Is gp_exit() used at exit in current gnuplot?

[Tatsuro M. <tma...@ya...>]

This is related to bug #1913.

In stdfn.c

there stated


/* Calls the cleanup functions registered using gp_atexit().
 * Normally gnuplot should be exited using gp_exit(). In some cases, this is not
 * possible (notably when returning from main(), where some compilers get
 * confused because they expect a return statement at the very end. In that
 * case, gp_exit_cleanup() should be called before the return statement.
 */


*****************************

Normally gnuplot should be exited using gp_exit().
***************************


However, quick test by gdb

gdb gnuplot
b gp_exit_cleanup
b gp_exit
b debug_exit_handler
r

At gnuplot prompt

gnuplot> exit

gdb tells that gnuplot does not end by gp_exit but by debug_exit_handler.
by exit command value of exit_handlers


On  cygwin

Breakpoint 1, gp_exit_cleanup () at ../../gnuplot/src/stdfn.c:440
440     {
(gdb) n
[New Thread 8120.0x26b8]
447         while (exit_handlers) {
(gdb) n
449             (*handler->function)();
(gdb) n
[New Thread 8120.0x27cc]
451             exit_handlers = handler->next;
(gdb) n
452             free(handler);
(gdb) n
451             exit_handlers = handler->next;
(gdb) n
452             free(handler);
(gdb) n
447         while (exit_handlers) {
(gdb) n
449             (*handler->function)();
(gdb) n
451             exit_handlers = handler->next;
(gdb) n
452             free(handler);
(gdb) n
451             exit_handlers = handler->next;
(gdb) n
452             free(handler);
(gdb) n
447         while (exit_handlers) {
(gdb) n
454     }
(gdb) n
main (argc=<optimized out>, argv=<optimized out>)
    at ../../gnuplot/src/plot.c:694
694         return exit_status;
(gdb) n
695     }
(gdb) n
0x61007acf in cygwin_exit_return () from /usr/bin/cygwin1.dll
(gdb) c
Continuing.

Breakpoint 3, debug_exit_handler () at ../../gnuplot/src/stdfn.c:461
461         if (exit_handlers) {
(gdb) p exit_handlers
$1 = (struct EXIT_HANDLER *) 0x0
(gdb) c
Continuing.
[Thread 8120.0x1708 exited with code 0]
[Thread 8120.0x26b8 exited with code 0]
[Thread 8120.0x1094 exited with code 0]
[Thread 8120.0x27cc exited with code 0]
[Thread 8120.0x22c8 exited with code 0]
[Inferior 1 (process 8120) exited normally]


The above also happens on lubuntu.

Similar behavior is observed on windows


Entering exit command 
gp_exit_cleanup () is called in main in plot.c on Cygwin and lubuntu. 
gp_exit_cleanup () is called in WinMain (wgnuplot) or main (gnuplot) in wimmain.c on windows. 


Even exit command, gp_exit() seems not to be used.

Is 

*****************************

Normally gnuplot should be exited using gp_exit().
***************************

true at present ?

Tatsuro