[Gambas-user] pigpio c library callback gives segmentation fault (11)

[Jussi Lahtinen]

Wait, your callback function is not function!

Jussi

On Tue, Nov 13, 2018 at 2:11 AM Steve via User <user at lists.gambas-basic.org>
wrote:

> I turned the pigipod_if2.c function set into a shared library that
> Gambas3 found acceptable for use with Extern statement.
>
> In general the functions work fine. The connected hardware is accessed
> and properly manipulated.
>
> However one of the functions needs a callback. When the callback is
> triggered a segmentation fault occurs. Generally this means to me that
> the address being passed is invalid and an attempt was made to go
> outside user space.
>
> The gambas documentation says it should work. Is there something special
> I need to do?
>
> tia
>
> Code below
>
> Library "/home/pi/Desktop/PigpioLib/libpigpiod_if2"
>
> Extern callback(aPi As Integer, user_gpio As Integer, int_edge As
> Integer, func As Pointer) As Integer
>
> Public sub main_load
>
> iGpio_CB_Left = callback(iPi, 23, 0, Callback_Left)
> End
>
> Public sub callback_left(igpio as integer, istate as integer, itick as
> integer)
>
> ...
>
> End
>
> [System]
> Gambas=3.9.1
> OperatingSystem=Linux
> Kernel=4.14.50-v7+
> Architecture=armDistribution=debian 9.4
> Desktop=LXDE
> Theme=Qt5CTProxy
> Language=en_US.UTF-8
> Memory=927M
>
> [Libraries]
> Cairo=libcairo.so.2.11400.8
> Curl=libcurl.so.4.4.0
> DBus=libdbus-1.so.3.14.15
> GStreamer=libgstreamer-0.10.so.0.30.0
> GStreamer=libgstreamer-1.0.so.0.1004.0
> GTK+2=libgtk-x11-2.0.so.0.2400.31
> GTK+3=libgtk-3.so.0.2200.11
> OpenGL=libGL.so.1.2.0
> Poppler=libpoppler.so.64.0.0
> QT5=libQt5Core.so.5.7.1
> SDL=libSDL-1.2.so.0.11.4
> SQLite=libsqlite3.so.0.8.6
>
> [Environment]
> DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
> DESKTOP_SESSION=LXDE-<user>
> DISPLAY=:0.0
> GB_GUI=gb.qt5
> GDMSESSION=lightdm-xsession
> GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
> HOME=<home>
> INFINALITY_FT_AUTOHINT_HORIZONTAL_STEM_DARKEN_STRENGTH=10
> INFINALITY_FT_AUTOHINT_INCREASE_GLYPH_HEIGHTS=true
> INFINALITY_FT_AUTOHINT_SNAP_STEM_HEIGHT=100
> INFINALITY_FT_AUTOHINT_VERTICAL_STEM_DARKEN_STRENGTH=25
> INFINALITY_FT_BOLD_EMBOLDEN_X_VALUE=0
> INFINALITY_FT_BOLD_EMBOLDEN_Y_VALUE=0
> INFINALITY_FT_BRIGHTNESS=0
> INFINALITY_FT_CHROMEOS_STYLE_SHARPENING_STRENGTH=0
> INFINALITY_FT_CONTRAST=0
> INFINALITY_FT_FILTER_PARAMS=11 22 38 22 11
> INFINALITY_FT_FRINGE_FILTER_STRENGTH=0
> INFINALITY_FT_GAMMA_CORRECTION=0 100
> INFINALITY_FT_GLOBAL_EMBOLDEN_X_VALUE=0
> INFINALITY_FT_GLOBAL_EMBOLDEN_Y_VALUE=0
> INFINALITY_FT_GRAYSCALE_FILTER_STRENGTH=0
> INFINALITY_FT_STEM_ALIGNMENT_STRENGTH=25
> INFINALITY_FT_STEM_FITTING_STRENGTH=25
> INFINALITY_FT_STEM_SNAPPING_SLIDING_SCALE=40
> INFINALITY_FT_USE_KNOWN_SETTINGS_ON_SELECTED_FONTS=true
> INFINALITY_FT_USE_VARIOUS_TWEAKS=true
> INFINALITY_FT_WINDOWS_STYLE_SHARPENING_STRENGTH=10
> LANG=en_US.UTF-8
> LANGUAGE=en_US.UTF-8
> LC_ALL=en_US.UTF-8
> LOGNAME=<user>
>
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games
> PWD=<home>
> QT_QPA_PLATFORMTHEME=qt5ct
> SAL_USE_VCLPLUGIN=gtk
> SHELL=/bin/bash
> SSH_AGENT_PID=614
> SSH_AUTH_SOCK=/tmp/ssh-oBISTq0a0BrD/agent.489
> TEXTDOMAIN=Linux-PAM
> TZ=:/etc/localtime
> USER=<user>
> XAUTHORITY=<home>/.Xauthority
> XDG_CONFIG_DIRS=/etc/xdg
> XDG_CONFIG_HOME=<home>/.config
> XDG_CURRENT_DESKTOP=LXDE
>
> XDG_DATA_DIRS=/usr/local/share:/usr/share/ras<user>-ui-overrides:/usr/share:/usr/share/gdm:/var/lib/menu-xdg
> XDG_GREETER_DATA_DIR=/var/lib/lightdm/data/<user>
> XDG_MENU_PREFIX=lxde-<user>-
> XDG_RUNTIME_DIR=/run/user/1000
> XDG_SEAT=seat0
> XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
> XDG_SESSION_DESKTOP=lightdm-xsession
> XDG_SESSION_ID=c1
> XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
> XDG_SESSION_TYPE=x11
> XDG_VTNR=7
> _LXSESSION_PID=489
>
>
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>
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