Merge "base: kernel logging get pre-opened /dev/kmsg from environment" (86c931c5) · Commits · e / os / android_system_core

base/logging.cpp

+19 −1

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@
		#endif

		#include <android-base/macros.h>
		#include <android-base/parseint.h>
		#include <android-base/strings.h>
		#include <android-base/threads.h>

		@@ -82,6 +83,23 @@ const char* getprogname() {
		return progname;
		}
		#endif

		#if defined(__linux__)
		int OpenKmsg() {
		#if defined(__ANDROID__)
		// pick up 'file w /dev/kmsg' environment from daemon's init rc file
		const auto val = getenv("ANDROID_FILE__dev_kmsg");
		if (val != nullptr) {
		int fd;
		if (android::base::ParseInt(val, &fd, 0)) {
		auto flags = fcntl(fd, F_GETFL);
		if ((flags != -1) && ((flags & O_ACCMODE) == O_WRONLY)) return fd;
		}
		}
		#endif
		return TEMP_FAILURE_RETRY(open("/dev/kmsg", O_WRONLY \| O_CLOEXEC));
		}
		#endif
		} // namespace

		namespace android {
		@@ -150,7 +168,7 @@ void KernelLogger(android::base::LogId, android::base::LogSeverity severity,
		static_assert(arraysize(kLogSeverityToKernelLogLevel) == android::base::FATAL + 1,
		"Mismatch in size of kLogSeverityToKernelLogLevel and values in LogSeverity");

		static int klog_fd = TEMP_FAILURE_RETRY(open("/dev/kmsg", O_WRONLY \| O_CLOEXEC));
		static int klog_fd = OpenKmsg();
		if (klog_fd == -1) return;

		int level = kLogSeverityToKernelLogLevel[severity];