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C Programming Tutorial 4: Pointers and Arrays

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1.0 Introduction

A pointer variable holds the address of another variable. It is said to be "pointing" to that variable. For example,

int *ip;

defines a variable ip of type integer pointer. ip points to a variable of type integer. At the implementation level, it holds the address of a variable to type integer.Read more

POSIX real-time signals in Linux

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1.0 Signals

Signals are notifications delivered asynchronously to a process by the kernel. Signals are grouped in two categories. First, there are standard signals, which have been there since the early days of Unix. Second, there are POSIX real-time signals which are specified in POSIX.1b, or, IEEE Std 1003.1b-1993, for Real-time Extensions for POSIX compliant Operating Systems.… Read more