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http://www.idc-online.com/technical_references/pdfs/information_technology/The_UNIX_Kernel_support_of_the_Signals.pdf
THE UNIX KERNEL SUPPORT OF THE SIGNALS 1. In Uni x Sy ste m V.3, each ent ry in the k ernel pro cess table slot has an ar ray of sig na l fla g s, o n e for ea ch defin e d in the sy stem . 2. W hen a sig nal is g ene rated for a process, the ke r nel will set the correspondin g sign al
https://www.oreilly.com/library/view/understanding-the-linux/0596002130/ch01s06.html
An Overview of Unix Kernels Unix kernels provide an execution environment in which applications may run. Therefore, the kernel must implement a set of services and corresponding interfaces. Applications use … - Selection from Understanding the Linux Kernel, Second Edition [Book]
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://notes.shichao.io/apue/ch10/
If the system delivers the signal more than once, we say that the signals are queued. Most UNIX systems, however, do not queue signals unless they support the real-time extensions to POSIX.1. Instead, the UNIX kernel simply delivers the signal once. …
https://unix.stackexchange.com/questions/355280/how-signals-are-handled-in-kernel
The reason kernel code isn't interrupted by signals is that it can put kernel memory or hardware devices in an inconsistent state. Therefore the code is always given a chance to clean things up. Linux's kernel threads (i.e. threads of the kernel, listed with no corresponding executable in process lists) can't receive signals at all. More ...
https://www.unix.com/man-page/Linux/7/signal/
Unlike standard signals, real-time signals have no predefined meanings: the entire set of real-time signals can be used for application- defined purposes. The default action for an unhandled real-time signal is to terminate the receiving process. Real-time signals are distinguished by the following: 1.
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