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dladdr(3)                BSD Library Functions Manual                dladdr(3)


NAME

     dladdr -- find the image containing a given address


SYNOPSIS

     #include <dlfcn.h>

     int
     dladdr(const void* addr, Dl_info* info);


DESCRIPTION

     The dladdr() function queries dyld (the dynamic linker) for information
     about the image containing the address addr.  The information is returned
     in the structure specified by info.  The structure contains at least the
     following members:

     const char* dli_fname     The pathname of the shared object containing
                               the address.

     void* dli_fbase           The base address (mach_header) at which the
                               image is mapped into the address space of the
                               calling process.

     const char* dli_sname     The name of the nearest run-time symbol with a
                               value less than or equal to addr.

     void* dli_saddr           The value of the symbol returned in dli_sname.

     The dladdr() function is available only in dynamically linked programs.


ERRORS

     If an image containing addr cannot be found, dladdr() returns 0.  On suc-
     cess, a non-zero value is returned.

     If the image containing addr is found, but no nearest symbol was found,
     the dli_sname and dli_saddr fields are set to NULL.


SEE ALSO

     dyld(3), dlopen(3)


HISTORY

     The dladdr() function first appeared in the Solaris operating system.


AUTHORS

     Mac OS X 10.3 incorporated the dlcompat package written by Jorge Acereda
     <jacereda@users.sourceforge.net> and Peter O'Gorman <ogor-
     man@users.sourceforge.net>.

     In Mac OS X 10.4, dlopen was rewritten to be a native part of dyld.

     This man page was borrowed from FreeBSD and modified.


BUGS

     This implementation is almost bug-compatible with the Solaris implementa-
     tion.  The following bugs are present:

     o   Returning 0 as an indication of failure goes against long-standing
         Unix tradition.

BSD                           September 24, 2004                           BSD

Mac OS X 10.6 - Generated Thu Sep 17 20:19:30 CDT 2009
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