Merge "liblog: logd: Add android_lookupEventTag_len()" (aed39f1f) · Commits · e / os / android_system_core

include/android/log.h

+5 −2

Original line number	Diff line number	Diff line
		@@ -803,10 +803,12 @@ int android_log_destroy(android_log_context *ctx);
		*/
		#if LOG_NDEBUG /* Production */
		#define android_testLog(prio, tag) \
		(__android_log_is_loggable(prio, tag, ANDROID_LOG_DEBUG) != 0)
		(__android_log_is_loggable_len(prio, tag, (tag && *tag) ? strlen(tag) : 0, \
		ANDROID_LOG_DEBUG) != 0)
		#else
		#define android_testLog(prio, tag) \
		(__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE) != 0)
		(__android_log_is_loggable_len(prio, tag, (tag && *tag) ? strlen(tag) : 0, \
		ANDROID_LOG_VERBOSE) != 0)
		#endif

		/*
		@@ -816,6 +818,7 @@ int android_log_destroy(android_log_context *ctx);
		* any other value.
		*/
		int __android_log_is_loggable(int prio, const char *tag, int default_prio);
		int __android_log_is_loggable_len(int prio, const char *tag, size_t len, int default_prio);

		int __android_log_security(); /* Device Owner is present */

include/log/event_tag_map.h

+8 −1

Original line number	Diff line number	Diff line
		@@ -41,7 +41,14 @@ void android_closeEventTagMap(EventTagMap* map);
		/*
		* Look up a tag by index. Returns the tag string, or NULL if not found.
		*/
		const char* android_lookupEventTag(const EventTagMap* map, unsigned int tag);
		const char* android_lookupEventTag(const EventTagMap* map, unsigned int tag)
		__attribute__((deprecated("use android_lookupEventTag_len() instead to minimize MAP_PRIVATE copy-on-write memory impact")));

		/*
		* Look up a tag by index. Returns the tag string & string length, or NULL if
		* not found. Returned string is not guaranteed to be nul terminated.
		*/
		const char* android_lookupEventTag_len(const EventTagMap* map, size_t* len, unsigned int tag);

		#ifdef __cplusplus
		}

include/log/logprint.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -59,6 +59,7 @@ typedef struct AndroidLogEntry_t {
		int32_t pid;
		int32_t tid;
		const char * tag;
		size_t tagLen;
		size_t messageLen;
		const char * message;
		} AndroidLogEntry;

liblog/event_tag_map.c

+36 −16

Original line number	Diff line number	Diff line
		@@ -35,7 +35,8 @@
		*/
		typedef struct EventTag {
		uint32_t tagIndex;
		const char* tagStr;
		char* tagStr;
		size_t tagLen;
		} EventTag;

		/*
		@@ -139,7 +140,8 @@ LIBLOG_ABI_PUBLIC void android_closeEventTagMap(EventTagMap* map)
		*
		* The entries are sorted by tag number, so we can do a binary search.
		*/
		LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
		LIBLOG_ABI_PUBLIC const char* android_lookupEventTag_len(const EventTagMap* map,
		size_t *len,
		unsigned int tag)
		{
		int lo = 0;
		@@ -157,14 +159,36 @@ LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
		hi = mid - 1;
		} else {
		/* found */
		if (len) *len = map->tagArray[mid].tagLen;
		/*
		* b/31456426 to check if gTest can detect copy-on-write issue
		* add the following line to break us:
		* map->tagArray[mid].tagStr[map->tagArray[mid].tagLen] = '\0';
		* or explicitly use deprecated android_lookupEventTag().
		*/
		return map->tagArray[mid].tagStr;
		}
		}

		errno = ENOENT;
		if (len) *len = 0;
		return NULL;
		}

		LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
		unsigned int tag)
		{
		size_t len;
		const char* tagStr = android_lookupEventTag_len(map, &len, tag);
		char* cp;

		if (!tagStr) return tagStr;
		cp = (char*)tagStr;
		cp += len;
		if (cp) cp = '\0'; /* Trigger copy on write :-( */
		return tagStr;
		}

		/*
		* Crunch through the file, parsing the contents and creating a tag index.
		*/
		@@ -337,19 +361,13 @@ static int scanTagLine(char** pData, EventTag* tag, int lineNum)
		/* Determine whether "c" is a valid tag char. */
		while (isalnum(++cp) \|\| (cp == '_')) {
		}
		tag->tagLen = cp - tag->tagStr;

		if (*cp == '\n') {
		/* null terminate and return */
		*cp = '\0';
		} else if (isspace(*cp)) {
		/* CRLF or trailin spaces; zap this char, then scan for the '\n' */
		*cp = '\0';

		if (isspace(*cp)) {
		/* just ignore the rest of the line till \n
		TODO: read the tag description that follows the tag name
		*/
		while (*++cp != '\n') {
		}
		while (*cp != '\n') ++cp;
		} else {
		fprintf(stderr, "%s: invalid tag chars on line %d\n", OUT_TAG, lineNum);
		errno = EINVAL;
		@@ -387,10 +405,12 @@ static int sortTags(EventTagMap* map)
		for (i = 1; i < map->numTags; i++) {
		if (map->tagArray[i].tagIndex == map->tagArray[i - 1].tagIndex) {
		fprintf(stderr,
		"%s: duplicate tag entries (%" PRIu32 ":%s and %" PRIu32 ":%s)\n",
		"%s: duplicate tag entries (%" PRIu32 ":%.s and %" PRIu32 ":%.s)\n",
		OUT_TAG,
		map->tagArray[i].tagIndex, map->tagArray[i].tagStr,
		map->tagArray[i - 1].tagIndex, map->tagArray[i - 1].tagStr);
		map->tagArray[i].tagIndex, (int)map->tagArray[i].tagLen,
		map->tagArray[i].tagStr,
		map->tagArray[i - 1].tagIndex, (int)map->tagArray[i - 1].tagLen,
		map->tagArray[i - 1].tagStr);
		errno = EMLINK;
		return -1;
		}

liblog/fake_log_device.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -718,3 +718,12 @@ LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio,
		int logLevel = def;
		return logLevel >= 0 && prio >= logLevel;
		}

		LIBLOG_ABI_PUBLIC int __android_log_is_loggable_len(int prio,
		const char *tag __unused,
		size_t len __unused,
		int def)
		{
		int logLevel = def;
		return logLevel >= 0 && prio >= logLevel;
		}