eerpini’s gists

eerpini / bazelrc

Created August 3, 2019 08:52

--sandbox_writable_path=/home/$USER/.ccache

eerpini / sandbox_ccache_crash.txt

Created August 3, 2019 08:45

	Use --sandbox_debug to see verbose messages from the sandbox
	ccache: error: Failed to create temporary file for /home/satish/.ccache/tmp/trees.stdout: Read-only file system

eerpini / blog_dir_vis_networkx.py

Last active August 29, 2015 14:15

	#!/bin/python
	# except for the top level directory we ignore
	# hidden files and directories by default
	# arg1 : directory arg2 : outputfile.png

	import sys
	import os
	import os.path
	import networkx as nx
	import matplotlib.pyplot as plt

eerpini / blog_shared_memory_mmap.c

Last active August 29, 2015 14:15

Simple shared memory example using mmap

	/*
	* get the definition of MAP_ANONYMOUS
	*/
	#define _BSD_SOURCE
	#include <stdio.h>
	#include <sys/mman.h>
	#include <stdlib.h>
	#include <sys/wait.h>
	#include <unistd.h>
	#include <string.h>

eerpini / blog_get_file_system_fragmentation.c

Created February 18, 2015 22:07

	int main (int argc, char **argv)
	{
	int fd, i, block, blocksize, bcount, prev_block, frag_count=0;
	struct stat st;
	assert (argv[1] != NULL);
	assert (fd = open (argv[1], O_RDONLY));
	assert (ioctl (fd, FIGETBSZ, &blocksize) == 0);
	assert (!fstat (fd, &st));
	bcount = (st.st_size + blocksize - 1) / blocksize;
	printf ("File: %s Size: %d Blocks: %d Blocksize: %d\n",

eerpini / blog_print_strings.c

Created February 18, 2015 21:56


	int * string_indices= break_by_spaces("A String of words");

	for(i=0; *(string_indices + i) != -1; i++){
	fprintf(stdout, "[%d] %d %s \n", i, (string_indices + i), (char )(argv[1] + *(string_indices + i)));
	}

eerpini / split_spaced_string.c

Last active August 29, 2015 14:15

Split a string with spaces into null terminated strings.

	int * break_by_spaces(char * arg){
	if(strlen(arg) <= 0 \|\| (strlen(arg) ==1 && *arg == ' ')){
	return NULL;
	}
	int * retval = malloc((strlen(arg) -1)*sizeof(int));
	int * temp = retval;
	int counter = 0;
	if(retval == NULL){
	perror("malloc");
	exit(EXIT_FAILURE);

eerpini / numa-memory-at-each-node.c

Created February 18, 2015 21:53

Get the memory at each node in a NUMA system.

eerpini / read-utmp-file.c

Last active February 19, 2020 19:02

sample code to read the unix session log utmp

	#include <utmpx.h>
	#include <paths.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	int main(int argc, char **argv){
	struct utmpx data;
	FILE *log_file = fopen(_PATH_UTMP, "r");
	memset(&data, 0, sizeof(struct utmpx));

eerpini / struct-utmpx.c

Last active August 29, 2015 14:15

The structure definition for the session log entry

	/* The structure describing an entry in the user accounting database. */
	struct utmpx
	{
	short int ut_type; /* Type of login. */
	__pid_t ut_pid; /* Process ID of login process. */
	char ut_line[__UT_LINESIZE]; /* Devicename. */
	char ut_id[4]; /* Inittab ID. */
	char ut_user[__UT_NAMESIZE]; /* Username. */
	char ut_host[__UT_HOSTSIZE]; /* Hostname for remote login. */
	struct __exit_status ut_exit; /* Exit status of a process marked as DEAD_PROCESS. */

Satish Eerpini eerpini