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fallback to lseek()/read() if mmap() fails (#fixes 2666)
e.g. when mmap() is used on lighttpd-controlled temporary files
used POST request body (mod_cgi) and PUT file upload (mod_webdav)
replace use of stream_open() on potentially untrusted files
(protect against SIGBUS if a file is modified while map is read)
Note: stream.[ch] may be removed in a future release
For now, stream.[ch] will read entire file into memory if mmap fails
and so it should only be used on trusted files, e.g. config files.
http_auth basic and digest files are typically small and so buffered
stdio fopen(), fgets(), fclose() will likely be approximately as fast
as mmap.
mod_dirlisting header and readme files are typically small and so
open(), read(), close() will typically be approximately as fast as mmap
mod_ssi will likely be much faster, now buffering SSI page construction
rather than a potentially huge number of file open() calls, one for each
tiny chunk of text between SSI directives.
mod_webdav COPY and MOVE may be slower due to removal of mmap, but are
now more resilient to partial writes.
x-ref:
"handle filesystems without mmap() support"
https://redmine.lighttpd.net/issues/2666
"WebDAV upload-> mmap failed: operation not permitted"
https://redmine.lighttpd.net/issues/962
"Lighttpd 1.4.20 Crash (SIGBUS in mod_compress)"
https://redmine.lighttpd.net/issues/1879
"Crash SIGBUS"
https://redmine.lighttpd.net/issues/2391
github: closes #57
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