1 .\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
3 .\" %%%LICENSE_START(VERBATIM)
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.
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.
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14 .\" manual page may be incorrect or out-of-date.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
21 .\" Formatted or processed versions of this manual, if unaccompanied by
22 .\" the source, must acknowledge the copyright and authors of this work.
25 .\" This replaces an earlier man page written by Walter Harms
26 .\" <walter.harms@informatik.uni-oldenburg.de>.
27 .TH GSIGNAL 3 2015-07-23 "" "Linux Programmer's Manual"
29 gsignal, ssignal \- software signal facility
32 .B #include <signal.h>
34 .B typedef void (*sighandler_t)(int);
36 .BI "int gsignal(int " signum );
38 .BI "sighandler_t ssignal(int " signum ", sighandler_t " action );
42 Feature Test Macro Requirements for glibc (see
43 .BR feature_test_macros (7)):
50 Don't use these functions under Linux.
51 Due to a historical mistake, under Linux these functions are
58 Elsewhere, on System V-like systems, these functions implement
59 software signaling, entirely independent of the classical
66 defines the action to take when the software signal with
69 is raised using the function
71 and returns the previous such action or
75 does the following: if no action (or the action
80 then it does nothing and returns 0.
85 then it does nothing and returns 1.
86 Otherwise, it resets the action to
89 the action function with argument
91 and returns the value returned by that function.
92 The range of possible values
94 varies (often 1-15 or 1-17).
96 For an explanation of the terms used in this section, see
102 Interface Attribute Value
105 T} Thread safety MT-Safe
108 T} Thread safety MT-Safe sigintr
112 These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64.
113 They are called obsolete under most of these systems, and are
114 broken under Linux libc and glibc.
115 Some systems also have