android logcat 限制特定tag输出

system/core/liblog/logger_write.c

int log_filter( const char* tag )
{
    if( strcmp(tag, "xxxtag") == 0 ){
        return 0x00;
    }  
       
    return 0x01;
}
 

static int __write_to_log_daemon(log_id_t log_id, struct iovec* vec, size_t nr) {
  struct android_log_transport_write* node;

......

if (!__android_log_is_loggable_len(prio, tag, len - 1, ANDROID_LOG_VERBOSE)) {
      errno = save_errno;
      return -EPERM;
    }
    if( log_filter(tag) == 0x00 ){
        return 0x00;
    }
  

mmm system/core/liblog/ -j8

adb push  \out\target\product\xxxx\system\lib\liblog.so /system/lib/