| LDCONFIG(8) | System Manager's Manual | LDCONFIG(8) | 
ldconfig —
| ldconfig | [ -cmrsSv] [directory
      ...] | 
ldconfig is used to prepare a set of
  “hints” for use by the a.out run-time linker
  ld.so to facilitate quick lookup of shared libraries
  available in multiple directories. ldconfig is only
  available on systems that use the “a.out” format for executables
  and libraries – on ELF systems, all the work is done by
  ld.elf_so.
By default, it scans a set of built-in system directories,
    directories listed in /etc/ld.so.conf, and any
    directories specified on the command line (in the
    given order) looking for shared libraries and stores the results in the file
    /var/run/ld.so.hints to forestall the overhead that
    would otherwise result from the directory search operations
    ld.so would have to perform to load required shared
    libraries.
The shared libraries so found will be automatically available for loading if needed by the program being prepared for execution. This obviates the need for storing search paths within the executable.
The LD_LIBRARY_PATH environment variable
    can be used to override the use of directories (or the order thereof) from
    the cache or to specify additional directories where shared libraries might
    be found. LD_LIBRARY_PATH is a ‘:’
    separated list of directory paths that are searched by
    ld.so when it needs to load a shared library. It can
    be viewed as the run-time equivalent of the -L
    switch of ld.
ldconfig is typically run as part of the
    boot sequence.
The following options are recognized by
    ldconfig:
-c-m-r-s-S-vldconfig utility first appeared in SunOS 4.0, it
  appeared in its current form in NetBSD 0.9A.
ld.so will only load shared libraries from the
  ld.so.hints file. In particular, the
  LD_LIBRARY_PATH and LD_PRELOAD
  is not used to search for libraries. Thus, the role of ldconfig is dual. In
  addition to building a set of hints for quick lookup, it also serves to
  specify the trusted collection of directories from which shared objects can be
  safely loaded. It is presumed that the set of directories specified to
  ldconfig is under control of the system's
  administrator. ld.so further assists set-user-ID
  programs by erasing the LD_LIBRARY_PATH and
  LD_PRELOAD from the environment.
| October 8, 2000 | NetBSD 9.4 |