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/*
* 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));
}
};
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