Loading include/cutils/files.h 0 → 100644 +37 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 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. */ #ifndef __CUTILS_FILES_H #define __CUTILS_FILES_H #define ANDROID_FILE_ENV_PREFIX "ANDROID_FILE_" #ifdef __cplusplus extern "C" { #endif /* * android_get_control_file - simple helper function to get the file * descriptor of our init-managed file. `path' is the filename path as * given in init.rc. Returns -1 on error. */ int android_get_control_file(const char* path); #ifdef __cplusplus } #endif #endif /* __CUTILS_FILES_H */ libcutils/Android.bp +1 −0 Original line number Diff line number Diff line Loading @@ -34,6 +34,7 @@ cc_library { host_supported: true, srcs: [ "config_utils.c", "files.cpp", "fs_config.c", "canned_fs_config.c", "hashmap.c", Loading libcutils/files.cpp 0 → 100644 +111 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ // This file contains files implementation that can be shared between // platforms as long as the correct headers are included. #define _GNU_SOURCE 1 // for asprintf #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> #include <cutils/files.h> #ifndef TEMP_FAILURE_RETRY // _WIN32 does not define #define TEMP_FAILURE_RETRY(exp) (exp) #endif int android_get_control_file(const char* path) { if (!path) return -1; char *key = NULL; if (asprintf(&key, ANDROID_FILE_ENV_PREFIX "%s", path) < 0) return -1; if (!key) return -1; char *cp = key; while (*cp) { if (!isalnum(*cp)) *cp = '_'; ++cp; } const char* val = getenv(key); free(key); if (!val) return -1; errno = 0; long fd = strtol(val, NULL, 10); if (errno) return -1; // validity checking if ((fd < 0) || (fd > INT_MAX)) return -1; #if defined(_SC_OPEN_MAX) if (fd >= sysconf(_SC_OPEN_MAX)) return -1; #elif defined(OPEN_MAX) if (fd >= OPEN_MAX) return -1; #elif defined(_POSIX_OPEN_MAX) if (fd >= _POSIX_OPEN_MAX) return -1; #endif #if defined(F_GETFD) if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD)) < 0) return -1; #elif defined(F_GETFL) if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFL)) < 0) return -1; #else struct stat s; if (TEMP_FAILURE_RETRY(fstat(fd, &s)) < 0) return -1; #endif #if defined(__linux__) char *proc = NULL; if (asprintf(&proc, "/proc/self/fd/%ld", fd) < 0) return -1; if (!proc) return -1; size_t len = strlen(path); char *buf = static_cast<char *>(calloc(1, len + 2)); if (!buf) { free(proc); return -1; } ssize_t ret = TEMP_FAILURE_RETRY(readlink(proc, buf, len + 1)); free(proc); int cmp = (len != static_cast<size_t>(ret)) || strcmp(buf, path); free(buf); if (ret < 0) return -1; if (cmp != 0) return -1; #endif // It is what we think it is return static_cast<int>(fd); } libcutils/tests/Android.bp +1 −1 Original line number Diff line number Diff line Loading @@ -14,7 +14,7 @@ cc_defaults { name: "libcutils_test_default", srcs: ["sockets_test.cpp"], srcs: ["sockets_test.cpp", "files_test.cpp"], target: { android: { Loading libcutils/tests/files_test.cpp 0 → 100644 +46 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 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. */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <time.h> #include <cutils/files.h> #include <gtest/gtest.h> TEST(FilesTest, android_get_control_file) { static const char key[] = ANDROID_FILE_ENV_PREFIX "_dev_kmsg"; static const char name[] = "/dev/kmsg"; EXPECT_EQ(unsetenv(key), 0); EXPECT_EQ(android_get_control_file(name), -1); int fd; ASSERT_GE(fd = open(name, O_RDONLY | O_CLOEXEC), 0); EXPECT_EQ(android_get_control_file(name), -1); char val[32]; snprintf(val, sizeof(val), "%d", fd); EXPECT_EQ(setenv(key, val, true), 0); EXPECT_EQ(android_get_control_file(name), fd); close(fd); EXPECT_EQ(android_get_control_file(name), -1); EXPECT_EQ(unsetenv(key), 0); EXPECT_EQ(android_get_control_file(name), -1); } Loading
include/cutils/files.h 0 → 100644 +37 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 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. */ #ifndef __CUTILS_FILES_H #define __CUTILS_FILES_H #define ANDROID_FILE_ENV_PREFIX "ANDROID_FILE_" #ifdef __cplusplus extern "C" { #endif /* * android_get_control_file - simple helper function to get the file * descriptor of our init-managed file. `path' is the filename path as * given in init.rc. Returns -1 on error. */ int android_get_control_file(const char* path); #ifdef __cplusplus } #endif #endif /* __CUTILS_FILES_H */
libcutils/Android.bp +1 −0 Original line number Diff line number Diff line Loading @@ -34,6 +34,7 @@ cc_library { host_supported: true, srcs: [ "config_utils.c", "files.cpp", "fs_config.c", "canned_fs_config.c", "hashmap.c", Loading
libcutils/files.cpp 0 → 100644 +111 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ // This file contains files implementation that can be shared between // platforms as long as the correct headers are included. #define _GNU_SOURCE 1 // for asprintf #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> #include <cutils/files.h> #ifndef TEMP_FAILURE_RETRY // _WIN32 does not define #define TEMP_FAILURE_RETRY(exp) (exp) #endif int android_get_control_file(const char* path) { if (!path) return -1; char *key = NULL; if (asprintf(&key, ANDROID_FILE_ENV_PREFIX "%s", path) < 0) return -1; if (!key) return -1; char *cp = key; while (*cp) { if (!isalnum(*cp)) *cp = '_'; ++cp; } const char* val = getenv(key); free(key); if (!val) return -1; errno = 0; long fd = strtol(val, NULL, 10); if (errno) return -1; // validity checking if ((fd < 0) || (fd > INT_MAX)) return -1; #if defined(_SC_OPEN_MAX) if (fd >= sysconf(_SC_OPEN_MAX)) return -1; #elif defined(OPEN_MAX) if (fd >= OPEN_MAX) return -1; #elif defined(_POSIX_OPEN_MAX) if (fd >= _POSIX_OPEN_MAX) return -1; #endif #if defined(F_GETFD) if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD)) < 0) return -1; #elif defined(F_GETFL) if (TEMP_FAILURE_RETRY(fcntl(fd, F_GETFL)) < 0) return -1; #else struct stat s; if (TEMP_FAILURE_RETRY(fstat(fd, &s)) < 0) return -1; #endif #if defined(__linux__) char *proc = NULL; if (asprintf(&proc, "/proc/self/fd/%ld", fd) < 0) return -1; if (!proc) return -1; size_t len = strlen(path); char *buf = static_cast<char *>(calloc(1, len + 2)); if (!buf) { free(proc); return -1; } ssize_t ret = TEMP_FAILURE_RETRY(readlink(proc, buf, len + 1)); free(proc); int cmp = (len != static_cast<size_t>(ret)) || strcmp(buf, path); free(buf); if (ret < 0) return -1; if (cmp != 0) return -1; #endif // It is what we think it is return static_cast<int>(fd); }
libcutils/tests/Android.bp +1 −1 Original line number Diff line number Diff line Loading @@ -14,7 +14,7 @@ cc_defaults { name: "libcutils_test_default", srcs: ["sockets_test.cpp"], srcs: ["sockets_test.cpp", "files_test.cpp"], target: { android: { Loading
libcutils/tests/files_test.cpp 0 → 100644 +46 −0 Original line number Diff line number Diff line /* * Copyright (C) 2016 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. */ #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <time.h> #include <cutils/files.h> #include <gtest/gtest.h> TEST(FilesTest, android_get_control_file) { static const char key[] = ANDROID_FILE_ENV_PREFIX "_dev_kmsg"; static const char name[] = "/dev/kmsg"; EXPECT_EQ(unsetenv(key), 0); EXPECT_EQ(android_get_control_file(name), -1); int fd; ASSERT_GE(fd = open(name, O_RDONLY | O_CLOEXEC), 0); EXPECT_EQ(android_get_control_file(name), -1); char val[32]; snprintf(val, sizeof(val), "%d", fd); EXPECT_EQ(setenv(key, val, true), 0); EXPECT_EQ(android_get_control_file(name), fd); close(fd); EXPECT_EQ(android_get_control_file(name), -1); EXPECT_EQ(unsetenv(key), 0); EXPECT_EQ(android_get_control_file(name), -1); }
