From the creator of BaCon - gtk-server

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technosaurus · #21 Post by **technosaurus** » Wed 12 Oct 2011, 04:20

I posted a pet and a tarball with a bunch of fixed up examples about the time 2.3.1 came out here:
http://murga-linux.com/puppy/viewtopic. ... 947#388947

I do recommend installing findutils though for the examples.

I'm interested in trying to use it for SDL, has anyone seen an sdl config file?

jamesbond · #22 Post by **jamesbond** » Wed 12 Oct 2011, 04:45

technosaurus wrote:I posted a pet and a tarball with a bunch of fixed up examples about the time 2.3.1 came out here:
http://murga-linux.com/puppy/viewtopic. ... 947#388947

I do recommend installing findutils though for the examples.

I'm interested in trying to use it for SDL, has anyone seen an sdl config file?

Google failed me, it didn't find your original post when I searched for it. Otherwise I wouldn't have published this as a new thread

What's the findutils for?

sunburnt · #23 Post by **sunburnt** » Wed 12 Oct 2011, 05:54

Unfortunately, that wouldn't help bash 3 users, of which I am currently one (using Puppy Wary).

Do I smell an SFS file in the making?
I think most Linuxes will be into Bash 4 shortly, so not really much of a problem.

###> BASH update:

Lucid 5.25 is the most leading-edge Lucid ever and a Five Digit Update from Lucid 5.2.
It has Bash 4.1.0, an upgrade from Bash 3

technosaurus · #24 Post by **technosaurus** » Wed 12 Oct 2011, 06:29

jamesbond wrote:
technosaurus wrote:I posted a pet and a tarball with a bunch of fixed up examples about the time 2.3.1 came out here:
http://murga-linux.com/puppy/viewtopic. ... 947#388947

I do recommend installing findutils though for the examples.

I'm interested in trying to use it for SDL, has anyone seen an sdl config file?
Google failed me, it didn't find your original post when I searched for it. Otherwise I wouldn't have published this as a new thread
What's the findutils for?

I'm glad someone started a separate thread.

findutils is for loading images and libraries (updatedb and locate are the specific binaries iirc)

mcewanw · #25 Post by **mcewanw** » Wed 12 Oct 2011, 08:59

jamesbond wrote:If you can get this to work, it would be interesting. I don't like to trap SIGINT while the script is waiting to read the pipe - I'll end up having to kill both the scripts and the gtk-server manually :?

The one required to use gtk-server most efficiently from bash...

Working gtk-server -stdin example, using coproc. You need bash version 4+ for this so won't work in current Puppy Wary I think.

Took a while, but finally got it going (using Lucid 5.2.5). Not heavily tested though, but runs very fast on this old Pentium III 256 MB machine. Probably a couple of extra lines required to tidy up after the coproc complete (maybe need to free up used file descriptors, but maybe done automatically):

Code: Select all

#!/bin/bash
# Bourne shell gtk-server stdin demo using bash ver4 coproc cmd
#   for the message communications with gtk-server
#
# Creation date (YMD): 2011/10/12 (original version 1.0.0)                                       
# Revision date (YMD): 2011/10/12
# (C) Copyright 2011 William McEwan (http://wiak.org); GPL
#
# Using code from Bourne shell named pipe demo with the GTK-server
# by Peter van Eerten; Revision January 15, 2007
#------------------------------------------------

# Communicate with GTK-server
gtk()
{
  # send the gtk string to gtk-server
  echo "$@" >&${COPROC[1]}
  # receive the gtk-server return string into RESULT
  read -u ${COPROC[0]} RESULT
}

# Main starts here

# Start gtk-server in stdin mode
coproc gtk-server -stdin

# Setup GUI
gtk "gtk_init NULL NULL"
gtk "gtk_window_new 0"
WIN=$RESULT
gtk "gtk_window_set_title $WIN 'BASH GTK-server demo'"
gtk "gtk_window_set_default_size $WIN 400 200"
gtk "gtk_window_set_position $WIN 1"
gtk "gtk_table_new 10 10 1"
TBL=$RESULT
gtk "gtk_container_add $WIN $TBL"
gtk "gtk_button_new_with_label 'Click to Quit'"
BUT=$RESULT
gtk "gtk_table_attach_defaults $TBL $BUT 5 9 5 9"
gtk "gtk_widget_show_all $WIN"

EVENT=0

# Mainloop
while [[ $EVENT -ne $BUT && $EVENT -ne $WIN ]]
do
    gtk "gtk_server_callback WAIT"
    EVENT=$RESULT
done

# Exit GTK-server
gtk "gtk_server_exit"
exit 0

jamesbond · #26 Post by **jamesbond** » Thu 13 Oct 2011, 23:31

Thanks mcewannw. This works well. (Fatdog comes with bash4 so bash4 isn't a problem).

cheers!

technosaurus · #27 Post by **technosaurus** » Fri 14 Oct 2011, 06:21

the musl libc wrapper has a coproc-like replacement that should work with even busybox ash
http://git.etalabs.net/cgi-bin/gitweb.c ... sh;hb=HEAD

I was pretty sure I was using busybox ash before, but not sure what method I used, I haven't used it in a while (determined it was easier to just use C with tcc in compile and run mode - yes C is a scriptable language now)

also MU made a glade project builder for gtk-server
http://www.murga-linux.com/puppy/viewtopic.php?t=60705

mcewanw · #28 Post by **mcewanw** » Sun 16 Oct 2011, 19:00

technosaurus wrote:the musl libc wrapper has a coproc-like replacement that should work with even busybox ash
http://git.etalabs.net/cgi-bin/gitweb.c ... sh;hb=HEAD

This sounds interesting if it can replace coproc. Can you enlighten me on this code? I don't see what it does or how to use it instead of coproc.

technosaurus · #29 Post by **technosaurus** » Sun 16 Oct 2011, 20:28

This is the section I was referring to:

Code: Select all

[ "$nolink" ] || {
tmp_specs=$HOME/.specs.tmp.$$
printf '*link_libgcc:\n\n\n' > "$tmp_specs" || exit 1
exec 3<"$tmp_specs"
rm -f "$tmp_specs"
set -- -specs=/proc/self/fd/3 "$libc_start" "$libc_crt" "$@" "$libc_end" \
  -Wl,--start-group -lc -lgcc -lgcc_eh -Wl,--end-group \
  -Wl,-dynamic-linker,"$ldso_pathname" -Wl,-nostdlib
}

I don't fully understand it myself, but when I read the coproc manpage, this was what immediately came to mind... maybe my gut is lying to me, but this is what I _think_ is going on in the wrapper:

sets up a file in /root/.specs.tmp.<Random#>
with the contents:
"*link_libgcc:

"
then:
exec 3 /root/.specs.tmp.<Random#>
establishes a new process in /proc/self/fd/3 and the original file can be removed and the process can be used

mcewanw · #30 Post by **mcewanw** » Sun 16 Oct 2011, 23:14

technosaurus wrote: then:
exec 3 /root/.specs.tmp.<Random#>
establishes a new process in /proc/self/fd/3 and the original file can be removed and the process can be used

Not sure about this. I have written a C prog before that started two processes with a pipe between then (redirecting stdins and stdouts appropriately). Its trickyish to do, and I might have trouble understanding my own code so many years later... I'm not entirely sure if I could communicate with gtkserver via that or not. Lots of interesting things going on just now... alas that means "so many things to do..."

I've also just installed gtk-server on my Windows box at work too, though still to use it for anything there. I want to try it for something I need to do at work, where they don't use Linux. But I'd love to introduce some programmer work colleagues to gtk interface anyway one way or the other.

DocSalvage · #31 Post by **DocSalvage** » Sat 27 Jul 2013, 17:29

Though this is a very old thread, let me just add that it bash 4 confuses things even more as it adds support for '|&' but it doesn't mean the same thing. It is shorthand for '2>&1 |'.

The '<>' operator creates a bidirectional pipe.

See...
http://wiki.bash-hackers.org/syntax/redirection
http://wiki.bash-hackers.org/howto/redirection_tutorial
http://www.tldp.org/LDP/abs/html/io-redirection.html

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From the creator of BaCon - gtk-server