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
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9 .\" manual under the conditions for verbatim copying, provided that the
10 .\" entire resulting derived work is distributed under the terms of a
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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14 .\" manual page may be incorrect or out-of-date.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
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18 .\" which is licensed free of charge, as they might when working
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25 .\" This replaces an earlier man page written by Walter Harms
26 .\" <walter.harms@informatik.uni-oldenburg.de>.
27 .TH GSIGNAL 3 2017-09-15 "" "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 Glibc 2.19 and earlier:
53 Don't use these functions under Linux.
54 Due to a historical mistake, under Linux these functions are
61 Elsewhere, on System V-like systems, these functions implement
62 software signaling, entirely independent of the classical
69 defines the action to take when the software signal with
72 is raised using the function
74 and returns the previous such action or
78 does the following: if no action (or the action
83 then it does nothing and returns 0.
88 then it does nothing and returns 1.
89 Otherwise, it resets the action to
92 the action function with argument
94 and returns the value returned by that function.
95 The range of possible values
97 varies (often 1\(en15 or 1\(en17).
99 For an explanation of the terms used in this section, see
105 Interface Attribute Value
108 T} Thread safety MT-Safe
111 T} Thread safety MT-Safe sigintr
115 These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64.
116 They are called obsolete under most of these systems, and are
117 broken under Linux libc and glibc.
118 Some systems also have