Ignore SIGPIPE for systemd, fixes #13.

CHANGELOG.md

@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 - Fix `NewEnvironment` documentation.
+- Ignore SIGPIPE for systemd (#13).
 
 ## [1.4.0] - 2016-09-10
 ### Added

README.md

@@ -76,6 +76,10 @@ Commands using this framework implement these external specifications:
 
     On Windows, this is not implemented.
 
+* `SIGPIPE`
+
+    SIGPIPE is completely ignored.  See [#13](https://github.com/cybozu-go/cmd/issues/13) for details.
+
 ### Environment variables
 
 * `REQUEST_ID_HEADER`

default.go

@@ -9,6 +9,7 @@ var (
 func init() {
 	defaultEnv = NewEnvironment(context.Background())
 	handleSignal(defaultEnv)
+	ignoreSigPipe()
 }
 
 // Stop just declares no further Go will be called.

sigpipe.go

@@ -0,0 +1,12 @@
+// +build !windows
+
+package cmd
+
+import (
+	"os/signal"
+	"syscall"
+)
+
+func ignoreSigPipe() {
+	signal.Ignore(syscall.SIGPIPE)
+}

sigpipe_windows.go

@@ -0,0 +1,3 @@
+package cmd
+
+func ignoreSigPipe() {}