[Process] Implement terminationReason

Docs/Status.md

@@ -271,10 +271,10 @@ There is no _Complete_ status for test coverage because there are always additio
 
     | Entity Name      | Status          | Test Coverage | Notes                                                                                                                     |
     |------------------|-----------------|---------------|---------------------------------------------------------------------------------------------------------------------------|
-    | `FileHandle`     | Mostly Complete | Incomplete    | `NSCoding`, and background operations remain unimplemented                                                  |
+    | `FileHandle`     | Mostly Complete | Incomplete    | `NSCoding`, and background operations remain unimplemented                                                                |
     | `Pipe`           | Complete        | Incomplete    |                                                                                                                           |
     | `FileManager`    | Incomplete      | Incomplete    | URL searches, relationship lookups, item copying, cross-device moving, recursive linking, and others remain unimplemented |
-    | `Process`        | Mostly Complete | Substantial   | `interrupt()`, `terminate()`, `suspend()`, `resume()`, and `terminationReason` remain unimplemented                       |
+    | `Process`        | Mostly Complete | Substantial   | `interrupt()`, `terminate()`, `suspend()`, and `resume()` remain unimplemented                                            |
     | `Bundle`         | Mostly Complete | Incomplete    | `allBundles`, `init(for:)`, `unload()`, `classNamed()`, and `principalClass` remain unimplemented                         |
     | `ProcessInfo`    | Complete        | Substantial   |                                                                                                                           |
     | `Thread`         | Incomplete      | Incomplete    | `isMainThread`, `mainThread`, `name`, `callStackReturnAddresses`, and `callStackSymbols` remain unimplemented             |

Foundation/Process.swift

@@ -23,10 +23,26 @@ extension Process {
     }
 }
 
-private func WEXITSTATUS(_ status: CInt) -> CInt {
+private func WIFEXITED(_ status: Int32) -> Bool {
+    return _WSTATUS(status) == 0
+}
+
+private func _WSTATUS(_ status: Int32) -> Int32 {
+    return status & 0x7f
+}
+
+private func WIFSIGNALED(_ status: Int32) -> Bool {
+    return (_WSTATUS(status) != 0) && (_WSTATUS(status) != 0x7f)
+}
+
+private func WEXITSTATUS(_ status: Int32) -> Int32 {
     return (status >> 8) & 0xff
 }
 
+private func WTERMSIG(_ status: Int32) -> Int32 {
+    return status & 0x7f
+}
+
 private var managerThreadRunLoop : RunLoop? = nil
 private var managerThreadRunLoopIsRunning = false
 private var managerThreadRunLoopIsRunningCondition = NSCondition()
@@ -280,8 +296,15 @@ open class Process: NSObject {
                 waitResult = waitpid( process.processIdentifier, &exitCode, 0)
 #endif
             } while ( (waitResult == -1) && (errno == EINTR) )
-
-            process.terminationStatus = WEXITSTATUS( exitCode )
+
+            if WIFSIGNALED(exitCode) {
+                process.terminationStatus = WTERMSIG(exitCode)
+                process.terminationReason = .uncaughtSignal
+            } else {
+                assert(WIFEXITED(exitCode))
+                process.terminationStatus = WEXITSTATUS(exitCode)
+                process.terminationReason = .exit
+            }
 
             // If a termination handler has been set, invoke it on a background thread
 
@@ -429,7 +452,7 @@ open class Process: NSObject {
     open private(set) var isRunning: Bool = false
 
     open private(set) var terminationStatus: Int32 = 0
-    open var terminationReason: TerminationReason { NSUnimplemented() }
+    open private(set) var terminationReason: TerminationReason = .exit
 
     /*
     A block to be invoked when the process underlying the Process terminates.  Setting the block to nil is valid, and stops the previous block from being invoked, as long as it hasn't started in any way.  The Process is passed as the argument to the block so the block does not have to capture, and thus retain, it.  The block is copied when set.  Only one termination handler block can be set at any time.  The execution context in which the block is invoked is undefined.  If the Process has already finished, the block is executed immediately/soon (not necessarily on the current thread).  If a terminationHandler is set on an Process, the ProcessDidTerminateNotification notification is not posted for that process.  Also note that -waitUntilExit won't wait until the terminationHandler has been fully executed.  You cannot use this property in a concrete subclass of Process which hasn't been updated to include an implementation of the storage and use of it.  

TestFoundation/TestProcess.swift

@@ -24,6 +24,7 @@ class TestProcess : XCTestCase {
                    ("test_exit100" , test_exit100),
                    ("test_sleep2", test_sleep2),
                    ("test_sleep2_exit1", test_sleep2_exit1),
+                   ("test_terminationReason_uncaughtSignal", test_terminationReason_uncaughtSignal),
                    ("test_pipe_stdin", test_pipe_stdin),
                    ("test_pipe_stdout", test_pipe_stdout),
                    ("test_pipe_stderr", test_pipe_stderr),
@@ -47,6 +48,7 @@ class TestProcess : XCTestCase {
         process.launch()
         process.waitUntilExit()
         XCTAssertEqual(process.terminationStatus, 0)
+        XCTAssertEqual(process.terminationReason, .exit)
     }
 
     func test_exit1() {
@@ -59,6 +61,7 @@ class TestProcess : XCTestCase {
         process.launch()
         process.waitUntilExit()
         XCTAssertEqual(process.terminationStatus, 1)
+        XCTAssertEqual(process.terminationReason, .exit)
     }
 
     func test_exit100() {
@@ -71,6 +74,7 @@ class TestProcess : XCTestCase {
         process.launch()
         process.waitUntilExit()
         XCTAssertEqual(process.terminationStatus, 100)
+        XCTAssertEqual(process.terminationReason, .exit)
     }
 
     func test_sleep2() {
@@ -83,6 +87,7 @@ class TestProcess : XCTestCase {
         process.launch()
         process.waitUntilExit()
         XCTAssertEqual(process.terminationStatus, 0)
+        XCTAssertEqual(process.terminationReason, .exit)
     }
 
     func test_sleep2_exit1() {
@@ -95,8 +100,20 @@ class TestProcess : XCTestCase {
         process.launch()
         process.waitUntilExit()
         XCTAssertEqual(process.terminationStatus, 1)
+        XCTAssertEqual(process.terminationReason, .exit)
     }
 
+    func test_terminationReason_uncaughtSignal() {
+        let process = Process()
+
+        process.launchPath = "/bin/bash"
+        process.arguments = ["-c", "kill -TERM $$"]
+
+        process.launch()
+        process.waitUntilExit()
+        XCTAssertEqual(process.terminationStatus, 15)
+        XCTAssertEqual(process.terminationReason, .uncaughtSignal)
+    }
 
     func test_pipe_stdin() {
         let process = Process()