.SignalNum(ts.name)
+ if got != ts.want {
+ t.Errorf("SignalNum(%s) returned %d, want %d", ts.name, got, ts.want)
+ }
+ })
+
+ }
+}
+
func TestFcntlInt(t *testing.T) {
t.Parallel()
file, err := ioutil.TempFile("", "TestFnctlInt")
