| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "Exec" |
| |
| #include "JNIHelp.h" |
| #include "jni.h" |
| #include "utils/Log.h" |
| #include "utils/misc.h" |
| #include "android_runtime/AndroidRuntime.h" |
| |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <termios.h> |
| |
| namespace android |
| { |
| |
| static jclass class_fileDescriptor; |
| static jfieldID field_fileDescriptor_descriptor; |
| static jmethodID method_fileDescriptor_init; |
| |
| |
| static int create_subprocess(const char *cmd, const char *arg0, const char *arg1, |
| int* pProcessId) |
| { |
| char *devname; |
| int ptm; |
| pid_t pid; |
| |
| ptm = open("/dev/ptmx", O_RDWR); // | O_NOCTTY); |
| if(ptm < 0){ |
| LOGE("[ cannot open /dev/ptmx - %s ]\n",strerror(errno)); |
| return -1; |
| } |
| fcntl(ptm, F_SETFD, FD_CLOEXEC); |
| |
| if(grantpt(ptm) || unlockpt(ptm) || |
| ((devname = (char*) ptsname(ptm)) == 0)){ |
| LOGE("[ trouble with /dev/ptmx - %s ]\n", strerror(errno)); |
| return -1; |
| } |
| |
| pid = fork(); |
| if(pid < 0) { |
| LOGE("- fork failed: %s -\n", strerror(errno)); |
| return -1; |
| } |
| |
| if(pid == 0){ |
| int pts; |
| |
| setsid(); |
| |
| pts = open(devname, O_RDWR); |
| if(pts < 0) exit(-1); |
| |
| dup2(pts, 0); |
| dup2(pts, 1); |
| dup2(pts, 2); |
| |
| close(ptm); |
| |
| execl(cmd, cmd, arg0, arg1, NULL); |
| exit(-1); |
| } else { |
| *pProcessId = (int) pid; |
| return ptm; |
| } |
| } |
| |
| |
| static jobject android_os_Exec_createSubProcess(JNIEnv *env, jobject clazz, |
| jstring cmd, jstring arg0, jstring arg1, jintArray processIdArray) |
| { |
| const jchar* str = cmd ? env->GetStringCritical(cmd, 0) : 0; |
| String8 cmd_8; |
| if (str) { |
| cmd_8 = String8(str, env->GetStringLength(cmd)); |
| env->ReleaseStringCritical(cmd, str); |
| } |
| |
| str = arg0 ? env->GetStringCritical(arg0, 0) : 0; |
| const char* arg0Str = 0; |
| String8 arg0_8; |
| if (str) { |
| arg0_8 = String8(str, env->GetStringLength(arg0)); |
| env->ReleaseStringCritical(arg0, str); |
| arg0Str = arg0_8.string(); |
| } |
| |
| str = arg1 ? env->GetStringCritical(arg1, 0) : 0; |
| const char* arg1Str = 0; |
| String8 arg1_8; |
| if (str) { |
| arg1_8 = String8(str, env->GetStringLength(arg1)); |
| env->ReleaseStringCritical(arg1, str); |
| arg1Str = arg1_8.string(); |
| } |
| |
| int procId; |
| int ptm = create_subprocess(cmd_8.string(), arg0Str, arg1Str, &procId); |
| |
| if (processIdArray) { |
| int procIdLen = env->GetArrayLength(processIdArray); |
| if (procIdLen > 0) { |
| jboolean isCopy; |
| |
| int* pProcId = (int*) env->GetPrimitiveArrayCritical(processIdArray, &isCopy); |
| if (pProcId) { |
| *pProcId = procId; |
| env->ReleasePrimitiveArrayCritical(processIdArray, pProcId, 0); |
| } |
| } |
| } |
| |
| jobject result = env->NewObject(class_fileDescriptor, method_fileDescriptor_init); |
| |
| if (!result) { |
| LOGE("Couldn't create a FileDescriptor."); |
| } |
| else { |
| env->SetIntField(result, field_fileDescriptor_descriptor, ptm); |
| } |
| |
| return result; |
| } |
| |
| |
| static void android_os_Exec_setPtyWindowSize(JNIEnv *env, jobject clazz, |
| jobject fileDescriptor, jint row, jint col, jint xpixel, jint ypixel) |
| { |
| int fd; |
| struct winsize sz; |
| |
| fd = jniGetFDFromFileDescriptor(env, fileDescriptor); |
| |
| if (env->ExceptionOccurred() != NULL) { |
| return; |
| } |
| |
| sz.ws_row = row; |
| sz.ws_col = col; |
| sz.ws_xpixel = xpixel; |
| sz.ws_ypixel = ypixel; |
| |
| ioctl(fd, TIOCSWINSZ, &sz); |
| } |
| |
| static int android_os_Exec_waitFor(JNIEnv *env, jobject clazz, |
| jint procId) { |
| int status; |
| waitpid(procId, &status, 0); |
| int result = 0; |
| if (WIFEXITED(status)) { |
| result = WEXITSTATUS(status); |
| } |
| return result; |
| } |
| |
| static JNINativeMethod method_table[] = { |
| { "createSubprocess", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;[I)Ljava/io/FileDescriptor;", |
| (void*) android_os_Exec_createSubProcess }, |
| { "setPtyWindowSize", "(Ljava/io/FileDescriptor;IIII)V", |
| (void*) android_os_Exec_setPtyWindowSize}, |
| { "waitFor", "(I)I", |
| (void*) android_os_Exec_waitFor} |
| }; |
| |
| int register_android_os_Exec(JNIEnv *env) |
| { |
| class_fileDescriptor = env->FindClass("java/io/FileDescriptor"); |
| |
| if (class_fileDescriptor == NULL) { |
| LOGE("Can't find java/io/FileDescriptor"); |
| return -1; |
| } |
| |
| field_fileDescriptor_descriptor = env->GetFieldID(class_fileDescriptor, "descriptor", "I"); |
| |
| if (field_fileDescriptor_descriptor == NULL) { |
| LOGE("Can't find FileDescriptor.descriptor"); |
| return -1; |
| } |
| |
| method_fileDescriptor_init = env->GetMethodID(class_fileDescriptor, "<init>", "()V"); |
| if (method_fileDescriptor_init == NULL) { |
| LOGE("Can't find FileDescriptor.init"); |
| return -1; |
| } |
| |
| return AndroidRuntime::registerNativeMethods( |
| env, "android/os/Exec", |
| method_table, NELEM(method_table)); |
| } |
| |
| }; |