sergeyklay

Description

Frame pointer omission does make debugging significantly harder. Local variables are harder to locate and stack traces are much harder to reconstruct without a frame pointer to help out. Also, accessing parameters can get more expensive since they are far away from the top of the stack and may require more expensive addressing modes.

The -fno-omit-frame-pointer option direct the compiler to generate code that maintains and uses stack frame pointer for all functions so that a debugger can still produce a stack backtrace even with optimizations flags.

Irrespective if you use the flag, not every function needs a frame pointer in the first place, so you can't always expect a difference with the flag.

Also, whether the function has a frame pointer is an implementation detail. Compilers can differ in implementation details (and usually they do).

sergeyklay

import java.util.Stack
import java.lang.Long.parseLong

fun String.isNumeric(): Boolean {
    return try {
        parseLong(this)
        true
    } catch (e: NumberFormatException) {
        false
    }

sergeyklay

#!/bin/bash
# bash generate random alphanumeric string
#

# bash generate random 32 character alphanumeric string (upper and lowercase) and 
NEW_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)

# bash generate random 32 character alphanumeric string (lowercase only)
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1

sergeyklay

[Unit]
Description=My service

[Service]
ExecStart=/usr/local/bin/my-service \
  -argument value \
  -otherargument othervalue

# Setuid/Setgid
User=nobody

sergeyklay

Journalctl Cheat Sheet

Configuration

Permissions

To see messages from other users and the system as well as performing various log operations from a regular user add it to the group:

sudo usermod -aG systemd-journal $USER

sergeyklay

(defn- normalize-verison
  [version]
  (let [[x y z] (map read-string (clojure.string/split version #"\."))
        z (or z 0)]
    (+ (* x 10000) (* y 100) z)))

(defn version-compare
  [a b]
  (let [left (normalize-verison a)
        right (normalize-verison b)]

sergeyklay

$ telnet-ssl -z ssl imap.gmail.com 993
Trying 173.194.222.109...
Connected to gmail-imap.l.google.com.
Escape character is '^]'.
* OK Gimap ready for requests from 193.201.216.169 z8mb75199760ljk
a1 LOGIN [email protected] my-password-here
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT LIST-EXTENDED LIST-STATUS LITERAL- SPECIAL-USE APPENDLIMIT=35651584
a1 OK [email protected] authenticated (Success)
a2 LIST "" "*"
* LIST (\HasNoChildren) "/" "INBOX"

sergeyklay

package main

import (
	"fmt"
	"golang.org/x/net/context"
	cc "golang.org/x/oauth2/clientcredentials"
	"io/ioutil"
	"net/http"
	"os"
)

sergeyklay

(require 'json)

(defvar owm/base-api-url "api.openweathermap.org")
(defvar owm/base-api-ver 2.5)
(defvar owm/api-key "PUT_API_KEY_HERE")

(defvar owm/default-scheme "https")

(defun owm/build-url (appid lat lon lang units)
  (let* ((local (format "data/%s/weather" owm/base-api-ver))

sergeyklay

;;; Directory Local Variables
;; For more information see (info "(emacs) Directory Variables")

((nil . ((indent-tabs-mode . t)
         (fill-column . 80)))
 (c-mode . ((c-file-style . "k&r")
            (tab-width . 4)
            (c-basic-offset . 4)
            (flycheck-checker . c/c++-gcc)
            (flycheck-disabled-checkers c/c++-clang)