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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信號
|
379
SA_ONESHOT
這是一個已廢棄的 non-POSIX 旗標，等效於
SA_RESETHAND
（稍後會討論）。你可以使
用
SA_RESETHAND
來取代此旗標，不過你會在較舊的程式碼中看到此旗標。
SA_ONSTACK
此旗標用於指示系統在一個
替代的信號堆疊
（
alternative signal stack
）—提供自
sigaltstack()
—上調用所指定的信號處理程序。如果你並未提供一個替代的堆疊，
則會使用預定的堆疊—也就是，系統的行為如同你並未提供此旗標一樣。替代的信
號堆疊很少被用到，儘管它們可以被用在某些執行緒堆疊較小的 Pthread 應用程式
上，以避免某些信號處理程序把堆疊用光。本書並不會進一步探討
sigaltstack()
。
SA_RESTART
此旗標會使得遭信號中斷之系統呼叫以 BSD 的形式重新啟動。
SA_RESETHAND
此旗標會啟用「一次」（one-shot）模式。一旦從信號處理程序返回，該信號的行為
會被重置為預定方式。
sa_restorer
欄位已廢棄，而且不再用於 Linux。反正，它不是 POSIX 的一部分。就假
裝它不存在，不要跟它打交道。
執行成功時，
sigaction()
會傳回
0
。執行失敗時，則會傳回
-1
並把
errno
設定為下面其
中一個錯誤碼：
EFAULT
act
或
oldact
是一個無效的指標。
EINVAL
signo
是一個無效的信號、
SIGKILL
或
SIGSTOP
。
siginfo_t 結構
siginfo_t
結構也定義於
<sys/signal.h> ...
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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.