liblog: have writers handle their own state
Remove the transport available and open functions since the writers
are able to manage their own state. Remove the initialization dance
with write_to_log, since it is unneeded once this is removed as well.
Remove the global lock around the close() functions as correct locking
has been added to the writers in a previous change.
Test: logging works, liblog-unit-tests
Change-Id: If7fa11e773763d0b5fcb2e696ad1c88ff4a4cfdf
diff --git a/liblog/logger_write.cpp b/liblog/logger_write.cpp
index 85475ec..d38b402 100644
--- a/liblog/logger_write.cpp
+++ b/liblog/logger_write.cpp
@@ -46,11 +46,8 @@
android_log_transport_write* android_log_persist_write = nullptr;
#endif
-static int __write_to_log_init(log_id_t, struct iovec* vec, size_t nr);
-static int (*write_to_log)(log_id_t, struct iovec* vec, size_t nr) = __write_to_log_init;
-
-static int check_log_uid_permissions() {
#if defined(__ANDROID__)
+static int check_log_uid_permissions() {
uid_t uid = __android_log_uid();
/* Matches clientHasLogCredentials() in logd */
@@ -87,43 +84,14 @@
}
}
}
-#endif
return 0;
}
-
-static void __android_log_cache_available(struct android_log_transport_write* node) {
- uint32_t i;
-
- if (node->logMask) {
- return;
- }
-
- for (i = LOG_ID_MIN; i < LOG_ID_MAX; ++i) {
- if (i != LOG_ID_KERNEL && (i != LOG_ID_SECURITY || check_log_uid_permissions() == 0) &&
- (*node->available)(static_cast<log_id_t>(i)) >= 0) {
- node->logMask |= 1 << i;
- }
- }
-}
+#endif
/*
* Release any logger resources. A new log write will immediately re-acquire.
*/
void __android_log_close() {
- __android_log_lock();
-
- write_to_log = __write_to_log_init;
-
- /*
- * Threads that are actively writing at this point are not held back
- * by a lock and are at risk of dropping the messages with a return code
- * -EBADF. Prefer to return error code than add the overhead of a lock to
- * each log writing call to guarantee delivery. In addition, anyone
- * calling this is doing so to release the logging resources and shut down,
- * for them to do so with outstanding log requests in other threads is a
- * disengenuous use of this function.
- */
-
if (android_log_write != nullptr) {
android_log_write->close();
}
@@ -132,44 +100,18 @@
android_log_persist_write->close();
}
- __android_log_unlock();
}
-static bool transport_initialize(android_log_transport_write* transport) {
- if (transport == nullptr) {
- return false;
- }
-
- __android_log_cache_available(transport);
- if (!transport->logMask) {
- return false;
- }
-
- // TODO: Do we actually need to call close() if open() fails?
- if (transport->open() < 0) {
- transport->close();
- return false;
- }
-
- return true;
-}
-
-/* log_init_lock assumed */
-static int __write_to_log_initialize() {
- if (!transport_initialize(android_log_write)) {
- return -ENODEV;
- }
-
- transport_initialize(android_log_persist_write);
-
- return 1;
-}
-
-static int __write_to_log_daemon(log_id_t log_id, struct iovec* vec, size_t nr) {
+static int write_to_log(log_id_t log_id, struct iovec* vec, size_t nr) {
int ret, save_errno;
struct timespec ts;
save_errno = errno;
+
+ if (log_id == LOG_ID_KERNEL) {
+ return -EINVAL;
+ }
+
#if defined(__ANDROID__)
clock_gettime(android_log_clockid(), &ts);
@@ -215,9 +157,8 @@
#endif
ret = 0;
- size_t i = 1 << log_id;
- if (android_log_write != nullptr && (android_log_write->logMask & i)) {
+ if (android_log_write != nullptr) {
ssize_t retval;
retval = android_log_write->write(log_id, &ts, vec, nr);
if (ret >= 0) {
@@ -225,7 +166,7 @@
}
}
- if (android_log_persist_write != nullptr && (android_log_persist_write->logMask & i)) {
+ if (android_log_persist_write != nullptr) {
android_log_persist_write->write(log_id, &ts, vec, nr);
}
@@ -233,29 +174,6 @@
return ret;
}
-static int __write_to_log_init(log_id_t log_id, struct iovec* vec, size_t nr) {
- int ret, save_errno = errno;
-
- __android_log_lock();
-
- if (write_to_log == __write_to_log_init) {
- ret = __write_to_log_initialize();
- if (ret < 0) {
- __android_log_unlock();
- errno = save_errno;
- return ret;
- }
-
- write_to_log = __write_to_log_daemon;
- }
-
- __android_log_unlock();
-
- ret = write_to_log(log_id, vec, nr);
- errno = save_errno;
- return ret;
-}
-
int __android_log_write(int prio, const char* tag, const char* msg) {
return __android_log_buf_write(LOG_ID_MAIN, prio, tag, msg);
}