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RATPOISON env var.
* src/ratpoison.h (FD_CLOEXEC): new define
(set_close_on_exec): new prototype
* src/main.c (ratpoison_longopts): add "interactive" option.
(ratpoison_opts): likewise
(print_help): print a help line for interactive option.
(set_close_on_exec): new function
(read_startup_files): call set_close_on_exec on file pointer
(main): parse interactive command line option and pass it to
send_command.
* src/events.c (execute_remote_command): pass the interactive bit
to command.
* src/communications.c (send_command): send an interactive bit at
the beginning of the message. Take an interactive argument. All
callers updated. Prototype updated.
* src/actions.c (cmd_source): call set_close_on_exec on file pointer.
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