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使用tengine的syslog插件（--with-syslog），udp方式发送日志，由于$request_body较大，syslog只发了2048字节，后面的数据全部丢失。我用自己写的udp发送包，无限制。所以怀疑syslog发送udp有限制包大小，请问在哪里可以修改tengine中的syslog的udp包限制的配置？

src/os/unix/ngx_syslog.c

define NGX_SYSLOG_MAX_LENGTH 2048

rfc5424：
Transport receivers MAY receive
messages larger than 2048 octets in length. If a transport receiver
receives a message with a length larger than it supports, the
transport receiver SHOULD truncate the payload.

是否考虑分片UDP包？

RFC5426 Transmission of Syslog Messages over UDP
http://tools.ietf.org/html/rfc5426#section-3.2

All syslog receivers SHOULD be able to receive datagrams
with message sizes of up to and including 2048 octets. The ability
to receive larger messages is encouraged.