September 2017
Intermediate to advanced
466 pages
9h 33m
English
Content preview from Go Systems Programming
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About Unix signals
Have you ever pressed Ctrl + C in order to stop a program from running? If yes, then you are already familiar with signals because Ctrl + C sends the SIGINT signal to the program.
Strictly speaking, Unix signals are software interrupts that can be accessed either by a name or number and offer a way of handling asynchronous events such as when a child process exits or a process is told to pause on a Unix system.
A program cannot handle all signals; some of them are non-catchable and non-ignorable. The SIGKILL and SIGSTOP signals cannot be caught, blocked, or ignored. The reason for this is that they provide the kernel and the root user a way of stopping any process. The SIGKILL signal, which is also known by the number 9, ...
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