198 lines
4.7 KiB
HTML
198 lines
4.7 KiB
HTML
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<HTML><HEAD><TITLE>Man page of BSD_SIGNAL</TITLE>
|
|
</HEAD><BODY>
|
|
<H1>BSD_SIGNAL</H1>
|
|
Section: Linux Programmer's Manual (3)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
|
|
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
|
|
|
|
<A NAME="lbAB"> </A>
|
|
<H2>NAME</H2>
|
|
|
|
bsd_signal - signal handling with BSD semantics
|
|
<A NAME="lbAC"> </A>
|
|
<H2>SYNOPSIS</H2>
|
|
|
|
<B>#include <<A HREF="file:///usr/include/signal.h">signal.h</A>></B>
|
|
|
|
<P>
|
|
|
|
<B>typedef void (*sighandler_t)(int);</B>
|
|
|
|
<P>
|
|
|
|
<B>sighandler_t bsd_signal(int </B><I>signum</I><B>, sighandler_t </B><I>handler</I><B>);</B>
|
|
|
|
<P>
|
|
|
|
|
|
Feature Test Macro Requirements for glibc (see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
|
|
|
|
|
|
<P>
|
|
|
|
|
|
<B>bsd_signal</B>():
|
|
|
|
<DL COMPACT><DT id="1"><DD>
|
|
Since glibc 2.26:
|
|
<BR> _XOPEN_SOURCE >= 500
|
|
|
|
<BR> && ! (_POSIX_C_SOURCE >= 200809L)
|
|
<BR>
|
|
|
|
Glibc 2.25 and earlier:
|
|
<BR> _XOPEN_SOURCE
|
|
</DL>
|
|
|
|
|
|
<A NAME="lbAD"> </A>
|
|
<H2>DESCRIPTION</H2>
|
|
|
|
The
|
|
<B>bsd_signal</B>()
|
|
|
|
function takes the same arguments, and performs the same task, as
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2).
|
|
|
|
<P>
|
|
|
|
The difference between the two is that
|
|
<B>bsd_signal</B>()
|
|
|
|
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
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2)
|
|
|
|
to provide these guarantees.
|
|
<A NAME="lbAE"> </A>
|
|
<H2>RETURN VALUE</H2>
|
|
|
|
The
|
|
<B>bsd_signal</B>()
|
|
|
|
function returns the previous value of the signal handler, or
|
|
<B>SIG_ERR</B>
|
|
|
|
on error.
|
|
<A NAME="lbAF"> </A>
|
|
<H2>ERRORS</H2>
|
|
|
|
As for
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2).
|
|
|
|
<A NAME="lbAG"> </A>
|
|
<H2>ATTRIBUTES</H2>
|
|
|
|
For an explanation of the terms used in this section, see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
|
|
|
|
<TABLE BORDER>
|
|
<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
|
|
<TR VALIGN=top><TD>
|
|
<B>bsd_signal</B>()
|
|
|
|
</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
|
|
</TABLE>
|
|
|
|
<A NAME="lbAH"> </A>
|
|
<H2>CONFORMING TO</H2>
|
|
|
|
4.2BSD, POSIX.1-2001.
|
|
POSIX.1-2008 removes the specification of
|
|
<B>bsd_signal</B>(),
|
|
|
|
recommending the use of
|
|
<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2)
|
|
|
|
instead.
|
|
<A NAME="lbAI"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
Use of
|
|
<B>bsd_signal</B>()
|
|
|
|
should be avoided; use
|
|
<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2)
|
|
|
|
instead.
|
|
<P>
|
|
|
|
On modern Linux systems,
|
|
<B>bsd_signal</B>()
|
|
|
|
and
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2)
|
|
|
|
are equivalent.
|
|
But on older systems,
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2)
|
|
|
|
provided unreliable signal semantics; see
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2)
|
|
|
|
for details.
|
|
<P>
|
|
|
|
The use of
|
|
<I>sighandler_t</I>
|
|
|
|
is a GNU extension;
|
|
this type is defined only if the
|
|
<B>_GNU_SOURCE</B>
|
|
|
|
feature test macro is defined.
|
|
<A NAME="lbAJ"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+sysv_signal">sysv_signal</A></B>(3),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?7+signal">signal</A></B>(7)
|
|
|
|
<A NAME="lbAK"> </A>
|
|
<H2>COLOPHON</H2>
|
|
|
|
This page is part of release 5.05 of the Linux
|
|
<I>man-pages</I>
|
|
|
|
project.
|
|
A description of the project,
|
|
information about reporting bugs,
|
|
and the latest version of this page,
|
|
can be found at
|
|
<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
|
|
<P>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="2"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
|
|
<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
|
|
<DT id="5"><A HREF="#lbAE">RETURN VALUE</A><DD>
|
|
<DT id="6"><A HREF="#lbAF">ERRORS</A><DD>
|
|
<DT id="7"><A HREF="#lbAG">ATTRIBUTES</A><DD>
|
|
<DT id="8"><A HREF="#lbAH">CONFORMING TO</A><DD>
|
|
<DT id="9"><A HREF="#lbAI">NOTES</A><DD>
|
|
<DT id="10"><A HREF="#lbAJ">SEE ALSO</A><DD>
|
|
<DT id="11"><A HREF="#lbAK">COLOPHON</A><DD>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:05:36 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|