summaryrefslogtreecommitdiffstats
path: root/otafault/ota_io.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--otafault/ota_io.cpp176
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;
+}
+