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authorRoland McGrath <roland@gnu.org>1995-03-30 10:00:08 +0000
committerRoland McGrath <roland@gnu.org>1995-03-30 10:00:08 +0000
commitb1f11361752e71ad3bf6445bc2ba516958fa17ad (patch)
treeeaa84bb02a00fd5f55f52d73cb6b89aa7d8fe278 /elf
parentea7d9938624a6db1974028f712e1bacbdc316ee8 (diff)
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.
Diffstat (limited to 'elf')
-rw-r--r--elf/dlfcn.h49
-rw-r--r--elf/elf.h12
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