Re: menu problems

[Rob Benton]

Well I will try another approach to endwin() then.  The PREV/NEXT work
pretty well for me but is there any reason that my call to free_menu()
is ending with a SIGSEGV ?  This is the error gdb returns:

Program received signal SIGSEGV, Segmentation fault.
0x400268e2 in _nc_Disconnect_Items () from /usr/lib/libmenu.so.5

On Thu, May 08, 2003 at 05:26:21PM -0500, Rob Benton wrote:
> I hope this is the right place to be asking this question.  If not
> please let me know.
> 
> Because I was having problems w/menu functions in one of my programs I
> decided to write the simplest program I could w/a menu.  3 options on
> the menu and all it does is move the selection up or down if the up or
> down arrow keys are pressed or quit the program if 'q' is pressed.
> 
> menu_driver() returns E_REQUEST_DENIED when I send the REQ_UP or
> REQ_DOWN arguments.  And the program ends with a segmentation fault
when
> I call free_menu().
> 
> I must be doing something wrong but I can't figure out what.  I'd
> appreciate any input. (sorry for the ugly tabs)

offhand - the example 'menu_test()' function in test/ncurses.c uses
REQ_NEXT_ITEM and REQ_PREV_ITEM rather than REQ_UP/REQ_DOWN.

you shouldn't have to try to do endwin() in a signal handler (ncurses
already tries ;-).  It's possible to overload signal handlers, e.g.,
by calling the result of
        foo = signal(SIGINT, finish);
when 'foo' isn't one of the magic values.  I guess atexit() is more
reliable
though.

> 
> 
> 
> #include <curses.h>
> #include <menu.h>
> #include <signal.h>
> 
> void finish(int signal);
> 
> int main() {
>       int ch, rcode;
>       ITEM * flash, * beep, * quit;
>       MENU * mainmenu;
>       ITEM * mlist[3];
> 
>       initscr();
>       keypad(stdscr, true);
>       noecho();
> 
>       signal(SIGINT, finish);
> 
>       flash = new_item("flash", "");
>       beep = new_item("beep", "");
>       quit = new_item("quit", "");
>       mlist[0] = flash;
>       mlist[1] = beep;
>       mlist[2] = quit;
>       mlist[3] = NULL;
> 
>       mainmenu = new_menu(mlist);
>       set_menu_win(mainmenu, stdscr);
>       set_menu_sub(mainmenu, stdscr);
>       post_menu(mainmenu);
>       refresh();
> 
>       while(1) {
>               ch = getch();
>               switch(ch) {
>                       case 'q':
>                               unpost_menu(mainmenu);
>                               free_menu(mainmenu);
>                               free_item(flash);
>                               free_item(beep);
>                               free_item(quit);
>                               finish(0);
>                               break;
>                       case KEY_UP:
>                               rcode = menu_driver(mainmenu, REQ_PREV_ITEM);
>                               break;
>                       case KEY_DOWN:
>                               rcode = menu_driver(mainmenu, REQ_NEXT_ITEM);
>                               break;
>                       default:
>                               rcode = E_OK;
>               }
>               if (rcode != E_OK) {
>                       finish(rcode);
>               }
>       }
> }
> 
> void finish(int signal) {
>       endwin();
>       if (signal != 0) {
>               printf("err:%d\n", signal);
>       }
>       exit(signal);
> }