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Core: disabled SO_REUSEPORT when testing config (ticket #1300). When closing a socket with SO_REUSEPORT, Linux drops all connections waiting in this socket's listen queue. Previously, it was believed to only result in connection resets when reconfiguring nginx to use smaller number of worker processes. It also results in connection resets during configuration testing though. Workaround is to avoid using SO_REUSEPORT when testing configuration. It should prevent listening sockets from being created if a conflicting socket already exists, while still preserving detection of other possible errors. It should also cover UDP sockets. The only downside of this approach seems to be that a configuration testing won't be able to properly report the case when nginx was compiled with SO_REUSEPORT, but the kernel is not able to set it. Such errors will be reported on a real start instead.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 11 Jul 2017 19:59:56 +0300
parents a88e309f839b
children 639e48c382a6
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo "checking for $NGX_SYSTEM specific features"

case "$NGX_PLATFORM" in

    FreeBSD:*)
        . auto/os/freebsd
    ;;

    Linux:*)
        . auto/os/linux
    ;;

    SunOS:*)
        . auto/os/solaris
    ;;

    Darwin:*)
        . auto/os/darwin
    ;;

    win32)
        . auto/os/win32
    ;;

    DragonFly:*)
        have=NGX_FREEBSD . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $FREEBSD_DEPS"
        CORE_SRCS="$UNIX_SRCS $FREEBSD_SRCS"

        echo " + sendfile() found"
        have=NGX_HAVE_SENDFILE . auto/have
        CORE_SRCS="$CORE_SRCS $FREEBSD_SENDFILE_SRCS"

        ngx_spacer='
'
    ;;

    HP-UX:*)
        # HP/UX
        have=NGX_HPUX . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_HPUX_ALT_XOPEN_SOCKET_API"
    ;;

    OSF1:*)
        # Tru64 UNIX
        have=NGX_TRU64 . auto/have_headers
        have=NGX_HAVE_STRERROR_R . auto/nohave
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
    ;;

    GNU:*)
        # GNU Hurd
        have=NGX_GNU_HURD . auto/have_headers
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
        CC_AUX_FLAGS="$CC_AUX_FLAGS -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
    ;;

    *)
        CORE_INCS="$UNIX_INCS"
        CORE_DEPS="$UNIX_DEPS $POSIX_DEPS"
        CORE_SRCS="$UNIX_SRCS"
    ;;

esac


case "$NGX_MACHINE" in

    i386 | i686 | i86pc)
        have=NGX_HAVE_NONALIGNED . auto/have
        NGX_MACH_CACHE_LINE=32
    ;;

    amd64 | x86_64)
        have=NGX_HAVE_NONALIGNED . auto/have
        NGX_MACH_CACHE_LINE=64
    ;;

    sun4u | sun4v | sparc | sparc64)
        have=NGX_ALIGNMENT value=16 . auto/define
        # TODO
        NGX_MACH_CACHE_LINE=64
    ;;

    ia64 )
        have=NGX_ALIGNMENT value=16 . auto/define
        # TODO
        NGX_MACH_CACHE_LINE=64
    ;;

    *)
        have=NGX_ALIGNMENT value=16 . auto/define
        NGX_MACH_CACHE_LINE=32
    ;;

esac

if test -z "$NGX_CPU_CACHE_LINE"; then
    NGX_CPU_CACHE_LINE=$NGX_MACH_CACHE_LINE
fi

have=NGX_CPU_CACHE_LINE value=$NGX_CPU_CACHE_LINE . auto/define