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fea681da MK |
1 | .\" Copyright 1995-2000 David Engel (david@ods.com) |
2 | .\" Copyright 1995 Rickard E. Faith (faith@cs.unc.edu) | |
3 | .\" Copyright 2000 Ben Collins (bcollins@debian.org) | |
4 | .\" Redone for GLibc 2.2 | |
5 | .\" Copyright 2000 Jakub Jelinek (jakub@redhat.com) | |
6 | .\" Corrected. | |
7 | .\" Most of this was copied from the README file. | |
2297bf0e | 8 | .\" |
fd0fc519 | 9 | .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE) |
558f3367 | 10 | .\" Do not restrict distribution. |
fea681da | 11 | .\" May be distributed under the GNU General Public License |
fd0fc519 | 12 | .\" %%%LICENSE_END |
4784c377 | 13 | .\" |
460495ca | 14 | .TH LDD 1 2015-08-08 "" "Linux Programmer's Manual" |
fea681da | 15 | .SH NAME |
43151de3 | 16 | ldd \- print shared object dependencies |
fea681da | 17 | .SH SYNOPSIS |
1b369cc6 | 18 | .BR ldd " [\fIoption\fP]... \fIfile\fP..." |
fea681da MK |
19 | .SH DESCRIPTION |
20 | .B ldd | |
43151de3 MK |
21 | prints the shared objects (shared libraries) required by each program or |
22 | shared object specified on the command line. | |
ca93a9ed MK |
23 | .SS Security |
24 | In the usual case, | |
25 | .B ldd | |
26 | invokes the standard dynamic linker (see | |
053439c9 | 27 | .BR ld.so (8)) |
ca93a9ed MK |
28 | with the |
29 | .B LD_TRACE_LOADED_OBJECTS | |
30 | environment variable set to 1, | |
31 | which causes the linker to display the library dependencies. | |
32 | Be aware, | |
33 | however, | |
34 | that in some circumstances, some versions of | |
35 | .BR ldd | |
36 | may attempt to obtain the dependency information | |
37 | by directly executing the program. | |
38 | .\" Mainline glibc's ldd allows this possibility (the line | |
39 | .\" try_trace "$file" | |
40 | .\" in glibc 2.15, for example), but many distro versions of | |
41 | .\" ldd seem to remove that code path from the script. | |
42 | Thus, you should | |
43 | .I never | |
44 | employ | |
45 | .B ldd | |
46 | on an untrusted executable, | |
47 | since this may result in the execution of arbitrary code. | |
48 | A safer alternative when dealing with untrusted executables is: | |
49 | ||
72da9ef1 | 50 | $ objdump \-p /path/to/program | grep NEEDED |
fea681da MK |
51 | .SH OPTIONS |
52 | .TP | |
9de38bff | 53 | .B \-\-version |
fea681da MK |
54 | Print the version number of |
55 | .BR ldd . | |
56 | .TP | |
ed74a1a1 | 57 | .BR \-v ", " \-\-verbose |
75b94dc3 MK |
58 | Print all information, including, for example, |
59 | symbol versioning information. | |
fea681da | 60 | .TP |
ed74a1a1 | 61 | .BR \-u ", " \-\-unused |
46672d0d | 62 | Print unused direct dependencies. |
cd38a583 | 63 | (Since glibc 2.3.4.) |
46672d0d | 64 | .TP |
ed74a1a1 | 65 | .BR \-d ", " \-\-data\-relocs |
fea681da MK |
66 | Perform relocations and report any missing objects (ELF only). |
67 | .TP | |
ed74a1a1 | 68 | .BR \-r ", " \-\-function\-relocs |
fea681da MK |
69 | Perform relocations for both data objects and functions, and |
70 | report any missing objects or functions (ELF only). | |
71 | .TP | |
72 | .B \-\-help | |
73 | Usage information. | |
2fb50e2a MK |
74 | .\" .SH NOTES |
75 | .\" The standard version of | |
76 | .\" .B ldd | |
77 | .\" comes with glibc2. | |
78 | .\" Libc5 came with an older version, still present | |
79 | .\" on some systems. | |
80 | .\" The long options are not supported by the libc5 version. | |
81 | .\" On the other hand, the glibc2 version does not support | |
82 | .\" .B \-V | |
83 | .\" and only has the equivalent | |
84 | .\" .BR \-\-version . | |
85 | .\" .LP | |
86 | .\" The libc5 version of this program will use the name of a library given | |
87 | .\" on the command line as-is when it contains a \(aq/\(aq; otherwise it | |
88 | .\" searches for the library in the standard locations. | |
89 | .\" To run it | |
90 | .\" on a shared library in the current directory, prefix the name with "./". | |
fea681da MK |
91 | .SH BUGS |
92 | .B ldd | |
93 | does not work on a.out shared libraries. | |
94 | .PP | |
95 | .B ldd | |
96 | does not work with some extremely old a.out programs which were | |
97 | built before | |
98 | .B ldd | |
99 | support was added to the compiler releases. | |
100 | If you use | |
101 | .B ldd | |
102 | on one of these programs, the program will attempt to run with | |
aeb9b6a6 MK |
103 | .I argc |
104 | = 0 and the results will be unpredictable. | |
fea681da MK |
105 | .\" .SH AUTHOR |
106 | .\" David Engel. | |
107 | .\" Roland McGrath and Ulrich Drepper. | |
108 | .SH SEE ALSO | |
450c6969 | 109 | .BR pldd (1), |
cd22e342 | 110 | .BR sprof (1), |
fea681da MK |
111 | .BR ld.so (8), |
112 | .BR ldconfig (8) |