Dpontes11

hi

i've been using knoppix for a few weeks because of a class at the university. this class is basically learning how to create processes in linux using C language.

the problem i'm having is the following:

im tying to use the named pipes, known as FIFO's. the thing is, when i try to create a normal unnamed pipe, it creates it and works without any problem. however, when i want to create a FIFO, it doesn't create it.

it's not a instructional error, as i've shown this problem to my teacher.

he said it might be because simply knoppix doesn't give me permitions to create this FIFO.

any sugestions on what I should do, if in fact there is something i can do?

thanx

lakerdonald

How are you creating this FIFO? What is the exact mkfifo invocation you're using?

__________________
the lost art of found sound

Dpontes11

sorry about the delay... no internet acess for the last few days!

the code i'm using is:
when testing this last line, it returns (-1), which means that the creation on the FIFO failed.

anyway, i hope this brings new light to someone who might be able to help me out...

thanx

lakerdonald

Okay, include <errno.h> and <stdio.h>, then add:
after the mknod() so that you can see what the exact error was.

__________________
the lost art of found sound

Dpontes11

Ok, i'll do that.

I've been told by a friend that Knoppix really doesn't allow the creation of FIFO's, but still there could be a way...

thanks

Dpontes11

Ok, so this is what came up:

a bit generalistic, i guess...

Maybe knoppix really doens allow the creation of FIFO's.

lakerdonald

Are you root at the time?

__________________
the lost art of found sound

Dpontes11

yes,i am... any suggestions yet, or are you as lost as me?

lakerdonald

Well according to , "Operation not Permitted" is associated with EPERM. According to mknod(2):
What kind of filesystem are you trying this on?

__________________
the lost art of found sound