Operation and Maintenance
Linux Operation and Maintenance
Can linux execute functions through child processes?
Can linux execute functions through child processes?
In Linux, related functions can be achieved by creating a subprocess and executing functions in the subprocess. This is achieved by using the "fork()" and "exec()" series of functions. The specific steps are as follows: 1. Use the "fork()" function to create a child process; 2. In the child process, use the "exec()" series of functions to execute specific functions.
The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.
In Linux, related functions can be achieved by creating a subprocess and executing functions in the subprocess. This can be achieved by using the fork() and exec() series of functions. The specific steps are as follows:
Use the fork() function to create a child process. fork() copies the code, data, and resources of the current process and creates a child process that is almost identical to the parent process. In the parent process, fork() returns the ID of the child process, while in the child process, fork() returns 0. By judging the return value of fork(), the program can distinguish the logical paths of the parent process and the child process.
In the child process, you can use the exec() series of functions to execute specific functions. For example, the execl() function can be used to execute a specified function in the child process.
The following is a simple example:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
void child_function() {
printf("This is the child process
");
// 子进程执行的逻辑处理
}
int main() {
pid_t pid = fork();
if (pid < 0) {
// 处理fork()错误的情况
fprintf(stderr, "Fork failed
");
exit(1);
} else if (pid == 0) {
// 子进程
child_function();
exit(0);
} else {
// 父进程
printf("This is the parent process
");
// 父进程执行的逻辑处理
// 等待子进程结束
wait(NULL);
printf("Child process completed
");
}
return 0;
}在上述示例中，通过fork()创建了一个子进程，在子进程中通过child_function()函数执行特定逻辑。父进程则可以执行自己的逻辑，并通过wait()等待子进程结束。It should be noted that the exec() series of functions will replace the image of the current process and directly load the new executable file or function, will not return the location of the original function. Therefore, if you need to execute a specific function in the child process, you can use library functions or other methods to complete it.
The above is the detailed content of Can linux execute functions through child processes?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
How to install software on Linux using the terminal?
Aug 02, 2025 pm 12:58 PM
There are three main ways to install software on Linux: 1. Use a package manager, such as apt, dnf or pacman, and then execute the install command after updating the source, such as sudoaptininstallcurl; 2. For .deb or .rpm files, use dpkg or rpm commands to install, and repair dependencies when needed; 3. Use snap or flatpak to install applications across platforms, such as sudosnapinstall software name, which is suitable for users who are pursuing version updates. It is recommended to use the system's own package manager for better compatibility and performance.
The Ultimate Guide to High-Performance Gaming on Linux
Aug 03, 2025 am 05:51 AM
ChoosePop!_OS,Ubuntu,NobaraLinux,orArchLinuxforoptimalgamingperformancewithminimaloverhead.2.InstallofficialNVIDIAproprietarydriversforNVIDIAGPUs,ensureup-to-dateMesaandkernelversionsforAMDandIntelGPUs.3.EnabletheperformanceCPUgovernor,usealow-latenc
What are the main pros and cons of Linux vs. Windows?
Aug 03, 2025 am 02:56 AM
Linux is suitable for old hardware, has high security and is customizable, but has weak software compatibility; Windows software is rich and easy to use, but has high resource utilization. 1. In terms of performance, Linux is lightweight and efficient, suitable for old devices; Windows has high hardware requirements. 2. In terms of software, Windows has wider compatibility, especially professional tools and games; Linux needs to use tools to run some software. 3. In terms of security, Linux permission management is stricter and updates are convenient; although Windows is protected, it is still vulnerable to attacks. 4. In terms of difficulty of use, the Linux learning curve is steep; Windows operation is intuitive. Choose according to requirements: choose Linux with performance and security, and choose Windows with compatibility and ease of use.
Understanding RAID Configurations on a Linux Server
Aug 05, 2025 am 11:50 AM
RAIDimprovesstorageperformanceandreliabilityonLinuxserversthroughvariousconfigurations;RAID0offersspeedbutnoredundancy;RAID1providesmirroringforcriticaldatawith50�pacityloss;RAID5supportssingle-drivefailuretoleranceusingparityandrequiresatleastthre
Linux how to enable and disable services at boot
Aug 08, 2025 am 10:23 AM
To manage the startup of Linux services, use the systemctl command. 1. Check the service status: systemctlstatus can check whether the service is running, enabled or disabled. 2. Enable the service startup: sudosystemctlenable, such as sudosystemctlenablenginx. If it is started at the same time, use sudosystemctlenable--nownginx. 3. Disable the service startup: sudosystemctldisable, such as sudosystemctldisablecups. If it is stopped at the same time, use sudosystemctldisabl
Linux how to list all running processes
Aug 08, 2025 am 06:42 AM
Usepsauxforacompletesnapshotofallrunningprocesses,showingdetailedinformationlikeUSER,PID,CPU,andmemoryusage.2.Usetoporhtopforreal-timemonitoringofprocesseswithdynamicupdates,wherehtopoffersamoreintuitiveinterface.3.UsepgreporpidoftoquicklyfindthePIDs
How to clean up your Linux system
Aug 22, 2025 am 07:42 AM
Removeunusedpackagesanddependencieswithsudoaptautoremove,cleanpackagecacheusingsudoaptcleanorautoclean,andremoveoldkernelsviasudoaptautoremove--purge.2.Clearsystemlogswithsudojournalctl--vacuum-time=7d,deletearchivedlogsin/var/log,andempty/tmpand/var
Linux how to view the contents of a file
Aug 19, 2025 pm 06:44 PM
ToviewfilecontentsinLinux,usedifferentcommandsbasedonyourneeds:1.Forsmallfiles,usecattodisplaytheentirecontentatonce,withcat-ntoshowlinenumbers.2.Forlargefiles,uselesstoscrollpagebypageorlinebyline,searchwith/search_term,andquitwithq.3.Usemoreforbasi
