liblog: add android_lookupEventTagNum am: c9e5f37166 am: cb0565b5fa (a07d536b) · Commits · e / os / android_system_core

liblog/event_tag_map.cpp

+200 −17

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		#include <errno.h>
		#include <fcntl.h>
		#include <inttypes.h>
		#include <limits.h>
		#include <stdio.h>
		#include <stdlib.h>
		#include <string.h>
		@@ -26,15 +27,63 @@

		#include <experimental/string_view>
		#include <functional>
		#include <string>
		#include <unordered_map>

		#include <log/event_tag_map.h>
		#include <utils/FastStrcmp.h>
		#include <utils/RWLock.h>
		#include <private/android_logger.h>

		#include "log_portability.h"
		#include "logd_reader.h"

		#define OUT_TAG "EventTagMap"

		typedef std::experimental::string_view MapString;
		class MapString {
		private:
		const std::string* alloc; // HAS-AN
		const std::experimental::string_view str; // HAS-A

		public:
		operator const std::experimental::string_view() const { return str; }

		const char* data() const { return str.data(); }
		size_t length() const { return str.length(); }

		bool operator== (const MapString& rval) const {
		if (length() != rval.length()) return false;
		if (length() == 0) return true;
		return fastcmp<strncmp>(data(), rval.data(), length()) == 0;
		}
		bool operator!= (const MapString& rval) const {
		return !(*this == rval);
		}

		MapString(const char* str, size_t len) : alloc(NULL), str(str, len) { }
		explicit MapString(const std::string& str) :
		alloc(new std::string(str)),
		str(alloc->data(), alloc->length()) { }
		MapString(MapString &&rval) :
		alloc(rval.alloc),
		str(rval.data(), rval.length()) {
		rval.alloc = NULL;
		}
		explicit MapString(const MapString &rval) :
		alloc(rval.alloc ? new std::string(*rval.alloc) : NULL),
		str(alloc ? alloc->data() : rval.data(), rval.length()) { }

		~MapString() { if (alloc) delete alloc; }
		};

		// Hash for MapString
		template <> struct std::hash<MapString>
		: public std::unary_function<const MapString&, size_t> {
		size_t operator()(const MapString& __t) const noexcept {
		if (!__t.length()) return 0;
		return std::hash<std::experimental::string_view>()(std::experimental::string_view(__t));
		}
		};

		typedef std::pair<MapString, MapString> TagFmt;

		@@ -60,6 +109,10 @@ struct EventTagMap {

		private:
		std::unordered_map<uint32_t, TagFmt> Idx2TagFmt;
		std::unordered_map<TagFmt, uint32_t> TagFmt2Idx;
		std::unordered_map<MapString, uint32_t> Tag2Idx;
		// protect unordered sets
		android::RWLock rwlock;

		public:
		EventTagMap() {
		@@ -69,6 +122,8 @@ public:

		~EventTagMap() {
		Idx2TagFmt.clear();
		TagFmt2Idx.clear();
		Tag2Idx.clear();
		for (size_t which = 0; which < NUM_MAPS; ++which) {
		if (mapAddr[which]) {
		munmap(mapAddr[which], mapLen[which]);
		@@ -79,16 +134,22 @@ public:

		bool emplaceUnique(uint32_t tag, const TagFmt& tagfmt, bool verbose = false);
		const TagFmt* find(uint32_t tag) const;
		int find(TagFmt&& tagfmt) const;
		int find(MapString&& tag) const;
		};

		bool EventTagMap::emplaceUnique(uint32_t tag, const TagFmt& tagfmt, bool verbose) {
		bool ret = true;
		static const char errorFormat[] = OUT_TAG ": duplicate tag entries %" PRIu32
		":%.s:%.s and %" PRIu32
		":%.s:%.s)\n";
		android::RWLock::AutoWLock writeLock(rwlock);
		{
		std::unordered_map<uint32_t, TagFmt>::const_iterator it;
		it = Idx2TagFmt.find(tag);
		if (it != Idx2TagFmt.end()) {
		if (verbose) {
		fprintf(stderr,
		OUT_TAG ": duplicate tag entries %" PRIu32
		":%.s:%.s and %" PRIu32 ":%.s:%.s)\n",
		fprintf(stderr, errorFormat,
		it->first,
		(int)it->second.first.length(), it->second.first.data(),
		(int)it->second.second.length(), it->second.second.data(),
		@@ -96,20 +157,70 @@ bool EventTagMap::emplaceUnique(uint32_t tag, const TagFmt& tagfmt, bool verbose
		(int)tagfmt.first.length(), tagfmt.first.data(),
		(int)tagfmt.second.length(), tagfmt.second.data());
		}
		return false;
		ret = false;
		} else {
		Idx2TagFmt.emplace(std::make_pair(tag, tagfmt));
		}
		}

		Idx2TagFmt.emplace(std::make_pair(tag, tagfmt));
		return true;
		{
		std::unordered_map<TagFmt, uint32_t>::const_iterator it;
		it = TagFmt2Idx.find(tagfmt);
		if (it != TagFmt2Idx.end()) {
		if (verbose) {
		fprintf(stderr, errorFormat,
		it->second,
		(int)it->first.first.length(), it->first.first.data(),
		(int)it->first.second.length(), it->first.second.data(),
		tag,
		(int)tagfmt.first.length(), tagfmt.first.data(),
		(int)tagfmt.second.length(), tagfmt.second.data());
		}
		ret = false;
		} else {
		TagFmt2Idx.emplace(std::make_pair(tagfmt, tag));
		}
		}

		{
		std::unordered_map<MapString, uint32_t>::const_iterator it;
		it = Tag2Idx.find(tagfmt.first);
		if (!tagfmt.second.length() && (it != Tag2Idx.end())) {
		Tag2Idx.erase(it);
		it = Tag2Idx.end();
		}
		if (it == Tag2Idx.end()) {
		Tag2Idx.emplace(std::make_pair(tagfmt.first, tag));
		}
		}

		return ret;
		}

		const TagFmt* EventTagMap::find(uint32_t tag) const {
		std::unordered_map<uint32_t, TagFmt>::const_iterator it;
		android::RWLock::AutoRLock readLock(const_cast<android::RWLock&>(rwlock));
		it = Idx2TagFmt.find(tag);
		if (it == Idx2TagFmt.end()) return NULL;
		return &(it->second);
		}

		int EventTagMap::find(TagFmt&& tagfmt) const {
		std::unordered_map<TagFmt, uint32_t>::const_iterator it;
		android::RWLock::AutoRLock readLock(const_cast<android::RWLock&>(rwlock));
		it = TagFmt2Idx.find(std::move(tagfmt));
		if (it == TagFmt2Idx.end()) return -1;
		return it->second;
		}

		int EventTagMap::find(MapString&& tag) const {
		std::unordered_map<MapString, uint32_t>::const_iterator it;
		android::RWLock::AutoRLock readLock(const_cast<android::RWLock&>(rwlock));
		it = Tag2Idx.find(std::move(tag));
		if (it == Tag2Idx.end()) return -1;
		return it->second;
		}

		// Scan one tag line.
		//
		// "*pData" should be pointing to the first digit in the tag number. On
		@@ -380,3 +491,75 @@ LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
		if (cp) cp = '\0'; // Trigger copy on write :-( and why deprecated.
		return tagStr;
		}

		// Look up tagname, generate one if necessary, and return a tag
		LIBLOG_ABI_PUBLIC int android_lookupEventTagNum(EventTagMap* map,
		const char* tagname,
		const char* format,
		int prio) {
		size_t len = strlen(tagname);
		if (!len) {
		errno = EINVAL;
		return -1;
		}

		if ((prio != ANDROID_LOG_UNKNOWN) && (prio < ANDROID_LOG_SILENT) &&
		!__android_log_is_loggable_len(prio, tagname, len,
		__android_log_is_debuggable() ?
		ANDROID_LOG_VERBOSE :
		ANDROID_LOG_DEBUG)) {
		errno = EPERM;
		return -1;
		}

		if (!format) format="";
		ssize_t fmtLen = strlen(format);
		int ret = map->find(TagFmt(std::make_pair(MapString(tagname, len),
		MapString(format, fmtLen))));
		if (ret != -1) return ret;

		// call event tag service to arrange for a new tag
		char *buf = NULL;
		// Can not use android::base::StringPrintf, asprintf + free instead.
		static const char command_template[] = "getEventTag name=%s format=\"%s\"";
		ret = asprintf(&buf, command_template, tagname, format);
		if (ret > 0) {
		// Add some buffer margin for an estimate of the full return content.
		char *cp;
		size_t size = ret - strlen(command_template) +
		strlen("65535\n4294967295\t?\t\t\t?\t# uid=32767\n\n\f?success?");
		if (size > (size_t)ret) {
		cp = static_cast<char*>(realloc(buf, size));
		if (cp) {
		buf = cp;
		} else {
		size = ret;
		}
		} else {
		size = ret;
		}
		// Ask event log tag service for an allocation
		if (__send_log_msg(buf, size) >= 0) {
		buf[size - 1] = '\0';
		unsigned long val = strtoul(buf, &cp, 10); // return size
		if ((buf != cp) && (val > 0) && (*cp == '\n')) { // truncation OK
		val = strtoul(cp + 1, &cp, 10); // allocated tag number
		if ((val > 0) && (val < UINT32_MAX) && (*cp == '\t')) {
		free(buf);
		ret = val;
		// cache
		map->emplaceUnique(ret, TagFmt(std::make_pair(
		MapString(std::string(tagname, len)),
		MapString(std::string(format, fmtLen)))));
		return ret;
		}
		}
		}
		free(buf);
		}

		// Hail Mary
		ret = map->find(MapString(tagname, len));
		if (ret == -1) errno = ESRCH;
		return ret;
		}

liblog/fake_log_device.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -715,6 +715,12 @@ LIBLOG_HIDDEN ssize_t fakeLogWritev(int fd,
		return redirectWritev(fd, vector, count);
		}

		LIBLOG_HIDDEN ssize_t __send_log_msg(char *buf __unused,
		size_t buf_size __unused)
		{
		return -ENODEV;
		}

		LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio,
		const char *tag __unused,
		int def)

liblog/include/log/event_tag_map.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -58,6 +58,12 @@ const char* android_lookupEventTag_len(const EventTagMap* map,
		const char* android_lookupEventFormat_len(const EventTagMap* map,
		size_t* len, unsigned int tag);

		/*
		* Look up tagname, generate one if necessary, and return a tag
		*/
		int android_lookupEventTagNum(EventTagMap* map, const char* tagname,
		const char* format, int prio);

		#ifdef __cplusplus
		}
		#endif

liblog/logd_reader.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -37,6 +37,7 @@

		#include "config_read.h"
		#include "log_portability.h"
		#include "logd_reader.h"
		#include "logger.h"

		/* branchless on many architectures. */
		@@ -324,6 +325,11 @@ done:
		return ret;
		}

		LIBLOG_HIDDEN ssize_t __send_log_msg(char *buf, size_t buf_size)
		{
		return send_log_msg(NULL, NULL, buf, buf_size);
		}

		static int check_log_success(char *buf, ssize_t ret)
		{
		if (ret < 0) {

liblog/logd_reader.h

0 → 100644

+30 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		*/

		#ifndef _LIBLOG_LOGD_READER_H__
		#define _LIBLOG_LOGD_READER_H__

		#include <unistd.h>

		#include "log_portability.h"

		__BEGIN_DECLS

		LIBLOG_HIDDEN ssize_t __send_log_msg(char *buf, size_t buf_size);

		__END_DECLS

		#endif /* _LIBLOG_LOGD_READER_H__ */