[Gambas-user] gbx3, how and where to handle POLLHUP event ?

[Peter Bauer]

Hello,
In which source file does gbx handle poll() callbacks to watch open files ?

High CPU load and fast repeating output from strace attached to gbx3
process:
poll([ {fd= 6, events = POLLIN}, {fd= 7, events = POLLIN}, {fd= 8, events =
POLLIN |POLLPRI}, {fd=13, events=POLLIN}], 4, 989) = 1 ([{fd=13,
revents=POLLHUP}])

Gambas example:
https://gambas.one/gambasfarm/?id=761&action=search
(must be run from a terminal to show the issue,issue not visible in gambas
IDE !)

I would like to look if it is possible to handle an incoming pipe when the
sender
process has ended. In this case the pipe should no longer be watched and
just be closed and/or an error should be thrown. I found a C source code
example for this:
https://stackoverflow.com/questions/5857461/how-to-use-the-poll-c-function-to-watch-named-pipes-in-linux/44126952#44126952

[System]
Gambas=3.14.90 a59dfb169 (master)
OperatingSystem=Linux
Kernel=4.15.0-88-generic
Architecture=x86_64
Distribution=Ubuntu 18.04.4 LTS
Desktop=MATE
Theme=Fusion
Language=en_US.UTF-8
Memory=15868M

[Libraries]
Cairo=libcairo.so.2.11510.0
Curl=libcurl.so.4.5.0
DBus=libdbus-1.so.3.19.4
GStreamer=libgstreamer-1.0.so.0.1405.0
GTK+2=libgtk-x11-2.0.so.0.2400.32
GTK+3=libgtk-3.so.0.2200.30
OpenGL=libGL.so.1.0.0
Poppler=libpoppler.so.57.0.0
Poppler=libpoppler.so.73.0.0
QT4=libQtCore.so.4.8.7
QT5=libQt5Core.so.5.9.5
SDL=libSDL-1.2.so.0.11.4
SQLite=libsqlite3.so.0.8.6

[Environment]
COMPIZ_CONFIG_PROFILE=mate
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-xW4AH1pxYD,guid=78dee8a13ae9ae16412773225e6b56da
DESKTOP_SESSION=mate
DISPLAY=:0
GB_GUI=gb.qt5
GDMSESSION=mate
GDM_LANG=en
GIO_LAUNCHED_DESKTOP_FILE=<home>/Schreibtisch/Gambas3.desktop
GIO_LAUNCHED_DESKTOP_FILE_PID=7578
GTK_OVERLAY_SCROLLING=0
HOME=<home>
INSIDE_CAJA_PYTHON=
JAVA_HOME=/usr/lib/jvm/java-8-oracle
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_ADDRESS=de_AT.UTF-8
LC_ALL=en_US.UTF-8
LC_IDENTIFICATION=de_AT.UTF-8
LC_MEASUREMENT=de_AT.UTF-8
LC_MONETARY=de_AT.UTF-8
LC_NAME=de_AT.UTF-8
LC_NUMERIC=de_AT.UTF-8
LC_PAPER=de_AT.UTF-8
LC_TELEPHONE=de_AT.UTF-8
LC_TIME=de_AT.UTF-8
LOGNAME=<user>
MATE_DESKTOP_SESSION_ID=this-is-deprecated
PAPERSIZE=a4
PATH=<home>/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/lib/node_modules/:<home>/rakudo/rakudo-2020.01/bin/:<home>/bin:<home>/rakudo/rakudo-2020.01/share/perl6/site/bin:<home>/rakudo/rakudo-2020.01/
PWD=<home>
QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_LOGGING_RULES=*.debug=false
QT_SCALE_FACTOR=1
SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/5255,unix/<hostname>:/tmp/.ICE-unix/5255
SHELL=/bin/bash
SHLVL=0
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
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:/usr/local/share:/usr/share:/var/lib/snapd/desktop
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_DESKTOP=mate
XDG_SESSION_ID=c2
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
XDG_SESSION_TYPE=x11
XDG_VTNR=7


Best Regards,
Peter Bauer
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