160 lines
3.7 KiB
HTML
160 lines
3.7 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 INTRO</TITLE>
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</HEAD><BODY>
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<H1>INTRO</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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intro - introduction to library functions
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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Section 3 of the manual describes all library functions excluding the library
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functions (system call wrappers) described in Section 2,
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which implement system calls.
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<P>
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Many of the functions described in the section are part of the
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Standard C Library
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(<I>libc</I>).
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Some functions are part of other libraries (e.g.,
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the math library,
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<I>libm</I>,
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or the real-time library,
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<I>librt</I>)
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in which case the manual page will indicate the linker
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option needed to link against the required library
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(e.g.,
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<I>-lm</I>
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and
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<I>-lrt</I>,
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respectively,
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for the aforementioned libraries).
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<P>
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In some cases,
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the programmer must define a feature test macro in order to obtain
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the declaration of a function from the header file specified
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in the man page SYNOPSIS section.
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(Where required, these feature test macros must be defined before including
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<I>any</I>
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header files.)
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In such cases, the required macro is described in the man page.
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For further information on feature test macros, see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7).
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<A NAME="lbAD"> </A>
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<H2>CONFORMING TO</H2>
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Certain terms and abbreviations are used to indicate UNIX variants
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and standards to which calls in this section conform.
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See
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<B><A HREF="/cgi-bin/man/man2html?7+standards">standards</A></B>(7).
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<A NAME="lbAE"> </A>
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<H2>NOTES</H2>
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<A NAME="lbAF"> </A>
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<H3>Authors and copyright conditions</H3>
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Look at the header of the manual page source for the author(s) and copyright
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conditions.
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Note that these can be different from page to page!
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+intro">intro</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+errno">errno</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+capabilities">capabilities</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+credentials">credentials</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+environ">environ</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+libc">libc</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+math_error">math_error</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+path_resolution">path_resolution</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+pthreads">pthreads</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+signal">signal</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+standards">standards</A></B>(7)
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<A NAME="lbAH"> </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">DESCRIPTION</A><DD>
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<DT id="3"><A HREF="#lbAD">CONFORMING TO</A><DD>
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<DT id="4"><A HREF="#lbAE">NOTES</A><DD>
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<DL>
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<DT id="5"><A HREF="#lbAF">Authors and copyright conditions</A><DD>
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</DL>
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<DT id="6"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="7"><A HREF="#lbAH">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: 00:05:46 GMT, March 31, 2021
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</BODY>
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</HTML>
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