[PATCH] - httpd: support for kernel sendfile() call

[Pierre Métras]

Hi,

Here is a small patch to enable the use of the linux kernel function 
sendfile() in the httpd server (the last remaining TODO in network/httpd.c). 
This is enabled by a configuration option, disabled by default.


Without enabling sendfile feature:
$ make bloatcheck
function                                             old     new   delta
sendFile                                             252     247      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-5)               Total: -5 bytes
   text    data     bss     dec     hex filename
  87684    1068   10280   99032   182d8 busybox_old
  87668    1068   10280   99016   182c8 busybox_unstripped

With sendfile feature enabled:
$ make bloatcheck
function                                             old     new   delta
sendFile                                             252     294     +42
.rodata                                             9715    9747     +32
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 74/0)               Total: 74 bytes
   text    data     bss     dec     hex filename
  87684    1068   10280   99032   182d8 busybox_old
  87805    1072   10280   99157   18355 busybox_unstripped

-- Pierre Métras
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