[src/trunk]: src/libexec/ld.elf_so Implement LD_PRELOAD support.

[kleink <kleink%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c34997101b0a
branches:  trunk
changeset: 473378:c34997101b0a
user:      kleink <kleink%NetBSD.org@localhost>
date:      Mon May 31 14:48:16 1999 +0000

description:
Implement LD_PRELOAD support.

diffstat:

 libexec/ld.elf_so/load.c |  27 ++++++++++++++++++++++++++-
 libexec/ld.elf_so/rtld.c |  10 +++++++++-
 libexec/ld.elf_so/rtld.h |   3 ++-
 3 files changed, 37 insertions(+), 3 deletions(-)

diffs (79 lines):

diff -r 324b4098307a -r c34997101b0a libexec/ld.elf_so/load.c
--- a/libexec/ld.elf_so/load.c  Mon May 31 14:39:13 1999 +0000
+++ b/libexec/ld.elf_so/load.c  Mon May 31 14:48:16 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: load.c,v 1.3 1999/03/01 16:40:07 christos Exp $         */
+/*     $NetBSD: load.c,v 1.4 1999/05/31 14:48:16 kleink Exp $   */
 
 /*
  * Copyright 1996 John D. Polstra.
@@ -142,3 +142,28 @@
 
        return status;
 }
+
+#ifdef RTLD_LOADER
+int
+_rtld_preload(preload_path, dodebug)
+       const char *preload_path;
+       bool dodebug;
+{
+       const char *path;
+       char *cp, *buf;
+       int status = 0;
+
+       if (preload_path != NULL) {
+               cp = buf = xstrdup(preload_path);
+               while ((path = strsep(&cp, " ")) != NULL && status == 0) {
+                       if (_rtld_load_object(xstrdup(path), dodebug) == NULL)
+                               status = -1;
+                       else if (dodebug)
+                               dbg((" preloaded \"%s\"", path));
+               }
+               free(buf);
+       }
+
+       return (status);
+}
+#endif
diff -r 324b4098307a -r c34997101b0a libexec/ld.elf_so/rtld.c
--- a/libexec/ld.elf_so/rtld.c  Mon May 31 14:39:13 1999 +0000
+++ b/libexec/ld.elf_so/rtld.c  Mon May 31 14:48:16 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rtld.c,v 1.18 1999/04/18 19:40:06 ws Exp $      */
+/*     $NetBSD: rtld.c,v 1.19 1999/05/31 14:48:16 kleink Exp $  */
 
 /*
  * Copyright 1996 John D. Polstra.
@@ -393,6 +393,14 @@
        _rtld_objtail = &_rtld_objmain->next;
        ++_rtld_objmain->refcount;
 
+       /*
+        * Pre-load user-specified objects after the main program but before
+        * any shared object dependencies.
+        */
+       dbg(("preloading objects"));
+       if (_rtld_trust && _rtld_preload(getenv("LD_PRELOAD"), true) == -1)
+               _rtld_die();
+
        dbg(("loading needed objects"));
        if (_rtld_load_needed_objects(_rtld_objmain) == -1)
                _rtld_die();
diff -r 324b4098307a -r c34997101b0a libexec/ld.elf_so/rtld.h
--- a/libexec/ld.elf_so/rtld.h  Mon May 31 14:39:13 1999 +0000
+++ b/libexec/ld.elf_so/rtld.h  Mon May 31 14:48:16 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rtld.h,v 1.10 1999/04/18 19:40:06 ws Exp $      */
+/*     $NetBSD: rtld.h,v 1.11 1999/05/31 14:48:16 kleink Exp $  */
 
 /*
  * Copyright 1996 John D. Polstra.
@@ -203,6 +203,7 @@
 /* load.c */
 Obj_Entry *_rtld_load_object __P((char *, bool));
 int _rtld_load_needed_objects __P((Obj_Entry *));
+int _rtld_preload __P((const char *, bool));
 
 /* path.c */
 void _rtld_add_paths __P((Search_Path **, const char *, bool));