Copy filter: fixed sendfile aio handlers to set ctx->aio. Sendfile handlers (aio preload and thread handler) are called within ctx->output_filter() in ngx_output_chain(), and hence ctx->aio cannot be set directly in ngx_output_chain(). Meanwhile, it must be set to make sure loop within ngx_output_chain() will be properly terminated. There are no known cases that trigger the problem, though in theory something like aio + sub filter (something that needs body in memory, and can also free some memory buffers) + sendfile can result in "task already active" and "second aio post" alerts. The fix is to set ctx->aio in ngx_http_copy_aio_sendfile_preload() and ngx_http_copy_thread_handler(). For consistency, ctx->aio is no longer set explicitly in ngx_output_chain_copy_buf(), as it's now done in ngx_http_copy_thread_handler().

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


NGX_MAKEFILE=$NGX_OBJS/Makefile
NGX_MODULES_C=$NGX_OBJS/ngx_modules.c
NGX_MODULES=

NGX_AUTO_HEADERS_H=$NGX_OBJS/ngx_auto_headers.h
NGX_AUTO_CONFIG_H=$NGX_OBJS/ngx_auto_config.h

NGX_AUTOTEST=$NGX_OBJS/autotest
NGX_AUTOCONF_ERR=$NGX_OBJS/autoconf.err

# STUBs
NGX_ERR=$NGX_OBJS/autoconf.err
MAKEFILE=$NGX_OBJS/Makefile


NGX_PCH=
NGX_USE_PCH=


# check the echo's "-n" option and "\c" capability

if echo "test\c" | grep c >/dev/null; then

    if echo -n test | grep n >/dev/null; then
        ngx_n=
        ngx_c=

    else
        ngx_n=-n
        ngx_c=
    fi

else
    ngx_n=
    ngx_c='\c'
fi


# create Makefile

cat << END > Makefile

default:	build

clean:
	rm -rf Makefile $NGX_OBJS
END