.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
-.\"
+.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
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+.\"
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.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
.\"
.\" This replaces an earlier man page written by Walter Harms
.\" <walter.harms@informatik.uni-oldenburg.de>.
-.TH GSIGNAL 3 2002-08-25 "notGNU" "Linux Programmer's Manual"
+.TH GSIGNAL 3 2020-04-11 "" "Linux Programmer's Manual"
.SH NAME
gsignal, ssignal \- software signal facility
.SH SYNOPSIS
.nf
.B #include <signal.h>
-.sp
+.PP
.B typedef void (*sighandler_t)(int);
-.sp
-.BI "int gsignal(" signum );
-.sp
+.PP
+.BI "int gsignal(int " signum );
+.PP
.BI "sighandler_t ssignal(int " signum ", sighandler_t " action );
+.fi
+.PP
+.in -4n
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.in
+.PP
+.BR gsignal (),
+.BR ssignal ():
+ Since glibc 2.19:
+ _DEFAULT_SOURCE
+ Glibc 2.19 and earlier:
+ _SVID_SOURCE
.SH DESCRIPTION
Don't use these functions under Linux.
Due to a historical mistake, under Linux these functions are
aliases for
-.BR raise ()
+.BR raise (3)
and
-.BR signal (),
+.BR signal (2),
respectively.
-.LP
+.PP
Elsewhere, on System V-like systems, these functions implement
-software signalling, entirely independent of the classical
-signal and kill functions. The function
+software signaling, entirely independent of the classical
+.BR signal (2)
+and
+.BR kill (2)
+functions.
+The function
.BR ssignal ()
defines the action to take when the software signal with
number
.I signum
is raised using the function
.BR gsignal (),
-and returns the previous such action or SIG_DFL.
+and returns the previous such action or
+.BR SIG_DFL .
The function
.BR gsignal ()
-does the following: if no action (or the action SIG_DFL) was
+does the following: if no action (or the action
+.BR SIG_DFL )
+was
specified for
.IR signum ,
then it does nothing and returns 0.
-If the action SIG_IGN was specified for
+If the action
+.B SIG_IGN
+was specified for
.IR signum ,
then it does nothing and returns 1.
-Otherwise, it resets the action to SIG_DFL and calls
-the action function with parameter
+Otherwise, it resets the action to
+.B SIG_DFL
+and calls
+the action function with argument
.IR signum ,
and returns the value returned by that function.
The range of possible values
.I signum
-varies (often 1-15 or 1-17).
-.SH "CONFORMING TO"
+varies (often 1\(en15 or 1\(en17).
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface Attribute Value
+T{
+.BR gsignal ()
+T} Thread safety MT-Safe
+T{
+.BR ssignal ()
+T} Thread safety MT-Safe sigintr
+.TE
+.sp 1
+.SH CONFORMING TO
These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64.
They are called obsolete under most of these systems, and are
-broken under Linux libc and glibc.
+broken under
+.\" Linux libc and
+glibc.
Some systems also have
.BR gsignal_r ()
and
.BR ssignal_r ().
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR kill (2),
.BR signal (2),
.BR raise (3)
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