@programminginc - страница 2469

Anonymous

oh

labyrinth

ok thank you

labyrinth

Anonymous

oh

labyrinth

then is there a way to verify that the program did run successfully? for zombie process, there are macros functions that can check with the status code returned by wait_pid. how about just a hello world process that could finish in 1ms?

labyrinth

i think the interview question was geared to linux command rather than coding though

labyrinth

ahh thank you very much

Anonymous

Guys, why do function has always to return something? And, is it the only difference between procedures and function?

Anonymous

Guys, why do function has always to return something? And, is it the only difference between procedures and function?

I mean, what is the benefit of doing a typical "int main ()" and doing a "int main (void)"? Procedure = int main (void)

Tute

Guys, why do function has always to return something? And, is it the only difference between procedures and function?

Yes, a sub-rutine is a function that does not return anything

Tute

I mean, what is the benefit of doing a typical "int main ()" and doing a "int main (void)"? Procedure = int main (void)

main returns the finalize state of your program to your OS

Tute

I mean, what is the benefit of doing a typical "int main ()" and doing a "int main (void)"? Procedure = int main (void)

0 it's ok, anything else is an error code of your preference

Anonymous

But why do the os need it?

Tute

But why do the os need it?

to let it know that your program finish sucssefuly, or inform the user something wrong happend

Anonymous

to let it know that your program finish sucssefuly, or inform the user something wrong happend

So, introducing a (void) won't tell you that the program finished succesfully?

Alex

But why do the os need it?

for example for writing scripts: you call program and depending on the exit status continue script or exit with error message

Tute

So, introducing a (void) won't tell you that the program finished succesfully?

main always return an int (in C++ it's mandatory), in C if you use void main your program will always return 0 to your OS

Anonymous

main always return an int (in C++ it's mandatory), in C if you use void main your program will always return 0 to your OS

Ooooo.... What if you return 1? or any number?

Anonymous

Ooooo.... What if you return 1? or any number?

Will it loop

Tute

Ooooo.... What if you return 1? or any number?

nothing, but your OS will complain that something wrong happend with the program...

Anonymous

nothing, but your OS will complain that something wrong happend with the program...

... Is there a list of errors that os give depending on the return value? Does it depend on the os? Or the compiler?

Alex

... Is there a list of errors that os give depending on the return value? Does it depend on the os? Or the compiler?

depends on OS https://shapeshed.com/unix-exit-codes/

Tute

... Is there a list of errors that os give depending on the return value? Does it depend on the os? Or the compiler?

no, you choose what value to return...

Tute

... Is there a list of errors that os give depending on the return value? Does it depend on the os? Or the compiler?

for example, if you could not open a file you return 2, but if you couldn't open a socket you return 1, to know what happend (it's for developers only, user just see an error prompt if you choose to show it)

Anonymous

for example, if you could not open a file you return 2, but if you couldn't open a socket you return 1, to know what happend (it's for developers only, user just see an error prompt if you choose to show it)

I'm developping my development skills XD

labyrinth

Can anyone recommend a group about computer network?

Tute

I'm developping my development skills XD

Anonymous

on my pc all daemons have systemd as parent though

Anonymous

oh some actually have a user owned systemd, which is a child of the root owned systemd, as the parent. it seems like it isn't about old and new, just who needs what access.

Anonymous

oh by "some old daemons" you meant "some old init daemons"

Anonymous

i thought you were talking about daemons spawned by init and by old daemons (non init) you meant daemons which have not been updated in a while.

Anonymous

😅