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Why use setsid?
setsid is useful when you want to start a new session, because you have started to be connected to a new terminal — such as when starting a shell inside a terminal emulator — or you want a daemon (which you don’t want to be associated with a controlling terminal).
What is OS Setsid?
setsid creates a new session id for the command you run using it, so that it does not depend on your shell session. If the shell session is closed the other command will continue to run. Obviously, any output will have to be thrown away or stored in a log,file,database etc if you wish to check it at a later date.
What is Linux session?
Session usually refers to shell sessions. A shell is what allows you to interact with the computer. It acts as a bridge between the user and the kernel. Whenever you run a command, it is the shell that captures your intent and tells the kernel to do its thing.
What is Daemonic process?
A daemon process is a background process that is not under the direct control of the user. This process is usually started when the system is bootstrapped and it terminated with the system shut down. Usually the parent process of the daemon process is the init process.
What is OS Python?
The OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system-dependent functionality.
What is session process?
A session is a collection of process groups, which are either attached to a single terminal device (known as the controlling terminal) or not attached to any terminal.
When to use setsid to create a new session?
setsid () creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling terminal. The process group ID and session ID of the calling process are set to the PID of the calling process.
When to use setpgid before setsid ( )?
First of all: setsid () will make your process a process group leader, but it will also make you the leader of a new session. If you are just interested in getting your own process group, then use setpgid (0,0).
When to fork before or after setsid ( )?
Basically, if I want to detach a process from its controlling terminal and make it a process group leader : I use setsid (). Doing this without forking before doesn’t work. Why? First of all: setsid () will make your process a process group leader, but it will also make you the leader of a new session.
Is there any relation between setsid ( ) and handling SIGHUP signal?
Is there any relation between setsid () and handling SIGHUP signal. creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling terminal.