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
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37 .Nd configure the shared library cache
42 .Op Fl f Ar hints_file
46 is used to prepare a set of
48 for use by the dynamic linker
49 to facilitate quick lookup of shared libraries available in multiple
50 directories. It scans a set of built-in system directories and any
52 specified on the command line (in the given order) looking for
53 shared libraries and stores the results in a system file to forestall
54 the overhead that would otherwise result from the directory search
55 operations the dynamic linker would have to perform to load the
56 required shared libraries.
58 Files named on the command line are expected to contain directories
59 to scan for shared libraries. Each directory's pathname must start on a new
60 line. Blank lines and lines starting with the comment character
64 For security reasons, directories which are world or group-writable or which
65 are not owned by root produce warning messages and are skipped, unless
70 The shared libraries which are found will be automatically available for loading
71 if needed by the program being prepared for execution.
72 This obviates the need
73 for storing search paths within the executable.
77 environment variable can be used to override the use of
78 directories (or the order thereof) from the cache or to specify additional
79 directories where shared libraries might be found.
83 separated list of directory paths which are searched by
85 when it needs to load a shared library.
86 It can be viewed as the run-time
93 is typically run as part of the boot sequence.
95 The following options are recognized by
97 .Bl -tag -width indent
99 Generate the hints for a.out format shared libraries.
101 Generate the hints for ELF format shared libraries.
103 Rescan the previously configured directories. This opens the previous hints
104 file and fetches the directory list from the header. Any additional pathnames
105 on the command line are also processed.
106 This is the default action when no parameters are given.
107 .It Fl f Ar hints_file
108 Read and/or update the specified hints file, instead of the standard file.
109 This option is provided primarily for testing.
111 Run in insecure mode. The security checks will not be performed.
113 Instead of replacing the contents of the hints file
114 with those found in the directories specified,
117 Directories recorded in the hints file by previous runs of
119 are also rescanned for new shared libraries.
121 List the current contents of the hints file
122 on the standard output.
123 The hints file is not modified. The list of
124 directories stored in the hints file is included.
126 Do not scan the built-in system directory
128 for shared libraries.
130 Switch on verbose mode.
133 Special care must be taken when loading shared libraries into the address
137 Whenever such a program is run,
139 will only load shared libraries from the hints
143 is not used to search for libraries.
144 Thus, the role of ldconfig is dual.
146 addition to building a set of hints for quick lookup, it also serves to
147 specify the trusted collection of directories from which shared objects can
150 .Bl -tag -width OBJFORMATxxx -compact
154 (see below) to determine whether
158 is the default. If set, its value should be either
164 .Bl -tag -width /var/run/ld-elf.so.hintsxxx -compact
165 .It Pa /var/run/ld.so.hints
166 Standard hints file for the a.out dynamic linker.
167 .It Pa /var/run/ld-elf.so.hints
168 Standard hints file for the ELF dynamic linker.
169 .It Pa /etc/ld.so.conf
170 Conventional configuration file containing directory names for
173 .It Pa /etc/ld-elf.so.conf
174 Conventional configuration file containing directory names for
177 .It Pa /etc/objformat
182 is the default. If present, it must consist of a single line
194 utility first appeared in SunOS 4.0, it appeared in its current form
198 Some security checks (for example, verifying root ownership of
199 added directories) are not performed when