316 lines
5.6 KiB
HTML
316 lines
5.6 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 LDCONFIG</TITLE>
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</HEAD><BODY>
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<H1>LDCONFIG</H1>
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Section: Linux Programmer's Manual (8)<BR>Updated: 2020-02-09<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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ldconfig - configure dynamic linker run-time bindings
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>/sbin/ldconfig</B> [<B>-nNvXV</B>] [<B>-f</B> <I>conf</I>] [<B>-C</B> <I>cache</I>] [<B>-r</B> <I>root</I>]
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<I>directory</I>...
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<P>
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<B>/sbin/ldconfig</B>
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<B>-l</B>
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[<B>-v</B>]
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<I>library</I>...
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<P>
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<B>/sbin/ldconfig</B>
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<B>-p</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>ldconfig</B>
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creates the necessary links and cache to the most recent shared
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libraries found in the directories specified on the command line,
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in the file
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<I>/etc/ld.so.conf</I>,
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and in the trusted directories,
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<I>/lib</I>
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and
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<I>/usr/lib</I>
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(on some 64-bit architectures such as x86-64,
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<I>/lib</I>
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and
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<I>/usr/lib</I>
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are the trusted directories for 32-bit libraries, while
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<I>/lib64</I>
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and
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<I>/usr/lib64</I>
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are used for 64-bit libraries).
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<P>
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The cache is used by the run-time linker,
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<I>ld.so</I>
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or
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<I>ld-linux.so</I>.
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<B>ldconfig</B>
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checks the header and filenames of the libraries it encounters when
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determining which versions should have their links updated.
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<P>
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<B>ldconfig</B>
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will attempt to deduce the type of ELF libraries (i.e., libc5 or libc6/glibc)
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based on what C libraries, if any, the library was linked against.
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<P>
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Some existing libraries do not contain enough information
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to allow the deduction of their type.
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Therefore, the
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<I>/etc/ld.so.conf</I>
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file format allows the specification of an expected type.
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This is used
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<I>only</I>
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for those ELF libraries which we can not work out.
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The format
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is "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.
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(This syntax also works on the command line.)
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Spaces are
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<I>not</I>
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allowed.
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Also see the
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<B>-p</B>
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option.
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<B>ldconfig</B>
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should normally be run by the superuser as it may require write
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permission on some root owned directories and files.
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<P>
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Note that
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<B>ldconfig</B>
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will only look at files that are named
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<I>lib*.so*</I>
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(for regular shared objects) or
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<I>ld-*.so*</I>
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(for the dynamic loader itself).
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Other files will be ignored.
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Also,
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<B>ldconfig</B>
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expects a certain pattern to how the symlinks are set up, like this
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example, where the middle file
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(<B>libfoo.so.1</B>
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here) is the SONAME for the library:
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<P>
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libfoo.so -> libfoo.so.1 -> libfoo.so.1.12
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<P>
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Failure to follow this pattern may result in compatibility issues
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after an upgrade.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="1"><B>-c</B> <I>fmt</I>, <B>--format=</B><I>fmt</I>
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<DD>
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(Since glibc 2.2)
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Cache format to use:
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<I>old</I>,
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<I>new</I>,
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or
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<I>compat</I>
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(default).
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<DT id="2"><B>-C </B><I>cache</I>
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<DD>
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Use
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<I>cache</I>
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instead of
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<I>/etc/ld.so.cache</I>.
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<DT id="3"><B>-f </B><I>conf</I>
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<DD>
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Use
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<I>conf</I>
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instead of
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<I>/etc/ld.so.conf</I>.
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<DT id="4"><B>-i</B>, <B>--ignore-aux-cache</B>
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<DD>
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(Since glibc 2.7)
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Ignore auxiliary cache file.
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<DT id="5"><B>-l</B>
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<DD>
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(Since glibc 2.2)
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Library mode.
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Manually link individual libraries.
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Intended for use by experts only.
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<DT id="6"><B>-n</B>
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<DD>
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Process only the directories specified on the command line.
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Don't process the trusted directories,
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nor those specified in
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<I>/etc/ld.so.conf</I>.
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Implies
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<B>-N</B>.
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<DT id="7"><B>-N</B>
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<DD>
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Don't rebuild the cache.
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Unless
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<B>-X</B>
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is also specified, links are still updated.
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<DT id="8"><B>-p</B>, <B>--print-cache</B>
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<DD>
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Print the lists of directories and candidate libraries stored in
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the current cache.
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<DT id="9"><B>-r </B><I>root</I>
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<DD>
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Change to and use
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<I>root</I>
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as the root directory.
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<DT id="10"><B>-v</B>, <B>--verbose</B>
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<DD>
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Verbose mode.
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Print current version number, the name of each directory as it
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is scanned, and any links that are created.
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Overrides quiet mode.
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<DT id="11"><B>-V</B>, <B>--version</B>
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<DD>
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Print program version.
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<DT id="12"><B>-X</B>
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<DD>
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Don't update links.
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Unless
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<B>-N</B>
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is also specified, the cache is still rebuilt.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>FILES</H2>
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<DL COMPACT>
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<DT id="13"><I>/lib/ld.so</I>
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<DD>
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Run-time linker/loader.
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<DT id="14"><I>/etc/ld.so.conf</I>
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<DD>
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File containing a list of directories, one per line,
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in which to search for libraries.
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<DT id="15"><I>/etc/ld.so.cache</I>
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<DD>
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File containing an ordered list of libraries found in the directories
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specified in
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<I>/etc/ld.so.conf</I>,
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as well as those found in the trusted directories.
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</DL>
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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?1+ldd">ldd</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?8+ld.so">ld.so</A></B>(8)
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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="16"><A HREF="#lbAB">NAME</A><DD>
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<DT id="17"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="18"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="19"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="20"><A HREF="#lbAF">FILES</A><DD>
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<DT id="21"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="22"><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: 00:06:13 GMT, March 31, 2021
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</BODY>
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</HTML>
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