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Today, I would like to share with you the relevant knowledge points about how to achieve the daemon process in PHP. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Steps to become a daemon

In fact, you only need to create a child process and exit the parent process, and the work to be processed is carried out in the child process to implement a daemon. But just doing this, if the follow-up tasks are complex, or if some third-party packages are introduced, then strange problems may arise.

The coding specification for daemons is introduced in the book Advanced programming in UNIX Environment (English: Advanced Programming in the UNIX Environment, referred to as APUE). If we implement our daemons according to the specifications, we can avoid those strange problems. And the specification is not complicated, it only takes a few steps:

Create a child process and exit the parent process

The child process creates a new session and becomes session leader

Reset file mask

Change the working directory

Turn off standard input and output

Realize

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