/*
* Receive a log message. We happen to know that "vector" has three parts:
*
* priority (1 byte)
* tag (N bytes -- null-terminated ASCII string)
* message (N bytes -- null-terminated ASCII string)
*/
static ssize_t logWritev(int fd, const struct iovec* vector, int count)
{
LogState* state;
DECLARE_SIGSET(sigflags);
/* Make sure that no-one frees the LogState while we're using it.
* Also guarantees that only one thread is in showLog() at a given
* time (if it matters).
*/
lock(&sigflags);
state = fdToLogState(fd);
if (state == NULL) {
errno = EBADF;
goto error;
}
if (state->isBinary) {
TRACE("%s: ignoring binary log\n", state->debugName);
goto bail;
}
if (count != 3) {
TRACE("%s: writevLog with count=%d not expected\n",
state->debugName, count);
goto error;
}
/* pull out the three fields */
int logPrio = *(const char*)vector[0].iov_base;
const char* tag = (const char*) vector[1].iov_base;
const char* msg = (const char*) vector[2].iov_base;
/* see if this log tag is configured */
int i;
int minPrio = state->globalMinPriority;
for (i = 0; i < kTagSetSize; i++) {
if (state->tagSet[i].minPriority == ANDROID_LOG_UNKNOWN)
break; /* reached end of configured values */
if (strcmp(state->tagSet[i].tag, tag) == 0) {
//TRACE("MATCH tag '%s'\n", tag);
minPrio = state->tagSet[i].minPriority;
break;
}
}
if (logPrio >= minPrio) {
showLog(state, logPrio, tag, msg);
} else {
//TRACE("+++ NOLOG(%d): %s %s", logPrio, tag, msg);
}
bail:
unlock(&sigflags);
return vector[0].iov_len + vector[1].iov_len + vector[2].iov_len;
error:
unlock(&sigflags);
return -1;
}
/*
* Unregister the fake fd and free the memory it pointed to.
*/
static void deleteFakeFd(int fd)
{
LogState *ls;
lock();
ls = fdToLogState(fd);
if (ls != NULL) {
openLogTable[fd - FAKE_FD_BASE] = NULL;
free(ls->debugName);
free(ls);
}
unlock();
}
