1 .\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
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7 .\" Permission is granted to copy and distribute modified versions of this
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12 .\" Since the Linux kernel and libraries are constantly changing, this
13 .\" manual page may be incorrect or out-of-date. The author(s) assume no
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17 .\" which is licensed free of charge, as they might when working
20 .\" Formatted or processed versions of this manual, if unaccompanied by
21 .\" the source, must acknowledge the copyright and authors of this work.
23 .\" Japanese Version Copyright (c) 2007 Akihiro MOTOKI
24 .\" all rights reserved.
25 .\" Translated 2007-06-02, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
27 .\"WORD: reliable 信頼性のある
28 .\"WORD: unreliable 信頼性に欠ける
29 .\"WORD: signal semantics シグナル処理方式
31 .TH BSD_SIGNAL 3 2009-03-15 "" "Linux Programmer's Manual"
34 .\"O bsd_signal \- signal handling with BSD semantics
35 bsd_signal \- BSD 方式のシグナル処理
38 .\"O .BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
39 .BR "#define _XOPEN_SOURCE" " /* feature_test_macros(7) 参照 */"
41 .B #include <signal.h>
43 .B typedef void (*sighandler_t)(int);
45 .BI "sighandler_t bsd_signal(int " signum ", sighandler_t " handler );
49 .\"O .BR bsd_signal ()
50 .\"O function takes the same arguments, and performs the same task, as
57 .\"O The difference between the two is that
58 .\"O .BR bsd_signal ()
59 .\"O is guaranteed to provide reliable signal semantics, that is:
60 .\"O a) the disposition of the signal is not reset to the default
61 .\"O when the handler is invoked;
62 .\"O b) delivery of further instances of the signal is blocked while
63 .\"O the signal handler is executing; and
64 .\"O c) if the handler interrupts a blocking system call,
65 .\"O then the system call is automatically restarted.
66 .\"O A portable application cannot rely on
68 .\"O to provide these guarantees.
71 では信頼性のあるシグナル処理方式の提供が保証されていることである。
72 信頼性のあるシグナル処理方式は以下の特徴を持つ。
73 a) ハンドラが起動された場合に、シグナルの処理方法 (disposition) が
75 b) シグナルハンドラの実行中は、それ以降に発生した同じシグナルの配送が
77 c) ハンドラが停止中の (blocking している) システムコールを
78 中断した場合、そのシステムコールが自動的に再開される。
81 でこれらが保証されることを前提にすべきではない。
82 .\"O .SH "RETURN VALUE"
85 .\"O .BR bsd_signal ()
86 .\"O function returns the previous value of the signal handler, or
100 .\"O .SH "CONFORMING TO"
102 4.2BSD, POSIX.1-2001.
103 .\"O POSIX.1-2008 removes the specification of
104 .\"O .BR bsd_signal (),
105 .\"O recommending the use of
106 .\"O .BR sigaction (2)
117 .\"O .BR bsd_signal ()
118 .\"O should be avoided; use
119 .\"O .BR sigaction (2)
126 .\"O On modern Linux systems,
127 .\"O .BR bsd_signal ()
131 .\"O But on older systems,
133 .\"O provided unreliable signal semantics; see
140 は等価である。しかし、以前のシステムでは、
142 は信頼性に欠けるシグナル処理方式を提供していた。
149 .\"O is a GNU extension;
150 .\"O this type is only defined if the
152 .\"O feature test macro is defined.
154 を使っているのは GNU による拡張である。