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by swampdog
Fri Jul 26, 2019 9:07 am
Forum: Raspbian
Topic: Help please: serially connected to RPi zero help configure terminal
Replies: 1
Views: 100

Re: Help please: serially connected to RPi zero help configure terminal

I use minicom on a zero with a serial adapter to connect to various linux machines. The minicom settings are.. +-----------------------------------------------------------------------+ | A - Serial Device : /dev/serial0 | | B - Lockfile Location : /var/lock | | C - Callin Program : | | D - Callout P...
by swampdog
Fri Jul 26, 2019 8:49 am
Forum: C/C++
Topic: StdLib Dirty Replacement Functions:
Replies: 20
Views: 965

Re: StdLib Dirty Replacement Functions:

The trouble these days with trying to beat the compiler is they're pretty clever now. Take your StrCpy(), slightly modified old-school.. char* StrCpy(register char *d, register const char *s) { register char *r=d; while (*d++ = *s++); return r; } (gcc -c sc.c && objdump -d sc.o) The above isn't supp...
by swampdog
Thu Jul 25, 2019 12:14 pm
Forum: C/C++
Topic: How to catch Unhandled exceptions
Replies: 10
Views: 467

Re: How to catch Unhandled exceptions

You've already got it, ::write() returning <0 (man 2 write). None of the above raise C++ exceptions so without complete compilable code demonstrating the problem it's difficult to help further. Note also it isn't possible to check in the manner you do.. if (IsConnectedSocket(...)) //say it returns t...
by swampdog
Wed Jul 24, 2019 9:32 pm
Forum: Advanced users
Topic: Using all 4gb ram with one process
Replies: 16
Views: 713

Re: Using all 4gb ram with one process

I know nothing of minecraft but what about the possibility of running a pair of servers on the pi? Whilst very quickly googling if this is possible (I can't tell) I spotted this link..


https://www.spigotmc.org/wiki/about-bungeecord/


..meaningless to me, hopefully not to you.
by swampdog
Wed Jul 24, 2019 7:57 am
Forum: C/C++
Topic: How to catch Unhandled exceptions
Replies: 10
Views: 467

Re: How to catch Unhandled exceptions

@norc89 As @Heater said, we need to know more. ::write() can't throw an exception so the next candidate is it comes from IsConnectedSocket() and that it doesn't raise std::exception. Remove the __try/__catch block and instead add.. catch (...) { //unhandled exception message } ^^^after "catch (std::...
by swampdog
Tue Jul 23, 2019 7:37 pm
Forum: C/C++
Topic: How to catch Unhandled exceptions
Replies: 10
Views: 467

Re: How to catch Unhandled exceptions

I've never used gnu __try/__catch myself but I understood it to be used by "-fno-exceptions" and translates "__try" from "try" to "if (true)" and "__catch" from "catch" to "if (false)". If my understanding is correct then the inner "try/catch" makes no sense in the context of the outer __try/__catch...
by swampdog
Mon Jul 22, 2019 10:23 pm
Forum: C/C++
Topic: How to catch Unhandled exceptions
Replies: 10
Views: 467

Re: How to catch Unhandled exceptions

I could be wrong - it's been years since I programmed a windows box but isn't that MSVC code? That __try/__catch block looks like one of those M$ structured C exceptions (or whatever they're called).
by swampdog
Mon Jul 22, 2019 9:56 pm
Forum: Troubleshooting
Topic: rsync - works from terminal but not as cron???
Replies: 33
Views: 801

Re: rsync - works from terminal but not as cron???

This all seems to be getting very complicated! First off, put what you want to do in a script. eg: a normal cronjob on one of my pi's.. [email protected]:~ $ crontab -l PATH=/usr/local/sd/bin:/$HOME/bin:/bin:/usr/bin:$PATH #------------------------------------------------------------------------------ #min...
by swampdog
Sat Jul 20, 2019 5:59 pm
Forum: Advanced users
Topic: Problems exporting an NFS share
Replies: 5
Views: 248

Re: Problems exporting an NFS share

Have you considered iscsi for the "NFS server" pi's? Each presents a disk to the "head" pi and only NFS export from the "head". It would be a pain to attempt. The obvious caveat is the (now) "ISCSI target" (aka "NFS server") pi's would have to be guaranteed to be up and each would have to be up befo...
by swampdog
Tue Jul 16, 2019 1:32 am
Forum: C/C++
Topic: I dont get it... Why is everyone from science schools so obsessed with Perl and Python when we got C?
Replies: 303
Views: 10370

Re: I dont get it... Why is everyone from science schools so obsessed with Perl and Python when we got C?

Fwiw, GEM from Digital Research (aka early Mac and Atari ST) GUI used pointers. Each graphical OBJECT had two pointers, "head" and "tail" which would point to the first OBJECT of the current OBJECT's child node and last OBJECT child node respectively plus a "next" pointer which would point to the ne...
by swampdog
Mon Jul 15, 2019 11:27 pm
Forum: Beginners
Topic: how to copy 1 external SD to another external SD?
Replies: 28
Views: 1396

Re: how to copy 1 external SD to another external SD?

The command line will help you diagnose. $ sudo apt-get install lsscsi usbutils parted You can now "lsscsi" and "lsusb". Note I've only got one of these usb/sdcard dongles and I'm doing this under Linux Mint (no rpi to hand) but the principle is the same. What happens when you plug one in? ... $ sud...
by swampdog
Fri Jun 14, 2019 8:23 pm
Forum: General discussion
Topic: script problem (again) - scratching my head...
Replies: 9
Views: 527

Re: script problem (again) - scratching my head...

'shellcheck' does look quite useful. I'm amazed I've gone all these years without knowing of it. It can't do any harm to run it and because you can disable warnings to taste you can see the wood for the trees. In my case, SC2006, depreciated backticks rather than $(..), and it's not to know I delibe...
by swampdog
Fri Jun 07, 2019 10:39 am
Forum: C/C++
Topic: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’
Replies: 24
Views: 2428

Re: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’

@Paeryn
swampdog, dsylexia123 is compiling the code as C++, not C (the clue is in the error message :roll: )
Doh!

I did similar at work once. "What [insert flowery language] wrote this pile of [insert flowery language]?". (silence). "It was me, wasn't it?".

I've always loved The Clangers! :-)
by swampdog
Thu Jun 06, 2019 10:13 pm
Forum: C/C++
Topic: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’
Replies: 24
Views: 2428

Re: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’

The code you posted does not produce the error. I don't know what the Geany preferences are but from the (gcc 4.9.2) command line.. [email protected]:/wrk/T $ gcc -o c -Wall -pedantic a.c -lpthread -lwiringPi a.c:16:55: warning: C++ style comments are not allowed in ISO C90 int16_t strstrpos(char * haystac...
by swampdog
Thu Jun 06, 2019 9:57 pm
Forum: General discussion
Topic: script problem (again) - scratching my head...
Replies: 9
Views: 527

Re: script problem (again) - scratching my head...

@hortimech #!/bin/dash ? ;-) Shell script portability is a nightmare because you're reduced to using bourne shell (aka #!/bin/sh) and once you get complex enough to be pulling in sub scripts it becomes a royal pita. There's so many pitfalls that its either best (a) not to bother (b) install the same...
by swampdog
Thu Jun 06, 2019 2:47 pm
Forum: C/C++
Topic: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’
Replies: 24
Views: 2428

Re: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’

You're going to have to post short complete compilable code (and gcc compile options) which demonstrates the issue. We can then figure out where you're getting confused. ;-)
by swampdog
Thu Jun 06, 2019 1:20 am
Forum: General discussion
Topic: script problem (again) - scratching my head...
Replies: 9
Views: 527

Re: script problem (again) - scratching my head...

#!/bin/bash ^^^ no ! (bang) in yours. if [ -z "$2" ]; then kodiflag="$2" ^^^if nul then set nul? I tend to use the same basic template.. #!/bin/bash NAM=`basename "$0"` fcp_usage () { cat<<EOF ${NAM}: [ --help | -h ] ${NAM}: [ start | 1 ] ${NAM}: [ stop | 0 ] ${NAM}: [ foo ] [arg1] [arg2] EOF } fcp_...
by swampdog
Thu Jun 06, 2019 12:02 am
Forum: C/C++
Topic: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’
Replies: 24
Views: 2428

Re: avoid compile warnings about ISO C++ forbids converting a string constant to ‘char*’

Appearently I cannot have both ways optionally, arbitrarily, simultaneously. It's because you're inadvertently attempting to remove the "constness". Back in the bad of days of K&R compilers what you are attempting was perfectly possible and the source of maddening bugs. I could write this.. "token"...
by swampdog
Sat May 11, 2019 7:07 pm
Forum: Raspbian
Topic: tar destroys directories
Replies: 5
Views: 388

Re: tar destroys directories

oops! Realised I forgot to add something then hit [submit].(*) $sudo -i tar --no-same-owner --no-same-permissions -C / sdl-raspberrypi-3085.tar.xz ..might do the job (so long since I've used them but I suspect 'sudo -i' is important for the umask etc) but this is likely better off done via "sudo su ...
by swampdog
Sat May 11, 2019 6:41 pm
Forum: Raspbian
Topic: tar destroys directories
Replies: 5
Views: 388

Re: tar destroys directories

UNIX/Linux noob of over 30 years!!! But I'm really new to Raspbian! So how does this happen. ..because you're a very naughty veteran linux noob! $ tar --numeric-owner -tvJf /wrk/sdl-raspberrypi-3085.tar.xz |head drwx------ 126/133 0 2019-04-25 22:18 usr/ drwx------ 126/133 0 2019-04-25 22:18 usr/lo...
by swampdog
Sat May 04, 2019 12:05 pm
Forum: General discussion
Topic: Install Qt5 On Raspberry Pi2
Replies: 21
Views: 36937

Re: Install Qt5 On Raspberry Pi2

@Heater

Unfortunately no. It's proprietary. A previous employer sold my code. It ended up in the hands of a US antivirus company of which I cannot speak due to an NDA.

I haven't got round to rewriting it.
by swampdog
Sat May 04, 2019 9:01 am
Forum: C/C++
Topic: Creating a Raspberry Pi program in Qt Creator
Replies: 25
Views: 2569

Re: Creating a Raspberry Pi program in Qt Creator

Has someone got 2G of public space?

I have a debug build of QT 5.12.1. QtCreator 4.8.1.
by swampdog
Sat May 04, 2019 8:35 am
Forum: General discussion
Topic: Install Qt5 On Raspberry Pi2
Replies: 21
Views: 36937

Re: Install Qt5 On Raspberry Pi2

It's "do-able". I have QT 5.12.1 built and QtCreator 4.8.1. Works fine.
by swampdog
Tue Apr 30, 2019 9:12 pm
Forum: Beginners
Topic: Deleting 'pi' user
Replies: 8
Views: 3916

Re: Deleting 'pi' user

Fwiw, I just 'sudo passwd -l pi' (lock) the "pi" user account.
by swampdog
Wed Apr 24, 2019 5:14 pm
Forum: C/C++
Topic: GCC 6 Cross Compiler
Replies: 15
Views: 5282

Re: GCC 6 Cross Compiler

@AdamStanislav

If you can provide details of a public server, I'll upload it there.

Unfortunately for all of us, I do intend to create one/both of github/website but my time isn't my own so any new tasks have to wait.

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