DETACHTTY

NAME

SYNOPSIS

DESCRIPTION

attachtty is used to connect to a process running under detachtty. It copies between socket-path and stdin/out. It also catches SIGINT and arranges for it to be forwarded to the command, so the user may use Control-C in the usual fashion.

If you've used screen, it's a similar concept. Compared to screen, detachtty has

 * no capability to swap between different screens (it doesn't co-opt C-a)

 * no tty emulation (you can sanely use it in emacs comint modes)

 * no features (less to go wrong)

 * no configuration file

 * ability to spawn ssh to securely connect across the network

OPTIONS

For detachtty, the options are:

--no-detach

Don't fork into the background. Useful if you wish to start the program from inittab(5).

--dribble-file  dribblename

All input from and to the program being run is copied into dribblename (if unspecified, it is discarded).

--log-file  name

Status messages (client connects, disconnects, errors) are sent to name (if unspecified, they go to standard error).

--pid-file  pidname

The process ID of detachtty is written to pidname. See SIGNALS.

socket-path

The unix-domain socket. If access to command should be in any way restricted, so should this socket - i.e. it is recommended that you put it in a mode 700 directory.

command arguments

The command to run (which is searched for in the normal way). All remaining command line parameters are passed to it as arguments.

For attachtty, the options are instead:

socket-path

This is either the path to socket-path, or a "remote path" of the form username@host:socket-path where username@host is passed to ssh. The latter form is currently an alias for ssh -t username@host attachtty socket-path [text] and lets ssh manage the authentication, i.e. whether to ask for a password or not.

text

The text to write into the socket. It will be processed by the command executed from detachtty. For local sockets, the same effect can be obtained with (echo -e text'\r'; sleep timeout) | attachtty socket-path

timeout

The maximum timeout in seconds (defaults to 1) to wait for the written text to be processed. This is available only for local connections.

To detach from the tty without exiting from the server process, send attachtty any signal that it doesn't catch. See the SIGNALS section.

NOTES

detachtty does not search the user's PATH environment variable for the program to execute, so a full pathname must be provided.

If you get an immediate "Child terminated, exiting" message from detachtty, this usually means that the program you specified was not found or could not be executed (on Linux 2.4, execve(1) succeeds even if it didn't, so to speak).

You will probably go insane a lot more slowly if you use absolute pathnames for all filename arguments.

SIGNALS

Sending SIGHUP to the process identified by pidname will cause detachtty to close and reopen its log files.

Sending SIGTSTP to an attachtty process (usually from the keyboard with ^Z) will cause it to stop itelf, leaving the server process running. It can be resumed normally with the shell builtin command "fg".

Sending SIGQUIT to an attachtty process (usually from the keyboard with ^\) will cause it to detach from the tty and quit, leaving the server process running. Sometimes you need to press it twice.  

SEE ALSO

AUTHOR

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

NOTES

SIGNALS

SEE ALSO

AUTHOR