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
|
357
數的映射取決於實作方式，而且不同的 Unix 系統會有所差異，雖然最前面的 12 個信號
通常採用相同的映射方式（例如，
SIGKILL
就是聲名狼籍之編號為 9 的信號）。一個好的
程式設計者總是會使用信號之可供人類閱讀的名稱，而絕對不會使用它的整數值。
信號的編號始於 1（通常就是
SIGHUP
），而且會繼續線性地向上成長。總共大約有 31 個
信號，但是多數程式只會固定使用其中幾個信號。沒有任何信號會使用值為
0
的編號，
這個特殊值就是所謂的
空信號
（
null signal
）。事實上，空信號並不是十分重要—它並不
會具有一個特殊的名稱—但是有些系統呼叫（例如
kill()
）會使用值為
0
的編號來代表
一種特殊情況。
你可以使用
kill -l
這道命令列出你的系統所支援的信號。
Linux 所支援的信號
表 10-1 列出了 Linux 所支援的信號。
表 10-1 信號列表
信號 說明 預定行為
SIGABRT 送出自
abort()
終止（terminate）並傾印
記憶體（core dump）
SIGALRM 送出自
alarm()
終止
SIGBUS 硬體或對齊錯誤 終止並傾印記憶體
SIGCHLD 子行程已被終止 忽略
SIGCONT 行程中止後繼續執行 忽略
SIGFPE 算術例外事件 終止並傾印記憶體
SIGHUP 行程的控制終端機被關閉（最常見的情況是，用戶登出
系統）
終止
SIGILL 行程試圖執行一個非法指令 終止並傾印記憶體
SIGINT 用戶產生了中斷字符（Ctrl-C） 終止
SIGIO 非同步
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