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https://www.oreilly.com/library/view/understanding-the-linux/0596005652/ch11s03.html
Delivering a Signal. We assume that the kernel noticed the arrival of a signal and invoked one of the functions mentioned in the previous sections to prepare the process descriptor of the process that is supposed to receive the signal. But in case that process was not running on the CPU at that moment,...
https://www.win.tue.nl/~aeb/linux/lk/lk-5.html
Certain user actions will make the kernel send a signal to a process or group of processes: typing the interrupt character (probably Ctrl-C) causes SIGINT to be sent, typing the quit character (probably Ctrl-\) sends SIGQUIT, hanging up the phone (modem) sends SIGHUP, typing the stop character (probably Ctrl-Z) sends SIGSTOP.
https://www.linuxjournal.com/article/3985
May 01, 2000 · Signals can be sent from system calls, interrupts and bottom-half handlers (see sidebar) alike; there is no difference. In other words, the Linux signal queue is interrupt-safe, as strange and recursive as that sounds, so it's fairly flexible. Bottom-Half Handlers. An interesting signal-delivery case, however, is on SMP.
https://stackoverflow.com/questions/43087549/how-signals-are-handled-in-kernel
How are the signals handled in the kernel. What happens internally if I send a kill signal to a kernel thread/process. Does a crash in kernel process means kernel panic always, if not will it …
https://www.youtube.com/watch?v=dLo408uz7KM
Dec 12, 2014 · A small video illustrating signal delivery mechanism in linux. The different states of threads are explored and analysed using kernelshark. A library to send signal to all threads in a process is...Author: Prem Swaroop
http://cs-pub.bu.edu/fac/richwest/cs591_w1/notes/wk3_pt2.PDF
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://linux.die.net/man/7/signal
Linux supports both POSIX reliable signals (hereinafter "standard signals") and POSIX real-time signals. Signal dispositions Each signal has a current disposition , which determines how the process behaves when it is delivered the signal.
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