Hopefully *BSD prototypes agree. :-(

variants (gmtime_r, localtime_r, and ctime_r) for thread-safe operation on Unix

file are silently refused (same format as other text/*.can files).

to download a file, it attempts to CWD to the path, and if the CWD succeeds
the subsequent requested paths are all wrong. This fixes that problem.

the actual read/write permissions (FTP clients should ignore them anyway).

Increased the select timeout in sockprintf() from 1 to 5 minutes.
Changed the server cycle frequency from 5 to 2 seconds (checks for recycling
semaphores).

operation).

(for Linux setuid fix in sbbscon.c).
Removed unnecessary seteuid calls around PASV port binding.

(will segfault on glibc/libc if called with invalid descriptor).

No need to reset options after accept().

control of socket options for all open and accepted sockets.

return value (some implementations do not return negative on overflow).