- Added Process.getPid() and Terminal.isTerminal().

- Added a test command-line app.

src/main/cpp/posixFunctions.c

@@ -0,0 +1,50 @@
+#include "native.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+
+void markFailed(JNIEnv *env, jobject result) {
+    jclass destClass = env->GetObjectClass(result);
+    jfieldID errnoField = env->GetFieldID(destClass, "errno", "I");
+    env->SetIntField(result, errnoField, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_net_rubygrapefruit_platform_internal_PosixFileFunctions_chmod(JNIEnv *env, jclass target, jstring path, jint mode, jobject result) {
+    const char* pathUtf8 = env->GetStringUTFChars(path, NULL);
+    int retval = chmod(pathUtf8, mode);
+    if (retval != 0) {
+        markFailed(env, result);
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_net_rubygrapefruit_platform_internal_PosixFileFunctions_stat(JNIEnv *env, jclass target, jstring path, jobject dest, jobject result) {
+    struct stat fileInfo;
+    const char* pathUtf8 = env->GetStringUTFChars(path, NULL);
+    int retval = stat(pathUtf8, &fileInfo);
+    if (retval != 0) {
+        markFailed(env, result);
+        return;
+    }
+    jclass destClass = env->GetObjectClass(dest);
+    jfieldID modeField = env->GetFieldID(destClass, "mode", "I");
+    env->SetIntField(dest, modeField, 0777 & fileInfo.st_mode);
+}
+
+JNIEXPORT jint JNICALL
+Java_net_rubygrapefruit_platform_internal_PosixProcessFunctions_getPid(JNIEnv *env, jclass target) {
+    return getpid();
+}
+
+JNIEXPORT jboolean JNICALL
+Java_net_rubygrapefruit_platform_internal_PosixTerminalFunctions_isatty(JNIEnv *env, jclass target, jint output) {
+    switch (output) {
+    case 0:
+    case 1:
+        return isatty(output+1) ? JNI_TRUE : JNI_FALSE;
+    default:
+        return JNI_FALSE;
+    }
+}