fork bomb

In Linux, fork is used to create a sub-process, which has the following characteristics:1) executes once, returns 2 times, its return value in the parent process is the PID of the child process, and the return value in the child process is 0. The child process wants to get the PID of the parent process to call the Getppid function.2) The generated child process will copy the code after the fork function3) G

1. Fork + execFork is used to create a child process. When a program calls the fork function, the system prepares the previous three segments for a new process, first, the system allows the new process to use the same code snippet as the old process, because the program is still the same, and for the data segment and stack segment, the system copies a copy to the new process, so that All the data for the pa

Http://www.boluor.com/summary-of-fork-in-linux.html The fork function is very important in Linux, because most processes are created through it. For example, when a Linux system starts, process 0 is created first, and many subsequent processes are created using do_fork. in the past two days, I learned about fork while watching the anonymous pipeline. After all, i

1. Fork + Exec Fork is used to create a child process. When a program calls the fork function, the system prepares the preceding three segments for a new process. First, the system allows the new process and the old process to use the same code segment, because their programs are the same, the system copies a copy of the data segment and stack segment to the new

Copy-on-write technology was originally generated by UNIX systems to implement a fool-like process creation: when a fork () system call is made, the kernel copies the entire address space of the parent process as-is and assigns the copied copy to the child process. This behavior is very time-consuming because it requires:· Assigning pages to a child process's page table· Assigning pages to a child process page· Initializing a page table for a child pr

Transfer from:: http://blog.csdn.net/jason314/article/details/5640969First, Fork Introduction knowledgeA process, including code, data, and resources assigned to the process. The fork () function creates a process that is almost identical to the original process through a system call.That is, two processes can do exactly the same thing, but two processes can do different things if the initial parameters or

IBM developer articles are good, there is no saying that the use of GDB multi-process debugging Tian Qiang (tianq@cn.ibm.com ),Software Engineer, IBM China Software Development CenterIntroduction:GDB is a common debugging tool in Linux. This article describes several methods for debugging multi-process programs using GDB and compares various methods.Mark this article!Release date:July 30, 2007Level:IntermediateAccess:10160 viewsComment:0 (View | Add comment-Log On)Average score (7 scores)Score f

One, the process replicates (or produces)The child processes obtained by using the fork function inherit the entire process's address space from the parent process, including: process context, process stack, memory information, open file descriptor, signal control settings, process priority, process group number, current working directory, root directory, resource limit, control terminal, and so on.The difference between a child process and a parent p

resource management, and the thread is the smallest unit of program execution.In a Linux system, POSIX threads can "be considered" as a lightweight process, pthread_create create threads and fork creation processes are created by invoking the __clone function in the kernel, except when the option to create a thread or process is different. For example, whether to share virtual address space, file descriptors, and so on.Fork and multithreadingWe know

The fork function is very important in Linux, because most of the processes are created through it. For example, when a Linux system starts, the process 0 is created first, and many subsequent processes obtainIn the past two days, I learned about fork while viewing anonymous pipelines. After all, fork has a wide range of applications. Here I will only talk about

Reference books: Data structure (C language Edition) Min Wu Weimin Tsinghua University Press1. What is a clue two fork tree The empty left child pointer points to the predecessor of the node; the empty right child pointer points to the successor of the node. This additional pointer value is called a clue, and a two-fork tree with a clue is called a clue two-fork

Fork,vfork,cloneUNIX standard replication process system calls fork (that is, fork), but Linux,bsd and other operating systems do not only implement this one, specifically, the Linux implementation of three, Fork,vfork,clone (specifically Vfork created is a lightweight process, also called a thread, Is the process of s

Man vfork:NAMEVfork- Create a child process and block parentSynopsis#include #include pid_t vfork (void);DESCRIPTIONStandard description(from Posix.1) The Vfork () function has the same effect as fork (2), except that the behav‐IOR is undefined if the process created by vfork () either modifies any data other than aVariable of type pid_t used to store the return value from Vfork (), or returns from thefunction in which vfork () is called, or calls any

Let's take a look at an example of using fork to invoke the EXECLP () function to implement the PS or LS command under Linux: #include "sys/types.h" #include "unistd.h" #include "stdio.h" #include "stdlib.h" int main () { pid_t result; Result=fork (); Error handling if (result==-1) { printf ("Fork error\n"); } Son else if (result==0) {//Call E

Turn from: http://blog.csdn.net/livingpark/article/details/4069049 "NOTE4" First, it must be clear that the return value of the function is stored in the register EAX. Second, when Fork returns, the new process returns 0 because the EAX is set to 0 when the task structure is initialized; In fork, the handle process is added to a running queue, and the process scheduler is scheduled to run at the right time.

Post from: http://blog.csdn.net/yuwenliang/archive/2010/01/18/5209239.aspx The following C program is provided and compiled using GCC in Linux: 1 # include "stdio. H" 2 # include "sys/types. H" 3 # include "unistd. H" 4 5 Int main () 6 { 7 pid_t pid1; 8 pid_t pid2; 9 10 pid1 = fork (); 11 pid2 = fork (); 12 13 printf ("pid1: % d, pid2: % d/N", pid1, pid2 ); 14} The requirements are as follows: It is known

A Two-ary tree is a finite set of n (n>=0) nodes, either an empty set (a null binary tree) or a Saozi right subtree separated by a root node and two disjoint, respectively called the root node . Two-fork tree. two characteristics of the fork tree Each node has a maximum of two subtrees trees, so there are no nodes in the binary tree that are more than 2. (Note: Not all need two subtrees trees, but can be u

We all know that through the fork () system call we can create a new process that is as impressive as the current process. We usually refer to the new process as a child process, and the current process is called the parent process. The child process inherits the entire address space of the parent process, including the process context, the stack address, and the memory Information Process Control block ( PCB) and so on.　　1. Parent-Child processesSo l

Fork () and vfock () Both create a process. What is the difference between them? There are three differences:1. Fork (): The child process copies the data segment of the parent process, code segmentVfork (): The child process shares the data segment with the parent process.2. Fork (): the execution order of parent and child processes is unknown.Vfork ensures that

1. Fork Function # Inlcude Pid_t fork (void ); A new process created by fork is called a child process ). The fork function is called once and returns two times. The only difference between the two responses is that the return value of the child process is 0, while that of the parent process is the ID of the new Child