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Method to access file data on a computer
POSIX compliant operating systems, a program that needs to access data from a file stored in a file system uses the read system call. The file is identified
Read_(system_call)
Way for programs to access kernel services
In computing, a system call (syscall) is the programmatic way in which a computer program requests a service from the operating system on which it is executed
System_call
System call in a Unix-like operating system kernel
by assembler code using the C preprocessor. fwrite getchar fprintf read (system call) sync (Unix) http://www.unix.com/man-page/FreeBSD/2/write/ Manual
Write_(system_call)
Topics referred to by the same term
Resources from Wikiversity Read or READ may refer to: Read (computer), to retrieve data from a storage device Read (system call), a low-level IO function
Read
Linux kernel interface for input events
the appearance of the device. Libevdev shares similarities with the read system call. It sits below the process that handles input events, in between the
Evdev
Computer terminal application programming interface
being triggered by the start of the read() system call, or if a single character is received. In other words, read() waits for a maximum specified total
POSIX_terminal_interface
Technology for controlling access to file system items
the ability to manipulate file system items. Often the settings allow controlling access based on function such as read, change, navigate, and execute
File-system_permissions
Linux-specific system call
Linux-specific system call that moves data between a file descriptor and a pipe without a round trip to user space. The related system call vmsplice() moves
Splice_(system_call)
System calls in some operating systems
In Unix-like operating systems, a program initializes access to a file in a file system using the open system call. This allocates resources associated
Open_(system_call)
Computer program for sharing resources
Dump core request WRITEI Internal form of write system call READI Internal form of read system call RSIGNAL Sendremote signal SYNCTIME Synchronize time
Remote_File_Sharing
2022 death in Canton, Massachusetts, US
phone recorded as read at 12:27:48 am after being unlocked with Face ID. At 12:29:44 am, the phone logged a seven-second answered phone call from Jennifer;
Death_of_John_O'Keefe
Transient computing pipe
operating systems. Pipes are created using the pipe system call, which creates a new pipe and returns a pair of file descriptors referring to the read and write
Anonymous_pipe
Software that manages computer hardware resources
the other registers onto the call stack. (Alternatively, the contents of the registers may be placed in a system table.) Read the integer from the data bus
Operating_system
Lightweight dynamic tracing environment
@@syscall:*:read:entry when ( __pid == 123456) { /* This is a comment: The process with a PID of 123456 has called read(); */ printf("read() system call entered
ProbeVue
Low level firmware interface to the hardware
operating systems and application programs to use the facilities of the firmware on IBM PC compatible computers. Traditionally, BIOS calls are mainly
BIOS_interrupt_call
Form of inter-process communication in computer systems
by the kernel while signals are mediated by the kernel (possibly via system calls) and handled by individual processes.[citation needed] The kernel may
Signal_(IPC)
Australian politician and general practitioner (1962–2026)
Tim Read (1962 – 19 September 2026) was an Australian politician who was a member of the Victorian Legislative Assembly, representing the district of Brunswick
Tim_Read
Linux kernel interface for storage devices
Computer programming portal Linux portal io_uring is a Linux kernel system call interface for storage device asynchronous I/O operations. It addresses
Io_uring
Memory map - POSIX-compliant system call
In computing, mmap(2) is a POSIX-compliant Unix system call that maps files or devices into memory. It is a method of memory-mapped file I/O. It implements
Mmap
Offset that corresponds to the first byte beyond the length of a computer file
condition in a computer operating system where no more data can be read from a data source. The data source is usually called a file or stream. In the C standard
End-of-file
Way of using computer memory
computer operating system usually uses virtual memory to provide separate address spaces or regions of a single address space, called user space and kernel
User_space_and_kernel_space
Computer programming environment
describing a REPL-based language, called OPL-1, implemented in his Fortran-SLIP language on the Compatible Time Sharing System (CTSS). The 1974 Maclisp reference
Read–eval–print_loop
Radio station in Dishman, Washington, United States
Spokane media market. The station is owned by Thomas R. Read, through licensee Liberty Broadcasting System, LLC, and is the flagship for the American Christian
KSPO_(AM)
System calls in Unix-like operating systems
August 2015, FreeBSD introduced the read_random system call for obtaining random data from the kernel. These system calls allow processes to access quality
Entropy-supplying system calls
Entropy-supplying_system_calls
Data format used in communication protocols
T_CALLER_NUMBER, so the length field is read (i.e., 12) and the system skips forward 12 bytes to read T_PHONE_NUMBER_TO_CALL, which it understands, and message
Type–length–value
Generalized abstraction of terminal use
(acting like a carriage return except discarded from the buffer by the read() system call and therefore potentially causing a zero-length result to be returned)
Seventh Edition Unix terminal interface
Seventh_Edition_Unix_terminal_interface
Taking in the meaning of letters or symbols
written language, by means of sight or touch. The ability to read (and write) is called literacy. For educators and researchers, reading is a multifaceted
Reading
2011 American film by J. C. Chandor
average rating of 7.2/10. The website's consensus reads: "Smart, tightly wound, and solidly acted, Margin Call turns the convoluted financial meltdown of '08
Margin_Call
Safety anti-skid braking system used on aerospace and land vehicles
read the vehicle's owner's manual, this may not be noticeable until an emergency. Some manufacturers have therefore implemented a brake assist system
Anti-lock_braking_system
Programming language evaluation rules
program (read and assign have been added to highlight the similarities to the Java Box call-by-sharing program above): #include <stdio.h> int read(int* p)
Evaluation_strategy
Artificial intelligence model developed by TypeSafe AI
by other software rather than read by a person. TypeSafe describes Jev as the first of a class of models it calls "System One models", a name the company
Jev_(AI_model)
Synchronization mechanism
science, read-copy-update (RCU) is a synchronization mechanism that avoids the use of lock primitives while multiple threads concurrently read and update
Read-copy-update
discussion system that uses the Network News Transfer Protocol (NNTP). Programs called newsreaders are used to read and post messages (called articles or
List_of_Usenet_newsreaders
Proprietary file system by Apple
found on read-only media such as CD-ROMs. HFS is also referred to as Mac OS Standard (or HFS Standard), while its successor, HFS Plus, is also called Mac OS
Hierarchical File System (Apple)
Hierarchical_File_System_(Apple)
Unix-like software that manages kernel attributes
software mechanism in some Unix-like operating systems that reads and modifies the attributes of the system kernel such as its version number, maximum limits
Sysctl
Form of input/output processing
its next operation. (For example, the CP/M operating system was built this way. Its system call semantics did not require any more elaborate I/O structure
Asynchronous_I/O
Form of government
Westminster system, such as the United Kingdom, Denmark, Malaysia, Australia and New Zealand, the prime minister has the de facto power to call an election
Parliamentary_system
System call for device-specific input/output operations
input/output control) is a system call for device-specific input/output operations and other operations which cannot be expressed by read/write/seek regular file
Ioctl
Structured vocabulary for voice communication
Radio System (MARS) AFMARS Messaging Manual" (PDF). Archived from the original (PDF) on 25 September 2017. Retrieved 23 September 2017. "do you read me"
Procedure_word
Proprietary file system developed by Microsoft
1, it is the default file system of the Windows NT family superseding the File Allocation Table (FAT) file system. NTFS read/write support is available
NTFS
Radio station in Spokane, Washington
held by the Mutual Broadcasting System, LLC, owned by Thomas Read, along with KFIO and KSPO. This Mutual Broadcasting System is unrelated to the defunct nationwide
KTRW
Process that is not running, but is in the process table
needed to allow the parent process to read its child's exit status: once the exit status is read via the wait system call, the defunct process' entry is removed
Zombie_process
Family of Unix-like operating systems that use the Linux kernel
operating system such as macOS or Microsoft Windows. The Linux kernel, for example, is licensed under the GPLv2, with an exception for system calls that allows
Linux
Planetary system consisting of the Sun and objects orbiting it
potential. The Solar System currently moves through a cloud of interstellar medium called the Local Cloud. The closest star to the Solar System, Proxima Centauri
Solar_System
Tabletop horror role-playing game
writing of Call of Cthulhu, and the game was released in 1981. Petersen oversaw the first four editions with only minor changes to the system. Once he left
Call of Cthulhu (role-playing game)
Call_of_Cthulhu_(role-playing_game)
Sequence of program instructions invokable by other software
indication. A callable writes the value and the caller reads it after a call. In the IBM System/360, where return code was expected from a subroutine,
Function (computer programming)
Function_(computer_programming)
Call assistance services
and read back the number. Most systems allowed up to two listings per call. Early operators worked from printed telephone directories. Later systems introduced
Operator_assistance
Distributed file system protocol
protocols, builds on the Open Network Computing Remote Procedure Call (ONC RPC) system. NFS is an open IETF standard. After the first experimental version
Network_File_System
Shell command for changing access permissions of a file
of the system call to a shell user. As the need for enhanced file-system permissions grew, access-control lists were added to many file systems to augment
Chmod
Storage segment
categorized into two sections: read-only and read/write. This distinction grew from early systems holding their main program in read-only memory such as Mask
Data_segment
System call to examine the status of file descriptors of open input/output channels
select is a system call and application programming interface (API) in Unix-like and POSIX-compliant operating systems for examining the status of file
Select_(Unix)
Sociotechnical infrastructure for centralized and digital health care management
A hospital information system (HIS) is an element of health informatics that primarily addresses the administrative and operational needs of hospitals
Hospital_information_system
Computer operating system
management mounts activated packages over a read-only system directory. The Haiku package management system performs dependency solving with libsolv from
Haiku_(operating_system)
Core of a computer operating system
information to the kernel and switching to supervisor mode. System calls include close, open, read, wait and write. To actually perform useful work, a process
Kernel_(operating_system)
System of library classification
between topics), hospitality (the ability of the system to accommodate new subjects), and brevity (length of call numbers). While LCC is significantly less expressive
Library of Congress Classification
Library_of_Congress_Classification
Software framework for audio
names. ALSA API uses ioctl() calls in a way not allowed in the QNX kernel. Free and open-source software portal Open Sound System DSSI udev JACK Audio Connection
Advanced Linux Sound Architecture
Advanced_Linux_Sound_Architecture
Convention of symbols representing language
A writing system is any conventional system for representing a particular language using a set of symbols (called a script), as well as the rules those
Writing_system
Computer system that provides behavior needed by running code
If the boot is from read-only memory, a secure, single-mission system is created. Examples of such directly bundled runtime systems include: Between 1983
Runtime_system
Family of disk operating systems
for user programs. The first layer of the operating system is called RWTS, which stands for "read/write track sector". This layer consists of subroutines
Apple_DOS
Form of non-volatile memory used in computers and other electronic devices
manufacture of the memory device. Read-only memory is useful for storing software that is rarely changed during the life of the system, also known as firmware.
Read-only_memory
Type of shared data structure
communicate by accessing shared data structures. A shared (read/write) register, sometimes just called a register, is a fundamental type of shared data structure
Shared_register
Voice or tone user interface for telephony
Interactive voice response (IVR) systems are automated telephony systems that interact with callers, gather information, and route calls to the appropriate recipient
Interactive_voice_response
Programming language family
Lisp system. Lisp reads the entered expressions, evaluates them, and prints the result. For this reason, the Lisp command line is called a read–eval–print
Lisp_(programming_language)
To check if an email has been read
or email tracker is a method for monitoring whether the email message is read by the intended recipient. Most tracking technologies use some form of digitally
Email_tracking
Experimental operating system from Microsoft Research
the cost of task-switches. Memory protection in this system is provided by a set of rules called invariants that are verified by static program analysis
Singularity (operating system)
Singularity_(operating_system)
Unix command to commit all data in the kernel filesystem to non-volatile storage buffers
sync is a standard system call in the Unix operating system, which commits all data from the kernel filesystem buffers to non-volatile storage, i.e., data
Sync_(Unix)
BIOS interrupt call for disk access
is shorthand for BIOS interrupt call 13hex, the 20th interrupt vector in an x86-based (IBM PC-descended) computer system. The BIOS typically sets up a real
INT_13H
Midrange IBM computer from 1960s
FORTRAN G, FORTRAN H and PL/I F. CALL/OS is sometimes referred to as "CALL-OS". Installations with a larger model of the System/360 family sometimes ran/retained
IBM_System/360_Model_50
The later Enterprise Systems Architecture/390 (ESA/390), introduced in 1990, added a facility to allow device descriptions to be read using channel commands
IBM Enterprise Systems Architecture
IBM_Enterprise_Systems_Architecture
Sandbox facility for Linux kernel
make any system calls except exit(), sigreturn(), read() and write() to already-open file descriptors. Should it attempt any other system calls, the kernel
Seccomp
System to predict users' preferences
A recommender system, also called a recommendation engine or content discovery platform is a type of information filtering system that aims to suggest
Recommender_system
Software loop that processes events
select and poll system calls allow a set of file descriptors to be monitored for a change of state, e.g. when data becomes available to be read. For example
Event_loop
read and write with Ext2 and Ext3 file systems only when a driver from FS-driver or Ext2Fsd is installed. However, using Explore2fs, Windows can read
Comparison of operating systems
Comparison_of_operating_systems
Write once computer memory
programmed at the wafer, final test, or system stage. Blank PROM chips are programmed by plugging them into a device called a PROM programmer. A typical PROM
Programmable_ROM
Systems of coding and organizing documents or library materials
indexes. Each item is typically assigned a call number, which identifies the location of the item within the system. Materials can be arranged by many different
Library_classification
Acquiring the skills to understand the meaning of written words
Learning to read or reading skills acquisition is the acquisition and practice of the skills necessary to understand the meaning behind printed words.
Learning_to_read
2014 first-person shooter video game
Warfare's multiplayer retains certain similarities to previous Call of Duty titles. The Pick 10 system in Black Ops II returns as Pick 13, allowing players to
Call of Duty: Advanced Warfare
Call_of_Duty:_Advanced_Warfare
Function Call is a proprietary SAP interface. Remote Function Call (RFC) is the standard SAP interface for communication between SAP systems. The RFC calls a
Remote_Function_Call
American satellite-based radio navigation service
The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta
Global_Positioning_System
Computer resource for recording data on a storage device
unit by the system that manages it. Today, this system is called a file system. Many older computer systems lacked a distinct file system per se, yet
Computer_file
Journaling file system for Linux
standard POSIX calls, such as open, read, write, lseek, etc. Although designed for and primarily used with Linux, an ext4 file system can be accessed
Ext4
Home video game console
Computer Disk System (or Famicom Disk System) in Japan on February 21, 1986, at a retail price of ¥15,000. The advantages of the format (called "Disk Card")
Nintendo_Entertainment_System
Schools to assimilate Indigenous children
Francis acknowledged the system as genocide in 2022. The House of Commons called for recognition of the residential school system as genocide in October
Canadian Indian residential school system
Canadian_Indian_residential_school_system
Phenomenon associated with solid state storage
the block are no longer needed (also called stale pages), only the pages with good data in that block are read and rewritten into another previously
Write_amplification
Copy-on-write file system developed by Apple
clonefile system call. APFS volumes support snapshots for creating a point-in-time, read-only instance of the file system. Apple File System natively supports
Apple_File_System
Former United States emergency warning system
Emergency Broadcast System (EBS), sometimes called the Emergency Action Notification System (EANS), was an emergency warning system used in the United
Emergency_Broadcast_System
Directory structure used by a Unix-like operating system
programs that traditionally form a Unix system can store information in files so that other programs can read them, although pipes complemented it in
Unix_filesystem
First letter of the Latin alphabet
used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, the name of the
A
Computer operating system
Microsoft started work on a program called "Interface Manager". The name "Windows" comes from the fact that the system was one of the first to use graphical
Microsoft_Windows
Educational software application
internet-based LMSs. The first fully featured Learning Management System (LMS) was called EKKO, developed and released by Norway's NKI Distance Education
Learning_management_system
Computer filing system
as whether the file is read-only, executable, etc. device type (e.g. block, character, socket, subdirectory, etc.) A file system stores associated metadata
File_system
These systems have not been deciphered. In some cases, such as Meroitic, the sound values of the glyphs are known, but the texts still cannot be read because
List_of_writing_systems
2020 American documentary television series
March 2, 2020. "Netflix's 'The Trials of Gabriel Fernandez' as it unfolded: Read our coverage". Los Angeles Times. February 26, 2020. Retrieved February 28
The Trials of Gabriel Fernandez
The_Trials_of_Gabriel_Fernandez
Computer programming technique
anticipate or intend. For example, the injected code could hook system function calls, or read the contents of password textboxes, which cannot be done the
DLL_injection
Software security mechanism
(seccomp) strict mode, seccomp only allows the write(), read(), exit(), and sigreturn() system calls. HTML5 has a "sandbox" attribute for use with iframes
Sandbox_(computer_security)
POSIX C header
(read, write, close, etc.). Unix compatibility layers such as Cygwin and MinGW also provide their own versions of <unistd.h>. In fact, those systems provide
Unistd.h
Action performed by computers
source and place it into their volatile memory for processing. Computers may read information from a variety of sources, such as magnetic storage, the Internet
Reading_(computer)
Deterministic model of computation
machine strictly has only one state. A tag system is a triplet (m, A, P), where m is a positive integer, called the deletion number. A is a finite alphabet
Tag_system
Free and open-source operating system
has the benefit of making the system more robust; if a userspace driver crashes, it will not crash the kernel. System calls are being split into userland
DragonFly_BSD
The history of learning to read dates back to the invention of writing during the 4th millennium BC. Concerning the English language in the United States
History_of_learning_to_read
travel, tourism, insurance
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
READ SYSTEM-CALL
travel, tourism, insurance