From: ara.t.howard@...
Date: 2006-03-24T12:24:01+09:00
Subject: Re: [ANN] socket_sendfile

On Fri, 24 Mar 2006, Eric Hodel wrote:

> = socket_sendfile
>
> Rubyforge Project:
>
> http://rubyforge.org/projects/rctools/
>
> Documentation:
>
> http://dev.robotcoop.com/Libraries/socket_sendfile/
>
> == About
>
> Socket#sendfile implements sendfile(2) for sending files without copying data
> to the process.  See the sendfile(2) manual page for more details.
>
> Note that your system must support the sendfile(2) system call the same way
> FreeBSD does for Socket#sendfile to work.
>
> == Installing socket_sendfile
>
> First you need an OS that supports sendfile() the way FreeBSD does.
>
> Then install the gem:
>
>  $ sudo gem install socket_sendfile
>
> == Using socket_sendfile
>
>  require 'rubygems'
>  require 'socket'
>  require 'socket_sendfile'
>
>  socket = TCPSocket.open host, port
>
>  File.open 'myfile' do |fp|
>    socket.sendfile fp
>  end

i'm just about to write a server which sends 1-3gb images as the response...
this could be quite useful.

one gripe.  it doesn't work:

   /home/ahoward is insecure (40777), needs 0700 for perms. Exiting

i work in a collaborative lab... all our home dirs are group readable by
default.  any way to adjust this?  an env var perhaps?  seems like this should
just warn.


ok.  one more issue:

     fortytwo :~/tmp > ruby ../a.rb
     /usr/local/ruby-1.8.4/lib/ruby/gems/1.8/gems/RubyInline-3.4.0/./inline.rb:392: warning: Insecure world writable dir /usr/local, mode 040777
     /usr/local/ruby-1.8.4/lib/ruby/gems/1.8/gems/socket_sendfile-1.1.0/lib/socket_sendfile.rb: In function `bsock_sendfile':
     /usr/local/ruby-1.8.4/lib/ruby/gems/1.8/gems/socket_sendfile-1.1.0/lib/socket_sendfile.rb:46: warning: implicit declaration of function `sendfil
     e'
     /usr/local/ruby-1.8.4/lib/ruby/gems/1.8/gems/RubyInline-3.4.0/./inline.rb:396:in `build': error executing gcc -shared -Wall -W -Wpointer-arith -
     Wcast-qual -Wcast-align -Wwrite-strings -Wmissing-noreturn -Werror -g -O2 -I /usr/local/ruby-1.8.4/lib/ruby/1.8/i686-linux -o /home/ahoward/.rub
     y_inline/Inline_BasicSocket_0a2b.so /home/ahoward/.ruby_inline/Inline_BasicSocket_0a2b.c : 256 (CompilationError)
     Renamed /home/ahoward/.ruby_inline/Inline_BasicSocket_0a2b.c to /home/ahoward/.ruby_inline/Inline_BasicSocket_0a2b.c.bad        from /usr/local/
     ruby-1.8.4/lib/ruby/gems/1.8/gems/RubyInline-3.4.0/./inline.rb:591:in `inline'
             from /usr/local/ruby-1.8.4/lib/ruby/gems/1.8/gems/socket_sendfile-1.1.0/lib/socket_sendfile.rb:6
             from /usr/local/ruby-1.8.4/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
             from ../a.rb:3


my system definitely has sendfile


     fortytwo :~/tmp > PAGER=cat man sendfile|head -12
     SENDFILE(2)               Linux Programmer's Manual               SENDFILE(2)



     NAME
            sendfile - transfer data between file descriptors

     SYNOPSIS
            #include <sys/sendfile.h>

            ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count);


guess the signature won't cut it though eh?  maybe i'll just have to use dl?

regards.

-a
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