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Events: fixed EPOLLRDHUP with FIONREAD (ticket #2367). When reading exactly rev->available bytes, rev->available might become 0 after FIONREAD usage introduction in efd71d49bde0. On the next call of ngx_readv_chain() on systems with EPOLLRDHUP this resulted in return without any actions, that is, with rev->ready set, and this in turn resulted in no timers set in event pipe, leading to socket leaks. Fix is to reset rev->ready in ngx_readv_chain() when returning due to rev->available being 0 with EPOLLRDHUP, much like it is already done in ngx_unix_recv(). This ensures that if rev->available will become 0, on systems with EPOLLRDHUP support appropriate EPOLLRDHUP-specific handling will happen on the next ngx_readv_chain() call. While here, also synced ngx_readv_chain() to match ngx_unix_recv() and reset rev->ready when returning due to rev->available being 0 with kqueue. This is mostly cosmetic change, as rev->ready is anyway reset when rev->available is set to 0.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 15 Jul 2022 15:19:32 +0300
parents ec2e6893caaa
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_FREEBSD . auto/have_headers

CORE_INCS="$UNIX_INCS"
CORE_DEPS="$UNIX_DEPS $FREEBSD_DEPS"
CORE_SRCS="$UNIX_SRCS $FREEBSD_SRCS"

ngx_spacer='
'


# __FreeBSD_version and sysctl kern.osreldate are the best ways
# to determine whether some capability exists and is safe to use.
# __FreeBSD_version is used for the testing of the build environment.
# sysctl kern.osreldate is used for the testing of the kernel capabilities.

version=`grep "#define __FreeBSD_version" /usr/include/osreldate.h \
         | sed -e 's/^.* \(.*\)$/\1/'`

osreldate=`/sbin/sysctl -n kern.osreldate`


# setproctitle() in libutil

if [ \( $version -ge 500000 -a $version -lt 500012 \) \
     -o $version -lt 410002 ]
then
    echo " + setproctitle() in libutil"

    CORE_LIBS="$CORE_LIBS -lutil"
    NGX_SETPROCTITLE_LIB="-lutil"
fi

# sendfile

if [ $osreldate -gt 300007 ]; then
    echo " + sendfile() found"

    have=NGX_HAVE_SENDFILE . auto/have
    CORE_SRCS="$CORE_SRCS $FREEBSD_SENDFILE_SRCS"
fi

if [ $osreldate -gt 1100093 ]; then
    echo " + sendfile()'s SF_NODISKIO found"

    have=NGX_HAVE_SENDFILE_NODISKIO . auto/have
fi

# POSIX semaphores
# http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/127545

if [ $osreldate -ge 701106 ]; then
    echo " + POSIX semaphores should work"
else
    have=NGX_HAVE_POSIX_SEM . auto/nohave
fi


# kqueue

if [ \( $osreldate -lt 500000 -a $osreldate -ge 410000 \) \
     -o $osreldate -ge 500011 ]
then
    echo " + kqueue found"

    have=NGX_HAVE_KQUEUE . auto/have
    have=NGX_HAVE_CLEAR_EVENT . auto/have
    EVENT_MODULES="$EVENT_MODULES $KQUEUE_MODULE"
    CORE_SRCS="$CORE_SRCS $KQUEUE_SRCS"
    EVENT_FOUND=YES
fi


NGX_KQUEUE_CHECKED=YES


# kqueue's NOTE_LOWAT

if [ \( $version -lt 500000 -a $version -ge 430000 \) \
     -o $version -ge 500018 ]
then
    echo " + kqueue's NOTE_LOWAT found"
    have=NGX_HAVE_LOWAT_EVENT . auto/have
fi

# kqueue's EVFILT_TIMER

if [ \( $version -lt 500000 -a $version -ge 440001 \) \
     -o $version -ge 500023 ]
then
    echo " + kqueue's EVFILT_TIMER found"
    have=NGX_HAVE_TIMER_EVENT . auto/have
fi


# cpuset_setaffinity()

if [ $version -ge 701000 ]; then
    echo " + cpuset_setaffinity() found"
    have=NGX_HAVE_CPUSET_SETAFFINITY . auto/have
fi