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annotate app/src/main/jni/Exec/com_google_ase_Exec.cpp @ 483:84bab82d1f58
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| author | Carl Byington <carl@five-ten-sg.com> |
|---|---|
| date | Mon, 01 Jun 2020 15:47:47 -0700 |
| parents | 105815cce146 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright (C) 2007 The Android Open Source Project | |
| 3 * | |
| 4 * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 * you may not use this file except in compliance with the License. | |
| 6 * You may obtain a copy of the License at | |
| 7 * | |
| 8 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 * | |
| 10 * Unless required by applicable law or agreed to in writing, software | |
| 11 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 * See the License for the specific language governing permissions and | |
| 14 * limitations under the License. | |
| 15 */ | |
| 16 | |
| 17 #include "com_google_ase_Exec.h" | |
| 18 | |
| 19 #include <errno.h> | |
| 20 #include <fcntl.h> | |
| 21 #include <stdlib.h> | |
| 22 #include <sys/ioctl.h> | |
| 23 #include <sys/types.h> | |
| 24 #include <sys/wait.h> | |
| 25 #include <termios.h> | |
| 26 #include <unistd.h> | |
|
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105815cce146
minimum version android 5, target and compile version api 28
Carl Byington <carl@five-ten-sg.com>
parents:
438
diff
changeset
|
27 #include <string.h> |
| 0 | 28 |
| 29 #include "android/log.h" | |
| 30 | |
| 31 #define LOG_TAG "Exec" | |
| 32 #define LOG(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__) | |
| 33 | |
| 34 void JNU_ThrowByName(JNIEnv * env, const char *name, const char *msg) { | |
| 35 jclass clazz = env->FindClass(name); | |
| 36 if (clazz != NULL) { | |
| 37 env->ThrowNew(clazz, msg); | |
| 38 } | |
| 39 env->DeleteLocalRef(clazz); | |
| 40 } | |
| 41 | |
| 42 char *JNU_GetStringNativeChars(JNIEnv * env, jstring jstr) { | |
| 43 if (jstr == NULL) { | |
| 44 return NULL; | |
| 45 } | |
| 46 jbyteArray bytes = 0; | |
| 47 jthrowable exc; | |
| 48 char *result = 0; | |
| 49 if (env->EnsureLocalCapacity(2) < 0) { | |
| 50 return 0; /* out of memory error */ | |
| 51 } | |
| 52 jclass Class_java_lang_String = env->FindClass("java/lang/String"); | |
| 53 jmethodID MID_String_getBytes = env->GetMethodID(Class_java_lang_String, "getBytes", "()[B"); | |
| 54 bytes = (jbyteArray) env->CallObjectMethod(jstr, MID_String_getBytes); | |
| 55 exc = env->ExceptionOccurred(); | |
| 56 if (!exc) { | |
| 57 jint len = env->GetArrayLength(bytes); | |
| 58 result = (char *) malloc(len + 1); | |
| 59 if (result == 0) { | |
| 60 JNU_ThrowByName(env, "java/lang/OutOfMemoryError", 0); | |
| 61 env->DeleteLocalRef(bytes); | |
| 62 return 0; | |
| 63 } | |
| 64 env->GetByteArrayRegion(bytes, 0, len, (jbyte *) result); | |
| 65 result[len] = 0; /* NULL-terminate */ | |
| 66 } else { | |
| 67 env->DeleteLocalRef(exc); | |
| 68 } | |
| 69 env->DeleteLocalRef(bytes); | |
| 70 return result; | |
| 71 } | |
| 72 | |
| 73 int jniGetFDFromFileDescriptor(JNIEnv * env, jobject fileDescriptor) { | |
| 74 jclass Class_java_io_FileDescriptor = env->FindClass("java/io/FileDescriptor"); | |
| 75 jfieldID descriptor = env->GetFieldID(Class_java_io_FileDescriptor, | |
| 76 "descriptor", "I"); | |
| 77 return env->GetIntField(fileDescriptor, descriptor); | |
| 78 } | |
| 79 | |
| 80 static int create_subprocess(const char *cmd, const char *arg0, const char *arg1, int *pProcessId) { | |
| 81 char *devname; | |
| 82 int ptm; | |
| 83 pid_t pid; | |
| 84 | |
| 85 ptm = open("/dev/ptmx", O_RDWR); // | O_NOCTTY); | |
| 86 if (ptm < 0) { | |
| 87 LOG("[ cannot open /dev/ptmx - %s ]\n", strerror(errno)); | |
| 88 return -1; | |
| 89 } | |
| 90 fcntl(ptm, F_SETFD, FD_CLOEXEC); | |
| 91 | |
| 92 if (grantpt(ptm) || unlockpt(ptm) || ((devname = (char *) ptsname(ptm)) == 0)) { | |
| 93 LOG("[ trouble with /dev/ptmx - %s ]\n", strerror(errno)); | |
| 94 return -1; | |
| 95 } | |
| 96 | |
| 97 pid = fork(); | |
| 98 if (pid < 0) { | |
| 99 LOG("- fork failed: %s -\n", strerror(errno)); | |
| 100 return -1; | |
| 101 } | |
| 102 | |
| 103 if (pid == 0) { | |
| 104 int pts; | |
| 105 | |
| 106 setsid(); | |
| 107 | |
| 108 pts = open(devname, O_RDWR); | |
| 109 if (pts < 0) | |
| 110 exit(-1); | |
| 111 | |
| 112 dup2(pts, 0); | |
| 113 dup2(pts, 1); | |
| 114 dup2(pts, 2); | |
| 115 | |
| 116 close(ptm); | |
| 117 | |
| 118 execl(cmd, cmd, arg0, arg1, NULL); | |
| 119 exit(-1); | |
| 120 } else { | |
| 121 *pProcessId = (int) pid; | |
| 122 return ptm; | |
| 123 } | |
| 124 } | |
| 125 | |
| 126 JNIEXPORT jobject JNICALL Java_com_google_ase_Exec_createSubprocess(JNIEnv * env, jclass clazz, | |
| 127 jstring cmd, jstring arg0, | |
| 128 jstring arg1, | |
| 129 jintArray processIdArray) { | |
| 130 char *cmd_8 = JNU_GetStringNativeChars(env, cmd); | |
| 131 char *arg0_8 = JNU_GetStringNativeChars(env, arg0); | |
| 132 char *arg1_8 = JNU_GetStringNativeChars(env, arg1); | |
| 133 | |
| 134 int procId; | |
| 135 int ptm = create_subprocess(cmd_8, arg0_8, arg1_8, &procId); | |
| 136 | |
| 137 if (processIdArray) { | |
| 138 int procIdLen = env->GetArrayLength(processIdArray); | |
| 139 if (procIdLen > 0) { | |
| 140 jboolean isCopy; | |
| 141 int *pProcId = (int *) env->GetPrimitiveArrayCritical(processIdArray, &isCopy); | |
| 142 if (pProcId) { | |
| 143 *pProcId = procId; | |
| 144 env->ReleasePrimitiveArrayCritical(processIdArray, pProcId, 0); | |
| 145 } | |
| 146 } | |
| 147 } | |
| 148 | |
| 149 jclass Class_java_io_FileDescriptor = env->FindClass("java/io/FileDescriptor"); | |
| 150 jmethodID init = env->GetMethodID(Class_java_io_FileDescriptor, | |
| 151 "<init>", "()V"); | |
| 152 jobject result = env->NewObject(Class_java_io_FileDescriptor, init); | |
| 153 | |
| 154 if (!result) { | |
| 155 LOG("Couldn't create a FileDescriptor."); | |
| 156 } else { | |
| 157 jfieldID descriptor = env->GetFieldID(Class_java_io_FileDescriptor, | |
| 158 "descriptor", "I"); | |
| 159 env->SetIntField(result, descriptor, ptm); | |
| 160 } | |
| 161 | |
| 162 return result; | |
| 163 } | |
| 164 | |
| 165 JNIEXPORT void Java_com_google_ase_Exec_setPtyWindowSize(JNIEnv * env, jclass clazz, | |
| 166 jobject fileDescriptor, jint row, jint col, | |
| 167 jint xpixel, jint ypixel) { | |
| 168 int fd; | |
| 169 struct winsize sz; | |
| 170 | |
| 171 fd = jniGetFDFromFileDescriptor(env, fileDescriptor); | |
| 172 | |
| 173 if (env->ExceptionOccurred() != NULL) { | |
| 174 return; | |
| 175 } | |
| 176 | |
| 177 sz.ws_row = row; | |
| 178 sz.ws_col = col; | |
| 179 sz.ws_xpixel = xpixel; | |
| 180 sz.ws_ypixel = ypixel; | |
| 181 | |
| 182 ioctl(fd, TIOCSWINSZ, &sz); | |
| 183 } | |
| 184 | |
| 185 JNIEXPORT jint Java_com_google_ase_Exec_waitFor(JNIEnv * env, jclass clazz, jint procId) { | |
| 186 int status; | |
| 187 waitpid(procId, &status, 0); | |
| 188 int result = 0; | |
| 189 if (WIFEXITED(status)) { | |
| 190 result = WEXITSTATUS(status); | |
| 191 } | |
| 192 return result; | |
| 193 } |