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https://developer.ibm.com/technologies/linux/articles/l-user-space-apps/
The pipe is readable by the user-space application and writable by the kernel side. As of this writing, core dumps are the only application that can use a pipe with a usermode-helper. In this application (./fs/exec.c do_coredump()), the core dump is written through the pipe from kernel space to user space.
https://stackoverflow.com/questions/24444670/event-notification-from-kernel-space-to-user-space
How to notify the user space application whenever an event occurs in the kernel space? A hardware generates an interrupt when the data arrives at some GPIO. This data is copied to the kernel buffer. At this point, I want the driver to notify the application that it can call read function to copy the data form kernel buffer to user space buffer.
https://dev.framing.life/tracing/kernel-and-user-probes-magic/
Both kprobes and uprobes attach a probe - a breakpoint and a handler function - to code which is, or will be executing, in kernel- (that’s what “k” in kprobes stands for) or in user-space. During execution, probe gets access to the CPU registers, kernel and user stacks (if kernel is running in a process context) and memory, which allows handler to read and report (and sometimes - modify) the data available.
https://www.kernel.org/doc/html/latest/admin-guide/mm/userfaultfd.html
The Linux kernel user-space API guide; Working with the kernel development community; ... The Linux kernel user’s and administrator’s guide ... The current asynchronous model of the event delivery is optimal for single threaded non-cooperative userfaultfd manager implementations. A synchronous event delivery model can be added later as a ...
https://developer.ibm.com/technologies/linux/articles/l-kernel-memory-access/
As the kernel and user space exist in different virtual address spaces, there are special considerations for moving data between them. Explore the ideas behind virtual address spaces and the kernel APIs for data movement to and from user space, and learn some of …
https://www.win.tue.nl/~aeb/linux/lk/lk-12.html
It is easy to wait for a single event. Usually one does a (blocking) read() ... on Solaris), where the idea is that one does the copy from user space to kernel only once (by writing an array of struct pollfd's to /dev/poll) and gets only interesting information back ... Notification occurs via delivery of a signal.
https://www.kernel.org/doc/html/v4.12/gpu/drm-internals.html
This function prepares the passed in event for eventual delivery. If the event doesn’t get delivered (because the IOCTL fails later on, before queuing up anything) then the even must be cancelled and freed using drm_event_cancel_free().
https://www.linuxjournal.com/article/3985
May 01, 2000 · Now comes the tricky part: the kernel returns to user space. Return to user space happens from do_page_fault=>page_fault (entry.S), then the low-level exit code in entry.S is executed in this order: page_fault=>(called do_page_fault)=>error_code=> ret_from_exception=>(checks if return to user space)=> ret_with_reschedule=>(sees that current->signal is nonzero) =>calls do_signal
http://cs-pub.bu.edu/fac/richwest/cs591_w1/notes/wk3_pt2.PDF
CS591 (Spring 2001) Signals n Introduced in UNIX systems to simplify IPC. n Used by the kernel to notify processes of system events. n A signal is a short message sent to a process, or group of processes, containing the number identifying the signal. n No data is delivered with traditional signals. n POSIX.4 defines i/f for queueing & ordering RT signals w/ arguments.
https://unix.stackexchange.com/questions/80044/how-signals-work-internally
A signal is generated either by the kernel internally (for example, SIGSEGV when an invalid address is accessed, ... Programs can also turn off the delivery of signals ("blocked"), on a signal-by-signal basis. ... Signal User Space C Program.
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