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Explaining Stream Head on I/O Multiplexors

i'm an software engineer at NEC right now I'm studying System V network programming..but i'm currently having a problem on the I/O multiplexors..especially on the stream head can anyone give me a brief description, example and explainatio about the concept of stream head?
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dgrimes

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dgrime,
    mmmmm...i think i got it..well basically..it is just one way of communicating with devices using drivers....i got that from a book..well i guess the only way for me to understand it better is to make one right??..thanx anyway..
If you wanted more information all you had to do was ask! I would have been more than happy to give all that I have. I thought you wanted a brief description. Also, if an answer given is not what you wanted then you should reject it or request clarification.

Most of the information I have and most of I have learned came for one book or another at one time or another.

If you want, I will have the points posted back to you and you can repost the question. I have no problem with doing this.

Let me know

dgrimes
no it's alright..:) i appreciate it..really..that answer was good.btw could i email you??:) maybe exchange of ideas? thanx..
Sure ... my email is dgrimes@scvl.com. BTW, I do have some diagrams in this book and quite a bit more description on streams. But ... SCO has a pretty good documentation set that has all of this and more. It's at www.sco.com and just follow the links. There is a pretty good walk through of the logic complete with flowcharts.

dgrimes