ldd(C)

ldd -- list dynamic dependencies

Syntax

ldd [-d | -r] file

Description

The ldd command lists the path names of all shared objects that would be loaded as a result of executing file. If file is a valid executable but does not require any shared objects, ldd succeeds, producing no output.

ldd may also be used to check the compatibility of file with the shared objects it uses. It does this by optionally printing warnings for any unresolved symbol references that would occur if file were executed.

ldd understands the following options:

-d: Check all references to data objects.
-r: Check references to both data objects and functions.

Only one of the -d and -r options may be given.

Diagnostics

ldd prints its record of shared object path names to stdout. The optional list of symbol resolution problems are printed to stderr. If file is not an executable file or cannot be opened for reading, a non-zero exit status is returned.

Warning

ldd does not list shared objects explicitly attached using dlopen(S).

ldd uses the same algorithm as the dynamic linker to locate shared objects.

Standards conformance