HTTP: on using API sendfile, check EAGAIN
HTTP: on using API sendfile, check EAGAIN

Some plugins may not be too efficient to buffer outgoing data
and when implementing the sendfile callback on some cases it will
need to re-call the routine until the Kernel enqueue the data.

Signed-off-by: Eduardo Silva <81f705dc2ce1a61a2621e0e4b442a9474e1d0c70@monkey.io>

dreamsxin/monkey,dougsko/monkey,sbagmeijer/monkey,sujayraaj/monkey_rtems,WilliamRen/monkey-1,sujayraaj/monkey,WilliamRen/monkey-1,sujayraaj/monkeyTest,monkey/monkey,dreamsxin/monkey,monkey/monkey,WilliamRen/monkey-1,monkey/monkey,dreamsxin/monkey,sujayraaj/monkeyTest,monkey/monkey,dreamsxin/monkey,dougsko/monkey,sujayraaj/monkey_rtems,sujayraaj/monkey,monkey/monkey,sujayraaj/monkey,sbagmeijer/monkey,sujayraaj/monkeyTest,sujayraaj/monkey_rtems,sujayraaj/monkey,sujayraaj/monkey,WilliamRen/monkey-1,monkey/monkey,sbagmeijer/monkey,sujayraaj/monkeyTest,sbagmeijer/monkey,dougsko/monkey,sbagmeijer/monkey,WilliamRen/monkey-1,dreamsxin/monkey,dougsko/monkey,sujayraaj/monkey_rtems,dougsko/monkey,sujayraaj/monkey_rtems