Upstream: better handling of invalid headers in cache files. If cache file is truncated, it is possible that u->process_header() will return NGX_AGAIN. Added appropriate handling of this case by changing the error to NGX_HTTP_UPSTREAM_INVALID_HEADER. Also, added appropriate logging of this and NGX_HTTP_UPSTREAM_INVALID_HEADER cases at the "crit" level. Note that this will result in duplicate logging in case of NGX_HTTP_UPSTREAM_INVALID_HEADER. While this is something better to avoid, it is considered to be an overkill to implement cache-specific error logging in u->process_header(). Additionally, u->buffer.start is now reset to be able to receive a new response, and u->cache_status set to MISS to provide the value in the $upstream_cache_status variable, much like it happens on other cache file errors detected by ngx_http_file_cache_read(), instead of HIT, which is believed to be misleading.

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


echo $ngx_n "checking for system byte ordering ...$ngx_c"

cat << END >> $NGX_AUTOCONF_ERR

----------------------------------------
checking for system byte ordering

END


cat << END > $NGX_AUTOTEST.c

int main(void) {
    int i = 0x11223344;
    char *p;

    p = (char *) &i;
    if (*p == 0x44) return 0;
    return 1;
}

END

ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
          -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"

eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"

if [ -x $NGX_AUTOTEST ]; then
    if $NGX_AUTOTEST >/dev/null 2>&1; then
        echo " little endian"
        have=NGX_HAVE_LITTLE_ENDIAN . auto/have
    else
        echo " big endian"
    fi

    rm -rf $NGX_AUTOTEST*

else
    rm -rf $NGX_AUTOTEST*

    echo
    echo "$0: error: cannot detect system byte ordering"
    exit 1
fi