The architecture of most modern processors, with the exception of some embedded systems, involves a security model. … See more

Generally, systems provide a library or API that sits between normal programs and the operating system. On Unix-like systems, that API is usually part of an implementation of the C library (libc), such as glibc, that provides … See more

On Unix, Unix-like and other POSIX-compliant operating systems, popular system calls are open, read, write, close, wait, exec, fork, exit, and kill. Many modern operating systems have hundreds of system call… See more

Implementing system calls requires a transfer of control from user space to kernel space, which involves some sort of architecture-specific feature. A typical way to implement this is to use a software interrupt… See more

System calls can be grouped roughly into six major categories:
1. Process control
2. File management
3. Device management … See more

System calls in most Unix-like systems are processed in kernel mode, which is accomplished by changing the processor execution mode to a more privileged one, but no process context switch is necessary – although a … See more

• DOS API
• Linux kernel API
• VDSO See more