1 .\" Copyright 1999 SuSE GmbH Nuernberg, Germany
2 .\" Author: Thorsten Kukuk <kukuk@suse.de>
4 .\" %%%LICENSE_START(GPLv2+_SW_3_PARA)
5 .\" This program is free software; you can redistribute it and/or
6 .\" modify it under the terms of the GNU General Public License as
7 .\" published by the Free Software Foundation; either version 2 of the
8 .\" License, or (at your option) any later version.
10 .\" This program is distributed in the hope that it will be useful,
11 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
12 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 .\" General Public License for more details.
15 .\" You should have received a copy of the GNU General Public
16 .\" License along with this manual; if not, see
17 .\" <http://www.gnu.org/licenses/>.
20 .\" Modified, 6 May 2002, Michael Kerrisk, <mtk.manpages@gmail.com>
21 .\" Change listed order of /usr/lib and /lib
22 .TH LDCONFIG 8 2017-09-15 "GNU" "Linux Programmer's Manual"
24 ldconfig \- configure dynamic linker run-time bindings
26 .BR /sbin/ldconfig " [" \-nNvXV "] [" \-f " \fIconf\fP] [" \-C " \fIcache\fP] [" \-r " \fIroot\fP]"
42 creates the necessary links and cache to the most recent shared
43 libraries found in the directories specified on the command line,
46 and in the trusted directories,
50 (on some 64-bit architectures such as x86-64,
54 are the trusted directories for 32-bit libraries, while
58 are used for 64-bit libraries).
60 The cache is used by the run-time linker,
65 checks the header and filenames of the libraries it encounters when
66 determining which versions should have their links updated.
69 will attempt to deduce the type of ELF libraries (i.e., libc5 or libc6/glibc)
70 based on what C libraries, if any, the library was linked against.
71 .\" The following sentence looks suspect
72 .\" (perhaps historical cruft) -- MTK, Jul 2005
73 .\" Therefore, when making dynamic libraries,
74 .\" it is wise to explicitly link against libc (use \-lc).
76 Some existing libraries do not contain enough information
77 to allow the deduction of their type.
80 file format allows the specification of an expected type.
83 for those ELF libraries which we can not work out.
85 is "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.
86 (This syntax also works on the command line.)
94 should normally be run by the superuser as it may require write
95 permission on some root owned directories and files.
98 .BR \-c " \fIfmt\fP, " \-\-format=\fIfmt\fP
111 .IR /etc/ld.so.cache .
117 .IR /etc/ld.so.conf .
118 .\" FIXME glibc 2.7 added -i
120 .BR \-i ", " \-\-ignore\-aux\-cache
122 .\" commit 27d9ffda17df4d2388687afd12897774fde39bcc
123 Ignore auxiliary cache file.
128 Manually link individual libraries.
129 Intended for use by experts only.
132 Process only the directories specified on the command line.
133 Don't process the trusted directories,
134 nor those specified in
135 .IR /etc/ld.so.conf .
140 Don't rebuild the cache.
143 is also specified, links are still updated.
145 .BR \-p ", " \-\-print\-cache
146 Print the lists of directories and candidate libraries stored in
152 as the root directory.
154 .BR \-v ", " \-\-verbose
156 Print current version number, the name of each directory as it
157 is scanned, and any links that are created.
158 Overrides quiet mode.
160 .BR \-V ", " \-\-version
161 Print program version.
167 is also specified, the cache is still rebuilt.
169 .\" FIXME Since glibc-2.3.4, "include" directives are supported in ld.so.conf
171 .\" FIXME Since glibc-2.4, "hwcap" directives are supported in ld.so.conf
175 Run-time linker/loader.
178 File containing a list of directories, one per line,
179 in which to search for libraries.
182 File containing an ordered list of libraries found in the directories
184 .IR /etc/ld.so.conf ,
185 as well as those found in the trusted directories.