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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 MOJAVE

curlopt_ftp_create_missing_dirs

CURLOPT_FTP_CREATE_MISSING_DIRS(3)			     curl_easy_setopt options				CURLOPT_FTP_CREATE_MISSING_DIRS(3)

NAME

       CURLOPT_FTP_CREATE_MISSING_DIRS - create missing dirs for FTP and SFTP

SYNOPSIS

       #include <curl/curl.h>

       typedef enum {
	 CURLFTP_CREATE_DIR_NONE,
	 CURLFTP_CREATE_DIR,
	 CURLFTP_CREATE_DIR_RETRY
       } curl_ftpcreatedir;

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_CREATE_MISSING_DIRS,
				 long create);

DESCRIPTION

       Pass  a long telling libcurl to create the dir. If the value is CURLFTP_CREATE_DIR (1), libcurl will attempt to create any remote directory
       that it fails to "move" into.

       For FTP requests, that means a CWD command fails. CWD being the command that changes working directory.

       For SFTP requests, libcurl will attempt to create the remote directory if it can't obtain a handle to  the  target-location.  The  creation
       will fail if a file of the same name as the directory to create already exists or lack of permissions prevents creation.

       Setting	create	to CURLFTP_CREATE_DIR_RETRY (2), tells libcurl to retry the CWD command again if the subsequent MKD command fails. This is
       especially useful if you're doing many simultaneous connections against the same server and they all have this option enabled, as then  CWD
       may first fail but then another connection does MKD before this connection and thus MKD fails but trying CWD works!

DEFAULT

       CURLFTP_CREATE_DIR_NONE (0)

PROTOCOLS

       FTP and SFTP

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.10.7. SFTP support added in 7.16.3. The retry option was added in 7.19.4.

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if the create value is not.

SEE ALSO

       CURLOPT_FTP_FILEMETHOD(3), CURLOPT_FTP_USE_EPSV(3),

libcurl 7.54.0							 February 03, 2016				CURLOPT_FTP_CREATE_MISSING_DIRS(3)