dladdr man page on DigitalUNIX

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dladdr(3)							     dladdr(3)

NAME
       dladdr - translate address to symbolic information

SYNOPSIS
       #include <stdio.h> #define __EXTENSIONS__ #include <dlfcn.h>

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

PARAMETERS
       Specifies  the address for the symbol being sought.  Specifies the pre‐
       allocated Dl_info structure that dladdr() will fill  in	based  on  the
       specified address.

DESCRIPTION
       The dladdr() function is one of a family of routines that give the user
       direct access to the dynamic linking facilities. It can only be used in
       dynamically linked processes.

       The  dladdr()  function	determines  whether  the  specified address is
       located within one of the mapped	 objects  that	make  up  the  current
       application's  address  space.  An address is considered to be within a
       mapped object when it is between the base address and the  end  address
       of  that	 object.   If  a  mapped object fits this criteria, the loader
       searches the object's symbol table to locate the nearest symbol to  the
       specified address.

       The Dl_info structure includes the following members:

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

       Descriptions of these members are as follows: Pointer to the file  name
       of  the	containing object.  The base address of the containing object.
       Pointer to the symbol name nearest to the specified address. This  sym‐
       bol  either  had the same address or is the nearest symbol with a lower
       address.	 The actual address of the symbol pointed to by the  dli_sname
       member.

       The  Dl_info  pointer  elements	point  to  addresses within the mapped
       objects. These may become invalid if objects are removed prior to these
       elements being used (see dlclose(3)).

RETURN VALUES
       If  the	specified  address  cannot  be matched to a mapped object, a 0
       (zero) is returned. Otherwise, a nonzero returned is made and the asso‐
       ciated Dl_info elements are filled.

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

SEE ALSO
       Functions: dlclose(3), dlerror(3), dlopen(3), dlsym(3)

								     dladdr(3)
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