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
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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
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37 .Nd configure the shared library cache
43 .Op Fl f Ar hints_file
48 utility is used to prepare a set of
50 for use by the dynamic linker
51 to facilitate quick lookup of shared libraries available in multiple
53 It scans a set of built-in system directories and any
55 specified on the command line (in the given order) looking for
56 shared libraries and stores the results in a system file to forestall
57 the overhead that would otherwise result from the directory search
58 operations the dynamic linker would have to perform to load the
59 required shared libraries.
63 may be specified; these are expected to contain directories
64 to scan for shared libraries.
65 Each directory's pathname must start on a new
67 Blank lines and lines starting with the comment character
70 Filenames must conform to the
72 pattern in order to be added to the hints file.
74 For security reasons, directories which are world or group-writable or which
75 are not owned by root produce warning messages and are skipped, unless
80 The shared libraries which are found will be automatically available for loading
81 if needed by the program being prepared for execution.
82 This obviates the need
83 for storing search paths within the executable.
87 environment variable can be used to override the use of
88 directories (or the order thereof) from the cache or to specify additional
89 directories where shared libraries might be found.
93 separated list of directory paths which are searched by
95 when it needs to load a shared library.
96 It can be viewed as the run-time
104 utility is typically run as part of the boot sequence.
106 The following options are recognized by
108 .Bl -tag -width indent
110 Generate the hints for 32-bit ABI shared libraries
111 on 64-bit systems that support running 32-bit binaries.
113 Generate the hints for a.out format shared libraries.
115 Generate the hints for ELF format shared libraries.
117 Rescan the previously configured directories.
118 This opens the previous hints
119 file and fetches the directory list from the header.
120 Any additional pathnames
121 on the command line are also processed.
122 This is the default action when no parameters are given.
123 .It Fl f Ar hints_file
124 Read and/or update the specified hints file, instead of the standard file.
125 This option is provided primarily for testing.
127 Run in insecure mode.
128 The security checks will not be performed.
130 Instead of replacing the contents of the hints file
131 with those found in the directories specified,
134 Directories recorded in the hints file by previous runs of
136 are also rescanned for new shared libraries.
138 List the current contents of the hints file
139 on the standard output.
140 The hints file is not modified.
142 directories stored in the hints file is included.
144 Do not scan the built-in system directory
146 for shared libraries.
148 Switch on verbose mode.
151 Special care must be taken when loading shared libraries into the address
155 Whenever such a program is run by any user except the owner of the program,
157 will only load shared libraries from the hints
161 is not used to search for libraries.
165 In addition to building a set of hints for quick lookup, it also serves to
166 specify the trusted collection of directories from which shared objects can
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 /var/run/ld-elf32.so.hints
183 .It Pa /var/run/ld32.so.hints
184 Conventional configuration files containing directory names for
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