elazarl’s gists

elazarl / poll_dev.c

Created June 18, 2013 14:33

A simple test to determine if your OS allows polling devices, e.g. /dev/null

	#include <stdio.h>
	#include <poll.h>

	#include <fcntl.h>

	int main() {
	int fd = open("/dev/null", O_WRONLY);
	struct pollfd pollfds = { fd, POLLOUT, 0 };
	if (fd < 0) {
	perror("open");

elazarl / NoLoopBackSocket.java

Created June 11, 2013 06:48

This test shows that Java will not allow a socket to connect to itself via TCP's simultaneous connection feature, by setting the source port identical to the destination port.

	import org.junit.Test;

	import java.net.InetAddress;
	import java.net.InetSocketAddress;
	import java.net.Socket;
	import java.net.SocketException;

	/**
	* This tests make sure Java prevents a socket from connecting to itself
	* via binding to the same port it connects to

elazarl / tcpsymcon.go

Created June 11, 2013 06:36

This code snippet demonstrate the tcp simultaneous connection feature. No one of the goroutines has a listening socket, yet, when both try to connect to each other simultaneously the connection succeeds. I've yet to understand what is this feature good for, I definitely know what is it not good for: http://golang.org/src/pkg/net/tcpsock_posix.go…

	package main

	import "fmt"
	import "net"

	var localhost = net.ParseIP("127.0.0.1")

	var port1, port2 = 1220, 1229
	func conwrite() {
	c1, err := net.DialTCP("tcp", &net.TCPAddr{localhost, port2}, &net.TCPAddr{localhost, port1})

elazarl / cp.go

Last active June 27, 2020 14:42

Unfortunately, searching for "golang copy file" gives subtly wrong code snippets (e.g. https://groups.google.com/d/msg/golang-nuts/JNyQxQLyf5o/kbGnTUK32TkJ that don't check close error code). This is an attempt to copy file content from `src` to `dst`

	package cp

	import (
	"io"
	"os"
	)

	func cp(dst, src string) error {
	s, err := os.Open(src)
	if err != nil {

elazarl / byam_lavan.go

Created April 25, 2012 13:07

	package main

	import (
	"io"
	"os"
	"time"
	)

	func singLine(line string,w io.Writer) {
	time.Sleep(time.Second)

elazarl / partialResp.go

Created March 25, 2012 18:11

A draft code to read a partial response from http server

	package main

	import ("bufio"
	"fmt"
	"io"
	"net/http"
	"net"
	"strings")

	type readFirstCloseSecond struct {

elazarl / clientDoGzip.go

Created March 16, 2012 15:01

Client.Do will not uncompress response body

	package main

	// run this file with `go run clientDoGzip.go, and then file tmp.out to verify body is gzipped

	import "net/http"
	import "io/ioutil"
	import "bytes"
	import "fmt"
	import "log"
	import "compress/gzip"

elazarl / BencodeWriter.java

Created February 1, 2012 17:00

A simple bencode encoder that can handle streaming data

	class BencodeWriter {
	static class SizedInputStream {
	public InputStream stream;
	public int size;
	public SizedInputStream(InputStream _stream,int _size) {stream = _stream;size = _size;}
	}
	public static class BencodeProducer {
	private OutputStream out;
	public BencodeProducer(OutputStream o) {out = o;}

elazarl / trie.c

Created January 21, 2012 23:21

A simple and minimal C implementation of trie

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>

	// weird exercise from a friend

	// need to Implement this struct
	typedef struct attrib_t {
	struct attrib_t* bytes[256];
	const char *data;

elazarl / Publishing.java

Created December 20, 2011 18:02

Trying to recreate the "Holder" class publishing error from JCIP.

	/**
	* Trying to recreate the "Holder" class publishing error from JCIP.
	* See http://stackoverflow.com/a/6812936/55094 for the description of the problem.
	*/
	public class Publishing {
	static class Holder {
	int h = 0;
	int dummy = 0;
	public Holder(int h) {
	for (long i=0;i<1000*1000;i++) {

Elazar Leibovich elazarl