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Diffstat (limited to '')
| -rw-r--r-- | otafault/ota_io.cpp | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/otafault/ota_io.cpp b/otafault/ota_io.cpp new file mode 100644 index 000000000..04458537b --- /dev/null +++ b/otafault/ota_io.cpp @@ -0,0 +1,176 @@ +/* + * Copyright (C) 2015 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 <map> + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <sys/stat.h> +#include <unistd.h> + +#include "config.h" +#include "ota_io.h" + +static std::map<intptr_t, const char*> filename_cache; +static std::string read_fault_file_name = ""; +static std::string write_fault_file_name = ""; +static std::string fsync_fault_file_name = ""; + +static bool get_hit_file(const char* cached_path, std::string ffn) { + return should_hit_cache() + ? !strncmp(cached_path, OTAIO_CACHE_FNAME, strlen(cached_path)) + : !strncmp(cached_path, ffn.c_str(), strlen(cached_path)); +} + +void ota_set_fault_files() { + if (should_fault_inject(OTAIO_READ)) { + read_fault_file_name = fault_fname(OTAIO_READ); + } + if (should_fault_inject(OTAIO_WRITE)) { + write_fault_file_name = fault_fname(OTAIO_WRITE); + } + if (should_fault_inject(OTAIO_FSYNC)) { + fsync_fault_file_name = fault_fname(OTAIO_FSYNC); + } +} + +bool have_eio_error = false; + +int ota_open(const char* path, int oflags) { + // Let the caller handle errors; we do not care if open succeeds or fails + int fd = open(path, oflags); + filename_cache[fd] = path; + return fd; +} + +int ota_open(const char* path, int oflags, mode_t mode) { + int fd = open(path, oflags, mode); + filename_cache[fd] = path; + return fd; } + +FILE* ota_fopen(const char* path, const char* mode) { + FILE* fh = fopen(path, mode); + filename_cache[(intptr_t)fh] = path; + return fh; +} + +int ota_close(int fd) { + // descriptors can be reused, so make sure not to leave them in the cache + filename_cache.erase(fd); + return close(fd); +} + +int ota_fclose(FILE* fh) { + filename_cache.erase((intptr_t)fh); + return fclose(fh); +} + +size_t ota_fread(void* ptr, size_t size, size_t nitems, FILE* stream) { + if (should_fault_inject(OTAIO_READ)) { + auto cached = filename_cache.find((intptr_t)stream); + const char* cached_path = cached->second; + if (cached != filename_cache.end() && + get_hit_file(cached_path, read_fault_file_name)) { + read_fault_file_name = ""; + errno = EIO; + have_eio_error = true; + return 0; + } + } + size_t status = fread(ptr, size, nitems, stream); + if (status != nitems && errno == EIO) { + have_eio_error = true; + } + return status; +} + +ssize_t ota_read(int fd, void* buf, size_t nbyte) { + if (should_fault_inject(OTAIO_READ)) { + auto cached = filename_cache.find(fd); + const char* cached_path = cached->second; + if (cached != filename_cache.end() + && get_hit_file(cached_path, read_fault_file_name)) { + read_fault_file_name = ""; + errno = EIO; + have_eio_error = true; + return -1; + } + } + ssize_t status = read(fd, buf, nbyte); + if (status == -1 && errno == EIO) { + have_eio_error = true; + } + return status; +} + +size_t ota_fwrite(const void* ptr, size_t size, size_t count, FILE* stream) { + if (should_fault_inject(OTAIO_WRITE)) { + auto cached = filename_cache.find((intptr_t)stream); + const char* cached_path = cached->second; + if (cached != filename_cache.end() && + get_hit_file(cached_path, write_fault_file_name)) { + write_fault_file_name = ""; + errno = EIO; + have_eio_error = true; + return 0; + } + } + size_t status = fwrite(ptr, size, count, stream); + if (status != count && errno == EIO) { + have_eio_error = true; + } + return status; +} + +ssize_t ota_write(int fd, const void* buf, size_t nbyte) { + if (should_fault_inject(OTAIO_WRITE)) { + auto cached = filename_cache.find(fd); + const char* cached_path = cached->second; + if (cached != filename_cache.end() && + get_hit_file(cached_path, write_fault_file_name)) { + write_fault_file_name = ""; + errno = EIO; + have_eio_error = true; + return -1; + } + } + ssize_t status = write(fd, buf, nbyte); + if (status == -1 && errno == EIO) { + have_eio_error = true; + } + return status; +} + +int ota_fsync(int fd) { + if (should_fault_inject(OTAIO_FSYNC)) { + auto cached = filename_cache.find(fd); + const char* cached_path = cached->second; + if (cached != filename_cache.end() && + get_hit_file(cached_path, fsync_fault_file_name)) { + fsync_fault_file_name = ""; + errno = EIO; + have_eio_error = true; + return -1; + } + } + int status = fsync(fd); + if (status == -1 && errno == EIO) { + have_eio_error = true; + } + return status; +} + |