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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::sftp::foreign::constants

Net::SFTP::Foreign::Constants(3pm)			User Contributed Perl Documentation			Net::SFTP::Foreign::Constants(3pm)

NAME

       Net::SFTP::Foreign::Constants - Constant definitions for Net::SFTP::Foreign

SYNOPSIS

	   use Net::SFTP::Foreign::Constants qw(:tag SSH2_FILEXFER_VERSION);
	   print "Protocol version is ", SSH2_FILEXFER_VERSION;

DESCRIPTION

       Net::SFTP::Foreign::Constants provides a list of exportable SFTP constants: for SFTP messages and commands, for file-open flags, for status
       messages, etc. Constants can be exported individually, or in sets identified by tag names.

       Net::SFTP::Foreign::Constants provides values for all of the constants listed in the SFTP protocol version 3 draft; the only thing to note
       is that the constants are listed with the prefix "SSH2_" instead of "SSH_". So, for example, to import the constant for the file-open
       command, you would write:

	   use Net::SFTP::Foreign::Constants qw( SSH2_FXP_OPEN );

TAGS

       As mentioned above, constants can either be imported individually or in sets grouped by tag names. The tag names are:

       :fxp
	   Imports all of the "SSH2_FXP_*" constants: these are the constants used in the messaging protocol.

       :flags
	   Imports all of the "SSH2_FXF_*" constants: these are constants used as flags sent to the server when opening files.

       :att
	   Imports all of the "SSH2_FILEXFER_ATTR_*" constants: these are the constants used to construct the flag in the serialized attributes.
	   The flag describes what types of file attributes are listed in the buffer.

       :status
	   Imports all of the "SSH2_FX_*" constants: these are constants returned from a server "SSH2_FXP_STATUS" message and indicate the status
	   of a particular operation.

       :error
	   Imports all the "SFTP_ERR_*" constants used to represent high level errors: "SFTP_ERR_LOCAL_ALREADY_EXISTS",
	   "SFTP_ERR_LOCAL_CHMOD_FAILED", "SFTP_ERR_LOCAL_OPEN_FAILED", "SFTP_ERR_LOCAL_READ_ERROR", "SFTP_ERR_LOCAL_STAT_FAILED",
	   "SFTP_ERR_LOCAL_UTIME_FAILED", "SFTP_ERR_LOCAL_WRITE_FAILED", "SFTP_ERR_REMOTE_BAD_PACKET_SEQUENCE", "SFTP_ERR_REMOTE_BAD_PERMISSIONS",
	   "SFTP_ERR_REMOTE_BAD_TIME", "SFTP_ERR_REMOTE_BLOCK_TOO_SMALL", "SFTP_ERR_REMOTE_CLOSE_FAILED", "SFTP_ERR_REMOTE_FSETSTAT_FAILED",
	   "SFTP_ERR_REMOTE_FSTAT_FAILED", "SFTP_ERR_REMOTE_LSTAT_FAILED", "SFTP_ERR_REMOTE_MKDIR_FAILED", "SFTP_ERR_REMOTE_OPENDIR_FAILED",
	   "SFTP_ERR_REMOTE_OPEN_FAILED", "SFTP_ERR_REMOTE_READDIR_FAILED", "SFTP_ERR_REMOTE_READ_FAILED", "SFTP_ERR_REMOTE_REALPATH_FAILED",
	   "SFTP_ERR_REMOTE_REMOVE_FAILED", "SFTP_ERR_REMOTE_RENAME_FAILED", "SFTP_ERR_REMOTE_RMDIR_FAILED", "SFTP_ERR_REMOTE_READLINK_FAILED",
	   "SFTP_ERR_REMOTE_SYMLINK_FAILED", "SFTP_ERR_REMOTE_SETSTAT_FAILED", "SFTP_ERR_REMOTE_STAT_FAILED", "SFTP_ERR_REMOTE_WRITE_FAILED" and
	   "SFTP_ERR_REMOTE_HARDLINK_FAILED".

	   Note: these constants are not defined on the SFTP draft.

       :ext
	   Import all the "SSH2_FXE_*" constants: there are the constants defined for usage with SFTP extensions.

	   Currently, these are supported: "SSH2_FXE_STATVFS_ST_RDONLY", "SSH_FXE_STATVFS_ST_NOSUID".

       There is one constant that does not fit into any of the tag sets: "SSH2_FILEXFER_VERSION", which holds the value of the SFTP protocol
       implemented by Net::SFTP::Foreign.

AUTHOR &; COPYRIGHTS
       Please see the Net::SFTP::Foreign manpage for author, copyright, and license information.

perl v5.14.2							    2012-05-11					Net::SFTP::Foreign::Constants(3pm)