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-'\" t
-.\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH bsd_signal 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-bsd_signal \- signal handling with BSD semantics
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.B typedef void (*sighandler_t)(int);
-.P
-.BI "sighandler_t bsd_signal(int " signum ", sighandler_t " handler );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR bsd_signal ():
-.nf
-    Since glibc 2.26:
-        _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-            && ! (_POSIX_C_SOURCE >= 200809L)
-    glibc 2.25 and earlier:
-        _XOPEN_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR bsd_signal ()
-function takes the same arguments, and performs the same task, as
-.BR signal (2).
-.P
-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
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR bsd_signal ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-Use of
-.BR bsd_signal ()
-should be avoided; use
-.BR sigaction (2)
-instead.
-.P
-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.
-.P
-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 STANDARDS
-None.
-.SH HISTORY
-4.2BSD, POSIX.1-2001.
-Removed in POSIX.1-2008,
-recommending the use of
-.BR sigaction (2)
-instead.
-.SH SEE ALSO
-.BR sigaction (2),
-.BR signal (2),
-.BR sysv_signal (3),
-.BR signal (7)