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@ -35,6 +35,7 @@
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <cutils/properties.h>
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@ -152,10 +153,29 @@ static bool readFileToString(const std::string& filename, std::string* result) {
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}
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static bool writeStringToFile(const std::string& payload, const std::string& filename) {
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if (!android::base::WriteStringToFile(payload, filename)) {
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android::base::unique_fd fd(TEMP_FAILURE_RETRY(
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open(filename.c_str(), O_WRONLY | O_CREAT | O_NOFOLLOW | O_TRUNC | O_CLOEXEC, 0666)));
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if (fd == -1) {
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PLOG(ERROR) << "Failed to open " << filename;
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return false;
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}
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if (!android::base::WriteStringToFd(payload, fd)) {
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PLOG(ERROR) << "Failed to write to " << filename;
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unlink(filename.c_str());
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return false;
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}
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// fsync as close won't guarantee flush data
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// see close(2), fsync(2) and b/68901441
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if (fsync(fd) == -1) {
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if (errno == EROFS || errno == EINVAL) {
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PLOG(WARNING) << "Skip fsync " << filename
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<< " on a file system does not support synchronization";
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} else {
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PLOG(ERROR) << "Failed to fsync " << filename;
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unlink(filename.c_str());
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return false;
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}
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}
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return true;
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}
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