Search results
Results from the WOW.Com Content Network
Linux also calls the threads of this process idle tasks. [2] In some APIs, PID 0 is also used as a special value that always refers to the calling thread, process, or process group. [3] [4] Process ID 1 is usually the init process primarily responsible for starting and shutting down the system. Originally, process ID 1 was not specifically ...
Version 7 Unix: /etc listing, showing init and rc Version 7 Unix: contents of an /etc/rc Bourne shell script. In Unix-based computer operating systems, init (short for initialization) is the first process started during booting of the operating system.
The systemd daemon serves as the root of the user space's process tree; the first process (PID 1) has a special role on Unix systems, as it replaces the parent of a process when the original parent terminates. Therefore, the first process is particularly well suited for the purpose of monitoring daemons.
Instead, the system simply redefines the "parent PID" field in the child process's data to be the process that is the "ancestor" of every other process in the system, whose PID generally has the value of 1 (one), and whose name is traditionally "init" (except in the Linux kernel 3.4 and above [more info below]).
The first process created in a PID namespace is assigned the process ID number 1 and receives most of the same special treatment as the normal init process, most notably that orphaned processes within the namespace are attached to it. This also means that the termination of this PID 1 process will immediately terminate all processes in its PID ...
Thus, the kernel stage initializes devices, mounts the root filesystem specified by the bootloader as read only, and runs Init (/sbin/init) which is designated as the first process run by the system (PID = 1). [19] A message is printed by the kernel upon mounting the file system, and by Init upon starting the Init process. [19]
/proc/PID/mem, a binary image representing the process's virtual memory, can only be accessed by a ptrace'ing process. /proc/PID/root, a symlink to the root path as seen by the process. For most processes this will be a link to / unless the process is running in a chroot jail. /proc/PID/status contains basic information about a process ...
The init process is special: It does not get signals that it does not want to handle, and thus it can ignore SIGKILL. [14] An exception from this rule is while init is ptraced on Linux. [15] [16] An uninterruptibly sleeping process may not terminate (and free its resources) even when sent SIGKILL. This is one of the few cases in which a UNIX ...