The scr_dump routine dumps the current contents of the virtualscreen to the file filename.
The scr_restore routine sets the virtual screen to the contents
of filename, which must have been written using scr_dump. The
next call to doupdate restores the physical screen to the way it
looked in the dump file.
The scr_init routine reads in the contents of filename and uses
them to initialize the curses data structures about what the
terminal currently has on its screen. If the data is determined
to be valid, curses bases its next update of the screen on this
information rather than clearing the screen and starting from
scratch. scr_init is used after initscr or a system call to
share the screen with another process which has done a scr_dump
after its endwin(3X) call. The data is declared invalid
• if the terminfo capabilities rmcup and nrrmc exist, also
• if the terminal has been written to since the preceding
The scr_set routine is a combination of scr_restore and scr_init.
It tells the program that the information in filename is what is
currently on the screen, and also what the program wants on the
screen. This can be thought of as a screen inheritance function.
To read (write) a window from (to) a file, use the getwin and
putwin routines [see curs_util(3X)].
The XSI Curses standard, Issue 4, describes these functions
(adding the const qualifiers).
The SVr4 docs merely say under scr_init that the dump data is
also considered invalid "if the time-stamp of the tty is old" but
do not define “old”.
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