December 2013
Intermediate to advanced
496 pages
8h 57m
Chinese
Content preview from LINUX系統程式設計 第二版
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第十章
信號集
本章稍後我們將看到幾個需要操作「一組信號」（信號集）的函式，例如遭到行程阻擋
的一組信號，或是一組等待行程處理的信號。
信號集操作
（
signal set operation
）函式可
用於管理這些信號集：
#include <signal.h>
int sigemptyset (sigset_t *set);
int sigfillset (sigset_t *set);
int sigaddset (sigset_t *set, int signo);
int sigdelset (sigset_t *set, int signo);
int sigismember (const sigset_t *set, int signo);
sigemptyset()
用於初始化
set
所指定的信號集，以便清空它（將所有信號排除在信號集
之外）。
sigfillset()
用於初始化
set
所指定的信號集，以便填滿它（將所有信號納入信
號集）。這兩個函式都會傳回
0
。進一步使用信號集之前，你應該對信號集叫用其中一個
函式。
sigaddset()
用於把
signo
加入
set
所指定的信號集，而
sigdelset()
用於從
set
所指定的
信號集中移除
signo
。執行成功時，這兩個函式都會傳回
0
；發生錯誤時，則會傳回
-1
，
此狀況下，
errno
會被設定為錯誤碼
EINVAL
，表示
signo
是一個無效的信號識別字。
如果
signo
位於
set
所指定的信號集中，
sigismember()
會傳回
1
；如果不是，則傳回
0
；
如果發生錯誤 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.