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Hands-On System Programming with Linux
book

Hands-On System Programming with Linux

by Kaiwan N. Billimoria, Tigran Aivazian
October 2018
Beginner content levelBeginner
794 pages
19h 23m
English
Packt Publishing
Content preview from Hands-On System Programming with Linux

The sigaction structure

The sigaction(2) system call takes three parameters, of which the second and third are of the same data type.

The first parameter int signum is the signal to trap. This straight away reveals an important point: signals are meant to be trapped one at a time—you can only trap one signal with a single call to sigaction. Do not attempt to be overly clever and do things such as pass a bitmask of signals (bitwise-ORed) together; that's a bug. Of course, you can always call sigaction multiple times or in a loop.

The data type of the second and third parameters is a pointer to a structure called, again, sigaction. The sigaction structure definition is as follows (from the header /usr/include/bits/sigaction.h):

/* Structure ...
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Publisher Resources

ISBN: 9781788998475Supplemental Content