Pseudo-device driver & select ??

From: Aziz Kezzou (french.linuxian_at_gmail.com)
Date: 05/26/05

  • Next message: Aziz Kezzou: "Re: Pseudo-device driver & select ??" 
    Date: Thu, 26 May 2005 16:38:28 -0400
To: freebsd-hackers <freebsd-hackers@freebsd.org>, freebsd-net <freebsd-net@freebsd.org>

    Hi all,
    I am trying to implement a small kld pseudo-device driver on FreeBSD 5.3 that
    behaves just like a socket with regards to the select system call.

    Currently, I am using the sample echo pseudo-device driver from
    http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/driverbasics-char.html
     as an example. However, whenever I call select on the file
    descriptor of "/dev/echo" it always returns even when there is no data
    to be read.

    I looked at the socket code and it looks like I need to provide my own
    "fo_select" function in the fileops data structure. Am i right ? How
    do I do that ? The sample echo pseudo-device driver above uses
    "struct cdevsw" instead...

    Thanks
    -aziz
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