1 day ago · Firefox source code is free software, with most of it being released under the Mozilla Public License (MPL) version 2.0. This license permits anyone to view, modify, or redistribute the source code. As a result, several publicly released applications have been built from it, such as Netscape , Flock , Miro , GNU IceCat , Iceweasel , Songbird ...
- Purposes and Abilities
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The latest version is Qt 5.15.0, which was released on 26 May 2020. The current LTS version is Qt 5.15 LTS. It will be supported for 3 years. Also Qt 5.12 is LTS versionActual Version is 5.12.8. The initial release of Qt software was on 20 May 1995.
In 2017, the Qt Company estimated a community of about 1 million developers worldwidein over 70 industries.
Qt is built on these key concepts: Complete abstraction of the GUI 1. When first released, Qt used its own paint engine and controls, emulating the look of the different platforms it runs on when it drew its widgets. This made the porting work easier because very few classes in Qt really depended on the target platform; however, this occasionally led to slight discrepancies where that emulation was imperfect. Recent versions of Qt use the native style APIs of the different platforms, on platf...
Starting with Qt 4.0 the framework was split into individual modules. With Qt 5.0 the architecture was modularized even further. Qt is now split into essential and add-onmodules.
There are four editions of Qt available: Community, Indie Mobile, Professional and Enterprise. The Community version is under the open source licenses, while the Indie Mobile, Professional and Enterprise versions, which contain additional functionality and libraries, e.g. Enterprise Controlsare commercially sold by The Qt Company.
In the summer of 1990, Haavard Nord and Eirik Chambe-Eng (the original developers of Qt and the CEO and President, respectively, of Trolltech) were working together on a database application for ultrasound images written in C++ and running on Mac OS, Unix, and Microsoft Windows.They began development of "Qt" in 1991, three years before the company was incorporated as Quasar Technologies, then changed the name to Troll Tech and then to Trolltech. The toolkit was called Qt because the letter Q...
Becoming free software–friendly
With the release of version 2.0 of the toolkit, the license was changed to the Q Public License (QPL), a free software license, but one regarded by the Free Software Foundation as incompatible with the GPL. Compromises were sought between KDE and Trolltech whereby Qt would not be able to fall under a more restrictive license than the QPL, even if Trolltech was bought out or went bankrupt. This led to the creation of the KDE Free Qt foundation, which guarantees that Qt would fall under a BSD-s...
Acquisition by Nokia
Nokiaacquired Trolltech ASA on 17 June 2008 and changed the name first to Qt Software, then to Qt Development Frameworks. Nokia focused on turning Qt into the main development platform for its devices, including a port to the Symbian S60 platform. Version 1.0 of the Nokia Qt SDK was released on 23 June 2010. The source code was made available over Gitorious, a community oriented gitsource code repository, with a goal of creating a broader community using and improving Qt. On 14 January 2009,...
- 20 May 1995; 25 years ago
- 6.1 (6 May 2021; 5 days ago) [±]
- Haavard Nord and Eirik Chambe-Eng
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May 27, 2021 · Sun has released most of the Solaris source code under the Common Development and Distribution License , which is based on the Mozilla Public License (MPL) version 1.1. The CDDL was approved as an open source license by the Open Source Initiative (OSI) in January 2005. Files licensed under the CDDL can be combined with files licensed under ...
- UA Communication Stack
- UA Security
- OPC UA Apis
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Although developed by the same organization, OPC UA differs significantly from its predecessor, Open Platform Communications (OPC). The Foundation's goal for OPC UA was to provide a path forward from the original OPC communications model (namely the Microsoft Windows-only process exchange COM/DCOM) that would better meet the emerging needs of industrial automation. After more than three years of specification work and another year for a prototype implementation, the first version of the Unified Architecture was released in 2006. The current version of the specification is on 1.04 (22 November 2017). The new version of OPC UA now has added publish/subscribe in addition to the client/server communications infrastructure.
Although the original binding to COM/DCOM helped OPCto distribute well, it had several drawbacks: 1. Frequent configuration issues with DCOM; 2. No configurable time-outs; 3. Microsoft Windowsonly; 4. Lower security; 5. No control over DCOM (COM/DCOM is kind of a black box, developers have no access to sources and therefore have to deal with bugs or insufficient implementations). These drawbacks along with a number of other considerations pushed the decision to develop a new and independent stack for OPC UA, which replaces COM/DCOM. The main characteristics of this communication stack were: 1. Multi-platform implementation, including portable ANSI C, Java and .NETimplementations; 2. Scalability: from smart sensors and smart actuators to mainframes; 3. Multi-threaded, as well as single-threaded/single-task operation—necessary for porting the stack to embedded devices; 4. Security, based on new standards; 5. Configurable time-outs for each service; 6. Chun...
OPC UA supports two protocols. This is visible to application programmers only via changes to the URL. The binary protocol is opc.tcp://Server and http://Server is for Web Service. Otherwise OPC UA works completely transparent to the API. The binary protocol offers the best performance/least overhead, takes minimum resources (no XML Parser, SOAP and HTTPrequired, which is important for embedded devices), offers best interoperability (binary is explicitly specified and allows fewer degrees of freedom during implementation) and uses a single arbitrarily choosable TCP port for communication easing tunneling or easy enablement through a firewall. The Web Service (SOAP) protocol is best supported from available tools, e.g., from Java or .NET environments, and is firewall-friendly, using standard HTTP(S) ports. Binary is supported by all implementations, while only .NET implementation supports SOAP.
The OPC UA specification is a multi-part specification and consists of the following parts: 1. Concepts 2. Security Model 3. Address Space Model 4. Services 5. Information Model 6. Mappings 7. Profiles 8. Data Access 9. Alarms and Conditions 10. Programs 11. Historical Access 12. Discovery and Global Services 13. Aggregates 14. PubSub 15. Safety 16. State machines (not published yet) 17. Alias names 18. User Authorization (not published yet) 19. Dictionary References Additionally, part 100 Devices, and part 200 Industrial Automation are also available. These build on the core set of specifications, and adds new common definitions that then are used in different companion specifications. E.g. both OPC UA for Analyser Devices and OPC UA for Machinerybuilds directly on part 100. In contrast to the COM-based specifications, the UA specifications are not pure application specifications. They describe typically UA internal mecha...
The OPC UA protocol specification consists of 14 documents for a total of 1250 pages. Due to this complexity, existing implementations are usually incomplete. In addition, the existence of several serialization formats, as well as the possibility of selectively implementing certain services such as PubSub, eventually lead to a great heterogeneity of the OPC UA connection points. Under these conditions, it is finally difficult to develop client applications that are independent of the specific implementation of each server. In this sense, OPC UA does not achieve its promise of ensuring good interoperability of systems. This can be seen typically in factory and infrastructure projects integrating various PLC technologies, each delivered with a different and limited implementation of the OPC UA protocol. The specification is still evolving, the last specification document volum...
The architecture of a UA application, independent of whether it is the server or client part, is structured into levels. Some parts equalize to the former COM Proxy/Stubs and get provided by the OPC Foundation. The portability level is new; it simplifies porting the UA ANSI C stack to other target platforms. A port layer for Windows and Linuxis also provided by the OPC Foundation.
UA Security consists of authentication and authorization, encryption and data integrity via signatures. For Web Services the WS-SecureConversation gets used and is therefore compatible to .NET and other SOAPimplementations. For the binary variant, the algorithms of WS-SecureConversation have been followed and also converted to a binary equivalent. This is named as UA Secure Conversation. There is also a mixed version where the code is binary, but the transport layer is SOAP. This is a compromise between efficient binary coding and firewall-friendly transmission. Binary coding always requires UA Secure Conversation.The authentication uses X.509 certificates exclusively. It relies on the application developer to choose which certificate store the UA application gets bound to. For instance, it is possible to use the public key infrastructure (PKI) of an Active Directory.
Jun 03, 2021 · 0.4.4.8 (16 March 2021; 2 months ago (2021-03-16)) Tor is free and open-source software for enabling anonymous communication. It directs Internet traffic through a free, worldwide, volunteer overlay network, consisting of more than seven thousand relays, for concealing a user's location and us
May 20, 2021 · Bug 1711063 - Part 4: Add the ability to pass an allocation site when assembling inline allocations r?jandem Summary: For baseline allocations we still want to track the allocations made and update the AllocSite whereas for optimized code we want to ignore this entirely and use the catch-all optimzed site for tracked allocation sites.
May 20, 2021 · Content of hal/Hal.h at revision ab4e65106302cb9f55f8a0269aca4a7249ababf5 in m-c
May 22, 2021 · Mozilla Public License 1.1 2; ... It's especially intended to make Wikipedia available offline. With Kiwix, you can enjoy Wikipedia on a boat, in the middle of ...
May 22, 2021 · Content of config/check_spidermonkey_style.py at revision fba6f974041a3d3c22ef95c44f6e4262e8e5c52f in m-c
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