]>
Commit | Line | Data |
---|---|---|
fea681da MK |
1 | .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl> |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
fea681da MK |
4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
fea681da MK |
13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
fea681da MK |
21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
fea681da MK |
24 | .\" |
25 | .\" This replaces an earlier man page written by Walter Harms | |
26 | .\" <walter.harms@informatik.uni-oldenburg.de>. | |
4b8c67d9 | 27 | .TH GSIGNAL 3 2017-09-15 "" "Linux Programmer's Manual" |
fea681da MK |
28 | .SH NAME |
29 | gsignal, ssignal \- software signal facility | |
30 | .SH SYNOPSIS | |
31 | .nf | |
32 | .B #include <signal.h> | |
68e4db0a | 33 | .PP |
fea681da | 34 | .B typedef void (*sighandler_t)(int); |
68e4db0a | 35 | .PP |
61474e1b | 36 | .BI "int gsignal(int " signum ); |
68e4db0a | 37 | .PP |
fea681da | 38 | .BI "sighandler_t ssignal(int " signum ", sighandler_t " action ); |
cc4615cc | 39 | .fi |
68e4db0a | 40 | .PP |
cc4615cc MK |
41 | .in -4n |
42 | Feature Test Macro Requirements for glibc (see | |
43 | .BR feature_test_macros (7)): | |
44 | .in | |
68e4db0a | 45 | .PP |
cc4615cc MK |
46 | .BR gsignal (), |
47 | .BR ssignal (): | |
51c612fb MK |
48 | Since glibc 2.19: |
49 | _DEFAULT_SOURCE | |
50 | Glibc 2.19 and earlier: | |
51 | _SVID_SOURCE | |
fea681da MK |
52 | .SH DESCRIPTION |
53 | Don't use these functions under Linux. | |
54 | Due to a historical mistake, under Linux these functions are | |
55 | aliases for | |
fb186734 | 56 | .BR raise (3) |
fea681da | 57 | and |
fb186734 | 58 | .BR signal (2), |
fea681da | 59 | respectively. |
dd3568a1 | 60 | .PP |
80b50848 | 61 | Elsewhere, on System V-like systems, these functions implement |
d9bfdb9c | 62 | software signaling, entirely independent of the classical |
d9a10d9d MK |
63 | .BR signal (2) |
64 | and | |
65 | .BR kill (2) | |
66 | functions. | |
c13182ef | 67 | The function |
63aa9df0 | 68 | .BR ssignal () |
fea681da MK |
69 | defines the action to take when the software signal with |
70 | number | |
71 | .I signum | |
72 | is raised using the function | |
63aa9df0 | 73 | .BR gsignal (), |
8bd58774 MK |
74 | and returns the previous such action or |
75 | .BR SIG_DFL . | |
fea681da | 76 | The function |
63aa9df0 | 77 | .BR gsignal () |
8bd58774 MK |
78 | does the following: if no action (or the action |
79 | .BR SIG_DFL ) | |
80 | was | |
fea681da MK |
81 | specified for |
82 | .IR signum , | |
83 | then it does nothing and returns 0. | |
8bd58774 | 84 | If the action |
0daa9e92 | 85 | .B SIG_IGN |
8bd58774 | 86 | was specified for |
fea681da MK |
87 | .IR signum , |
88 | then it does nothing and returns 1. | |
8bd58774 | 89 | Otherwise, it resets the action to |
0daa9e92 | 90 | .B SIG_DFL |
8bd58774 | 91 | and calls |
c4bb193f | 92 | the action function with argument |
fea681da MK |
93 | .IR signum , |
94 | and returns the value returned by that function. | |
95 | The range of possible values | |
96 | .I signum | |
9bc87ed0 | 97 | varies (often 1\(en15 or 1\(en17). |
af642253 ZL |
98 | .SH ATTRIBUTES |
99 | For an explanation of the terms used in this section, see | |
100 | .BR attributes (7). | |
101 | .TS | |
102 | allbox; | |
103 | lb lb lb | |
104 | l l l. | |
105 | Interface Attribute Value | |
106 | T{ | |
107 | .BR gsignal () | |
108 | T} Thread safety MT-Safe | |
109 | T{ | |
110 | .BR ssignal () | |
111 | T} Thread safety MT-Safe sigintr | |
112 | .TE | |
847e0d88 | 113 | .sp 1 |
47297adb | 114 | .SH CONFORMING TO |
68e1685c | 115 | These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. |
fea681da MK |
116 | They are called obsolete under most of these systems, and are |
117 | broken under Linux libc and glibc. | |
118 | Some systems also have | |
31e9a9ec | 119 | .BR gsignal_r () |
fea681da | 120 | and |
31e9a9ec | 121 | .BR ssignal_r (). |
47297adb | 122 | .SH SEE ALSO |
fea681da MK |
123 | .BR kill (2), |
124 | .BR signal (2), | |
125 | .BR raise (3) |