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What (who) is system calls - definition

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

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.

https://en.wikipedia.org/wiki/System_call

Crazy He Calls Me

ORIGINAL SONG COMPOSED BY CARL SIGMAN, WITH LYRICS BY BOB RUSSELL; FIRST RECORDED BY BILLIE HOLIDAY

Crazy She Calls Me

"Crazy He Calls Me" is a 1949 jazz standard. It was composed by Carl Sigman, with lyrics by Bob Russell.

https://en.wikipedia.org/wiki/Crazy_He_Calls_Me

Wikipedia

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.

https://en.wikipedia.org/wiki/System call

Examples of use of system calls

1. The U.S. system calls for a radar screen in the Czech Republic to watch for missile threats, and 10 interceptor rockets in Poland to shoot down any missiles.

2. The U.S. system calls for a radar screen in the Czech Republic to watch for missile threats and 10 interceptor rockets in Poland to shoot down any missiles.

3. That system calls for developing job goals for employees, tracking their accomplishments and using job ratings to steer larger pay raises to the best workers.

4. Hundreds of Czechs gathered in a Prague downtown square to protest the agreement, waving banners with slogans such as "It‘s not over yet," and "Condoleezza is not welcome!" The proposed U.S. missile defense system calls for a tracking radar in the Czech Republic and 10 interceptor missiles in Poland.

5. It‘s geometry and geography as to how you intercept a missile.‘‘ This is an idea that has not yet been vetted,‘‘ she said of Putin‘s offer. We have to see whether Azerbaijan makes any sense in the context of missile defense.‘‘ The U.S. system calls for a radar screen in the Czech Republic to watch for missile threats, and 10 interceptor rockets in Poland to shoot down any missiles.