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-.\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" %%%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.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" 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-.\" manual page may be incorrect or out-of-date.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
-.\" the use of the information contained herein.  The author(s) may not
-.\" 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.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.TH BSD_SIGNAL 3 2013-10-22 "" "Linux Programmer's Manual"
-.SH NAME
-bsd_signal \- signal handling with BSD semantics
-.SH SYNOPSIS
-.BR "#define _XOPEN_SOURCE" "       /* See feature_test_macros(7) */"
-.br
-.B #include <signal.h>
-.sp
-.B typedef void (*sighandler_t)(int);
-.sp
-.BI "sighandler_t bsd_signal(int " signum ", sighandler_t " handler );
-.SH DESCRIPTION
-The
-.BR bsd_signal ()
-function takes the same arguments, and performs the same task, as
-.BR signal (2).
-
-The difference between the two is that
-.BR bsd_signal ()
-is guaranteed to provide reliable signal semantics, that is:
-a) the disposition of the signal is not reset to the default
-when the handler is invoked;
-b) delivery of further instances of the signal is blocked while
-the signal handler is executing; and
-c) if the handler interrupts a blocking system call,
-then the system call is automatically restarted.
-A portable application cannot rely on
-.BR signal (2)
-to provide these guarantees.
-.SH RETURN VALUE
-The
-.BR bsd_signal ()
-function returns the previous value of the signal handler, or
-.B SIG_ERR
-on error.
-.SH ERRORS
-As for
-.BR signal (2).
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR bsd_signal ()
-function is thread-safe.
-.SH CONFORMING TO
-4.2BSD, POSIX.1-2001.
-POSIX.1-2008 removes the specification of
-.BR bsd_signal (),
-recommending the use of
-.BR sigaction (2)
-instead.
-.SH NOTES
-Use of
-.BR bsd_signal ()
-should be avoided; use
-.BR sigaction (2)
-instead.
-
-On modern Linux systems,
-.BR bsd_signal ()
-and
-.BR signal (2)
-are equivalent.
-But on older systems,
-.BR signal (2)
-provided unreliable signal semantics; see
-.BR signal (2)
-for details.
-
-The use of
-.I sighandler_t
-is a GNU extension;
-this type is defined only if the
-.B _GNU_SOURCE
-feature test macro is defined.
-.SH SEE ALSO
-.BR sigaction (2),
-.BR signal (2),
-.BR sysv_signal (3),
-.BR signal (7)
-.SH COLOPHON
-This page is part of release 3.79 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
-\%http://www.kernel.org/doc/man\-pages/.