Merge of r5004, r5019-r5025: ssl fixes. *) SSL: speedup loading of configs with many ssl servers. The patch saves one EC_KEY_generate_key() call per server{} block by informing OpenSSL about SSL_OP_SINGLE_ECDH_USE we are going to use before the SSL_CTX_set_tmp_ecdh() call. For a configuration file with 10k simple server{} blocks with SSL enabled this change reduces startup time from 18s to 5s on a slow test box here. *) SSL: removed conditions that always hold true. *) SSL: resetting of flush flag after the data was written. There is no need to flush next chunk of data if it does not contain a buffer with the flush or last_buf flags set. *) SSL: preservation of flush flag for buffered data. Previously, if SSL buffer was not sent we lost information that the data must be flushed. *) SSL: calculation of buffer size moved closer to its usage. No functional changes. *) SSL: avoid calling SSL_write() with zero data size. According to documentation, calling SSL_write() with num=0 bytes to be sent results in undefined behavior. We don't currently call ngx_ssl_send_chain() with empty chain and buffer. This check handles the case of a chain with total data size that is a multiple of NGX_SSL_BUFSIZE, and with the special buffer at the end. In practice such cases resulted in premature connection close and critical error "SSL_write() failed (SSL:)" in the error log. *) SSL: take into account data in the buffer while limiting output. In some rare cases this can result in a more smooth sending rate. *) SSL: fixed ngx_ssl_handshake() with level-triggered event methods. Missing calls to ngx_handle_write_event() and ngx_handle_read_event() resulted in a CPU hog during SSL handshake if an level-triggered event method (e.g. select) was used.

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


NGX_MAKEFILE=$NGX_OBJS/Makefile
NGX_MODULES_C=$NGX_OBJS/ngx_modules.c

NGX_AUTO_HEADERS_H=$NGX_OBJS/ngx_auto_headers.h
NGX_AUTO_CONFIG_H=$NGX_OBJS/ngx_auto_config.h

NGX_AUTOTEST=$NGX_OBJS/autotest
NGX_AUTOCONF_ERR=$NGX_OBJS/autoconf.err

# STUBs
NGX_ERR=$NGX_OBJS/autoconf.err
MAKEFILE=$NGX_OBJS/Makefile


NGX_PCH=
NGX_USE_PCH=


# check the echo's "-n" option and "\c" capability

if echo "test\c" | grep c >/dev/null; then

    if echo -n test | grep n >/dev/null; then
        ngx_n=
        ngx_c=

    else
        ngx_n=-n
        ngx_c=
    fi

else
    ngx_n=
    ngx_c='\c'
fi


# create Makefile

cat << END > Makefile

default:	build

clean:
	rm -rf Makefile $NGX_OBJS
END