signal handler

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Introduction and application of PHP-GTK

1. PHP-GTK Introduction 1.1 PHP-GTK PHP-GTK is a php extension module that allows programmers to write programs that are executed on a client-side, independent GUI. This module does not allow the GTK + program to be viewed in the browser, and it is

Sleep and alarm

Sleep function: #include unsigned int sleep (unsigned int seconds); This function causes the calling process to be suspended until one of the following conditions is met: 1 has passed the wall clock time specified by seconds 2 The calling

Linux system Programming signal (二) signal sending function and different precision sleep

First, kill, raise, KILLPG function int Kill (pid_t pid, int sig); int raise (int sig); int killpg (int pgrp, int sig); The KILL command is implemented by calling the Kill function, which can send a specified signal to a specified process or

Linux under C Programming: Sigsuspend Execution Process Analysis

Used to replace the process's signal mask temporarily with mask before receiving a signal, and to suspend the process until the signal is received. /*the sigsuspend () function replaces the current signal mask of the calling thread and the set of

Linux process Management signal processing (1)

Signal is a very important mode of communication in the operating system. In recent versions, there have been few major changes in signal processing. We analyze the signal implementation of the Linux kernel from the user space signal application.

Summary of common breakdowns of hard disk parts

1. Hard disk power supply: The power of the hard drive from the host's switching power supply, the voltage of four terminals are: Red is 5V, black for ground, yellow is positive 12V, through the linear power conversion circuit, to transform the

Introduction to Reentrant functions and non-reentrant functions in Linux

reentrant functions Reentrant functions (that is, functions that can be interrupted) can be invoked by more than one task without worrying about data destruction. Reentrant functions can be interrupted at any time, and after a period of time can

Linux C sigsuspend Process blocking

Function Prototypes: #include int sigsuspend (const sigset_t *mask); Role: Used to replace the process's signal mask temporarily with mask before receiving a signal, and to suspend the execution of the process until the signal is received. The

C + + implementation file Change tips

The code is as follows:#include #include #include /*static volatile Atomic variable*/static volatile sig_atomic_t Sigflag = 0;/*private Signal Control handler*/static void Turnflag (int no) {Sigflag = (Sigflag = = 0)? 1:0;}/*** Set Signal Handler*

Use PHP script to write daemon program

What is the daemon process This is another interesting concept, daemon in English is "elf" meaning, as we often see in the Disney animation, some will fly, some will not, often around the cartoon protagonist, Shing to mention some advice,

The problem of Linux signal processing method

This week a new colleague asked me to look at a signal processing problem, the program wants to exit after receiving a signal, and he does a lot of things in the signal processing, including freeing up some global memory. So the problem arises, the

Signal to achieve synchronization between parent and child processes: the role of Sigsuspend

Function Prototypes: #include int sigsuspend (const sigset_t *mask); Role: Used to replace the process's signal mask temporarily with mask before receiving a signal, and to suspend the execution of the process until the signal is received. The

UNIX Network programming: How to use the TCP and UDP callback server programs with the Select function

Server program: #include #include #include #include #include #include #include #include #include ;signal.h> #include #include #include #include #define Serv_port 3334 #define LISTENQ 5 #define Maxline void Str_echo (int sockfd)

Linux Programming: Time and file and signal operation

#include #include #include #include #include #include void Fun (int x) { printf ("Hello world!\r\n") ; int i; FILE *f=fopen ("A.txt", "rw+"); if (f==null) {printf ("file error\r\n"); Exit ( -1);}; for

Summary of common breakdowns of hard disk parts

1. Hard disk power supply: The power of the hard drive from the host's switching power supply, the voltage of four terminals are: Red is 5V, black for ground, yellow is positive 12V, through the linear power conversion circuit, to transform the

UNIX Environment Advanced Programming: Threads and Signals

Each thread has its own signal screen word, but the processing of the signal is shared by all threads in the process. This means that while a single thread can block certain signals, when a thread modifies the processing behavior associated with a

Linux interprocess communication (v) signal of Signal communication (), Signal Set function group and its basic experiment

In the previous section, one of the ways of interprocess communication is the signal generation and capture function in signal communication, this section introduces the signal () function and the SET function group of signal processing functions,

PHP script writes Daemon program

This is another interesting concept, daemon in English is "elf" meaning, as we often see in the Disney animation, some will fly, some will not, often around the cartoon protagonist, Shing to mention some advice, occasionally unlucky to hit the

Do your own to improve the performance of Ubuntu systems

In every basic system, there are a variety of basic processes for checking system services, communicating with the operating system, and so on. The performance of processes and systems is strongly related, therefore, a system manager should have a

Linux Programming Basics (vi) reentrant functions, sig_atomic_t types, and volatile qualifiers

One, POSIX definitions of both reentrant and thread-safe concepts: Reentrant Function:a Function whose effect when called by two or over threads,is to as if The threads each executed the function one over another in a undefined order, even if the

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