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// Tracks the origin of net_udp_rcvbuferrors, printing socket metadata associated with the packet drops.
//
// usage: bpftrace trace_udp_rcvbuferrors.bt
// sample output:
// 12:32:25 iperf3/3391 ::ffff:192.168.60.3:5201 -> ::ffff:192.168.60.1:50512 retval=-1 dropped=23809 qlen=36 qsize/qmaxsize=213248/212992 bytes

kprobe:udp_queue_rcv_skb
{
  $sock = (struct sock *)arg0;
  if ($sock->sk_type != SOCK_DGRAM || ($sock->__sk_common.skc_family != AF_INET && $sock->__sk_common.skc_family != AF_INET6)) {

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Chains of recurrences -- a method to expedite the evaluation of closed-form functions
On computational properties of chains of recurrences
Symbolic Evaluation of Chains of Recurrences for Loop Optimization
Efficient Symbolic Analysis for Optimizing Compilers
Using the chains of recurrences algebra for data dependence testing and induction variable substitution

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• Gstreamer Pipeline Samples
  • Video
    • display test video
    • record to file
    • record and display at the same time(queue)
    • record webcam to *.mp4(jetson nano)
    • fps test
  • Audio
  • Mux Video and Audio
• Media File

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void __cdecl main_main()
{
  __int64 *v0; // rdi
  __int64 v1; // rdi
  __int64 v2; // rax
  __int64 v3; // rax
  __int64 v4; // rcx
  const char *v5; // rdx
  __int128 v6; // rax
  __int64 v7; // rcx

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gdbus call -e -d org.gnome.Shell -o /org/gnome/Shell -m org.gnome.Shell.Eval "global.get_window_actors().filter(a=>a.meta_window.has_focus()===true)[0]?.get_meta_window()?.get_wm_class()"

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Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For generic skin emulator with default apis (without google apis):

1. List All System Images Available for Download: sdkmanager --list | grep system-images

2. Download Image: sdkmanager --install "system-images;android-29;default;x86"

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type Hasher interface {
   Compute(
      context.Context,
      hash Hash, 
      new map[string]string,
   ) (Hash, error)
}

type Changeset interface {
   Change(

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// -*- mode:go;mode:go-playground -*-
// snippet of code @ 2020-11-14 14:23:30

// === Go Playground ===
// Execute the snippet with Ctl-Return
// Provide custom arguments to compile with Alt-Return
// Remove the snippet completely with its dir and all files M-x `go-playground-rm`
package main

import (

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// rust rmsbolt starter file

// Local Variables:
// rmsbolt-command: "rustc -C opt-level=0"
// rmsbolt-disassemble: nil
// End:

fn is_rms(a: char) -> i32 {
    match a {
        'R' => 1,

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psql (12.4, server 9.5.0)
Type "help" for help.

sample=# create table sample (id integer, metadata jsonb) ;
CREATE TABLE
sample=# insert into sample values (1, '{"test" : { "test" : 1 }}'::jsonb);
INSERT 0 1
sample=# select * from sample;
 id |       metadata        
----+-----------------------