Re: GNUstep app fails on Ubuntu 16 shmget() related

[Andreas Höschler]

Hi all

I have retried my application under art. When I open one of the problematic forms I now get 

2020-05-06 18:43:11.295 SOObjectBrowser[8177:8177] File NSView.m: 1183. In -[NSView setFrame:] given negative width

2020-05-06 18:43:11.295 SOObjectBrowser[8177:8177] File NSView.m: 1188. In -[NSView setFrame:] given negative height

2020-05-06 18:43:11.384 SOObjectBrowser[8177:8177] Warning: shmget() failed: Invalid argument.

2020-05-06 18:43:11.384 SOObjectBrowser[8177:8177] Falling back to normal XImage (will be slower).

2020-05-06 18:43:11.384 SOObjectBrowser[8177:8177] Warning: failed to create image for window!

2020-05-06 18:43:11.387 SOObjectBrowser[8177:8177] Warning: shmget() failed: Invalid argument.

2020-05-06 18:43:11.387 SOObjectBrowser[8177:8177] Falling back to normal XImage (will be slower).

2020-05-06 18:43:11.387 SOObjectBrowser[8177:8177] Warning: failed to create image for window!

2020-05-06 18:43:12.696 SOObjectBrowser[8177:8177] X-Windows error - BadAlloc (insufficient resources for operation)

          on display: :0

                type: 0

       serial number: 21442

        request code: 130

2020-05-06 18:43:12.697 SOObjectBrowser[8177:8177] X-Windows error - BadPixmap (invalid Pixmap parameter)

          on display: :0

                type: 0

       serial number: 21443

        request code: 2

and the app fails (hangs).

My code works on MacOSX and used to work on older GNUstep releases. This of course does not mean much. There could still be a problem that is tolerated by the other two environments. I will try to figure out where this "given negative ..." stuff comes from. However, if this already rings any bells I would be glad to hear your suggestions. 

I figured (rather guessed) that this has nothing to do with 

2020-05-06 18:43:11.295 SOObjectBrowser[8177:8177] File NSView.m: 1183. In -[NSView setFrame:] given negative width

2020-05-06 18:43:11.295 SOObjectBrowser[8177:8177] File NSView.m: 1188. In -[NSView setFrame:] given negative height

but rather with 

2020-05-06 18:43:11.384 SOObjectBrowser[8177:8177] Warning: shmget() failed: Invalid argument.

shmget is not used by gui but by the backend.

/usr/src/GNUstep/libs-back# grep -r "shmget" .

./Source/x11/XWindowBuffer.m:    shminfo.shmid = shmget(IPC_PRIVATE,

./Source/x11/XWindowBuffer.m:        NSLog(@"XShm not supported, shmget() failed: %m.");

./Source/x11/XWindowBuffer.m:      wi->shminfo.shmid = shmget(IPC_PRIVATE,

./Source/x11/XWindowBuffer.m:          NSLog(@"Warning: shmget() failed: %m.");

./Source/x11/xutil.c: rximg->info.shmid = shmget(IPC_PRIVATE, 

I get lost here. Any idea?

Thanks,

  Andreas