Baruch Even baruch

baruch / defer.h

Created May 27, 2018 19:09

Defer cleanup for C (gcc and llvm)

	#define DEFER_MERGE(a,b) a##b
	#define DEFER_VARNAME(a) DEFER_MERGE(defer_scopevar_, a)
	#define DEFER_FUNCNAME(a) DEFER_MERGE(defer_scopefunc_, a)
	#define DEFER(BLOCK) void DEFER_FUNCNAME(__LINE__)(int *a) BLOCK; __attribute__((cleanup(DEFER_FUNCNAME(__LINE__)))) int DEFER_VARNAME(__LINE__)

	// Usage:
	/*
	void dosomething()
	{
	char* data = malloc(100);

baruch / scsi_sense.stp

Last active April 21, 2018 20:12

Get SCSI Sense buffers in Linux with systemtap

	probe module("scsi_mod").function("scsi_command_normalize_sense") {
	printf("CDB:");
	for (i = 0; i < $cmd->cmd_len; i++) {
	printf(" %02X", $cmd->cmnd[i]);
	}
	printf(" \| SENSE:");
	for (i = 0; i < 32; i++) {
	printf(" %02X", $cmd->sense_buffer[i]);
	}
	printf("\n");

baruch / pi-nrf24le1.sh

Last active April 28, 2022 12:11

Setup Raspberry Pi for nRF24LE1 development

	# Install sdcc to build nRF24LE1 code
	# Install python-dev and python-setuptools to build python code for hacking
	# Install minicom for UART communication
	# Install screen to avoid network disconnect interruptions
	sudo apt-get update && sudo apt-get install sdcc python-dev python-setuptools minicom screen
	sudo apt-get dist-upgrade

	# Install bcm2835 library
	wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.38.tar.gz && tar xvf bcm2835/bcm2835-1.38.tar.gz && cd bcm2835-1.38 && ./configure && make && sudo make install
	cd ~

baruch / gist:106a3da12187b284830e

Created July 20, 2014 06:12

Optimal tar compression

find $d -type f | rev | sort | rev | tar -c -T /dev/stdin -f - | pv -pterb -B 10m -s $(du -ms $d | cut -f1)m -W -i 10 | bzip2 -6 > $d.tar.bz2;

baruch / scsi_sense.stp

Created May 15, 2014 19:08

Get full SCSI Sense out of any command failure

	probe module("scsi_mod").function("scsi_command_normalize_sense") {
	printf("CDB:");
	for (i = 0; i < $cmd->cmd_len; i++) {
	printf(" %02X", $cmd->cmnd[i]);
	}
	printf(" \| SENSE:");
	for (i = 0; i < 32; i++) {
	printf(" %02X", $cmd->sense_buffer[i]);
	}
	printf("\n");

baruch / gist:8584442

Created January 23, 2014 18:47

ReQL: For a field get in one query the count, min, max and sample entries

	r.db('mydb').table('disk').withFields('glist').groupedMapReduce(
	function(x) { return x },
	function(x) { return 1 },
	function(x,y) { return 1 }
	)
	.map(function (x) { return x('group')('glist') })
	.reduce(function(x,y) { return
	{
	count: x('count').add(1),
	val: x('val').union([y]).sample(10),

baruch / libev_async_dns.c

Created May 5, 2013 19:02

Asynchronous dns resolving with libev and the gethostbyname_r function.