2 .\" Copyright (c) 1993 Paul Kranenburg
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
13 .\" 3. All advertising materials mentioning features or use of this software
14 .\" must display the following acknowledgement:
15 .\" This product includes software developed by Paul Kranenburg.
16 .\" 3. The name of the author may not be used to endorse or promote products
17 .\" derived from this software without specific prior written permission
19 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 .\" $FreeBSD: src/sbin/ldconfig/ldconfig.8,v 1.19.2.10 2003/05/13 19:25:19 trhodes Exp $
37 .Nd configure the shared library cache
42 .Op Fl f Ar hints_file
47 utility is used to prepare a set of
49 for use by the dynamic linker
50 to facilitate quick lookup of shared libraries available in multiple
51 directories. It scans a set of built-in system directories and any
53 specified on the command line (in the given order) looking for
54 shared libraries and stores the results in a system file to forestall
55 the overhead that would otherwise result from the directory search
56 operations the dynamic linker would have to perform to load the
57 required shared libraries.
59 Files named on the command line are expected to contain directories
60 to scan for shared libraries. Each directory's pathname must start on a new
61 line. Blank lines and lines starting with the comment character
64 Filenames must conform to the
66 pattern in order to be added to the hints file.
68 For security reasons, directories which are world or group-writable or which
69 are not owned by root produce warning messages and are skipped, unless
74 The shared libraries which are found will be automatically available for loading
75 if needed by the program being prepared for execution.
76 This obviates the need
77 for storing search paths within the executable.
81 environment variable can be used to override the use of
82 directories (or the order thereof) from the cache or to specify additional
83 directories where shared libraries might be found.
87 separated list of directory paths which are searched by
89 when it needs to load a shared library.
90 It can be viewed as the run-time
98 utility is typically run as part of the boot sequence.
100 The following options are recognized by
102 .Bl -tag -width indent
104 Generate the hints for a.out format shared libraries.
106 Generate the hints for ELF format shared libraries.
108 Rescan the previously configured directories. This opens the previous hints
109 file and fetches the directory list from the header. Any additional pathnames
110 on the command line are also processed.
111 This is the default action when no parameters are given.
112 .It Fl f Ar hints_file
113 Read and/or update the specified hints file, instead of the standard file.
114 This option is provided primarily for testing.
116 Run in insecure mode. The security checks will not be performed.
118 Instead of replacing the contents of the hints file
119 with those found in the directories specified,
122 Directories recorded in the hints file by previous runs of
124 are also rescanned for new shared libraries.
126 List the current contents of the hints file
127 on the standard output.
128 The hints file is not modified. The list of
129 directories stored in the hints file is included.
131 Do not scan the built-in system directory
133 for shared libraries.
135 Switch on verbose mode.
138 Special care must be taken when loading shared libraries into the address
142 Whenever such a program is run by any user except the owner of the program,
144 will only load shared libraries from the hints
148 is not used to search for libraries.
149 Thus, the role of ldconfig is dual.
151 addition to building a set of hints for quick lookup, it also serves to
152 specify the trusted collection of directories from which shared objects can
155 .Bl -tag -width OBJFORMATxxx -compact
159 (see below) to determine whether
163 is the default. If set, its value should be either
169 .Bl -tag -width /var/run/ld-elf.so.hintsxxx -compact
170 .It Pa /var/run/ld.so.hints
171 Standard hints file for the a.out dynamic linker.
172 .It Pa /var/run/ld-elf.so.hints
173 Standard hints file for the ELF dynamic linker.
174 .It Pa /etc/ld.so.conf
175 Conventional configuration file containing directory names for
178 .It Pa /etc/ld-elf.so.conf
179 Conventional configuration file containing directory names for
182 .It Pa /etc/objformat
187 is the default. If present, it must consist of a single line
199 utility first appeared in SunOS 4.0, it appeared in its current form
203 Some security checks (for example, verifying root ownership of
204 added directories) are not performed when