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SFTP not working in the background

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Old 08-19-2010
SFTP not working in the background
I'm modifying some code to SFTP files because the remote servername and user are changing. The keys have been correctly installed and I'm using the -B option to automate the actions following connection e.g. cd, put etc. This is all working nicely. However, when I wrap this up to call it from a daemon process, it hangs! Investigation seems to show that I'm getting a SIGTTOU message and the sftp process stops. The process seems to work fine to the old server - both old and new sftp servers are windows based!
Are there any SFTP server configurations that define whether the client must run interactively or daemonised?
If the server can't be changed, what options do I have at the client end? Do I catch the SIGTTOU and ignore it?

---------- Post updated at 12:13 PM ---------- Previous update was at 11:19 AM ----------

Well just rechecked connectivity to the old server which used to work but doesn't any longer, so looks like it may be a client side issue!
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LEARN ABOUT DEBIAN

net::ssh2::sftp

Net::SSH2::SFTP(3pm)					User Contributed Perl Documentation				      Net::SSH2::SFTP(3pm)

NAME

       Net::SSH2::SFTP - SSH 2 Secure FTP object

DESCRIPTION

       An SFTP object is created by the Net::SSH2 "sftp" method.

   error
       Returns the last SFTP error (one of the LIBSSH2_FX_* constants).  Use this when Net::SSH2::error returns LIBSSH2_ERROR_SFTP_PROTOCOL.  In
       list context, returns (code, error name).

   open ( file [, flags [, mode ]]] )
       Open or create a file on the remote host.  The flags are the standard O_RDONLY, O_WRONLY, O_RDWR, O_APPEND, O_CREAT, O_TRUNC, and O_EXCL,
       which may be combined as usual.	Flags default to O_RDONLY and mode to 0666 (create only).  Returns a Net::SSH2::File object on success.

   opendir ( dir )
       Open a directory on the remote host; returns a Net::SSH2::Dir object on success.

   unlink ( file )
       Delete the remote file.

   rename ( old, new [, flags ] )
       Rename old to new.  Flags are taken from LIBSSH2_SFTP_RENAME_*, and may be combined; the default is to use all (overwrite, atomic, native).

   mkdir ( path [, mode ] )
       Create directory; mode defaults to 0777.

   rmdir ( path )
       Remove directory.

   stat ( path [, follow ] )
       Get file attributes for the given path.	If follow is set (default), will follow symbolic links.  On success, returns a hash containing the
       following:

       mode
       size
       uid
       gid
       atime
       mtime

   setstat ( path, key, value... )
       Set file attributes for given path; keys are the same as those returned by stat; note that it's not necessary to pass them all.

   symlink ( path, target [, type ] )
       Create a symbolic link to a given target.

   readlink ( path )
       Return the target of the given link, undef on failure.

   realpath ( path )
       Resolve a filename's path; returns the resolved path, or undef on error.

SEE ALSO

       Net::SSH2.

AUTHOR

       David B. Robins, <dbrobins@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2005, 2006 by David B. Robins; all rights reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.0 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2011-05-06						      Net::SSH2::SFTP(3pm)