parent process การใช้

• The parent process and any unrelated processes will not be affected.
• Parents process knowledge informally in the home while teachers process knowledge formally in school.
• More generally, a child process will inherit the standard streams of its parent process.
• The default niceness for processes is inherited from its parent process and is usually 0.
• The parent process can either continue execution or wait for the child process to complete.
• The child process has an exact copy of all the memory segments of the parent process.
• The process ID of a parent process is obtainable by a getppid ( ) system call.
• The parent process passes this identifier to the system call to suspend execution until the child has exited.
• The first step is the validation of whether the parent process has sufficient authorization to create a process.
• When a child process is created, it inherits all the environment variables and their values from the parent process.
• When a process calls fork, it is deemed the parent process and the newly created process is its child.
• When a shell or process launches a new process, the child process inherits the mask from its parent process.
• This is fine if both processes are living in the same parent process space, started by the same user.
• Conversely, a child process whose parent process terminates before it does becomes an " orphan process ".
• In a Unix environment, the parent process of a daemon is often, but not always, the init process.
• If the cd command inherits the parent process'directory, then the objective of the command cd will never be achieved.
• A process can be orphaned unintentionally, such as when the parent process terminates or crashes, or a network connection is disconnected.
• Subordinate processes stop if they attempt to interact with a " context " that has completed because the parent process has stopped.
• Most operating systems allow the terminating process to provide a specific exit status to the system, which is made available to the parent process.
• Upon successful validation, the parent process is copied almost entirely, with changes only to the unique process id, parent process, and user-space.