mirror of https://github.com/mkerrisk/man-pages
105 lines
2.9 KiB
Groff
105 lines
2.9 KiB
Groff
.\" Copyright (C) 2002 Andries Brouwer <aeb@cwi.nl>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" This replaces an earlier man page written by Walter Harms
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.\" <walter.harms@informatik.uni-oldenburg.de>.
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.TH GSIGNAL 3 2007-07-26 "" "Linux Programmer's Manual"
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.SH NAME
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gsignal, ssignal \- software signal facility
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.SH SYNOPSIS
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.nf
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.B #include <signal.h>
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.sp
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.B typedef void (*sighandler_t)(int);
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.sp
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.BI "int gsignal(int" signum );
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.sp
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.BI "sighandler_t ssignal(int " signum ", sighandler_t " action );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR gsignal (),
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.BR ssignal ():
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_SVID_SOURCE
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.SH DESCRIPTION
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Don't use these functions under Linux.
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Due to a historical mistake, under Linux these functions are
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aliases for
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.BR raise (3)
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and
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.BR signal (2),
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respectively.
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.LP
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Elsewhere, on System V-like systems, these functions implement
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software signaling, entirely independent of the classical
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.BR signal (2)
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and
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.BR kill (2)
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functions.
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The function
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.BR ssignal ()
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defines the action to take when the software signal with
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number
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.I signum
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is raised using the function
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.BR gsignal (),
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and returns the previous such action or
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.BR SIG_DFL .
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The function
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.BR gsignal ()
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does the following: if no action (or the action
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.BR SIG_DFL )
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was
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specified for
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.IR signum ,
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then it does nothing and returns 0.
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If the action
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.B SIG_IGN
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was specified for
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.IR signum ,
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then it does nothing and returns 1.
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Otherwise, it resets the action to
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.B SIG_DFL
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and calls
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the action function with parameter
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.IR signum ,
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and returns the value returned by that function.
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The range of possible values
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.I signum
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varies (often 1-15 or 1-17).
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.SH "CONFORMING TO"
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These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64.
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They are called obsolete under most of these systems, and are
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broken under Linux libc and glibc.
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Some systems also have
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.BR gsignal_r ()
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and
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.BR ssignal_r ().
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.SH "SEE ALSO"
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.BR kill (2),
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.BR signal (2),
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.BR raise (3)
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