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HTTP/2: fixed posted streams handling. A bug was introduced by 82efcedb310b that could lead to timing out of responses or segmentation fault, when accept_mutex was enabled. The output queue in HTTP/2 can contain frames from different streams. When the queue is sent, all related write handlers need to be called. In order to do so, the streams were added to the h2c->posted queue after handling sent frames. Then this queue was processed in ngx_http_v2_write_handler(). If accept_mutex is enabled, the event's "ready" flag is set but its handler is not called immediately. Instead, the event is added to the ngx_posted_events queue. At the same time in this queue can be events from upstream connections. Such events can result in sending output queue before ngx_http_v2_write_handler() is triggered. And at the time ngx_http_v2_write_handler() is called, the output queue can be already empty with some streams added to h2c->posted. But after 82efcedb310b, these streams weren't processed if all frames have already been sent and the output queue was empty. This might lead to a situation when a number of streams were get stuck in h2c->posted queue for a long time. Eventually these streams might get closed by the send timeout. In the worst case this might also lead to a segmentation fault, if already freed stream was left in the h2c->posted queue. This could happen if one of the streams was terminated but wasn't closed, due to the HEADERS frame or a partially sent DATA frame left in the output queue. If this happened the ngx_http_v2_filter_cleanup() handler removed the stream from the h2c->waiting or h2c->posted queue on termination stage, before the frame has been sent, and the stream was again added to the h2c->posted queue after the frame was sent. In order to fix all these problems and simplify the code, write events of fake stream connections are now added to ngx_posted_events instead of using a custom h2c->posted queue.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 28 Nov 2016 20:58:14 +0300
parents 05c894a598ea
children 0d2956dfc4e6
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/os/unix $NGX_OBJS/src/os/win32 \
         $NGX_OBJS/src/http $NGX_OBJS/src/http/v2 $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
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"; 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$ngx_long_cont$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

ngx_obj_deps="\$(CORE_DEPS)"
if [ $HTTP != NO ]; then
    ngx_obj_deps="$ngx_obj_deps \$(HTTP_DEPS)"
fi
if [ $MAIL != NO ]; then
    ngx_obj_deps="$ngx_obj_deps \$(MAIL_DEPS)"
fi
if [ $STREAM != NO ]; then
    ngx_obj_deps="$ngx_obj_deps \$(STREAM_DEPS)"
fi

for ngx_module in $DYNAMIC_MODULES
do
    eval ngx_module_srcs="\$${ngx_module}_SRCS"
    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 $ngx_module_srcs
    do
        case "$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:	$ngx_obj_deps$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:	$ngx_obj_deps$ngx_cont$ngx_src
	$ngx_cc$ngx_tab$ngx_objout$ngx_obj$ngx_tab$ngx_src$NGX_AUX

END

        fi
    done
done