DragonFly On-Line Manual Pages
scr_dump, scr_restore, scr_init, scr_set - read (write) a curses screen
from (to) a file
int scr_dump(const char *filename);
int scr_restore(const char *filename);
int scr_init(const char *filename);
int scr_set(const char *filename);
The scr_dump routine dumps the current contents of the virtual screen
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 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 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 scr_dump call.
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(3)].
All routines return the integer ERR upon failure and OK upon success.
X/Open defines no error conditions. In this implementation, each will
return an error if the file cannot be opened.
Note that scr_init, scr_set, and scr_restore may be macros.
The XSI Curses standard, Issue 4, describes these functions (adding the
The SVr4 docs merely say under scr_init that the dump data is also con-
sidered invalid "if the time-stamp of the tty is old" but do not define
curses(3), curs_initscr(3), curs_refresh(3), curs_util(3), system(3)