recovery: use __android_log_pmsg_file_write for log files
- Add call to __android_log_pmsg_file_write for recovery logging.
- Add call to refresh pmsg if we reboot back into recovery and then
allow overwrite of those logs.
- Add a new one-time executable recovery-refresh that refreshes pmsg
in post-fs phase of init. We rely on pmsg eventually scrolling off
to age the content after recovery-persist has done its job.
- Add a new one-time executable recovery-persist that transfers from
pmsg to /data/misc/recovery/ directory if /cache is not mounted
in post-fs-data phase of init.
- Build and appropriately trigger the above two as required if
BOARD_CACHEIMAGE_PARTITION_SIZE is undefined.
- Add some simple unit tests
NB: Test failure is expected on systems that do not deliver either
the recovery-persist or recovery-refresh executables, e.g. systems
with /cache. Tests also require a timely reboot sequence of test
to truly verify, tests provide guidance on stderr to direct.
Bug: 27176738
Change-Id: I17bb95980234984f6b2087fd5941b0a3126b706b
diff --git a/Android.mk b/Android.mk
index fc981e1..12a37ba 100644
--- a/Android.mk
+++ b/Android.mk
@@ -102,6 +102,30 @@
LOCAL_STATIC_LIBRARIES += $(TARGET_RECOVERY_UI_LIB)
endif
+ifeq ($(BOARD_CACHEIMAGE_PARTITION_SIZE),)
+LOCAL_REQUIRED_MODULES := recovery-persist recovery-refresh
+endif
+
+include $(BUILD_EXECUTABLE)
+
+# recovery-persist (system partition dynamic executable run after /data mounts)
+# ===============================
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := recovery-persist.cpp
+LOCAL_MODULE := recovery-persist
+LOCAL_SHARED_LIBRARIES := liblog libbase
+LOCAL_CFLAGS := -Werror
+LOCAL_INIT_RC := recovery-persist.rc
+include $(BUILD_EXECUTABLE)
+
+# recovery-refresh (system partition dynamic executable run at init)
+# ===============================
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := recovery-refresh.cpp
+LOCAL_MODULE := recovery-refresh
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_CFLAGS := -Werror
+LOCAL_INIT_RC := recovery-refresh.rc
include $(BUILD_EXECUTABLE)
# libverifier (static library)
diff --git a/recovery-persist.cpp b/recovery-persist.cpp
new file mode 100644
index 0000000..8587e9a
--- /dev/null
+++ b/recovery-persist.cpp
@@ -0,0 +1,200 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "recovery-persist"
+
+//
+// Strictly to deal with reboot into system after OTA after /data
+// mounts to pull the last pmsg file data and place it
+// into /data/misc/recovery/ directory, rotating it in.
+//
+// Usage: recovery-persist [--force-persist]
+//
+// On systems without /cache mount, all file content representing in the
+// recovery/ directory stored in /sys/fs/pstore/pmsg-ramoops-0 in logger
+// format that reside in the LOG_ID_SYSTEM buffer at ANDROID_LOG_INFO
+// priority or higher is transfered to the /data/misc/recovery/ directory.
+// The content is matched and rotated in as need be.
+//
+// --force-persist ignore /cache mount, always rotate in the contents.
+//
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <string>
+
+#include <android/log.h> /* Android Log Priority Tags */
+#include <android-base/file.h>
+#include <log/log.h>
+#include <log/logger.h> /* Android Log packet format */
+#include <private/android_logger.h> /* private pmsg functions */
+
+static const char *LAST_LOG_FILE = "/data/misc/recovery/last_log";
+static const char *LAST_PMSG_FILE = "/sys/fs/pstore/pmsg-ramoops-0";
+static const char *LAST_KMSG_FILE = "/data/misc/recovery/last_kmsg";
+static const char *LAST_CONSOLE_FILE = "/sys/fs/pstore/console-ramoops-0";
+
+static const int KEEP_LOG_COUNT = 10;
+
+// close a file, log an error if the error indicator is set
+static void check_and_fclose(FILE *fp, const char *name) {
+ fflush(fp);
+ if (ferror(fp)) SLOGE("%s %s", name, strerror(errno));
+ fclose(fp);
+}
+
+static void copy_file(const char* source, const char* destination) {
+ FILE* dest_fp = fopen(destination, "w");
+ if (dest_fp == nullptr) {
+ SLOGE("%s %s", destination, strerror(errno));
+ } else {
+ FILE* source_fp = fopen(source, "r");
+ if (source_fp != nullptr) {
+ char buf[4096];
+ size_t bytes;
+ while ((bytes = fread(buf, 1, sizeof(buf), source_fp)) != 0) {
+ fwrite(buf, 1, bytes, dest_fp);
+ }
+ check_and_fclose(source_fp, source);
+ }
+ check_and_fclose(dest_fp, destination);
+ }
+}
+
+static bool rotated = false;
+
+// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
+// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
+// Overwrite any existing last_log.$max and last_kmsg.$max.
+static void rotate_logs(int max) {
+ // Logs should only be rotated once.
+
+ if (rotated) {
+ return;
+ }
+ rotated = true;
+
+ for (int i = max-1; i >= 0; --i) {
+ std::string old_log(LAST_LOG_FILE);
+ if (i > 0) {
+ old_log += "." + std::to_string(i);
+ }
+ std::string new_log(LAST_LOG_FILE);
+ new_log += "." + std::to_string(i+1);
+
+ // Ignore errors if old_log doesn't exist.
+ rename(old_log.c_str(), new_log.c_str());
+
+ std::string old_kmsg(LAST_KMSG_FILE);
+ if (i > 0) {
+ old_kmsg += "." + std::to_string(i);
+ }
+ std::string new_kmsg(LAST_KMSG_FILE);
+ new_kmsg += "." + std::to_string(i+1);
+
+ rename(old_kmsg.c_str(), new_kmsg.c_str());
+ }
+}
+
+ssize_t logsave(
+ log_id_t /* logId */,
+ char /* prio */,
+ const char *filename,
+ const char *buf, size_t len,
+ void * /* arg */) {
+
+ std::string destination("/data/misc/");
+ destination += filename;
+
+ std::string buffer(buf, len);
+
+ {
+ std::string content;
+ android::base::ReadFileToString(destination, &content);
+
+ if (buffer.compare(content) == 0) {
+ return len;
+ }
+ }
+
+ // ToDo: Any others that match? Are we pulling in multiple
+ // already-rotated files? Algorithm thus far is KISS: one file,
+ // one rotation allowed.
+
+ rotate_logs(KEEP_LOG_COUNT);
+
+ return android::base::WriteStringToFile(buffer, destination.c_str());
+}
+
+int main(int argc, char **argv) {
+
+ /* Is /cache a mount?, we have been delivered where we are not wanted */
+ /*
+ * Following code halves the size of the executable as compared to:
+ *
+ * load_volume_table();
+ * has_cache = volume_for_path(CACHE_ROOT) != nullptr;
+ */
+ bool has_cache = false;
+ static const char mounts_file[] = "/proc/mounts";
+ FILE *fp = fopen(mounts_file, "r");
+ if (!fp) {
+ SLOGV("%s %s", mounts_file, strerror(errno));
+ } else {
+ char *line = NULL;
+ size_t len = 0;
+ ssize_t read;
+ while ((read = getline(&line, &len, fp)) != -1) {
+ if (strstr(line, " /cache ")) {
+ has_cache = true;
+ break;
+ }
+ }
+ free(line);
+ fclose(fp);
+ }
+
+ if (has_cache) {
+ /*
+ * TBD: Future location to move content from
+ * /cache/recovery to /data/misc/recovery/
+ */
+ /* if --force-persist flag, then transfer pmsg data anyways */
+ if ((argc <= 1) || !argv[1] || strcmp(argv[1], "--force-persist")) {
+ return 0;
+ }
+ }
+
+ /* Is there something in pmsg? */
+ if (access(LAST_PMSG_FILE, R_OK)) {
+ return 0;
+ }
+
+ // Take last pmsg file contents and send it off to the logsave
+ __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, "recovery/", logsave, NULL);
+
+ /* Is there a last console log too? */
+ if (rotated && !access(LAST_CONSOLE_FILE, R_OK)) {
+ copy_file(LAST_CONSOLE_FILE, LAST_KMSG_FILE);
+ }
+
+ return 0;
+}
diff --git a/recovery-persist.rc b/recovery-persist.rc
new file mode 100644
index 0000000..6761627
--- /dev/null
+++ b/recovery-persist.rc
@@ -0,0 +1,3 @@
+on post-fs-data
+ mkdir /data/misc/recovery 0770 system log
+ exec - system log -- /system/bin/recovery-persist
diff --git a/recovery-refresh.cpp b/recovery-refresh.cpp
new file mode 100644
index 0000000..70adc70
--- /dev/null
+++ b/recovery-refresh.cpp
@@ -0,0 +1,128 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "recovery-refresh"
+
+//
+// Strictly to deal with reboot into system after OTA, then
+// reboot while in system before boot complete landing us back
+// into recovery to continue with any mitigations with retained
+// log history. This simply refreshes the pmsg files from
+// the last pmsg file contents.
+//
+// Usage:
+// recovery-refresh [--force-rotate|--rotate]
+//
+// All file content representing in the recovery/ directory stored in
+// /sys/fs/pstore/pmsg-ramoops-0 in logger format that reside in the
+// LOG_ID_SYSTEM buffer at ANDROID_LOG_INFO priority or higher is
+// refreshed into /dev/pmsg0. This ensures that an unexpected reboot
+// before recovery-persist is run will still contain the associated
+// pmsg Android Logger content.
+//
+// --force-rotate recovery/last_kmsg and recovery.last_log files are
+// rotated with .<number> suffixes upwards.
+// --rotate rotated only if rocovery/last_msg or recovery/last_log
+// exist, otherwise perform 1:1 refresh.
+//
+
+#include <string.h>
+
+#include <string>
+
+#include <android/log.h> /* Android Log Priority Tags */
+#include <log/logger.h> /* Android Log packet format */
+#include <private/android_logger.h> /* private pmsg functions */
+
+static const char LAST_KMSG_FILE[] = "recovery/last_kmsg";
+static const char LAST_LOG_FILE[] = "recovery/last_log";
+
+static ssize_t logbasename(
+ log_id_t /* logId */,
+ char /* prio */,
+ const char *filename,
+ const char * /* buf */, size_t len,
+ void *arg) {
+ if (strstr(LAST_KMSG_FILE, filename) ||
+ strstr(LAST_LOG_FILE, filename)) {
+ bool *doRotate = reinterpret_cast<bool *>(arg);
+ *doRotate = true;
+ }
+ return len;
+}
+
+static ssize_t logrotate(
+ log_id_t logId,
+ char prio,
+ const char *filename,
+ const char *buf, size_t len,
+ void *arg) {
+ bool *doRotate = reinterpret_cast<bool *>(arg);
+ if (!*doRotate) {
+ return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
+ }
+
+ std::string name(filename);
+ size_t dot = name.find_last_of(".");
+ std::string sub = name.substr(0, dot);
+
+ if (!strstr(LAST_KMSG_FILE, sub.c_str()) &&
+ !strstr(LAST_LOG_FILE, sub.c_str())) {
+ return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
+ }
+
+ // filename rotation
+ if (dot == std::string::npos) {
+ name += ".1";
+ } else {
+ std::string number = name.substr(dot + 1);
+ if (!isdigit(number.data()[0])) {
+ name += ".1";
+ } else {
+ unsigned long long i = std::stoull(number);
+ name = sub + "." + std::to_string(i + 1);
+ }
+ }
+
+ return __android_log_pmsg_file_write(logId, prio, name.c_str(), buf, len);
+}
+
+int main(int argc, char **argv) {
+ static const char filter[] = "recovery/";
+ static const char force_rotate_flag[] = "--force-rotate";
+ static const char rotate_flag[] = "--rotate";
+ ssize_t ret;
+ bool doRotate = false;
+
+ // Take last pmsg contents and rewrite it to the current pmsg session.
+ if ((argc <= 1) || !argv[1] ||
+ (((doRotate = strcmp(argv[1], rotate_flag))) &&
+ strcmp(argv[1], force_rotate_flag))) {
+ doRotate = false;
+ } else if (!doRotate) {
+ // Do we need to rotate?
+ __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
+ logbasename, &doRotate);
+ }
+
+ // Take action to refresh pmsg contents
+ ret = __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
+ logrotate, &doRotate);
+
+ return (ret < 0) ? ret : 0;
+}
diff --git a/recovery-refresh.rc b/recovery-refresh.rc
new file mode 100644
index 0000000..14b05cc
--- /dev/null
+++ b/recovery-refresh.rc
@@ -0,0 +1,2 @@
+on post-fs
+ exec - system log -- /system/bin/recovery-refresh
diff --git a/recovery.cpp b/recovery.cpp
index 4ee835c..b5514a1 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -35,11 +35,14 @@
#include <chrono>
#include <adb.h>
+#include <android/log.h> /* Android Log Priority Tags */
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
#include <cutils/android_reboot.h>
#include <cutils/properties.h>
+#include <log/logger.h> /* Android Log packet format */
+#include <private/android_logger.h> /* private pmsg functions */
#include <healthd/BatteryMonitor.h>
@@ -374,6 +377,18 @@
android::base::WriteStringToFile(buffer, destination);
}
+// write content to the current pmsg session.
+static ssize_t __pmsg_write(const char *filename, const char *buf, size_t len) {
+ return __android_log_pmsg_file_write(LOG_ID_SYSTEM, ANDROID_LOG_INFO,
+ filename, buf, len);
+}
+
+static void copy_log_file_to_pmsg(const char* source, const char* destination) {
+ std::string content;
+ android::base::ReadFileToString(source, &content);
+ __pmsg_write(destination, content.c_str(), content.length());
+}
+
// How much of the temp log we have copied to the copy in cache.
static long tmplog_offset = 0;
@@ -433,11 +448,6 @@
}
static void copy_logs() {
- // We can do nothing for now if there's no /cache partition.
- if (!has_cache) {
- return;
- }
-
// We only rotate and record the log of the current session if there are
// actual attempts to modify the flash, such as wipes, installs from BCB
// or menu selections. This is to avoid unnecessary rotation (and
@@ -446,6 +456,15 @@
return;
}
+ // Always write to pmsg, this allows the OTA logs to be caught in logcat -L
+ copy_log_file_to_pmsg(TEMPORARY_LOG_FILE, LAST_LOG_FILE);
+ copy_log_file_to_pmsg(TEMPORARY_INSTALL_FILE, LAST_INSTALL_FILE);
+
+ // We can do nothing for now if there's no /cache partition.
+ if (!has_cache) {
+ return;
+ }
+
rotate_logs(KEEP_LOG_COUNT);
// Copy logs to cache so the system can find out what happened.
@@ -470,13 +489,17 @@
// Save the locale to cache, so if recovery is next started up
// without a --locale argument (eg, directly from the bootloader)
// it will use the last-known locale.
- if (locale != NULL && has_cache) {
- LOGI("Saving locale \"%s\"\n", locale);
- FILE* fp = fopen_path(LOCALE_FILE, "w");
- fwrite(locale, 1, strlen(locale), fp);
- fflush(fp);
- fsync(fileno(fp));
- check_and_fclose(fp, LOCALE_FILE);
+ if (locale != NULL) {
+ size_t len = strlen(locale);
+ __pmsg_write(LOCALE_FILE, locale, len);
+ if (has_cache) {
+ LOGI("Saving locale \"%s\"\n", locale);
+ FILE* fp = fopen_path(LOCALE_FILE, "w");
+ fwrite(locale, 1, len, fp);
+ fflush(fp);
+ fsync(fileno(fp));
+ check_and_fclose(fp, LOCALE_FILE);
+ }
}
copy_logs();
@@ -1147,7 +1170,69 @@
set_bootloader_message(&boot);
}
+static ssize_t logbasename(
+ log_id_t /* logId */,
+ char /* prio */,
+ const char *filename,
+ const char * /* buf */, size_t len,
+ void *arg) {
+ if (strstr(LAST_KMSG_FILE, filename) ||
+ strstr(LAST_LOG_FILE, filename)) {
+ bool *doRotate = reinterpret_cast<bool *>(arg);
+ *doRotate = true;
+ }
+ return len;
+}
+
+static ssize_t logrotate(
+ log_id_t logId,
+ char prio,
+ const char *filename,
+ const char *buf, size_t len,
+ void *arg) {
+ bool *doRotate = reinterpret_cast<bool *>(arg);
+ if (!*doRotate) {
+ return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
+ }
+
+ std::string name(filename);
+ size_t dot = name.find_last_of(".");
+ std::string sub = name.substr(0, dot);
+
+ if (!strstr(LAST_KMSG_FILE, sub.c_str()) &&
+ !strstr(LAST_LOG_FILE, sub.c_str())) {
+ return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
+ }
+
+ // filename rotation
+ if (dot == std::string::npos) {
+ name += ".1";
+ } else {
+ std::string number = name.substr(dot + 1);
+ if (!isdigit(number.data()[0])) {
+ name += ".1";
+ } else {
+ unsigned long long i = std::stoull(number);
+ name = sub + "." + std::to_string(i + 1);
+ }
+ }
+
+ return __android_log_pmsg_file_write(logId, prio, name.c_str(), buf, len);
+}
+
int main(int argc, char **argv) {
+ // Take last pmsg contents and rewrite it to the current pmsg session.
+ static const char filter[] = "recovery/";
+ // Do we need to rotate?
+ bool doRotate = false;
+ __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
+ logbasename, &doRotate);
+ // Take action to refresh pmsg contents
+ __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
+ logrotate, &doRotate);
+
// If this binary is started with the single argument "--adbd",
// instead of being the normal recovery binary, it turns into kind
// of a stripped-down version of adbd that only supports the
diff --git a/tests/Android.mk b/tests/Android.mk
index 262fb8b..8f55fc0 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -23,7 +23,9 @@
LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
LOCAL_STATIC_LIBRARIES := libverifier
LOCAL_SRC_FILES := unit/asn1_decoder_test.cpp
+LOCAL_SRC_FILES += unit/recovery_test.cpp
LOCAL_C_INCLUDES := bootable/recovery
+LOCAL_SHARED_LIBRARIES := liblog
include $(BUILD_NATIVE_TEST)
# Component tests
diff --git a/tests/unit/recovery_test.cpp b/tests/unit/recovery_test.cpp
new file mode 100644
index 0000000..f397f25
--- /dev/null
+++ b/tests/unit/recovery_test.cpp
@@ -0,0 +1,92 @@
+/*
+ * 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 <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <android/log.h>
+#include <gtest/gtest.h>
+#include <log/logger.h>
+#include <private/android_logger.h>
+
+static const char myFilename[] = "/data/misc/recovery/inject.txt";
+static const char myContent[] = "Hello World\nWelcome to my recovery\n";
+
+// Failure is expected on systems that do not deliver either the
+// recovery-persist or recovery-refresh executables. Tests also require
+// a reboot sequence of test to truly verify.
+
+static ssize_t __pmsg_fn(log_id_t logId, char prio, const char *filename,
+ const char *buf, size_t len, void *arg) {
+ EXPECT_EQ(LOG_ID_SYSTEM, logId);
+ EXPECT_EQ(ANDROID_LOG_INFO, prio);
+ EXPECT_EQ(0, NULL == strstr(myFilename,filename));
+ EXPECT_EQ(0, strcmp(myContent, buf));
+ EXPECT_EQ(sizeof(myContent), len);
+ EXPECT_EQ(0, NULL != arg);
+ return len;
+}
+
+// recovery.refresh - May fail. Requires recovery.inject, two reboots,
+// then expect success after second reboot.
+TEST(recovery, refresh) {
+ EXPECT_EQ(0, access("/system/bin/recovery-refresh", F_OK));
+
+ ssize_t ret = __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, "recovery/", __pmsg_fn, NULL);
+ if (ret == -ENOENT) {
+ EXPECT_LT(0, __android_log_pmsg_file_write(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO,
+ myFilename, myContent, sizeof(myContent)));
+ fprintf(stderr, "injected test data, "
+ "requires two intervening reboots "
+ "to check for replication\n");
+ }
+ EXPECT_EQ((ssize_t)sizeof(myContent), ret);
+}
+
+// recovery.persist - Requires recovery.inject, then a reboot, then
+// expect success after for this test on that boot.
+TEST(recovery, persist) {
+ EXPECT_EQ(0, access("/system/bin/recovery-persist", F_OK));
+
+ ssize_t ret = __android_log_pmsg_file_read(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO, "recovery/", __pmsg_fn, NULL);
+ if (ret == -ENOENT) {
+ EXPECT_LT(0, __android_log_pmsg_file_write(
+ LOG_ID_SYSTEM, ANDROID_LOG_INFO,
+ myFilename, myContent, sizeof(myContent)));
+ fprintf(stderr, "injected test data, "
+ "requires intervening reboot "
+ "to check for storage\n");
+ }
+
+ int fd = open(myFilename, O_RDONLY);
+ EXPECT_LE(0, fd);
+
+ char buf[sizeof(myContent) + 32];
+ ret = read(fd, buf, sizeof(buf));
+ close(fd);
+ EXPECT_EQ(ret, (ssize_t)sizeof(myContent));
+ EXPECT_EQ(0, strcmp(myContent, buf));
+ if (fd >= 0) {
+ fprintf(stderr, "Removing persistent test data, "
+ "check if reconstructed on reboot\n");
+ }
+ EXPECT_EQ(0, unlink(myFilename));
+}
