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In a system call, if you want to perform multiple interactions with system commands, both the system function and popen are not competent, and the popen is a one-way pipeline.Either get the standard output from it or write the standard input to it.

Abstract: This section describes some basic operations on a process. Through this section, we will learn how to generate a sub-process, how the process changes its execution image, and synchronization of parent and child processes. We also learned

3) getting started with Linux programming-File OperationsFile Operations in LinuxPreface:In this section, we will discuss various functions for file operations in Linux.File Creation and read/writeFile AttributesDirectory file operationsMPs queue

Proxy source code analysis: Linux Network Programming Technology-Linux general technology-Linux programming and kernel information. The following is a detailed description. Linux is a very reliable operating system, but all friends who have used

The previous article learned about shared memory: http://www.cnblogs.com/charlesblc/p/6142139.htmlAccording to this http://blog.chinaunix.net/uid-26335251-id-3493125.htmlOne more article:1. Shared memory allows two or more processes to share a given

Differences between fcntl (), lockf, and flock in linux. What are the differences between fcntl (), lockf, and flock in linux? what are the differences between fcntl (), lockf, and flock? the functions of lvyilong316 are used to lock files? First,

# Include # Include # Include # Include # Include # Include Int main (){Int pipe_fd [2]; // pipeline IDPid_t pid;Char r_buffer [100];Char * w_buffer;Int ret; Memset (r_buffer, 0, sizeof (r_buffer )); If (pipe (pipe_fd) {Printf ("pipe create error \

Linux Network Programming-Server Model (zz) Address: http://study.pay500.com/1/s12212.htm In network programs, many clients usually correspond to one server. in order to process client requests, special requirements are put forward for the server

  This article introduces the ARM-based network image transmission technology. There are two threads: one is to complete the acquisition of USB camera images, and the other is to achieve remote transmission through the network. The image collection

I. Unix domain Protocol The Unix domain protocol is not an actual protocol family. It only communicates with a client-server on the same host, one method of using the same API (set interface or XTI) as communication between customers and servers on

Organized from Network Unix IPC includes: pipelines, named pipelines (FIFO), and signals (Signal)   Pipeline (pipe) Pipelines can be used for communications between kinship-related processes. Famous pipelines overcome the restriction that pipelines

 Once a process calls wait, it immediately blocks itself. Wait automatically analyzes whether a sub-process of the current process has exited. If it finds such a sub-process that has become a zombie, waitIt will collect information about this

Inter-process communication-pipelines-Linux Kernel Analysis (8)MPs queue A pipe is a one-way communication mechanism between two processes. Because pipelines transmit data in one direction, pipelines are also called half-duplex pipelines. This

Linux IPC (Inter-Process Communication, Inter-process Communication) pipeline learning, ipcinter-Process1. the standard Stream pipeline operation supports the file stream mode, which is used to create the pipeline linking another process. This blog

[Learning & understanding] process Switching Based on TSS and kernel stack, In Linux0.11, process switching is based on the TSS mechanism provided by intel. to switch from a process to another process, switch the TSS structure. However, this

We do not want to retain zombie processes because they occupy the kernel space and eventually lead to depletion of the city's resources. To prevent sub-processes from becoming botnets, all sub-processes generated by fork must be wait. # Include "

A simple procedure for back-to-Server:1. The client reads a line of text from the standard input and writes it to the server.2. The server reads this line of text from the network input and returns it to the customer.3. The client reads this line of

Fork is not allowed in multi-threaded programs Code of design for C ++ on UNIX 3 Criterion 3: fork is not allowed in multithreaded programs When fork is used in a multi-threaded program, it may cause various problems. A typical example is that the

Shared memory is the most useful communication method between processes and the fastest IPC format. The shared memory of two different processes A and B means that the same physical memory is mapped to the process address space of process a and

To work properly, the daemon should be implemented as a single instance, that is, to run only one copy of the daemon at any time, because the daemon needs to access a device. The file lock mechanism is used here. If the daemon creates a file and