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Что (кто) такое system call - определение
IN COMPUTER SCIENCE, THE MECHANISM USED BY AN APPLICATION PROGRAM TO REQUEST SERVICE FROM THE OPERATING SYSTEM OR ANOTHER APPLICATION PROGRAM
System calls; Syscall; System Call; Int 0x80; INT 0x80
![A high-level overview of the Linux kernel's system call interface, which handles communication between its various components and the [[userspace]]](https://commons.wikimedia.org/wiki/Special:FilePath/Linux kernel interfaces.svg?width=200 "A high-level overview of the Linux kernel's system call interface, which handles communication between its various components and the [[userspace]]")
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system call
<operating system, programming> The mechanism used by an
application program to request service from the {operating
system}. System calls often use a special machine code
instruction which causes the processor to change mode (e.g. to
"supervisor mode" or "protected mode"). This allows the OS
to perform restricted actions such as accessing hardware
devices or the memory management unit.
(1995-03-01)
System call
In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the kernel of the operating system on which it is executed. This may include hardware-related services (for example, accessing a hard disk drive or accessing the device's camera), creation and execution of new processes, and communication with integral kernel services such as process scheduling.
Call login system
Call Login Systems
Call login systems are telephone systems that allow voice-based call center executives to log into their phone equipment in order to make or receive calls. This system helps in calculating login hours, documentation hours, and break timings.
Call-to-gate system
Call-to-gate
A call-to-gate system is an airport terminal design in which passengers are kept in a central area until shortly before their flight is due to board, rather than waiting near their gate. The international terminal at Calgary International Airport was the first terminal in North America to use this system, which is also used by European airports such as London Heathrow.
call sign
![WWV]], indicating its early location in the U.S. state of [[Maryland]]](https://commons.wikimedia.org/wiki/Special:FilePath/QSL card sent to listener confirming reception of WWV from Maryland - 194007.jpg?width=200 "WWV]], indicating its early location in the U.S. state of [[Maryland]]")
UNIQUE DESIGNATION FOR A TRANSMITTING STATION
Television call sign; Call letters; Radio call sign; Call signs; Callsign (radio); Call Letters; Amateur call letters; Call letter; Australian callsigns; W (call sign); Ham prefix; Broadcast call sign; Call Sign; Callsigns; Call-sign; International call sign; International call signs; Call signal; International callsign; Call name (call letters); Callsign
Sequence of letters and numbers, unique to each ship, that identify the ship.
call sign
UNIQUE DESIGNATION FOR A TRANSMITTING STATION
Television call sign; Call letters; Radio call sign; Call signs; Callsign (radio); Call Letters; Amateur call letters; Call letter; Australian callsigns; W (call sign); Ham prefix; Broadcast call sign; Call Sign; Callsigns; Call-sign; International call sign; International call signs; Call signal; International callsign; Call name (call letters); Callsign
(also call signal)
¦ noun a message, code, or tune that is broadcast by radio to identify the broadcaster or transmitter.
Call option
FINANCIAL INSTRUMENT
Clean up call; Call options; Call provisions; European Call Option; Long call; Short call
A call option, often simply labeled a "call", is a contract, between the buyer and the seller of the call option, to exchange a security at a set price. The buyer of the call option has the right, but not the obligation, to buy an agreed quantity of a particular commodity or financial instrument (the underlying) from the seller of the option at a certain time (the expiration date) for a certain price (the strike price).
call letters
UNIQUE DESIGNATION FOR A TRANSMITTING STATION
Television call sign; Call letters; Radio call sign; Call signs; Callsign (radio); Call Letters; Amateur call letters; Call letter; Australian callsigns; W (call sign); Ham prefix; Broadcast call sign; Call Sign; Callsigns; Call-sign; International call sign; International call signs; Call signal; International callsign; Call name (call letters); Callsign
¦ plural noun N. Amer. a sequence of letters used by a television or radio station as an identifying code.
call sign
UNIQUE DESIGNATION FOR A TRANSMITTING STATION
Television call sign; Call letters; Radio call sign; Call signs; Callsign (radio); Call Letters; Amateur call letters; Call letter; Australian callsigns; W (call sign); Ham prefix; Broadcast call sign; Call Sign; Callsigns; Call-sign; International call sign; International call signs; Call signal; International callsign; Call name (call letters); Callsign
(call signs)
A call sign is the letters and numbers which identify a person, vehicle, or organization that is broadcasting on the radio or sending messages by radio.
N-COUNT
Call sign
UNIQUE DESIGNATION FOR A TRANSMITTING STATION
Television call sign; Call letters; Radio call sign; Call signs; Callsign (radio); Call Letters; Amateur call letters; Call letter; Australian callsigns; W (call sign); Ham prefix; Broadcast call sign; Call Sign; Callsigns; Call-sign; International call sign; International call signs; Call signal; International callsign; Call name (call letters); Callsign
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique designation for a transmitter station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity.
Википедия
System call
In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the operating system on which it is executed. This may include hardware-related services (for example, accessing a hard disk drive or accessing the device's camera), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.
In most systems, system calls can only be made from userspace processes, while in some systems, OS/360 and successors for example, privileged system code also issues system calls.
