ldconfig - phpMan

LDCONFIG(8)                Linux Programmer’s Manual               LDCONFIG(8)



NAME
       /sbin/ldconfig - configure dynamic linker run time bindings

SYNOPSIS
       /sbin/ldconfig [ -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] directory ...
       /sbin/ldconfig -l [ -v ] library ...
       /sbin/ldconfig -p

DESCRIPTION
       ldconfig  creates the necessary links and cache to the most recent shared libraries
       found  in  the  directories  specified  on  the   command   line,   in   the   file
       /etc/ld.so.conf,  and in the trusted directories (/lib and /usr/lib).  The cache is
       used by the run-time linker, ld.so or ld-linux.so.  ldconfig checks the header  and
       file  names  of  the libraries it encounters when determining which versions should
       have their links updated.

       ldconfig will attempt to deduce the type of ELF libs  (ie.  libc5  or  libc6/glibc)
       based  on what C libs, if any, the library was linked against. Therefore, when mak-
       ing dynamic libraries, it is wise to explicitly link against libc (use -lc).

       Some existing libs do not contain enough information  to  allow  the  deduction  of
       their  type. Therefore, the /etc/ld.so.conf file format allows the specification of
       an expected type.  This is only used for those ELF libs which we can not work  out.
       The format is "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.  (This syn-
       tax also works on the command line.)  Spaces are not  allowed.   Also  see  the  -p
       option.   ldconfig should normally be run by the super-user as it may require write
       permission on some root owned directories and files.

OPTIONS
       -v     Verbose mode.  Print current version number, the name of each  directory  as
              it is scanned, and any links that are created.  Overrides quiet mode.

       -n     Only  process  directories specified on the command line.  Don’t process the
              trusted  directories  (/lib   and   /usr/lib)   nor   those   specified   in
              /etc/ld.so.conf.  Implies -N.

       -N     Don’t  rebuild  the  cache.   Unless  -X  is also specified, links are still
              updated.

       -X     Don’t update links.  Unless  -N  is  also  specified,  the  cache  is  still
              rebuilt.

       -f conf
              Use conf instead of /etc/ld.so.conf.

       -C cache
              Use cache instead of /etc/ld.so.cache.

       -r root
              Change to and use root as the root directory.

       -l     Library  mode.  Manually  link  individual  libraries.  Intended  for use by
              experts only.

       -p     Print the lists of directories and candidate libraries stored in the current
              cache.


FILES
       /lib/ld.so          run-time linker/loader
       /etc/ld.so.conf     File  containing a list of colon, space, tab, newline, or comma
                           spearated directories in which to search for libraries.
       /etc/ld.so.cache    File containing an ordered  list  of  libraries  found  in  the
                           directories specified in /etc/ld.so.conf.



GNU C Library                     2002-05-06                       LDCONFIG(8)

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