Re: bug report: select on unconnected sockets

From: john slee (indigoid@higherplane.net)
Date: Sat Mar 31 2001 - 12:15:24 EST

  • Next message: Radu Greab: "Re: bug report: select on unconnected sockets"

    On Sat, Mar 31, 2001 at 06:44:20PM +0300, Radu Greab wrote:
    > Sorry if this is already known: on a RH 7.0 system with kernel 2.4.2
    > or 2.4.3, a select on an unconnected socket incorrectly says that the
    > socket is ready for input and output. Of course, reading from the socket
    > file descriptor returns -1 and errno is set to ENOTCONN as shown in
    > the strace output:
    >
    > socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
    > select(4, [3], [3], [3], {0, 0}) = 2 (in [3], out [3], left {0, 0})
    > read(3, 0xbffff668, 1024) = -1 ENOTCONN (Transport endpoint is not connected)
    >
    > I attached a small example program to reproduce the bug.

    bleah. which one is supposed to be right?

    linux 2.4
    ---------
    $ uname -a
    Linux XXXXX 2.4.2-ac20 #8 Wed Mar 14 01:53:05 EST 2001 i686 unknown
    $ ./t
    select result=2
    read: Transport endpoint is not connected

    linux 2.2
    ---------
    $ uname -a
    Linux XXXXX 2.2.18 #1 Thu Dec 21 21:13:10 EST 2000 i586 unknown
    $ ./t
    select result=1

    solaris
    -------
    $ uname -a
    SunOS XXXXX 5.7 Generic_106541-07 sun4m sparc sun4m
    $ ./t
    select result=0 

    -- 
"Bobby, jiggle Grandpa's rat so it looks alive, please" -- gary larson
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