Message Queue - IPC Mechanism

[@bestfoodvines9605]

it is really practical and useful for showing the process of message queue

[@ShriramVasudevan]

Thanks and glad u liked

[@techlearner6335]

One of the best! I have searched for many, but this is the best! Hats off!

[@amina1558]

++++

[@greymind0072]

That's really amazing and one of the best lucid explanation and code walk through i ever seen on youtube for linux system programming. Your way to teaching is really amazing. Please Add the youtube tags for more reach and will help the youtube channel to grow. Thanks and best wishes for channel

[@ShriramVasudevan]

Thanks bro. This is very encouraging

[@RobertStineIsTheBest]

Bro, despite the fact that I was having pretty tough time understanding your accent (I am not a native English speaker either), your video helped me a ton. Thank you very much for the video !

[@ShriramVasudevan]

Thanks Bro and yea accent is a problem when the country gets different bro. :)

[@memorylanezz]

Thanks for the video. Very useful and straight forward by showing the code step by step. Thank you.

[@ShriramVasudevan]

Thanks and glad you liked it

[@vajjasunilkumar3947]

Hello sir, your explanation is very clear for basic level. But my question is like if use this message quie along with multi threading various threads try need to get access to same message quie on that moment I can do all the procedure for every thread how to manage at that instance. I'm I know my question is a bit crazy but in real world this happens...

[@sunandhinim6083]

This is the best! Clear, Concise, Elegant!

[@sukanya3634]

wow...very clear explanation..

[@ShriramVasudevan]

Thanks n glad you liked it

[@a.t.venkateswarareddy]

very good content on message queues . thank you

[@AbdulQadir-el4ql]

well teaching sir....

[@ShriramVasudevan]

Thank you very much

[@AbdulQadir-el4ql]

@@ShriramVasudevan sir please make lecture on socket programming and mutex

[@ShriramVasudevan]

@@AbdulQadir-el4ql both done..pl check bro.

[@AbdulQadir-el4ql]

@@ShriramVasudevan OK , I will check it ..thanks sir

[@ShriramVasudevan]

@@AbdulQadir-el4ql thanks bro.

[@profdurgahere9007]

very good content on message queues

[@divyas7516]

Hi Bro. I tried the programs. But facing an issue, that receiver program gets a different messageId and seems due to which messages are not received. Can u please help

[@divyas7516]

Same works fine if I don't check the return of any of the calls. Also it works fine if there is no file exist for the pah mentione in ftok(path , 65)

[@ShriramVasudevan]

Ftok can be done with any file but.. give appropriate path. Else it won work. Or.. give key value and try

[@MSNarassima]

Logically explained

[@imtiyazaaresh9175]

thank you it's very useful to me

[@ShriramVasudevan]

Thanks! :)

[@arvindg553]

100% clear

[@ShriramVasudevan]

Thanks

[@technologyexcitesme8829]

very useful sir.

[@geethurohith]

Helped alott thnq 😊

[@ShriramVasudevan]

Glad u liked.

[@avishekdutta1901]

Sir plzz make more videos on this topic or suggest some sources with examples

[@ShriramVasudevan]

Kindly check the playlist linux system programming. You will find a lot.

[@narasimhareddymv748]

Simply well said

[@nareshpothula3966]

Shriram, in the msgsend file to generate a key you used 3_msgsnd.c as 1st argument to ftok(); in the msgrcv file to generate a key you used msgsnd.c as 1st argument to ftok(); If that file is open successfully then key will be generated differently. if key is different how your message is delivered to another end ??

[@darpanpatel2440]

in this example , msgsend.c file you used 3_msgsend.c for a key (it can be any file ) and same file should be receiver end for validity purpose , but in msgrcv.c there is msgsnd.c file you have used ,

[@ShriramVasudevan]

Key must be through the same file.. I mentioned it.. may be i could have recorded it later and edited.

[@darpanpatel2440]

@@ShriramVasudevan ok No problem ,that's why i was confused :) , by the way all videos are superb ✌

[@ShriramVasudevan]

@@darpanpatel2440 thanks bro.

[@msaravanaselvam128]

Is this code work on codeblocks?

[@bezayitmeles197]

beautiful

[@ShriramVasudevan]

@Bezayit Meles, Thank you and happy to know that you liked this!

[@mekings0422]

wonderful.. thanks very much. sir can you please post links to the codes you used here

[@ed_conansayshi3464]

helped a lot, thanks bro

[@ShriramVasudevan]

Thanks bro. Good you liked.

[@pranjalbankar8871]

Thanks sir, I have one doubt, I kept the msg size 20 instead of 200 But still the program is not terminating What's the reason behind it

[@ShriramVasudevan]

Buffer initiation error it could be

[@pranjalbankar8871]

@@ShriramVasudevan ohk sir thank you😇

[@ShriramVasudevan]

@@pranjalbankar8871 welcome..hope the content was useful

[@bobbyisk]

Very good explanation sir :) btw can i get the whole code of sending and receiving for the better understanding? Thank you very much

[@ShriramVasudevan]

I have authored a book and blogs are there as well. But.. I wish you refer man page to learn. . if you need any help let me know

[@vardhansanka4779]

What is the difference between the two files 3_msgsnd and msgsnd sir? Just asking my doubt.

[@ShriramVasudevan]

Both are same..i did the naming different. Nothing beyond :)

[@vardhansanka4779]

@@ShriramVasudevan Thanks for a fast reply sir. Can I know why you have used 3_msgsnd in msgsnd and only msgsnd in msgrcv program to generate a key. I am having a doubt that if two different files are used can we get the interprocess communication mechanism right or wrong ?

[@ShriramVasudevan]

@@vardhansanka4779 key should be with the same file only. So, don't get confused..both sender and receiver must share the same key..

[@ShriramVasudevan]

@@vardhansanka4779it's my pleasure helping you. :)

[@vardhansanka4779]

@@ShriramVasudevan sir, what that 0 in msgsnd(step-3) and 1,0 is msgrcv(step-3)meant for? Are they used for standard input and standard output purpose or anything else?

[@prashanthkumar4222]

nice one

[@ShriramVasudevan]

Thank you. Good you liked it.

[@seshadrinm418]

Nice one!!

[@bkissa12]

Please send the code in description too

[@venkatsubbu2802]

Tnqqqqq sir make a video on file locks

[@chsaiman0j961]

where did u specify the receiver (who has to receive the sent message) in sender code? I'm sry if I'm asking u a wrong question, but I got this doubt.

[@ShriramVasudevan]

Hi.. we need not specify explicitly. they share the same key and that's sufficient. Also.. you see the place where write and where we read.

[@ShriramVasudevan]

And ...no question is silly. :)

[@garimagupta2289]

could you please tell any real life example where message queues are used? Thanks :)

[@ShriramVasudevan]

Hello Garima.. it starts from the simple chat application you Develop. It can be used to send the messages in appropriate order.

[@bhargavtupakula9896]

please paste the code in description.

[@ShriramVasudevan]

It's long code. You can take it from git. @shriramkv

[@iamtechieforever678]

Useful, elegant!

[@vaishnavamaruthi5081]

thanku for very usefull

[@mohitjoshi7722]

Tutorial is really awesome.Can you please share file links…

[@ShriramVasudevan]

Glad you liked. Shall share the link soon

[@stiliyangoranov3015]

thanks a lot!

[@ShriramVasudevan]

Thanks and good you liked.

[@neetabisht7271]

Hi, could you please tell from where 3_msgrcv.c file came ?

[@ShriramVasudevan]

That's just the file name..

[@manjunathg8240]

Sir please can you make a video on IPC DBUS. Create a client and server process, build the interface using fidl file. Try to communicate between client and server.

[@ShriramVasudevan]

That's a cool suggestion. Install do that for sure. Give me some time.

[@manjunathg8240]

@@ShriramVasudevan Thank you sir. I will be waiting.. I asked for this coz now it's the most commonly used IPC especially for Infotainment domain. Which will be very helpful.

[@alphaman3765]

Sir,can you pls put the code in GitHub and post in the description

[@ShriramVasudevan]

@shriramkv .. check in GIT

[@eduardoalmeida8158]

how can i do for the send to also receive and the receiver to also send just like and chat application /*its a work for college and im tottaly stuck please help :(*/

[@alexandrahancu1231]

you should use 2 message queues a=>b a

[@killerthoughts6150]

Very neat sir !

[@wasimakram5371]

Where I can get the file used in explanation ?

[@rgriff29]

See Chapter 45&46 from TLPI - Download the source code from TLPI www.man7.org/tlpi/code/index.html

[@hanhpham-pl8yd]

please given link full project. !

[@sakwiley19]

Elegance!

[@revathsaikiran6248]

Sir I got an error in msgid isn't what is the problem

[@ShriramVasudevan]

revath revath I need to know what is the error.. send me screen shot.

[@yogeshasati6892]

thankyou...

[@mergimuka6775]

When I execute "./snd and ./rcv" it says: key: No such file or directory

[@ShriramVasudevan]

Mërgim Uka did you compile the file with gcc -o msgsnd filename.c

[@mergimuka6775]

Yes I did, but I am stucked on it. P.s I am beginner in Linux (Ubuntu)

[@ShriramVasudevan]

I shall send u guidelines .. give me time

[@mergimuka6775]

Sure Shriram. Thanks for this awesome tutorial.

[@ShriramVasudevan]

You need to the following steps: 1. Compile the file 1. gcc -o snd msgsnd.c 2. Compile the file 2 gcc -o rcv msgrcv.c 3. Open a new terminal. Go the path where you have stored the files. 4. Open another terminal as well with same path. 5. In terminal one do ./snd 6. in terminal 2 do ./rcv 7. It should work. if not let me know.

[@vinuVA]

There's a huge bug on this program.. the msgid generated here shouldn't be equal = 0 , and also this process never ends as both loops for send and receive are indefinite.and also the queue is not cleared up anytime soon because of this loop. try this code instead: //msgsnd() program: int main() { int count =0; int msgid; int sndid; char w[4] = "EXIT"; //to exit the send operation anytime struct msgbuff{ long settype; char msgtxt[50]; }; struct msgbuff msg; //setting type msg.settype = 2; //MSG ID creation if((msgid = msgget((key_t)1253,0644|IPC_CREAT))==-1) //the IPC_CREAT should used only once. { perror("\KEY or MSGID NOT GENERATED "); return 0; } printf(" The msgid [SEND] : [%d] ",msgid); //THE RETURN VALUE OF MSGID SHOULDN'T BE

[@rahulreddy9934]

11:41 Thank you fork()s

[@ShriramVasudevan]

:)

[@marathisahityaparishad2446]

It needs magnifier.

[@ShriramVasudevan]

Codes :)

[@atiqshaikh7245]

nice tutorial sir sir,can u plz share source code thank you

[@mittalkrishna987]

please attach the files

[@abdulrehmankaimkhani9892]

can you plz share code..?

[@arshianozary4488]

would you send me the codes?

[@embeddedsystems1051]

upload code also

[@haneenqurt8270]

i want the codes plz :'(

[@ShriramVasudevan]

Haneen Qurt email.id ?

[@haneenqurt8270]

[e-mail]

[@rajatjaiswal2159]

Me too ID is [e-mail]

[@pavanshinde8154]

[e-mail]

[@rohitkishore12]

[e-mail]

[@Someone_artist]

indentation nam ki cheez hoti hai

[@rgriff29]

Very good sir. Definitive examples in Chapter 45/46 of TLPI - download from www.man7.org/tlpi/code/index.html or view online.

[@GAMEVUEG]

Your accent is way too strong