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Fixed request termination with AIO and subrequests (ticket #2555). When a request was terminated due to an error via ngx_http_terminate_request() while an AIO operation was running in a subrequest, various issues were observed. This happened because ngx_http_request_finalizer() was only set in the subrequest where ngx_http_terminate_request() was called, but not in the subrequest where the AIO operation was running. After completion of the AIO operation normal processing of the subrequest was resumed, leading to issues. In particular, in case of the upstream module, termination of the request called upstream cleanup, which closed the upstream connection. Attempts to further work with the upstream connection after AIO operation completion resulted in segfaults in ngx_ssl_recv(), "readv() failed (9: Bad file descriptor) while reading upstream" errors, or socket leaks. In ticket #2555, issues were observed with the following configuration with cache background update (with thread writing instrumented to introduce a delay, when a client closes the connection during an update): location = /background-and-aio-write { proxy_pass ... proxy_cache one; proxy_cache_valid 200 1s; proxy_cache_background_update on; proxy_cache_use_stale updating; aio threads; aio_write on; limit_rate 1000; } Similarly, the same issue can be seen with SSI, and can be caused by errors in subrequests, such as in the following configuration (where "/proxy" uses AIO, and "/sleep" returns 444 after some delay, causing request termination): location = /ssi-active-boom { ssi on; ssi_types *; return 200 ' <!--#include virtual="/proxy" --> <!--#include virtual="/sleep" --> '; limit_rate 1000; } Or the same with both AIO operation and the error in non-active subrequests (which needs slightly different handling, see below): location = /ssi-non-active-boom { ssi on; ssi_types *; return 200 ' <!--#include virtual="/static" --> <!--#include virtual="/proxy" --> <!--#include virtual="/sleep" --> '; limit_rate 1000; } Similarly, issues can be observed with just static files. However, with static files potential impact is limited due to timeout safeguards in ngx_http_writer(), and the fact that c->error is set during request termination. In a simple configuration with an AIO operation in the active subrequest, such as in the following configuration, the connection is closed right after completion of the AIO operation anyway, since ngx_http_writer() tries to write to the connection and fails due to c->error set: location = /ssi-active-static-boom { ssi on; ssi_types *; return 200 ' <!--#include virtual="/static-aio" --> <!--#include virtual="/sleep" --> '; limit_rate 1000; } In the following configuration, with an AIO operation in a non-active subrequest, the connection is closed only after send_timeout expires: location = /ssi-non-active-static-boom { ssi on; ssi_types *; return 200 ' <!--#include virtual="/static" --> <!--#include virtual="/static-aio" --> <!--#include virtual="/sleep" --> '; limit_rate 1000; } Fix is to introduce r->main->terminated flag, which is to be checked by AIO event handlers when the r->main->blocked counter is decremented. When the flag is set, handlers are expected to wake up the connection instead of the subrequest (which might be already cleaned up). Additionally, now ngx_http_request_finalizer() is always set in the active subrequest, so waking up the connection properly finalizes the request even if termination happened in a non-active subrequest.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 30 Jan 2024 03:20:05 +0300
parents be269f1fc230
children
line wrap: on
line source


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


echo "creating $NGX_MAKEFILE"

mkdir -p $NGX_OBJS/src/core $NGX_OBJS/src/event $NGX_OBJS/src/event/modules \
         $NGX_OBJS/src/event/quic \
         $NGX_OBJS/src/os/unix $NGX_OBJS/src/os/win32 \
         $NGX_OBJS/src/http $NGX_OBJS/src/http/v2 $NGX_OBJS/src/http/v3 \
         $NGX_OBJS/src/http/modules $NGX_OBJS/src/http/modules/perl \
         $NGX_OBJS/src/mail \
         $NGX_OBJS/src/stream \
         $NGX_OBJS/src/misc


ngx_objs_dir=$NGX_OBJS$ngx_regex_dirsep
ngx_use_pch=`echo $NGX_USE_PCH | sed -e "s/\//$ngx_regex_dirsep/g"`


cat << END                                                     > $NGX_MAKEFILE

CC =	$CC
CFLAGS = $CFLAGS
CPP =	$CPP
LINK =	$LINK

END


if test -n "$NGX_PERL_CFLAGS"; then
    echo NGX_PERL_CFLAGS = $NGX_PERL_CFLAGS                   >> $NGX_MAKEFILE
    echo NGX_PM_CFLAGS = $NGX_PM_CFLAGS                       >> $NGX_MAKEFILE
    echo NGX_PM_LDFLAGS = $NGX_PM_LDFLAGS                     >> $NGX_MAKEFILE
fi


# ALL_INCS, required by the addons and by OpenWatcom C precompiled headers

ngx_incs=`echo $CORE_INCS $NGX_OBJS $HTTP_INCS $MAIL_INCS $STREAM_INCS\
    | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont$ngx_include_opt\1/g" \
          -e "s/\//$ngx_regex_dirsep/g"`

cat << END                                                    >> $NGX_MAKEFILE

ALL_INCS = $ngx_include_opt$ngx_incs

END


ngx_all_srcs="$CORE_SRCS"


# the core dependencies and include paths

ngx_deps=`echo $CORE_DEPS $NGX_AUTO_CONFIG_H $NGX_PCH \
    | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
          -e "s/\//$ngx_regex_dirsep/g"`

ngx_incs=`echo $CORE_INCS $NGX_OBJS \
    | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont$ngx_include_opt\1/g" \
          -e "s/\//$ngx_regex_dirsep/g"`

cat << END                                                    >> $NGX_MAKEFILE

CORE_DEPS = $ngx_deps


CORE_INCS = $ngx_include_opt$ngx_incs

END


# the http dependencies and include paths

if [ $HTTP = YES ]; then

    ngx_all_srcs="$ngx_all_srcs $HTTP_SRCS"

    ngx_deps=`echo $HTTP_DEPS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    ngx_incs=`echo $HTTP_INCS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont$ngx_include_opt\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    cat << END                                                >> $NGX_MAKEFILE

HTTP_DEPS = $ngx_deps


HTTP_INCS = $ngx_include_opt$ngx_incs

END

fi


# the mail dependencies and include paths

if [ $MAIL != NO ]; then

    if [ $MAIL = YES ]; then
        ngx_all_srcs="$ngx_all_srcs $MAIL_SRCS"
    fi

    ngx_deps=`echo $MAIL_DEPS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    ngx_incs=`echo $MAIL_INCS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont$ngx_include_opt\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    cat << END                                                >> $NGX_MAKEFILE

MAIL_DEPS = $ngx_deps


MAIL_INCS = $ngx_include_opt$ngx_incs

END

fi


# the stream dependencies and include paths

if [ $STREAM != NO ]; then

    if [ $STREAM = YES ]; then
        ngx_all_srcs="$ngx_all_srcs $STREAM_SRCS"
    fi

    ngx_deps=`echo $STREAM_DEPS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    ngx_incs=`echo $STREAM_INCS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont$ngx_include_opt\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    cat << END                                                >> $NGX_MAKEFILE

STREAM_DEPS = $ngx_deps


STREAM_INCS = $ngx_include_opt$ngx_incs

END

fi


ngx_all_srcs="$ngx_all_srcs $MISC_SRCS"


if test -n "$NGX_ADDON_SRCS$DYNAMIC_MODULES"; then

cat << END                                                >> $NGX_MAKEFILE

ADDON_DEPS = \$(CORE_DEPS) $NGX_ADDON_DEPS

END

fi


# nginx

ngx_all_srcs=`echo $ngx_all_srcs | sed -e "s/\//$ngx_regex_dirsep/g"`

for ngx_src in $NGX_ADDON_SRCS
do
    ngx_obj="addon/`basename \`dirname $ngx_src\``"

    test -d $NGX_OBJS/$ngx_obj || mkdir -p $NGX_OBJS/$ngx_obj

    ngx_obj=`echo $ngx_obj/\`basename $ngx_src\` \
        | sed -e "s/\//$ngx_regex_dirsep/g"`

    ngx_all_srcs="$ngx_all_srcs $ngx_obj"
done

ngx_all_objs=`echo $ngx_all_srcs \
    | sed -e "s#\([^ ]*\.\)cpp#$NGX_OBJS\/\1$ngx_objext#g" \
          -e "s#\([^ ]*\.\)cc#$NGX_OBJS\/\1$ngx_objext#g" \
          -e "s#\([^ ]*\.\)c#$NGX_OBJS\/\1$ngx_objext#g" \
          -e "s#\([^ ]*\.\)S#$NGX_OBJS\/\1$ngx_objext#g"`

ngx_modules_c=`echo $NGX_MODULES_C | sed -e "s/\//$ngx_regex_dirsep/g"`

ngx_modules_obj=`echo $ngx_modules_c | sed -e "s/\(.*\.\)c/\1$ngx_objext/"`


if test -n "$NGX_RES"; then
   ngx_res=$NGX_RES
else
   ngx_res="$NGX_RC $NGX_ICONS"
   ngx_rcc=`echo $NGX_RCC | sed -e "s/\//$ngx_regex_dirsep/g"`
fi

ngx_deps=`echo $ngx_all_objs $ngx_modules_obj $ngx_res $LINK_DEPS \
    | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
          -e "s/\//$ngx_regex_dirsep/g"`

ngx_objs=`echo $ngx_all_objs $ngx_modules_obj \
    | sed -e "s/  *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
          -e "s/\//$ngx_regex_dirsep/g"`

ngx_libs=
if test -n "$NGX_LD_OPT$CORE_LIBS"; then
    ngx_libs=`echo $NGX_LD_OPT $CORE_LIBS \
        | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`
fi

ngx_link=${CORE_LINK:+`echo $CORE_LINK \
    | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}

ngx_main_link=${MAIN_LINK:+`echo $MAIN_LINK \
    | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}


cat << END                                                    >> $NGX_MAKEFILE

build:	binary modules manpage

binary:	$NGX_OBJS${ngx_dirsep}nginx$ngx_binext

$NGX_OBJS${ngx_dirsep}nginx$ngx_binext:	$ngx_deps$ngx_spacer
	\$(LINK) $ngx_long_start$ngx_binout$NGX_OBJS${ngx_dirsep}nginx$ngx_binext$ngx_long_cont$ngx_objs$ngx_libs$ngx_link$ngx_main_link
	$ngx_rcc
$ngx_long_end

modules:
END


# ngx_modules.c

if test -n "$NGX_PCH"; then
    ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
else
    ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) \$(CORE_INCS)"
fi

cat << END                                                    >> $NGX_MAKEFILE

$ngx_modules_obj:	\$(CORE_DEPS)$ngx_cont$ngx_modules_c
	$ngx_cc$ngx_tab$ngx_objout$ngx_modules_obj$ngx_tab$ngx_modules_c$NGX_AUX

END


# the core sources

for ngx_src in $CORE_SRCS
do
    ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
    ngx_obj=`echo $ngx_src \
        | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
              -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
              -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
              -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

    cat << END                                                >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END

done


# the http sources

if [ $HTTP = YES ]; then

    if test -n "$NGX_PCH"; then
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
    else
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) \$(CORE_INCS) \$(HTTP_INCS)"
        ngx_perl_cc="\$(CC) $ngx_compile_opt \$(NGX_PERL_CFLAGS)"
        ngx_perl_cc="$ngx_perl_cc \$(CORE_INCS) \$(HTTP_INCS)"
    fi

    for ngx_source in $HTTP_SRCS
    do
        ngx_src=`echo $ngx_source | sed -e "s/\//$ngx_regex_dirsep/g"`
        ngx_obj=`echo $ngx_src \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        if [ $ngx_source = src/http/modules/perl/ngx_http_perl_module.c ]; then

            cat << END                                        >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS) \$(HTTP_DEPS)$ngx_cont$ngx_src
	$ngx_perl_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
        else

            cat << END                                        >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS) \$(HTTP_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END

        fi
    done

fi


# the mail sources

if [ $MAIL = YES ]; then

    if test -n "$NGX_PCH"; then
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
    else
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) \$(CORE_INCS) \$(MAIL_INCS)"
    fi

    for ngx_src in $MAIL_SRCS
    do
        ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
        ngx_obj=`echo $ngx_src \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        cat << END                                            >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS) \$(MAIL_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
    done

fi


# the stream sources

if [ $STREAM = YES ]; then

    if test -n "$NGX_PCH"; then
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
    else
        ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) \$(CORE_INCS) \$(STREAM_INCS)"
    fi

    for ngx_src in $STREAM_SRCS
    do
        ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
        ngx_obj=`echo $ngx_src \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        cat << END                                            >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS) \$(STREAM_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
    done

fi


# the misc sources

if test -n "$MISC_SRCS"; then

    ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"

    for ngx_src in $MISC_SRCS
    do
        ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`
        ngx_obj=`echo $ngx_src \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        cat << END                                            >> $NGX_MAKEFILE

$ngx_obj:	\$(CORE_DEPS) $ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
    done

fi


# the addons sources

if test -n "$NGX_ADDON_SRCS"; then

    ngx_cc="\$(CC) $ngx_compile_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"

    for ngx_src in $NGX_ADDON_SRCS
    do
        ngx_obj="addon/`basename \`dirname $ngx_src\``"

        ngx_obj=`echo $ngx_obj/\`basename $ngx_src\` \
            | sed -e "s/\//$ngx_regex_dirsep/g"`

        ngx_obj=`echo $ngx_obj \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`

        cat << END                                            >> $NGX_MAKEFILE

$ngx_obj:	\$(ADDON_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
    done

fi


# the addons config.make

if test -n "$NGX_ADDONS$DYNAMIC_ADDONS"; then

    for ngx_addon_dir in $NGX_ADDONS $DYNAMIC_ADDONS
    do
        if test -f $ngx_addon_dir/config.make; then
            . $ngx_addon_dir/config.make
        fi
    done
fi


# Win32 resource file

if test -n "$NGX_RES"; then

    ngx_res=`echo "$NGX_RES:	$NGX_RC $NGX_ICONS" \
                 | sed -e "s/\//$ngx_regex_dirsep/g"`
    ngx_rcc=`echo $NGX_RCC | sed -e "s/\//$ngx_regex_dirsep/g"`

    cat << END                                                >> $NGX_MAKEFILE

$ngx_res
	$ngx_rcc

END

fi


# the precompiled headers

if test -n "$NGX_PCH"; then
    echo "#include <ngx_config.h>" > $NGX_OBJS/ngx_pch.c

    ngx_pch="src/core/ngx_config.h $OS_CONFIG $NGX_OBJS/ngx_auto_config.h"
    ngx_pch=`echo "$NGX_PCH:	$ngx_pch" | sed -e "s/\//$ngx_regex_dirsep/g"`

    ngx_src="\$(CC) \$(CFLAGS) $NGX_BUILD_PCH $ngx_compile_opt \$(ALL_INCS)"
    ngx_src="$ngx_src $ngx_objout$NGX_OBJS/ngx_pch.obj $NGX_OBJS/ngx_pch.c"
    ngx_src=`echo $ngx_src | sed -e "s/\//$ngx_regex_dirsep/g"`

    cat << END                                                >> $NGX_MAKEFILE

$ngx_pch
	$ngx_src

END

fi


# dynamic modules

if test -n "$NGX_PCH"; then
    ngx_cc="\$(CC) $ngx_compile_opt $ngx_pic_opt \$(CFLAGS) $ngx_use_pch \$(ALL_INCS)"
else
    ngx_cc="\$(CC) $ngx_compile_opt $ngx_pic_opt \$(CFLAGS) \$(ALL_INCS)"
    ngx_perl_cc="\$(CC) $ngx_compile_opt $ngx_pic_opt \$(NGX_PERL_CFLAGS)"
    ngx_perl_cc="$ngx_perl_cc \$(ALL_INCS)"
fi

for ngx_module in $DYNAMIC_MODULES
do
    eval ngx_module_srcs="\$${ngx_module}_SRCS"
    eval ngx_module_shrd="\$${ngx_module}_SHRD"
    eval eval ngx_module_libs="\\\"\$${ngx_module}_LIBS\\\""

    eval ngx_module_modules="\$${ngx_module}_MODULES"
    eval ngx_module_order="\$${ngx_module}_ORDER"

    ngx_modules_c=$NGX_OBJS/${ngx_module}_modules.c

    cat << END                                    > $ngx_modules_c

#include <ngx_config.h>
#include <ngx_core.h>

END

    for mod in $ngx_module_modules
    do
        echo "extern ngx_module_t  $mod;"         >> $ngx_modules_c
    done

    echo                                          >> $ngx_modules_c
    echo 'ngx_module_t *ngx_modules[] = {'        >> $ngx_modules_c

    for mod in $ngx_module_modules
    do
        echo "    &$mod,"                         >> $ngx_modules_c
    done

    cat << END                                    >> $ngx_modules_c
    NULL
};

END

    echo 'char *ngx_module_names[] = {'           >> $ngx_modules_c

    for mod in $ngx_module_modules
    do
        echo "    \"$mod\","                      >> $ngx_modules_c
    done

    cat << END                                    >> $ngx_modules_c
    NULL
};

END

    echo 'char *ngx_module_order[] = {'           >> $ngx_modules_c

    for mod in $ngx_module_order
    do
        echo "    \"$mod\","                      >> $ngx_modules_c
    done

    cat << END                                    >> $ngx_modules_c
    NULL
};

END

    ngx_modules_c=`echo $ngx_modules_c | sed -e "s/\//$ngx_regex_dirsep/g"`

    ngx_modules_obj=`echo $ngx_modules_c \
        | sed -e "s/\(.*\.\)c/\1$ngx_objext/"`

    ngx_module_objs=
    for ngx_src in $ngx_module_srcs $ngx_module_shrd
    do
        case "$ngx_src" in
            src/*)
                ngx_obj=$ngx_src
                ;;
            *)
                ngx_obj="addon/`basename \`dirname $ngx_src\``"
                mkdir -p $NGX_OBJS/$ngx_obj
                ngx_obj="$ngx_obj/`basename $ngx_src`"
                ;;
        esac

        ngx_module_objs="$ngx_module_objs $ngx_obj"
    done

    ngx_module_objs=`echo $ngx_module_objs \
        | sed -e "s#\([^ ]*\.\)cpp#$NGX_OBJS\/\1$ngx_objext#g" \
              -e "s#\([^ ]*\.\)cc#$NGX_OBJS\/\1$ngx_objext#g" \
              -e "s#\([^ ]*\.\)c#$NGX_OBJS\/\1$ngx_objext#g" \
              -e "s#\([^ ]*\.\)S#$NGX_OBJS\/\1$ngx_objext#g"`

    ngx_deps=`echo $ngx_module_objs $ngx_modules_obj $LINK_DEPS \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_regex_cont\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    ngx_objs=`echo $ngx_module_objs $ngx_modules_obj \
        | sed -e "s/  *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
              -e "s/\//$ngx_regex_dirsep/g"`

    ngx_obj=$NGX_OBJS$ngx_dirsep$ngx_module$ngx_modext

    if [ "$NGX_PLATFORM" = win32 ]; then
        ngx_module_libs="$CORE_LIBS $ngx_module_libs"
    fi

    ngx_libs=
    if test -n "$NGX_LD_OPT$ngx_module_libs"; then
        ngx_libs=`echo $NGX_LD_OPT $ngx_module_libs \
            | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`
    fi

    ngx_link=${CORE_LINK:+`echo $CORE_LINK \
        | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}

    ngx_module_link=${MODULE_LINK:+`echo $MODULE_LINK \
        | sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`}


    cat << END                                            >> $NGX_MAKEFILE

modules:	$ngx_obj

$ngx_obj:	$ngx_deps$ngx_spacer
	\$(LINK) $ngx_long_start$ngx_binout$ngx_obj$ngx_long_cont$ngx_objs$ngx_libs$ngx_link$ngx_module_link
$ngx_long_end

$ngx_modules_obj:	\$(CORE_DEPS)$ngx_cont$ngx_modules_c
	$ngx_cc$ngx_tab$ngx_objout$ngx_modules_obj$ngx_tab$ngx_modules_c$NGX_AUX

END

    for ngx_source in $ngx_module_srcs
    do
        case "$ngx_source" in
            src/*)
                ngx_obj=`echo $ngx_source | sed -e "s/\//$ngx_regex_dirsep/g"`
                ;;
            *)
                ngx_obj="addon/`basename \`dirname $ngx_source\``"
                ngx_obj=`echo $ngx_obj/\`basename $ngx_source\` \
                    | sed -e "s/\//$ngx_regex_dirsep/g"`
                ;;
        esac

        ngx_obj=`echo $ngx_obj \
            | sed -e "s#^\(.*\.\)cpp\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)cc\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)c\\$#$ngx_objs_dir\1$ngx_objext#g" \
                  -e "s#^\(.*\.\)S\\$#$ngx_objs_dir\1$ngx_objext#g"`

        ngx_src=`echo $ngx_source | sed -e "s/\//$ngx_regex_dirsep/g"`

        if [ $ngx_source = src/http/modules/perl/ngx_http_perl_module.c ]; then

            cat << END                                        >> $NGX_MAKEFILE

$ngx_obj:	\$(ADDON_DEPS)$ngx_cont$ngx_src
	$ngx_perl_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END
        else

            cat << END                                        >> $NGX_MAKEFILE

$ngx_obj:	\$(ADDON_DEPS)$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END

        fi
    done
done