mohan43u

+static void mkdirpath(const char *path, mode_t mode) {
+       char *d = NULL;
+       char *i = NULL;
+
+       if(path == NULL) return;
+       d = strdup(path);
+       i = d;
+       while(i != NULL) {
+               if( *i == '/') i++;
+               i = strchr(i, '/');

mohan43u

/* compile: gcc -pthread -o spmc spmc.c */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include <signal.h>

mohan43u

unback

gzip -dc boot/berryboot.img | sudo cpio -iuvdm -D berryboot

repack

(C="${PWD}"; cd berryboot; sudo find . | sudo cpio -ov --format=newc | gzip -9 >"${C}"/berryboot.img)

mohan43u

2020-07-10 17:00:20	+mohan43u-we	good evening all
2020-07-10 17:00:37	+mohan43u-we	welcome to Day 5 of 'sh' Posix shell Session
2020-07-10 17:01:17	+mohan43u-we	I hope all of you who joined #ilugc through webchat followed https://pasteboard.co/JgGXsrf.gif link to disable join/part messages
2020-07-10 17:02:10	+mohan43u-we	yesterday we saw variables, if-elif, case, for, while control structures
2020-07-10 17:02:42	+mohan43u-we	also we saw how variable get expanded by shell before executing command, different types of variable expansion
2020-07-10 17:02:55	+mohan43u-we	we also saw arithmetic expansion, command substitution
2020-07-10 17:03:23	+mohan43u-we	we also looked into special built-in variables shell provides like $$, $!, $? etc.,
2020-07-10 17:04:10	+mohan43u-we	today, we will look into functions, positional parameters
2020-07-10 17:04:15	+mohan43u-we	let see function
2020-07-10 17:04:46	+mohan43u-we	a function in shell is nothing but another built-in command which you write, instead of shell providing 

mohan43u

2020-07-09 16:58:39	+mohan43u-we	#ilugc channel is now in restricted mode
2020-07-09 16:59:51	+mohan43u-we	type '/msg mohan43u-we message' if you want to say something important
2020-07-09 17:00:46	+mohan43u-we	good evening to all
2020-07-09 17:01:06	+mohan43u-we	welcome to Day 4 of sh Posix shell session
2020-07-09 17:01:46	+mohan43u-we	we will continue from where we left yesterday
2020-07-09 17:02:09	+mohan43u-we	just a rewind, yesterday we looked into redirection, pipes, normal and environment variables
2020-07-09 17:03:10	+mohan43u-we	our next topic is control structures, like 'if' elif etc.,
2020-07-09 17:04:08	+mohan43u-we	before going into the topic, just want to let you guys how to disable that joined/left messages in the irc chat
2020-07-09 17:05:00	+mohan43u-we	if you are joining #ilugc through webchat.freenode.net, follow https://pasteboard.co/JgGXsrf.gif this link to disable join/part messages
2020-07-09 17:05:09	+mohan43u-we	now, coming to the topic

mohan43u

2020-07-08 16:58:48	+mohan43u-we	good evening to all
2020-07-08 16:58:58	+mohan43u-we	welcome to day 3 of 'sh' Posix Shell session
2020-07-08 16:59:27	+mohan43u-we	before we begin, if you are using 'webchat.freenode.net' you can hide join/part messages
2020-07-08 16:59:41	+mohan43u-we	the instruction is provided in the 'training.ilugc.in' page
2020-07-08 16:59:58	+mohan43u-we	also we have a new practice server. IP address got changed
2020-07-08 17:00:17	+mohan43u-we	so make sure you login to the correct server to practice
2020-07-08 17:00:29	+mohan43u-we	without further delay, lets start
2020-07-08 17:01:18	+mohan43u-we	yesterday we learnt  about man command, manual pages and howto execute more than one command with ';', '&&' and '||'combination
2020-07-08 17:01:28	+mohan43u-we	today, we will start with redirection
2020-07-08 17:02:02	+mohan43u-we	as I explained earlier, a command have "--options", "[args]' arguments, as well as it give returncode when it exits

mohan43u

2020-07-07 16:51:06	+mohan43u-we	hi, channel switched into restricted mode
2020-07-07 16:52:14	@mohan43u	only people who have voice mode enabled can speak
2020-07-07 16:59:41	+mohan43u-we	good evening all
2020-07-07 16:59:56	+mohan43u-we	welcome to day 2 of 'sh' Posix shell session
2020-07-07 17:00:21	+mohan43u-we	today we will be covering the topics which I'm showing in the Presenter Terminal now
2020-07-07 17:01:02	+mohan43u-we	I hope all of you will be able to see the presenter terminal
2020-07-07 17:01:36	+mohan43u-we	lets begin
2020-07-07 17:01:52	+mohan43u-we	lets talk about man pages
2020-07-07 17:02:55	+mohan43u-we	yesterday we saw simple unix commands like 'ls'
2020-07-07 17:02:58	+mohan43u-we	'cd'

mohan43u

2020-07-06 17:40:11	+mohan43u-we	the first thing you do in a shell is to see where you are
2020-07-06 17:40:50	@mohan43u	type pwd command to see in which place you are currently present.
2020-07-06 17:41:37	+mohan43u-we	the path /home/trainer is the current working directory
2020-07-06 17:41:54	+mohan43u-we	in unix, everything is a file
2020-07-06 17:42:07	+mohan43u-we	a directory is also a file
2020-07-06 17:42:35	+mohan43u-we	a file in unix is stored in one particular tree
2020-07-06 17:42:56	+mohan43u-we	unix filesytem starts from root
2020-07-06 17:43:40	+mohan43u-we	as you see in the presenter terminal, 'ls /' command will show the directories inside the root
2020-07-06 17:43:51	+mohan43u-we	the command 'ls' means list
2020-07-06 17:44:19	+mohan43u-we	here '/' represents the root of the file system

mohan43u

Testing openat2 in systemd-nspawn

Test code

/* openat2_test.c */
/* compile: gcc -O0 -g -static -o openat2_test openat2_test.c */
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

mohan43u

2020-06-16 16:00:17	mohan43u-we	welcome to ILUGC #irc channel
2020-06-16 16:01:14	mohan43u-we	wait for another 5 more mins for people to join
2020-06-16 16:01:46	mohan43u-we	I hope everyone can see the presenter terminal
2020-06-16 16:03:09	-->	mohan43u-kiwi (~mohan43u-@2a01:4f9:c010:82aa::1) has joined #ilugc
2020-06-16 16:03:43	stof9-9	link please
2020-06-16 16:04:00	mohan43u-we	stof9-9: https://training.ilugc.in
2020-06-16 16:04:09	stof9-9	thanks
2020-06-16 16:04:32	-->	famubu__1 (~famubu@117.207.224.45) has joined #ilugc
2020-06-16 16:04:57	mohan43u-we	lets start the talk
2020-06-16 16:05:23	mohan43u-we	this talk is about 'ed' the text editor