ldopen, ldaopen - open a COFF file for reading
LDFILE *ldopen (filename, ldptr)
LDFILE *ldaopen (filename, oldptr)
Available only on Sun 386i systems running a SunOS 4.0.x release or
earlier. Not a SunOS 4.1 release feature.
ldopen() and ldclose(3X) are designed to provide uniform access to both
simple object files and object files that are members of archive files.
Thus an archive of COFF files can be processed as if it were a series
of simple COFF files.
If ldptr has the value NULL, then ldopen() will open filename and allo-
cate and initialize the LDFILE structure, and return a pointer to the
structure to the calling program.
If ldptr is valid and if TYPE(ldptr) is the archive magic number,
ldopen() will reinitialize the LDFILE structure for the next archive
member of filename.
ldopen() and ldclose(3X) are designed to work in concert. ldclose will
return FAILURE only when TYPE(ldptr) is the archive magic number and
there is another file in the archive to be processed. Only then should
ldopen() be called with the current value of ldptr. In all other
cases, in particular whenever a new filename is opened, ldopen() should
be called with a NULL ldptr argument.
The following is a prototype for the use of ldopen() and ldclose(3X).
/* for each filename to be processed */
ldptr = NULL;
if ( (ldptr = ldopen(filename, ldptr)) != NULL )
/* check magic number */
/* process the file */
} while (ldclose(ldptr) == FAILURE );
If the value of oldptr is not NULL, ldaopen() will open filename anew
and allocate and initialize a new LDFILE structure, copying the TYPE,
OFFSET, and HEADER" fields from oldptr. ldaopen() returns a pointer to
the new LDFILE structure. This new pointer is independent of the old
pointer, oldptr. The two pointers may be used concurrently to read
separate parts of the object file. For example, one pointer may be
used to step sequentially through the relocation information, while the
other is used to read indexed symbol table entries.
Both ldopen() and ldaopen() open filename for reading. Both functions
return NULL if filename cannot be opened, or if memory for the LDFILE
structure cannot be allocated. A successful open does not insure that
the given file is a COFF file or an archived object file.
The program must be loaded with the object file access routine library
fopen(3V), ldclose(3X), ldfcn(3)
19 February 1988 LDOPEN(3X)