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The SSDT maps syscalls to kernel function addresses. When a syscall is issued by a user space application, it contains the service index as parameter to indicate which syscall is called. The SSDT is then used to resolve the address of the corresponding function within ntoskrnl.exe. In modern Windows kernels, two SSDTs are used: One for generic ...
The Global Descriptor Table (GDT) is a data structure used by Intel x86 -family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size, and access privileges like executability and writability.
The cron in Version 7 Unix was a system service (later called a daemon) invoked from /etc/rc when the operating system entered multi-user mode. [12] Its algorithm was straightforward: Read /usr/lib/crontab [13] Determine if any commands must run at the current date and time, and if so, run them as the superuser, root. Sleep for one minute
Program-specific information (PSI) is metadata about a program (channel) and part of an MPEG transport stream. The PSI data as defined by ISO/IEC 13818-1 (MPEG-2 Part 1: Systems) includes four tables: The MPEG-2 specification does not specify the format of the CAT and NIT. PSI is carried in the form of a table structure.
Computing. System Service Descriptor Table, an internal data structure within Microsoft Windows. Secondary System Description Table, an ACPI table. SQL Server Data Tools, the IDE for working with Microsoft SQL Server 2012 databases and associated objects.
That selector consists of a 2-bit Requested Privilege Level (RPL), a 1-bit Table Indicator (TI), and a 13-bit index. When attempting address translation of a given logical address, the processor reads the 64-bit segment descriptor structure from either the Global Descriptor Table when TI=0 or the Local Descriptor Table when TI=1. It then ...
Service (systems architecture) In the contexts of software architecture, service-orientation and service-oriented architecture, the term service refers to a software functionality, or a set of software functionalities (such as the retrieval of specified information or the execution of a set of operations) with a purpose that different clients ...
ISO/IEC/IEEE 42010:2011 defines requirements on the description of system, software and enterprise architectures.It aims to standardise the practice of architecture description by defining standard terms, presenting a conceptual foundation for expressing, communicating and reviewing architectures and specifying requirements that apply to architecture descriptions, architecture frameworks and ...