liblog: logd: Add android_lookupEventTag_len()
Allows us to mitigate the impact of MAP_PRIVATE and copy on write by
calling android_lookupEventTag_len instead of android_lookupEventTag,
and delaying the copy on write impact to the later. We return a
string length in a supplied location along with the string pointer
with android_lookupEventTag_len(const EventTagMap* map, size_t* len,
int tag). The string is not guaranteed to be nul terminated. Since
android_lookupEventTag() called even once can cause the memory
impact, we will mark it as deprecated, but we currently have no
timeframe for removal since this is a very old interface.
Add an API for __android_log_is_loggable_len() that accepts the non
null terminated content and fixup callers that would gain because the
length is known prior to the call either in the compiler or at
runtime. Tackle transition to android_lookupEventTag_len() and
fixup callers.
On any application that performs logging (eg: com.android.phone)
/proc/<pid>/smaps before:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 463 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 0 kB
Shared_Dirty: 20 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 20 kB
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
/proc/<pid>/smaps after:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 1773 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 20 kB (was 0kB)
Shared_Dirty: 0 kB (was 20kB)
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 20 kB (was 0kB)
Anonymous: 0 kB (was 20kB)
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
Added liblog-unit-tests --gtest_filter=liblog.event_log_tags to
check for Shared_Clean: to not be 0 and Anonymous: to be 0 for
all processes referencing event-log-tags. Which can include multiple
references to /system/etc/event-log-tags and future possible refs to
/data/misc/logd/event-log-tags and /dev/event-log-tags. We want
failure messages to help point to errant code using the deprecated
interface.
This change saves 1/4MB of memory or more on a typical system.
Test: gTest liblog-unit-tests
Bug: 31456426
Change-Id: I9e08e44d9092bd96fe704b5709242e7195281d33
diff --git a/include/android/log.h b/include/android/log.h
index de5502a..5f20f8c 100644
--- a/include/android/log.h
+++ b/include/android/log.h
@@ -803,10 +803,12 @@
*/
#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 @@
* 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 */
diff --git a/include/log/event_tag_map.h b/include/log/event_tag_map.h
index 7ee0a7c..69774ba 100644
--- a/include/log/event_tag_map.h
+++ b/include/log/event_tag_map.h
@@ -41,7 +41,14 @@
/*
* 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
}
diff --git a/include/log/logprint.h b/include/log/logprint.h
index b8d8d4c..f70633d 100644
--- a/include/log/logprint.h
+++ b/include/log/logprint.h
@@ -59,6 +59,7 @@
int32_t pid;
int32_t tid;
const char * tag;
+ size_t tagLen;
size_t messageLen;
const char * message;
} AndroidLogEntry;
diff --git a/liblog/event_tag_map.c b/liblog/event_tag_map.c
index c2dc74c..6705fb2 100644
--- a/liblog/event_tag_map.c
+++ b/liblog/event_tag_map.c
@@ -34,8 +34,9 @@
* Single entry.
*/
typedef struct EventTag {
- uint32_t tagIndex;
- const char* tagStr;
+ uint32_t tagIndex;
+ char* tagStr;
+ size_t tagLen;
} EventTag;
/*
@@ -139,8 +140,9 @@
*
* The entries are sorted by tag number, so we can do a binary search.
*/
-LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
- unsigned int tag)
+LIBLOG_ABI_PUBLIC const char* android_lookupEventTag_len(const EventTagMap* map,
+ size_t *len,
+ unsigned int tag)
{
int lo = 0;
int hi = map->numTags - 1;
@@ -157,14 +159,36 @@
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 @@
/* 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 @@
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;
}
diff --git a/liblog/fake_log_device.c b/liblog/fake_log_device.c
index 1b57e75..7bd1f83 100644
--- a/liblog/fake_log_device.c
+++ b/liblog/fake_log_device.c
@@ -718,3 +718,12 @@
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;
+}
diff --git a/liblog/log_is_loggable.c b/liblog/log_is_loggable.c
index bd8d5af..4af8507 100644
--- a/liblog/log_is_loggable.c
+++ b/liblog/log_is_loggable.c
@@ -85,13 +85,13 @@
}
}
-static int __android_log_level(const char *tag, int default_prio)
+static int __android_log_level(const char *tag, size_t len, int default_prio)
{
/* sizeof() is used on this array below */
static const char log_namespace[] = "persist.log.tag.";
static const size_t base_offset = 8; /* skip "persist." */
/* calculate the size of our key temporary buffer */
- const size_t taglen = (tag && *tag) ? strlen(tag) : 0;
+ const size_t taglen = tag ? len : 0;
/* sizeof(log_namespace) = strlen(log_namespace) + 1 */
char key[sizeof(log_namespace) + taglen]; /* may be > PROPERTY_KEY_MAX */
char *kp;
@@ -147,7 +147,11 @@
if (!not_locked) {
if (!last_tag[0]
|| (last_tag[0] != tag[0])
- || strncmp(last_tag + 1, tag + 1, sizeof(last_tag) - 1)) {
+ || strncmp(last_tag + 1, tag + 1,
+ (len < sizeof(last_tag)) ?
+ (len - 1) :
+ (sizeof(last_tag) - 1))
+ || ((len < sizeof(last_tag)) && last_tag[len])) {
/* invalidate log.tag.<tag> cache */
for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
tag_cache[i].pinfo = NULL;
@@ -157,10 +161,16 @@
local_change_detected = 1;
}
if (!last_tag[0]) {
- strncpy(last_tag, tag, sizeof(last_tag));
+ if (len < sizeof(last_tag)) {
+ strncpy(last_tag, tag, len);
+ last_tag[len] = '\0';
+ } else {
+ strncpy(last_tag, tag, sizeof(last_tag));
+ }
}
}
- strcpy(key + sizeof(log_namespace) - 1, tag);
+ strncpy(key + sizeof(log_namespace) - 1, tag, len);
+ key[sizeof(log_namespace) - 1 + len] = '\0';
kp = key;
for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
@@ -246,10 +256,21 @@
return default_prio;
}
-LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio, const char *tag,
+LIBLOG_ABI_PUBLIC int __android_log_is_loggable_len(int prio,
+ const char *tag, size_t len,
+ int default_prio)
+{
+ int logLevel = __android_log_level(tag, len, default_prio);
+ return logLevel >= 0 && prio >= logLevel;
+}
+
+LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio,
+ const char *tag,
int default_prio)
{
- int logLevel = __android_log_level(tag, default_prio);
+ int logLevel = __android_log_level(tag,
+ (tag && *tag) ? strlen(tag) : 0,
+ default_prio);
return logLevel >= 0 && prio >= logLevel;
}
diff --git a/liblog/logd_writer.c b/liblog/logd_writer.c
index ebf8b3e..e8e392d 100644
--- a/liblog/logd_writer.c
+++ b/liblog/logd_writer.c
@@ -181,9 +181,9 @@
}
}
snapshot = atomic_exchange_explicit(&dropped, 0, memory_order_relaxed);
- if (snapshot && __android_log_is_loggable(ANDROID_LOG_INFO,
- "liblog",
- ANDROID_LOG_VERBOSE)) {
+ if (snapshot && __android_log_is_loggable_len(ANDROID_LOG_INFO,
+ "liblog", strlen("liblog"),
+ ANDROID_LOG_VERBOSE)) {
android_log_event_int_t buffer;
header.id = LOG_ID_EVENTS;
diff --git a/liblog/logger_write.c b/liblog/logger_write.c
index 4999aef..1e56b27 100644
--- a/liblog/logger_write.c
+++ b/liblog/logger_write.c
@@ -279,6 +279,7 @@
}
} else if (log_id == LOG_ID_EVENTS) {
const char *tag;
+ size_t len;
EventTagMap *m, *f;
if (vec[0].iov_len < 4) {
@@ -286,6 +287,7 @@
}
tag = NULL;
+ len = 0;
f = NULL;
m = (EventTagMap *)atomic_load(&tagMap);
@@ -308,11 +310,11 @@
}
}
if (m && (m != (EventTagMap *)(uintptr_t)-1LL)) {
- tag = android_lookupEventTag(m, get4LE(vec[0].iov_base));
+ tag = android_lookupEventTag_len(m, &len, get4LE(vec[0].iov_base));
}
- ret = __android_log_is_loggable(ANDROID_LOG_INFO,
- tag,
- ANDROID_LOG_VERBOSE);
+ ret = __android_log_is_loggable_len(ANDROID_LOG_INFO,
+ tag, len,
+ ANDROID_LOG_VERBOSE);
if (f) { /* local copy marked for close */
android_closeEventTagMap(f);
}
@@ -345,7 +347,9 @@
tag = NULL;
}
- if (!__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE)) {
+ if (!__android_log_is_loggable_len(prio,
+ tag, len - 1,
+ ANDROID_LOG_VERBOSE)) {
return -EPERM;
}
}
diff --git a/liblog/logprint.c b/liblog/logprint.c
index d857090..2c4e619 100644
--- a/liblog/logprint.c
+++ b/liblog/logprint.c
@@ -539,6 +539,7 @@
entry->priority = msg[0];
entry->tag = msg + 1;
+ entry->tagLen = msgStart - 1;
entry->message = msg + msgStart;
entry->messageLen = (msgEnd < msgStart) ? 0 : (msgEnd - msgStart);
@@ -801,8 +802,9 @@
eventData += 4;
inCount -= 4;
+ entry->tagLen = 0;
if (map != NULL) {
- entry->tag = android_lookupEventTag(map, tagIndex);
+ entry->tag = android_lookupEventTag_len(map, &entry->tagLen, tagIndex);
} else {
entry->tag = NULL;
}
@@ -813,12 +815,16 @@
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
- int tagLen;
+ size_t tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
+ if (tagLen >= (size_t)messageBufLen) {
+ tagLen = messageBufLen - 1;
+ }
entry->tag = messageBuf;
- messageBuf += tagLen+1;
- messageBufLen -= tagLen+1;
+ entry->tagLen = tagLen;
+ messageBuf += tagLen + 1;
+ messageBufLen -= tagLen + 1;
}
/*
@@ -1386,13 +1392,13 @@
switch (p_format->format) {
case FORMAT_TAG:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
- "%c/%-8s: ", priChar, entry->tag);
+ "%c/%-8.*s: ", priChar, (int)entry->tagLen, entry->tag);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_PROCESS:
len = snprintf(suffixBuf + suffixLen, sizeof(suffixBuf) - suffixLen,
- " (%s)\n", entry->tag);
+ " (%.*s)\n", (int)entry->tagLen, entry->tag);
suffixLen += MIN(len, sizeof(suffixBuf) - suffixLen);
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%c(%s%5d) ", priChar, uid, entry->pid);
@@ -1411,8 +1417,8 @@
break;
case FORMAT_TIME:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
- "%s %c/%-8s(%s%5d): ", timeBuf, priChar, entry->tag,
- uid, entry->pid);
+ "%s %c/%-8.*s(%s%5d): ", timeBuf, priChar,
+ (int)entry->tagLen, entry->tag, uid, entry->pid);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
@@ -1422,15 +1428,16 @@
*ret = ' ';
}
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
- "%s %s%5d %5d %c %-8s: ", timeBuf,
- uid, entry->pid, entry->tid, priChar, entry->tag);
+ "%s %s%5d %5d %c %-8.*s: ", timeBuf, uid, entry->pid,
+ entry->tid, priChar, (int)entry->tagLen, entry->tag);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_LONG:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
- "[ %s %s%5d:%5d %c/%-8s ]\n",
- timeBuf, uid, entry->pid, entry->tid, priChar, entry->tag);
+ "[ %s %s%5d:%5d %c/%-8.*s ]\n",
+ timeBuf, uid, entry->pid, entry->tid, priChar,
+ (int)entry->tagLen, entry->tag);
strcpy(suffixBuf + suffixLen, "\n\n");
suffixLen += 2;
prefixSuffixIsHeaderFooter = 1;
@@ -1438,7 +1445,8 @@
case FORMAT_BRIEF:
default:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
- "%c/%-8s(%s%5d): ", priChar, entry->tag, uid, entry->pid);
+ "%c/%-8.*s(%s%5d): ", priChar, (int)entry->tagLen, entry->tag,
+ uid, entry->pid);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
diff --git a/liblog/tests/Android.mk b/liblog/tests/Android.mk
index 8229859..a755b98 100644
--- a/liblog/tests/Android.mk
+++ b/liblog/tests/Android.mk
@@ -40,7 +40,7 @@
LOCAL_MODULE := $(test_module_prefix)benchmarks
LOCAL_MODULE_TAGS := $(test_tags)
LOCAL_CFLAGS += $(benchmark_c_flags)
-LOCAL_SHARED_LIBRARIES += liblog libm
+LOCAL_SHARED_LIBRARIES += liblog libm libbase
LOCAL_SRC_FILES := $(benchmark_src_files)
include $(BUILD_NATIVE_TEST)
@@ -73,6 +73,6 @@
LOCAL_MODULE := $(test_module_prefix)unit-tests
LOCAL_MODULE_TAGS := $(test_tags)
LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_SHARED_LIBRARIES := liblog libcutils libbase
LOCAL_SRC_FILES := $(test_src_files)
include $(BUILD_NATIVE_TEST)
diff --git a/liblog/tests/liblog_benchmark.cpp b/liblog/tests/liblog_benchmark.cpp
index 7561d8f..cd012ce 100644
--- a/liblog/tests/liblog_benchmark.cpp
+++ b/liblog/tests/liblog_benchmark.cpp
@@ -650,10 +650,14 @@
* Measure the time it takes for __android_log_is_loggable.
*/
static void BM_is_loggable(int iters) {
+ static const char logd[] = "logd";
+
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
- __android_log_is_loggable(ANDROID_LOG_WARN, "logd", ANDROID_LOG_VERBOSE);
+ __android_log_is_loggable_len(ANDROID_LOG_WARN,
+ logd, strlen(logd),
+ ANDROID_LOG_VERBOSE);
}
StopBenchmarkTiming();
diff --git a/liblog/tests/liblog_test.cpp b/liblog/tests/liblog_test.cpp
index 6e709a9..b1dae9e 100644
--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -14,6 +14,8 @@
* limitations under the License.
*/
+#include <ctype.h>
+#include <dirent.h>
#include <fcntl.h>
#include <inttypes.h>
#include <semaphore.h>
@@ -22,7 +24,11 @@
#include <sys/types.h>
#include <unistd.h>
+#include <string>
+
#include <android/log.h>
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
#include <cutils/properties.h>
#include <gtest/gtest.h>
#include <log/logger.h>
@@ -1337,8 +1343,8 @@
continue;
}
fprintf(stderr, "i=%zu j=%zu\r", i, j);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, levels[j].level);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)) {
if (android_log_is_loggable) {
@@ -1346,8 +1352,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, levels[j].level));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level));
}
} else {
if (!android_log_is_loggable) {
@@ -1355,8 +1361,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, levels[j].level));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level));
}
}
}
@@ -1377,8 +1383,8 @@
i, j, key, buf);
usleep(20000);
property_set(key, buf);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1388,8 +1394,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1397,8 +1403,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1407,8 +1413,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1418,8 +1424,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1427,8 +1433,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1439,8 +1445,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key, buf);
property_set(key, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1450,8 +1456,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1459,8 +1465,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1469,8 +1475,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1480,8 +1486,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1489,8 +1495,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1517,8 +1523,8 @@
i, j, key, buf);
usleep(20000);
property_set(key, buf);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_INFO) // Yes INFO
@@ -1528,8 +1534,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1537,8 +1543,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1547,8 +1553,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_INFO) // Yes INFO
@@ -1558,8 +1564,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1567,8 +1573,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -2617,3 +2623,83 @@
EXPECT_LT(0, ret);
EXPECT_EQ(1U, signaled);
}
+
+// meant to be handed to ASSERT_TRUE / EXPECT_TRUE only to expand the message
+static testing::AssertionResult IsOk(bool ok, std::string &message) {
+ return ok ?
+ testing::AssertionSuccess() :
+ (testing::AssertionFailure() << message);
+}
+
+static void event_log_tags_test_smap(pid_t pid) {
+ std::string filename = android::base::StringPrintf("/proc/%d/smaps", pid);
+
+ std::string content;
+ if (!android::base::ReadFileToString(filename, &content)) return;
+
+ bool shared_ok = false;
+ bool anonymous_ok = false;
+ bool pass_ok = false;
+
+ static const char event_log_tags[] = "event-log-tags";
+ std::string::size_type pos = 0;
+ while ((pos = content.find(event_log_tags, pos)) != std::string::npos) {
+ pos += strlen(event_log_tags);
+
+ // must not be: 'Shared_Clean: 0 kB'
+ static const char shared_clean[] = "Shared_Clean:";
+ std::string::size_type clean = content.find(shared_clean, pos);
+ bool ok = (clean != std::string::npos) &&
+ ((clean = content.find_first_not_of(" \t", clean +
+ strlen(shared_clean))) != std::string::npos) &&
+ (content.find_first_not_of("123456789", clean) != clean);
+ if (ok && !pass_ok) {
+ shared_ok = true;
+ } else if (!ok) {
+ shared_ok = false;
+ }
+
+ // must be: 'Anonymous: 0 kB'
+ static const char anonymous[] = "Anonymous:";
+ std::string::size_type anon = content.find(anonymous, pos);
+ ok = (anon != std::string::npos) &&
+ ((anon = content.find_first_not_of(" \t", anon +
+ strlen(anonymous))) != std::string::npos) &&
+ (content.find_first_not_of("0", anon) != anon);
+ if (ok && !pass_ok) {
+ anonymous_ok = true;
+ } else if (!ok) {
+ anonymous_ok = false;
+ }
+
+ pass_ok = true;
+ }
+ content = "";
+
+ if (!pass_ok) return;
+ if (shared_ok && anonymous_ok) return;
+
+ filename = android::base::StringPrintf("/proc/%d/comm", pid);
+ android::base::ReadFileToString(filename, &content);
+ content = android::base::StringPrintf("%d:%s",
+ pid, content.substr(0, content.find("\n")).c_str());
+
+ EXPECT_TRUE(IsOk(shared_ok, content));
+ EXPECT_TRUE(IsOk(anonymous_ok, content));
+}
+
+TEST(liblog, event_log_tags) {
+ std::unique_ptr<DIR, int(*)(DIR*)> proc_dir(opendir("/proc"), closedir);
+ ASSERT_FALSE(!proc_dir);
+
+ dirent* e;
+ while ((e = readdir(proc_dir.get()))) {
+ if (e->d_type != DT_DIR) continue;
+ if (!isdigit(e->d_name[0])) continue;
+ long long id = atoll(e->d_name);
+ if (id <= 0) continue;
+ pid_t pid = id;
+ if (id != pid) continue;
+ event_log_tags_test_smap(pid);
+ }
+}
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 1ecf99c..7f5fe4f 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -211,13 +211,15 @@
if (log_id != LOG_ID_SECURITY) {
int prio = ANDROID_LOG_INFO;
const char *tag = NULL;
+ size_t len = 0;
if (log_id == LOG_ID_EVENTS) {
- tag = android::tagToName(elem->getTag());
+ tag = android::tagToName(&len, elem->getTag());
} else {
prio = *msg;
tag = msg + 1;
+ len = strlen(tag);
}
- if (!__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE)) {
+ if (!__android_log_is_loggable_len(prio, tag, len, ANDROID_LOG_VERBOSE)) {
// Log traffic received to total
pthread_mutex_lock(&mLogElementsLock);
stats.add(elem);
diff --git a/logd/LogBufferElement.cpp b/logd/LogBufferElement.cpp
index 3e6e586..e5de11d 100644
--- a/logd/LogBufferElement.cpp
+++ b/logd/LogBufferElement.cpp
@@ -110,7 +110,9 @@
LogBuffer *parent) {
static const char tag[] = "chatty";
- if (!__android_log_is_loggable(ANDROID_LOG_INFO, tag, ANDROID_LOG_VERBOSE)) {
+ if (!__android_log_is_loggable_len(ANDROID_LOG_INFO,
+ tag, strlen(tag),
+ ANDROID_LOG_VERBOSE)) {
return 0;
}
diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index 86d33b2..c6ebd52 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -436,11 +436,12 @@
name = android::base::StringPrintf("%7u/%u",
getKey(), uid);
}
- const char *nameTmp = getName();
+ size_t len = 0;
+ const char *nameTmp = getName(len);
if (nameTmp) {
name += android::base::StringPrintf(
- "%*s%s", (int)std::max(14 - name.length(), (size_t)1),
- "", nameTmp);
+ "%*s%.*s", (int)std::max(14 - name.length(), (size_t)1),
+ "", (int)len, nameTmp);
}
std::string size = android::base::StringPrintf("%zu",
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index e811953..bfaafa4 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -385,7 +385,7 @@
const uint32_t&getKey() const { return tag; }
const pid_t&getPid() const { return pid; }
const uid_t&getUid() const { return uid; }
- const char*getName() const { return android::tagToName(tag); }
+ const char*getName(size_t &len) const { return android::tagToName(&len, tag); }
inline void add(LogBufferElement *element) {
if (uid != element->getUid()) {
diff --git a/logd/LogUtils.h b/logd/LogUtils.h
index 939515e..6db4c51 100644
--- a/logd/LogUtils.h
+++ b/logd/LogUtils.h
@@ -37,7 +37,7 @@
char *tidToName(pid_t tid);
// Furnished in main.cpp. Thread safe.
-const char *tagToName(uint32_t tag);
+const char *tagToName(size_t *len, uint32_t tag);
}
diff --git a/logd/main.cpp b/logd/main.cpp
index 77a6973..a0cea25 100644
--- a/logd/main.cpp
+++ b/logd/main.cpp
@@ -302,7 +302,7 @@
}
// tagToName converts an events tag into a name
-const char *android::tagToName(uint32_t tag) {
+const char *android::tagToName(size_t *len, uint32_t tag) {
static const EventTagMap *map;
if (!map) {
@@ -312,10 +312,11 @@
}
sem_post(&sem_name);
if (!map) {
+ if (len) len = 0;
return NULL;
}
}
- return android_lookupEventTag(map, tag);
+ return android_lookupEventTag_len(map, len, tag);
}
static void readDmesg(LogAudit *al, LogKlog *kl) {