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  2. Signal (IPC) - Wikipedia

    en.wikipedia.org/wiki/Signal_(IPC)

    Similarly, the kill(1) command allows a user to send signals to processes. The raise(3) library function sends the specified signal to the current process. Exceptions such as division by zero, segmentation violation , and floating point exception will cause a core dump and terminate the program.

  3. Booting process of Linux - Wikipedia

    en.wikipedia.org/wiki/Booting_process_of_Linux

    [14] initramfs, also known as early user space, has been available since version 2.5.46 of the Linux kernel, [18] with the intent to replace as many functions as possible that previously the kernel would have performed during the startup process. Typical uses of early user space are to detect what device drivers are needed to load the main user ...

  4. Kernel panic - Wikipedia

    en.wikipedia.org/wiki/Kernel_panic

    10.8 and later: The computer becomes unresponsive before it immediately reboots. After restarting, it shows a message for a few seconds informing the user that a problem caused the computer to restart, before continuing to boot. The message now includes a Chinese translation.

  5. fork (system call) - Wikipedia

    en.wikipedia.org/wiki/Fork_(system_call)

    In the original design of the VMS operating system (1977), a copy operation with subsequent mutation of the content of a few specific addresses for the new process as in forking was considered risky. [citation needed] Errors in the current process state may be copied to a child process. Here, the metaphor of process spawning is used: each ...

  6. User error - Wikipedia

    en.wikipedia.org/wiki/User_error

    Phrases used by the tech savvy to mean that a problem is caused entirely by the fault of the user include PEBKAC [8] (an acronym for "problem exists between keyboard and chair"), PEBCAK [9] (an alternative, but similar, acronym for "problem exists between chair and keyboard"), POBCAK (a US government/military acronym for "problem occurs between ...

  7. init - Wikipedia

    en.wikipedia.org/wiki/Init

    The root user typically changes the current runlevel by running the telinit or init commands. The /etc/inittab file sets the default runlevel with the :initdefault: entry. On Unix systems, changing the runlevel is achieved by starting only the missing services (as each level defines only those that are started / stopped).

  8. Scheduling (computing) - Wikipedia

    en.wikipedia.org/wiki/Scheduling_(computing)

    The process scheduler is a part of the operating system that decides which process runs at a certain point in time. It usually has the ability to pause a running process, move it to the back of the running queue and start a new process; such a scheduler is known as a preemptive scheduler, otherwise it is a cooperative scheduler. [5]

  9. Environment variable - Wikipedia

    en.wikipedia.org/wiki/Environment_variable

    Environment variables are part of the environment in which a process runs. For example, a running process can query the value of the TEMP environment variable to discover a suitable location to store temporary files, or the HOME or USERPROFILE variable to find the directory structure owned by the user running the process.