argv0 option for glibc dynamic linker

glibc-2.17-elf-rtld-argv0.patch

--- eglibc-2.17.orig/elf/rtld.c	2012-10-10 17:35:46.000000000 +0200
+++ eglibc-2.17/elf/rtld.c	2013-11-05 17:08:42.066912334 +0100
@@ -932,6 +932,7 @@
 
   if (*user_entry == (ElfW(Addr)) ENTRY_POINT)
     {
+      char *forced_argv0 = NULL;
       /* Ho ho.  We are not the program interpreter!  We are the program
 	 itself!  This means someone ran ld.so as a command.  Well, that
 	 might be convenient to do sometimes.  We support it by
@@ -1003,6 +1004,14 @@
 	    _dl_argc -= 2;
 	    INTUSE(_dl_argv) += 2;
 	  }
+	else if (! strcmp (INTUSE(_dl_argv)[1], "--argv0") && _dl_argc > 2)
+	  {
+	    forced_argv0 = INTUSE(_dl_argv)[2];
+
+	    _dl_skip_args += 2;
+	    _dl_argc -= 2;
+	    INTUSE(_dl_argv) += 2;
+	  }
 	else
 	  break;
 
@@ -1031,7 +1040,9 @@
 			variable LD_LIBRARY_PATH\n\
   --inhibit-rpath LIST  ignore RUNPATH and RPATH information in object names\n\
 			in LIST\n\
-  --audit LIST          use objects named in LIST as auditors\n");
+  --audit LIST          use objects named in LIST as auditors\n\
+                        in LIST\n\
+  --argv0 STRING        use STRING as argv[0]\n");
 
       ++_dl_skip_args;
       --_dl_argc;
@@ -1083,6 +1094,8 @@
 	  HP_TIMING_DIFF (load_time, start, stop);
 	}
 
+      if (forced_argv0 != NULL) _dl_argv[0] = forced_argv0;
+
       /* Now the map for the main executable is available.  */
       main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
 

glibc-2.5-elf-rtld.c.patch

--- /home/lauri/workarea/diablo_x86/OLD-1-lta27/pkgs_slow2/glibc-2.5.0/build-tree/glibc-2.5/elf/rtld.c	2006-09-29 19:56:15.000000000 +0300
+++ rtld.c	2008-09-24 16:08:00.000000000 +0300
@@ -894,6 +894,7 @@

   if (*user_entry == (ElfW(Addr)) ENTRY_POINT)
     {
+      const char *forced_argv0 = NULL;
       /* Ho ho.  We are not the program interpreter!  We are the program
	 itself!  This means someone ran ld.so as a command.  Well, that
	 might be convenient to do sometimes.  We support it by
@@ -958,6 +959,14 @@
	    _dl_argc -= 2;
	    INTUSE(_dl_argv) += 2;
	  }
+	else if (! strcmp (INTUSE(_dl_argv)[1], "--argv0") && _dl_argc > 2)
+	  {
+	    forced_argv0 = INTUSE(_dl_argv)[2];
+
+	    _dl_skip_args += 2;
+	    _dl_argc -= 2;
+	    INTUSE(_dl_argv) += 2;
+	  }
	else
	  break;

@@ -984,7 +993,8 @@
   --library-path PATH   use given PATH instead of content of the environment\n\
                         variable LD_LIBRARY_PATH\n\
   --inhibit-rpath LIST  ignore RUNPATH and RPATH information in object names\n\
-                        in LIST\n");
+                        in LIST\n\
+  --argv0 STRING        use STRING as argv[0]\n");

       ++_dl_skip_args;
       --_dl_argc;
@@ -1037,6 +1047,8 @@
	  HP_TIMING_DIFF (load_time, start, stop);
	}

+      if (forced_argv0 != NULL) _dl_argv[0] = forced_argv0;
+
       /* Now the map for the main executable is available.  */
       main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;