[Gambas-bugtracker] Bug #2310: Gambas Apps have isssues talking to other gambas apps started with exec

[bugtracker at gambaswiki.org]

http://gambaswiki.org/bugtracker/edit?object=BUG.2310&from=L21haW4-

Brian G reported a new bug.

Summary
-------

Gambas Apps have isssues talking to other gambas apps started with exec

Type             : Bug
Priority         : High
Gambas version   : Master
Product          : Language


Description
-----------

While testing the different methods for starting a script I was unable to write to an exec started script.. sometimes

So I created two test apps and found the same thing. Unable to send to an exec started gambas app with syntax

myproc = exec ["myapp"] for read write as "atest" 
write #myproc, "this string"

I actually tried many ways of sending data to gambas apps
but this works just fine with every other linux app

Given the bash script line  
      echo "Hello world" |  mycat.gambas | less

MyCat is a gambas app and this works just fine reads stdin and writes to stdout exits when eof() is reached i.e. echo terminates

Given the bash script line
     mycat.gambas < somefile

As an aside This fails as no application_read event is raised when the app starts... have to do a check and read manually.

The MYCat project is attached.

Given then when the gambas app is executed by another gambas app, it does not work at all
Data is not received or written to stdout, or the logfile generated by mycat.

The project Attached TestWriteReadFromApp , trys to exec mycat, does two things.

1) it execs cat sends some data gets the data back and prints it, works fine

2) it execs mycat.gambas sends some data, never gets any response and mycat never actually seems to receives it.

Maybe I am doing something wrong!


System information
------------------

[System]
Gambas=3.16.90 e08d47dd0 (master)
OperatingSystem=Linux
Kernel=5.11.0-22-generic
Architecture=x86_64
Distribution=Linux Mint 20.1 Ulyssa
Desktop=MATE
Font=Ubuntu,10
Scale=7
Theme=mint-y
Language=en_US.UTF-8
Memory=14011M

[Libraries]
Cairo=libcairo.so.2.11600.0
Curl=libcurl.so.4.6.0
DBus=libdbus-1.so.3.19.11
GDK2=libgdk-x11-2.0.so.0.2400.32
GDK3=libgdk-3.so.0.2404.16
GStreamer=libgstreamer-1.0.so.0.1602.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2404.16
OpenGL=libGL.so.1.7.0
Poppler=libpoppler.so.97.0.0
QT5=libQt5Core.so.5.12.8
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
CLUTTER_BACKEND=x11
COMPIZ_CONFIG_PROFILE=mint
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
DESKTOP_SESSION=mate
DISPLAY=:0
EDITOR=/usr/bin/nano
GB_GUI=gb.gtk3
GDMSESSION=mate
GDM_LANG=en_US
GIO_LAUNCHED_DESKTOP_FILE_PID=2640189
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GTK3_MODULES=xapp-gtk3-module
GTK_MODULES=gail:atk-bridge
GTK_OVERLAY_SCROLLING=0
HOME=<home>
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_ALL=en_US.UTF-8
LOGNAME=<user>
MATE_DESKTOP_SESSION_ID=this-is-deprecated
PATH=<home>/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
PWD=<home>
QT_ACCESSIBILITY=1
QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_LOGGING_RULES=*.debug=false
QT_QPA_PLATFORMTHEME=qt5ct
QT_SCALE_FACTOR=1
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/2632950,unix/<hostname>:/tmp/.ICE-unix/2632950
SHELL=/bin/bash
SHLVL=0
SSH_AGENT_PID=2633087
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
TERM=xterm
TZ=:/etc/localtime
USER=<user>
XAUTHORITY=<home>/.Xauthority
XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg
XDG_CURRENT_DESKTOP=MATE
XDG_DATA_DIRS=/usr/share/mate:<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=mate
XDG_SESSION_ID=c6
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session2
XDG_SESSION_TYPE=x11
XDG_VTNR=7