nikhilm

#lang racket/base
(define kont #f)
(define my-prompt (make-continuation-prompt-tag))

(begin
  (call-with-continuation-prompt
   (λ ()
     (printf "Before everything~n")
     (printf "The call current/composable returned ~v~n"
             (call/cc

nikhilm

{
    inputStream: {
        name: "Live",
        type: "LiveStream",
        constraints: {
            width: {min:640},
            height: {min:480},
            facingMode: "environment",
            aspectRatio: {min:1,max:2},
        },

nikhilm

#!/bin/bash
# All credit for figuring out these incantations goes to https://utcc.utoronto.ca/~cks/space/blog/linux/CgroupsForMemoryLimiting
#
# Script to run a command in a v1 cgroup limiting CPU and memory.
# Use as `./confine.sh command <other args>`.
# This is tested on Ubuntu Bionic.
# You will need to install the `cgroup-tools` package from `apt` first.
# Remember to tweak the limits based on your machine.
# `sudo` is required to create the cgroup, but the build itself is run as a normal user.

nikhilm

import time

import adafruit_ble
from adafruit_ble import BLERadio
from adafruit_ble.advertising import Advertisement
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.standard.device_info import DeviceInfoService
# from adafruit_ble.services.standard.hid import HIDService
from adafruit_circuitplayground import cp

nikhilm

[package]
edition = "2018"
name = "hello_world"
version = "0.1.0"

[lib]
crate-type = ["staticlib"]
name = "hello_world"

[dependencies]

nikhilm

[package]
name = "testatty"
version = "0.1.0"
authors = ["vagrant"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
atty = { path= "../atty"}

nikhilm

When a debugger, profiler or crash reporter is unwinding the call stack, can it reliably retrieve the function arguments of every function in the stack?

I originally intended for this to be a later part of the [Sampling Profilers]({{< ref "/post/2018/sampling-profiler-internals-introduction" >}}) series, but a recent discussion with Ben Frederickson, and his [subsequent py-spy implementation][] helped crystallize my thoughts and I figured I'd write it down separately.

nikhilm

#!/bin/sh
# #!/usr/bin/sh
#
# opensnoop - snoop file opens as they occur.
#             Written using DTrace (Solaris 10 3/05).
#
# 12-Jan-2006, ver 1.60
#
# USAGE:	opensnoop [-a|-A|-ceghstvxZ] [-f pathname] [-n name] [-p PID]
#

nikhilm

2016/11/12 00:29:20 Pinged successfully
&{d4d32563d909d603a6b1d604d6902b942c922e10d838ca5683ca48f4f5c23234 [treeder/hello:latest] 94f30c9c34c2234448f1f8abf62b256fdbde30542b526fa2ee9cdba3ecba28b5  2016-10-06 00:00:00.264 +0000 UTC  {4c573a7cf4a3   0 0 0 0 0  [] map[]   [PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin] [/bin/sh -c #(nop)  ENTRYPOINT ["sh" "hello.sh"]] <nil> [] sha256:a52e7dd7e1b87c43a90db766ebe79563a38cff39a0d14ccfdad0069e741d612e map[]  /app  [sh hello.sh] [] [] [] map[] false false false false false false false false } 1.9.0  0xc420348000 amd64 0 0 [] <nil>} <nil>
pull <nil>
Create <nil> API error (500): (InternalError) Internal error (0f9925f0-a86f-11e6-a25b-37d5ab1798cf)

nikhilm

// This is a reduced test case for https://github.com/go-mgo/mgo/issues/254
//
// What it does is to overload DialServer() and return a custom net.Conn.
// Some of these custom connections timeout _once_ after the first 1000 bytes are read.
// It seems like DialServer() is called more times than the PoolLimit, which is
// set to 5, and not all these sockets are used, so for convenience, we pick
// every third connection to automatically time out once.
// It is still possible for this test to be slightly flaky, you may have to run it more than once.
//
// Remember to edit the Dial URL and the database name in insert to something valid.