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;
+}
+