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linux_man_pages_library

like 1

don't use these functions under linux.

due to a historical mistake, under linux these functions are

aliases for

.br raise (3)

and

.br signal (2),

respectively.

.pp

elsewhere, on system v-like systems, these functions implement

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

.br sig_dfl .

the function

.br gsignal ()

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

.b sig_ign

was specified for

.ir signum ,

then it does nothing and returns 1.

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\(en15 or 1\(en17).

.sh attributes

for an explanation of the terms used in this section, see

.br attributes (7).

.ad l

.nh

.ts

allbox;

lbx 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

.hy

.ad

.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.

some systems also have

.br gsignal_r ()

and

.br ssignal_r ().

.sh see also

.br kill (2),

.br signal (2),

.br raise (3)

.sh colophon

this page is part of release 5.13 of the linux

.i man-pages

project.

a description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.