132 lines
3.5 KiB
HTML
132 lines
3.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of ASSERT_PERROR</TITLE>
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</HEAD><BODY>
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<H1>ASSERT_PERROR</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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assert_perror - test errnum and abort
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#define _GNU_SOURCE</B> /* See <A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A>(7) */
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<B>#include <<A HREF="file:///usr/include/assert.h">assert.h</A>></B>
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<B>void assert_perror(int </B><I>errnum</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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If the macro
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<B>NDEBUG</B>
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was defined at the moment
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<I><<A HREF="file:///usr/include/assert.h">assert.h</A>></I>
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was last included, the macro
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<B>assert_perror</B>()
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generates no code, and hence does nothing at all.
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Otherwise, the macro
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<B>assert_perror</B>()
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prints an error message to standard error and terminates the program
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by calling
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<B><A HREF="/cgi-bin/man/man2html?3+abort">abort</A></B>(3)
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if
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<I>errnum</I>
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is nonzero.
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The message contains the filename, function name and
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line number of the macro call, and the output of
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<I>strerror(errnum)</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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No value is returned.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>assert_perror</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<P>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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This is a GNU extension.
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<A NAME="lbAH"> </A>
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<H2>BUGS</H2>
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The purpose of the assert macros is to help programmers find bugs in
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their programs, things that cannot happen unless there was a coding mistake.
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However, with system or library calls the situation is rather different,
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and error returns can happen, and will happen, and should be tested for.
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Not by an assert, where the test goes away when
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<B>NDEBUG</B>
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is defined,
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but by proper error handling code.
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Never use this macro.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+abort">abort</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+assert">assert</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+exit">exit</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+strerror">strerror</A></B>(3)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="5"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="6"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="7"><A HREF="#lbAH">BUGS</A><DD>
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<DT id="8"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="9"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:35 GMT, March 31, 2021
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