Re: net.inet.tcp.sendspace

From: Sean Chittenden (sean_at_chittenden.org)
Date: 06/29/04

  • Next message: fabulous: "Re: net.inet.tcp.sendspace" 
    Date: Tue, 29 Jun 2004 10:36:38 -0700
To: fabulous <fabulous@t7ds.com.br>

    > Is there any way to change its value according to the connection's uid
    > or port?

    Not with sysctl(8). You can by hacking the application and adding a
    few setsockopt(2) calls, specifically the SO_RCVBUF and SO_SNDBUF
    options. Here's a sample snippit you could follow:

    /* Add these #includes if they aren't already there */
    #include <err.h>
    #include <sysexits.h>

    /* Add this to the top of the function that calls listen(2) */
    int rcvbuf = 4096;
    int sndbuf = 4096;

    /* And add these calls before the application makes its listen(2) call.
      You may find that some applications are already setting their send and
    receive buffer sizes. */
    if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) != 0)
       err(EX_OSERR, "setsockopt(2) for SO_RCVBUF failed");

    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) != 0)
       err(EX_OSERR, "setsockopt(2) for SO_SNDBUF failed");

    > I need small sendspaces to ircd and bigger ones to apache..

    Add the above to each of the applications before they make their
    listen(2) calls. It's a shame more applications don't let you tweak
    this value via a config file.

    -sc 

    -- 
Sean Chittenden
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  • Next message: fabulous: "Re: net.inet.tcp.sendspace"

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