Add Support For Linux

.travis.yml

@@ -20,6 +20,19 @@ matrix:
       git:
         submodules: false
       env: JOB=SWIFTPM_DARWIN
+    - sudo: required
+      dist: trusty
+      os: linux
+      language: generic
+      before_install:
+        - eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"
+      script:
+        - swift --version
+        - swift build
+        - swift test
+      git:
+        submodules: false
+      env: JOB=SWIFTPM
     - os: osx
       osx_image: xcode10.1
       script:

Sources/Task.swift

@@ -406,12 +406,14 @@ extension Task {
 			process.arguments = self.arguments
 
 			if shouldBeTerminatedOnParentExit {
+				#if os(macOS)
 				// This is for terminating subprocesses when the parent process exits.
 				// See https://github.com/Carthage/ReactiveTask/issues/3 for the details.
 				let selector = Selector(("setStartsNewProcessGroup:"))
 				if process.responds(to: selector) {
 					process.perform(selector, with: false as NSNumber)
 				}
+				#endif
 			}
 
 			if let cwd = self.workingDirectoryPath {

Tests/LinuxMain.swift

@@ -0,0 +1,7 @@
+import XCTest
+@testable import ReactiveTaskTests
+
+Quick.QCKMain([
+	StringExtensionSpec.self,
+	TaskSpec.self,
+])