Thread: Unix - Checking defaults

  1. #1
    Registered User
    Join Date
    Oct 2005

    Unix - Checking defaults

    How do I check the send buffer size on a Unix system?

    This is probably right in front of me, but I wouldn't know where to look.

  2. #2
    Registered User
    Join Date
    Sep 2004
    look into the getsockopt call and the option SO_SNDBUF layer as SOL_SOCKET and the rest is up to you to figure out.

    I found these in the socket(7) man page, and I also looked at the getsockopt(2) man page but Im still trying to figure some of it out.

    ok, Im not that great with C, C++ is much more my style, but I threw together a simple little C program that checks what the send buffer size is. I didn't do any double checking, so this might be wrong, but might as well give it a shot, here is the code

    #include <sys/socket.h>
    #include <sys/types.h>
    #include <stdio.h>
    int main(void)
            int mysocket,buffsize,length;
            length = sizeof(int);
            mysocket = socket(PF_INET,SOCK_STREAM,6);
            getsockopt(mysocket, SOL_SOCKET,SO_SNDBUF,&buffsize,&length);
            printf("the send buff is %i bytes in size.\n", buffsize);
            return 0;
    I got
    the send buff is 16384 bytes in size.
    for the output.
    Last edited by Xipher; 10-31-2005 at 08:25 PM.
    If any part of my post is incorrect, please correct me.

    This post is not guarantied to be correct, and is not to be taken as a matter of fact, but of opinion or a guess, unless otherwise noted.

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