August 2011
Intermediate to advanced
552 pages
23h 48m
English
Content preview from Advanced Mac OS X Programming: The Big Nerd Ranch GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Signals
Signals are like software interrupts: they can be delivered to your program at any time due to a number of well-defined conditions, like when you write outside of your mapped memory pages, you will get sent a SIGBUS (bus error) or a SIGSEGV (segmentation violation) signal. If a subprocess of yours terminates, you will get a SIGCHLD (child stopped) signal. If your controlling terminal goes away, there is SIGHUP (terminal hung up), and if you use the alarm() function, you will get sent SIGALRM when the time expires. The system defines about 31 different signals, many of which deal with job control or specific hardware issues.
A signal is delivered to your program asynchronously whenever it enters the operating system, whether it be via ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.