Thu Mar 30 01:38:00 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

	* elf/elf.h (STN_UNDEF): New macro (distinct from SHN_UNDEF, though
 	both are zero).

	* elf/dlfcn.h: New file.

2 files changed, 59 insertions, 2 deletions

diff --git a/elf/dlfcn.h b/elf/dlfcn.h
new file mode 100644
index 0000000000..e5d68f82be
--- /dev/null
+++ b/elf/dlfcn.h
@@ -0,0 +1,49 @@
+/* dlfcn.h -- User functions for run-time dynamic loading.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef	_DLFCN_H
+#define	_DLFCN_H 1
+
+
+/* Type of the second argument to `dlopen'.  */
+typedef enum
+  {
+    RTLD_LAZY =       1,	/* Lazy function call binding.  */
+    RTLD_NOW =        2		/* Immediate function call binding.  */
+  } dl_open_mode;
+
+/* Open the shared object FILE and map it in; return a handle that can be
+   passed to `dlsym' to get symbol values from it.  */
+extern void *dlopen (const char *__file, dl_open_mode);
+
+/* Unmap and close a shared object opened by `dlopen'.
+   The handle cannot be used again after calling `dlclose'.  */
+extern int dlclose (void *__handle);
+
+/* Find the run-time address in the shared object HANDLE refers to
+   of the symbol called NAME.  */
+extern void *dlsym (void *__handle, const char *__name);
+
+/* When any of the above functions fails, call this function
+   to return a string describing the error.  Each call resets
+   the error string so that a following call returns null.  */
+extern char *dlerror (void);
+
+
+#endif	/* dlfcn.h */
diff --git a/elf/elf.h b/elf/elf.h
index b5a3bafa62..40c0cd8aab 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -188,9 +188,9 @@ typedef struct
   Elf32_Half	st_shndx;		/* Section index */
 } Elf32_Sym;
 
-/* Special symbol index.  */
+/* Special section index.  */
 
-#define SHN_UNDEF	0		/* Undefined symbol */
+#define SHN_UNDEF	0		/* No section, undefined symbol.  */
 
 /* How to extract and insert information held in the st_info field.  */
 
@@ -216,6 +216,14 @@ typedef struct
 #define STT_LOPROC	13		/* Start of processor-specific */
 #define STT_HIPROC	15		/* End of processor-specific */
 
+
+/* Symbol table indices are found in the hash buckets and chain table
+   of a symbol hash table section.  This special index value indicates
+   the end of a chain, meaning no further symbols are found in that bucket.  */
+
+#define STN_UNDEF	0		/* End of a chain.  */
+
+
 /* Relocation table entry without addend (in section of type SHT_REL).  */
 
 typedef struct