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DLADDR(3C)							    DLADDR(3C)

       dladdr, dladdr1 - translate address to symbolic information

       #include <dlfcn.h>

       int dladdr(void *address, Dl_info_t *dlip);

       int dladdr1(void *address, Dl_info_t *dlip, void **info, int flags);

       The dladdr() and dladdr1() functions determine if the specified address
       is located within one of the mapped objects that make  up  the  current
       applications  address  space.  An  address  is  deemed to fall within a
       mapped object when it is between the base address, and the _end address
       of  that	 object. See NOTES. If a mapped object fits this criteria, the
       symbol table made available to the runtime linker is searched to locate
       the nearest symbol to the specified address.  The nearest symbol is one
       that has a value less than or equal to the required address.

       The Dl_info_t structure must be preallocated by the user. The structure
       members are filled in by dladdr(), based on the specified address.  The
       Dl_info_t structure includes the following members:

	     const char	   *dli_fname;
	     void	   *dli_fbase;
	     const char	   *dli_sname;
	     void	   *dli_saddr;

       The Dl_info_t members provide the following information.

		    Contains a pointer	to  the	 filename  of  the  containing

		    Contains the base address of the containing object.

		    Contains  a	 pointer to the symbol name that is nearest to
		    the specified address.  This symbol either represents  the
		    exact address that was specified, or is the nearest symbol
		    with a lower address.

		    Contains the actual address of the symbol  pointed	to  by

       The dladdr1() function provides for addition information to be returned
       as specified by the flags argument:

			  Obtain the ELF symbol table entry  for  the  matched
			  symbol. The info argument points to a symbol pointer
			  as  defined  in  <sys/elf.h>	(Elf32_Sym  **info  or
			  Elf64_Sym  **info). Most of the information found in
			  an ELF symbol can only be  properly  interpreted  by
			  the  runtime	linker.	 However, there are two fields
			  that contain information useful  to  the  caller  of
			  dladdr1():  The  st_size  field contains the size of
			  the referenced item. The st_info field provides sym‐
			  bol  type and binding attributes. See the Linker and
			  Libraries Guild for more information.

			  Obtain the Link_map for the matched file.  The  info
			  argument  points to a Link_map pointer as defined in
			  <sys/link.h> (Link_map **info).

       If the specified address cannot be matched to a mapped object, a	 0  is
       returned.  Otherwise,  a	 non-zero  return  is  made and the associated
       Dl_info_t elements are filled.

       The dladdr() and dladdr1() functions are one of a family	 of  functions
       that  give  the	user  direct access to the dynamic linking facilities.
       These facilities are available to  dynamically-linked  processes	 only.
       See Linker and Libraries Guide.

       See attributes(5) for descriptions of the following attributes:

       │MT-Level       │ MT-Safe	 │

       ld(1),  dlclose(3C),  dldump(3C),  dlerror(3C),	dlopen(3C), dlsym(3C),

       Linker and Libraries Guide

       The Dl_info_t pointer elements point to	addresses  within  the	mapped
       objects. These pointers can become invalid if objects are removed prior
       to these elements use. See dlclose(3C).

       If no symbol is found to	 describe  the	specified  address,  both  the
       dli_sname and dli_saddr members are set to 0.

       If  the	address	 specified  exists within a mapped object in the range
       between the base address and the address of the first global symbol  in
       the  object, the reserved local symbol _START_ is returned. This symbol
       acts as a label representing the start  of  the	mapped	object.	 As  a
       label, this symbol has no size. The dli_saddr member is set to the base
       address of the associated object. The dli_sname member is  set  to  the
       symbol  name  _START_.  If  the flag argument is set to RTLD_DL_SYMENT,
       symbol information for _START_ is returned.

       If an object is acting as a filter, care should be  taken  when	inter‐
       preting	the  address  of  any  symbol  obtained using a handle to this
       object. For example, using dlsym(3C) to obtain the symbol _end for this
       object,	results in returning the address of the symbol _end within the
       filtee, not the filter. For more information on filters see the	Linker
       and Libraries Guide.

				  Feb 4, 2009			    DLADDR(3C)

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