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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

libssh2_sftp_unlink_ex

libssh2_sftp_unlink_ex(3)					  libssh2 manual					 libssh2_sftp_unlink_ex(3)

NAME

       libssh2_sftp_unlink_ex - unlink an SFTP file

SYNOPSIS

       #include <libssh2.h> #include <libssh2_sftp.h>

       int libssh2_sftp_unlink_ex(LIBSSH2_SFTP *sftp, const char *filename, unsigned int filename_len);

       int libssh2_sftp_unlink(LIBSSH2_SFTP *sftp, const char *filename);

DESCRIPTION

       sftp - SFTP instance as returned by libssh2_sftp_init(3)

       filename - Path and name of the existing filesystem entry

       filename_len - Length of the path and name of the existing filesystem entry

       Unlink (delete) a file from the remote filesystem.

RETURN VALUE

       Return 0 on success or negative on failure.  It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a
       negative number, it isn't really a failure per se.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

       LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

       LIBSSH2_ERROR_SOCKET_TIMEOUT -

       LIBSSH2_ERROR_SFTP_PROTOCOL - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to	be
       returned by the server.

SEE ALSO

       libssh2_sftp_init(3)

libssh2 0.15							    1 Jun 2007						 libssh2_sftp_unlink_ex(3)