dwarf_seterrarg(3) [freebsd man page]

DWARF_SETERRARG(3)					   BSD Library Functions Manual 					DWARF_SETERRARG(3)

NAME

     dwarf_seterrarg, dwarf_seterrhand -- configure error handling

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     Dwarf_Ptr
     dwarf_seterrarg(Dwarf_Debug dbg, Dwarf_Ptr arg);

     Dwarf_Handler
     dwarf_seterrhand(Dwarf_Debug dbg, Dwarf_Handler handler);

DESCRIPTION

     These functions may be used by applications to configure error handling callbacks.  The error handling scheme used by the library is
     described in dwarf(3).

     Function dwarf_seterrarg() may be used to set the callback argument passed to a configured error handler at the time it is invoked.  Argument
     arg is the callback argument being set.  Argument dbg can be a debug context allocated by a prior call to dwarf_init(3), or can be NULL to
     indicate that the library-wide callback argument is to be set.

     Function dwarf_seterrhand() may be used to associate an error handler denoted by argument handler with the DWARF debug context descriptor
     denoted by argument dbg.  Argument dbg should be a debug context allocated by a prior call to dwarf_init(3), or may be NULL to indicate that
     the library-wide error handler is to be set.

RETURN VALUES

     Function dwarf_seterrhand() returns the previous error handler associated with argument dbg.  If argument dbg is NULL, function
     dwarf_seterrhand() returns the previous library-wide error handler.

     Function dwarf_seterrarg() returns the previous callback argument associated with argument dbg.  If argument dbg is NULL, function
     dwarf_seterrarg() returns the previous library-wide callback argument.

COMPATIBILITY

     The behavior of these functions when argument dbg is NULL is a local extension.

ERRORS

     These functions do not set an error code.

SEE ALSO

     dwarf(3), dwarf_init(3)

BSD
								   May 01, 2010 							       BSD

DWARF_GET_STR(3)					   BSD Library Functions Manual 					  DWARF_GET_STR(3)

NAME

     dwarf_get_str -- retrieve a string from the DWARF string section

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_str(Dwarf_Debug dbg, Dwarf_Off offset, char **string, Dwarf_Signed *len, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_get_str() retrieves a NUL-terminated string from the DWARF string section ``.debug_str''.

     Argument dbg should reference a DWARF debug context allocated using dwarf_init(3).

     Argument offset should be an offset, relative to the ``.debug_str'' section, specifying the start of the desired string.

     Argument string should point to a location which will hold a returned pointer to a NUL-terminated string.

     Argument len should point to a location which will hold the length of the returned string.  The returned length does not include the space
     needed for the NUL-terminator.

     If argument err is not NULL, it will be used to store error information in case of an error.

RETURN VALUES

     Function dwarf_get_str() returns DW_DLV_OK when it succeeds.  It returns DW_DLV_NO_ENTRY if there is no ``.debug_str'' section associated
     with the specified debugging context, or if the provided offset offset is at the very end of ``.debug_str'' section.  In case of an error, it
     returns DW_DLV_ERROR and sets the argument err.

ERRORS

     Function dwarf_get_str() can fail with:

     [DW_DLE_ARGUMENT]	One of the arguments dbg, string or len was NULL.

     [DW_DLE_ARGUMENT]	Argument offset was out of range.

     [DW_DLE_NO_ENTRY]	The debugging context dbg did not contain a ``.debug_str'' string section.

     [DW_DLE_NO_ENTRY]	Argument offset was at the very end of the ``.debug_str'' section.

EXAMPLE

     To retrieve all the strings in the DWARF string section, use:

	   Dwarf_Debug dbg;
	   Dwarf_Off offset;
	   Dwarf_Signed len;
	   Dwarf_Error de;
	   char *str;
	   int ret

	   offset = 0;
	   while ((ret = dwarf_get_str(dbg, offset, &str, &len, &de)) ==
		   DW_DLV_OK) {
		   /* .. Use the retrieved string. .. */
		   offset += len + 1; /* Account for the terminating NUL. */
	   }

	   if (ret == DW_DLV_ERROR)
		   warnx("dwarf_get_str: %s", dwarf_errmsg(de));

SEE ALSO

     dwarf(3), dwarf_init(3)

BSD
								   April 3, 2011							       BSD