1 .\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
3 .\" Permission is granted to make and distribute verbatim copies of this
4 .\" manual provided the copyright notice and this permission notice are
5 .\" preserved on all copies.
7 .\" Permission is granted to copy and distribute modified versions of this
8 .\" manual under the conditions for verbatim copying, provided that the
9 .\" entire resulting derived work is distributed under the terms of a
10 .\" permission notice identical to this one.
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13 .\" manual page may be incorrect or out-of-date.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
14 .\" responsibility for errors or omissions, or for damages resulting from
15 .\" the use of the information contained herein. The author(s) may not
16 .\" have taken the same level of care in the production of this manual,
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 ¿®ÍêÀ¤Î¤¢¤ë
28 .\"WORD: unreliable ¿®ÍêÀ¤Ë·ç¤±¤ë
29 .\"WORD: signal semantics ¥·¥°¥Ê¥ë½èÍýÊý¼°
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 Êý¼°¤Î¥·¥°¥Ê¥ë½èÍý
38 .\"O .BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
39 .BR "#define _XOPEN_SOURCE" " /* feature_test_macros(7) »²¾È */"
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
55 ¤ÈƱ¤¸°ú¤¿ô¤ò¤È¤ê¡¢Æ±¤¸½èÍý¤ò¼Â¹Ô¤¹¤ë¡£
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 ¤Ç¤Ï¿®ÍêÀ¤Î¤¢¤ë¥·¥°¥Ê¥ë½èÍýÊý¼°¤ÎÄ󶡤¬Êݾڤµ¤ì¤Æ¤¤¤ë¤³¤È¤Ç¤¢¤ë¡£
72 ¿®ÍêÀ¤Î¤¢¤ë¥·¥°¥Ê¥ë½èÍýÊý¼°¤Ï°Ê²¼¤ÎÆÃħ¤ò»ý¤Ä¡£
73 a) ¥Ï¥ó¥É¥é¤¬µ¯Æ°¤µ¤ì¤¿¾ì¹ç¤Ë¡¢¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡ (disposition) ¤¬
74 ¥Ç¥Õ¥©¥ë¥È¤Ë¥ê¥»¥Ã¥È¤µ¤ì¤Ê¤¤¡¢
75 b) ¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Î¼Â¹ÔÃæ¤Ï¡¢¤½¤ì°Ê¹ß¤ËȯÀ¸¤·¤¿Æ±¤¸¥·¥°¥Ê¥ë¤ÎÇÛÁ÷¤¬
77 c) ¥Ï¥ó¥É¥é¤¬Ää»ßÃæ¤Î (blocking ¤·¤Æ¤¤¤ë) ¥·¥¹¥Æ¥à¥³¡¼¥ë¤ò
78 ÃæÃǤ·¤¿¾ì¹ç¡¢¤½¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬¼«Æ°Åª¤ËºÆ³«¤µ¤ì¤ë¡£
79 °Ü¿¢À¤¬É¬Íפʥ¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï¡¢
81 ¤Ç¤³¤ì¤é¤¬Êݾڤµ¤ì¤ë¤³¤È¤òÁ°Äó¤Ë¤¹¤Ù¤¤Ç¤Ï¤Ê¤¤¡£
82 .\"O .SH "RETURN VALUE"
85 .\"O .BR bsd_signal ()
86 .\"O function returns the previous value of the signal handler, or
90 ´Ø¿ô¤Ï¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤ÎľÁ°¤ÎÃͤòÊÖ¤¹¡£
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)
110 ¤Î»ÅÍͤ¬ºï½ü¤µ¤ì¤Æ¤¤¤ë¡£
113 ¤Î»ÈÍѤ¬¿ä¾©¤µ¤ì¤Æ¤¤¤ë¡£
117 .\"O .BR bsd_signal ()
118 .\"O should be avoided; use
119 .\"O .BR sigaction (2)
122 ¤Î»ÈÍѤÏÈò¤±¤ë¤Ù¤¤Ç¤¢¤ë¡£Âå¤ï¤ê¤Ë
126 .\"O On modern Linux systems,
127 .\"O .BR bsd_signal ()
131 .\"O But on older systems,
133 .\"O provided unreliable signal semantics; see
136 ºÇ¶á¤Î Linux ¥·¥¹¥Æ¥à¤Ç¤Ï¡¢
140 ¤ÏÅù²Á¤Ç¤¢¤ë¡£¤·¤«¤·¡¢°ÊÁ°¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¡¢
142 ¤Ï¿®ÍêÀ¤Ë·ç¤±¤ë¥·¥°¥Ê¥ë½èÍýÊý¼°¤òÄ󶡤·¤Æ¤¤¤¿¡£
149 .\"O is a GNU extension;
150 .\"O this type is only defined if the
152 .\"O feature test macro is defined.
154 ¤ò»È¤Ã¤Æ¤¤¤ë¤Î¤Ï GNU ¤Ë¤è¤ë³ÈÄ¥¤Ç¤¢¤ë¡£
155 ¤³¤Î·¿¤Ïµ¡Ç½¸¡ºº¥Þ¥¯¥í
157 ¤òÄêµÁ¤·¤¿¾ì¹ç¤Ë¤Î¤ßÄêµÁ¤µ¤ì¤ë¡£