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-'\" t
-.\" Copyright (c) 2007 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sysv_signal 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sysv_signal \- signal handling with System V semantics
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
-.B #include <signal.h>
-.P
-.B typedef void (*sighandler_t)(int);
-.P
-.BI "sighandler_t sysv_signal(int " signum ", sighandler_t " handler );
-.fi
-.SH DESCRIPTION
-The
-.BR sysv_signal ()
-function takes the same arguments, and performs the same task, as
-.BR signal (2).
-.P
-However
-.BR sysv_signal ()
-provides the System V unreliable signal semantics, that is:
-a) the disposition of the signal is reset to the default
-when the handler is invoked;
-b) delivery of further instances of the signal is not blocked while
-the signal handler is executing; and
-c) if the handler interrupts (certain) blocking system calls,
-then the system call is not automatically restarted.
-.SH RETURN VALUE
-The
-.BR sysv_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 sysv_signal ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-Use of
-.BR sysv_signal ()
-should be avoided; use
-.BR sigaction (2)
-instead.
-.P
-On older Linux systems,
-.BR sysv_signal ()
-and
-.BR signal (2)
-were equivalent.
-But on newer systems,
-.BR signal (2)
-provides reliable 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 SEE ALSO
-.BR sigaction (2),
-.BR signal (2),
-.BR bsd_signal (3),
-.BR signal (7)