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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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
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
65 For security reasons, directories which are world or group-writable or which
66 are not owned by root produce warning messages and are skipped, unless
71 The shared libraries which are found will be automatically available for loading
72 if needed by the program being prepared for execution.
73 This obviates the need
74 for storing search paths within the executable.
78 environment variable can be used to override the use of
79 directories (or the order thereof) from the cache or to specify additional
80 directories where shared libraries might be found.
84 separated list of directory paths which are searched by
86 when it needs to load a shared library.
87 It can be viewed as the run-time
95 utility is typically run as part of the boot sequence.
97 The following options are recognized by
99 .Bl -tag -width indent
101 Generate the hints for a.out format shared libraries.
103 Generate the hints for ELF format shared libraries.
105 Rescan the previously configured directories. This opens the previous hints
106 file and fetches the directory list from the header. Any additional pathnames
107 on the command line are also processed.
108 This is the default action when no parameters are given.
109 .It Fl f Ar hints_file
110 Read and/or update the specified hints file, instead of the standard file.
111 This option is provided primarily for testing.
113 Run in insecure mode. The security checks will not be performed.
115 Instead of replacing the contents of the hints file
116 with those found in the directories specified,
119 Directories recorded in the hints file by previous runs of
121 are also rescanned for new shared libraries.
123 List the current contents of the hints file
124 on the standard output.
125 The hints file is not modified. The list of
126 directories stored in the hints file is included.
128 Do not scan the built-in system directory
130 for shared libraries.
132 Switch on verbose mode.
135 Special care must be taken when loading shared libraries into the address
139 Whenever such a program is run by any user except the owner of the program,
141 will only load shared libraries from the hints
145 is not used to search for libraries.
146 Thus, the role of ldconfig is dual.
148 addition to building a set of hints for quick lookup, it also serves to
149 specify the trusted collection of directories from which shared objects can
152 .Bl -tag -width OBJFORMATxxx -compact
156 (see below) to determine whether
160 is the default. If set, its value should be either
166 .Bl -tag -width /var/run/ld-elf.so.hintsxxx -compact
167 .It Pa /var/run/ld.so.hints
168 Standard hints file for the a.out dynamic linker.
169 .It Pa /var/run/ld-elf.so.hints
170 Standard hints file for the ELF dynamic linker.
171 .It Pa /etc/ld.so.conf
172 Conventional configuration file containing directory names for
175 .It Pa /etc/ld-elf.so.conf
176 Conventional configuration file containing directory names for
179 .It Pa /etc/objformat
184 is the default. If present, it must consist of a single line
196 utility first appeared in SunOS 4.0, it appeared in its current form
200 Some security checks (for example, verifying root ownership of
201 added directories) are not performed when