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1 perry 1 ld.so
2 !!!ld.so
3 NAME
4 DESCRIPTION
5 ENVIRONMENT
6 FILES
7 SEE ALSO
8 BUGS
9 AUTHORS
10 ----
11 !!NAME
12
13
14 ld.so/ld-linux.so - dynamic linker/loader
15 !!DESCRIPTION
16
17
18 __ld.so__ loads the shared libraries needed by a program,
19 prepares the program to run, and then runs it. Unless
20 explicitly specified via the __-static__ option to
21 __ld__ during compilation, all Linux programs are
22 incomplete and require further linking at run
23 time.
24
25
26 The necessary shared libraries needed by the program are
27 searched for in the following order
28
29
30 o
31
32
33 Using the environment variable __LD_LIBRARY_PATH__
34 (__LD_AOUT_LIBRARY_PATH__ for a.out programs). Except if
35 the executable is a setuid/setgid binary, in which case it
36 is ignored.
37
38
39 o
40
41
42 From the cache file __/etc/ld.so.cache__ which contains a
43 compiled list of candidate libraries previously found in the
44 augmented library path.
45
46
47 o
48
49
50 In the default path __/usr/lib__, and then
51 __/lib__.
52 !!ENVIRONMENT
53
54
55 __LD_LIBRARY_PATH__
56
57
58 A colon-separated list of directories in which to search for
59 ELF libraries at execution-time. Similar to the __PATH__
60 environment variable.
61
62
63 __LD_PRELOAD__
64
65
66 A whitespace-separated list of additional, user-specified,
67 ELF shared libraries to be loaded before all others. This
68 can be used to selectively override functions in other
69 shared libraries. For setuid/setgid ELF binaries, only
70 libraries in the standard search directories that are also
71 setgid will be loaded.
72
73
74 __LD_TRACE_LOADED_OBJECTS__
75
76
77 If present, causes the program to list its dynamic library
78 dependencies, as if run by ldd, instead of running
79 normally.
80
81
82 __LD_BIND_NOW__
83
84
85 If present, causes the dynamic linker to resolve all symbols
86 at program startup instead of when they are first
87 referenced.
88
89
90 __LD_AOUT_LIBRARY_PATH__
91
92
93 A colon-separated list of directories in which to search for
94 a.out libraries at execution-time. Similar to the
95 __PATH__ environment variable.
96
97
98 __LD_AOUT_PRELOAD__
99
100
101 The name of an additional, user-specified, a.out shared
102 library to be loaded after all others. This can be used to
103 selectively override functions in other shared
104 libraries.
105
106
107 __LD_NOWARN__
108
109
110 Suppress warnings about a.out libraries with incompatible
111 minor version numbers.
112
113
114 __LD_KEEPDIR__
115
116
117 Don't ignore the directory in the names of a.out libraries
118 to be loaded. Use of this option is strongly
119 discouraged.
120 !!FILES
121
122
123 __/lib/ld.so__ a.out dynamic linker/loader
124
125
126 __/lib/ld-linux.so.*__
127
128
129 ELF dynamic linker/loader
130
131
132 __/etc/ld.so.cache__
133
134
135 File containing a compiled list of directories in which to
136 search for libraries and an ordered list of candidate
137 libraries.
138
139
140 __/etc/ld.so.preload__
141
142
143 File containing a whitespace separated list of ELF shared
144 libraries to be loaded before the program. libraries and an
145 ordered list of candidate libraries.
146
147
148 __lib*.so*__ shared libraries
149 !!SEE ALSO
150
151
152 ldd(1), ldconfig(8).
153 !!BUGS
154
155
156 Currently __ld.so__ has no means of unloading and
157 searching for compatible or newer version of
158 libraries.
159
160
161 __ld.so__ functionality is only available for executables
162 compiled using libc version 4.4.3 or greater.
163 !!AUTHORS
164
165
166 David Engel, Eric Youngdale, Peter !MacDonald, Hongjiu Lu,
167 Linus Torvalds, Lars Wirzenius and Mitch D'Souza (not
168 necessarily in that order).
169 ----
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