[bug #62030] 'Malformed xchar' error, if fork'ed child throws

[Stephan Rudlof]

URL:
  <https://savannah.gnu.org/bugs/?62030>

                 Summary: 'Malformed xchar' error, if fork'ed child throws
                 Project: Gforth
            Submitted by: hartrock
            Submitted on: Fri 11 Feb 2022 01:57:19 AM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

System info:
+++
sr@rs:~/Gforth$ ../gforth/gforth --version
gforth 0.7.9_20220210 amd64
sr@rs:/usr/local/share/gforth$ uname -a
Linux rs 4.19.0-18-amd64 #1 SMP Debian 4.19.208-1 (2021-09-29) x86_64
GNU/Linux
+++

This triggers the error:
+++
: baz
    fork
    if \ child pid -> parent, or ..
    else \ .. 0 -> child
        \ needed to get normally working terminal (after finishing child)
        stdin close-file throw \ or 'sh stty -icanon' in parent bye...
        stdout close-file throw
        history-cold
        1 throw
        bye
    then
;
baz
+++
as endless loop:
+++
...
kernel/int.fs:658:5:                     5 $7FADAF4B4EA0 bt-rp0-catch 
*the terminal*:1:1: error: Malformed xchar
>>>÷z<<<
Backtrace:
kernel/input.fs:216:30:                  0 $7FADAF4C0438 throw 
kernel/input.fs:216:36:                  1 $7FADAF4B5348 get-input-colored 
except.fs:83:2:                          2 $7FADAF4CBDD8 execute  [catch
frame]
kernel/int.fs:654:5:                     3 $7FADAF4B4E38 catch 
                                         4 $7FADAF0E3FC0 
kernel/int.fs:658:5:                     5 $7FADAF4B4EA0 bt-rp0-catch 
*the terminal*:1:1: error: Malformed xchar
>>>÷z<<<
Backtrace:
kernel/input.fs:216:30:                  0 $7FADAF4C0438 throw 
kernel/input.fs:216:36:                  1 $7FADAF4B5348 get-input-colored 
except.fs:83:2:                          2 $7FADAF4CBDD8 execute  [catch
frame]
kernel/int.fs:654:5:                     3 $7FADAF4B4E38 catch 
                                         4 $7FADAF0E3FC0 
kernel/int.fs:658:5:                     5 $7FADAF4B4EA0 bt-rp0-catch 
*the terminal*:1:1: error: Malformed xchar
>>>÷z<<<
Backtrace:
kernel/input.fs:216:30:                  0 $7FADAF4C0438 throw 
kernel/input.fs:216:36:                  1 $7FADAF4B5348 get-input-colored 
except.fs:83:2:                          2 $7FADAF4CBDD8 execute  [catch
frame]
kernel/int.fs:654:5:                     3 $7FADAF4B4E38 catch 
                                         4 $7FADAF0E3FC0 
kernel/int.fs:658:5:                     5 $7FADAF4B4EA0 bt-rp0-catch 
*the terminal*:1:1: error: Malformed xchar
>>>÷z<<<
...
+++

Notes:
- fork() gotten by
+++
\c #include <sys/types.h>
\c #include <unistd.h>
c-function fork fork -- n ( -- u )
+++
, and working as expected.

- Distribution gforth 0.7.3 not triggering above bug.




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