Thu Oct 5 00:59:58 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

* elf/rtld.c (dl_main): Grok --list flag.
	* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_start): Ignore -- args.

	* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_message): New function.
	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_message): New function.
	* elf/link.h (_dl_sysdep_message): Declare it.

ChangeLog

@@ -1,5 +1,14 @@
+Thu Oct  5 00:59:58 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
+
+	* elf/rtld.c (dl_main): Grok --list flag.
+	* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_start): Ignore -- args.
+
 Wed Oct  4 00:21:03 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
 
+	* sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_message): New function.
+	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_message): New function.
+	* elf/link.h (_dl_sysdep_message): Declare it.
+
 	* sysdeps/unix/Makefile ($(common-objpfx)ioctls): Remove NULL from
 	the list.
 

elf/link.h

@@ -120,6 +120,11 @@ extern int _dl_zerofd;
 /* OS-dependent function to open the zero-fill device.  */
 extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
 
+/* OS-dependent function to write a message on the standard output.
+   All arguments are `const char *'; args until a null pointer
+   are concatenated to form the message to print.  */
+extern void _dl_sysdep_message (const char *string, ...);
+
 /* OS-dependent function to give a fatal error message and exit
    when the dynamic linker fails before the program is fully linked.
    All arguments are `const char *'; args until a null pointer

elf/rtld.c

@@ -22,6 +22,7 @@ Cambridge, MA 02139, USA.  */
 #include <stddef.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include "../stdio/_itoa.h"
 
 
 #ifdef RTLD_START
@@ -113,6 +114,7 @@ dl_main (const Elf32_Phdr *phdr,
       struct link_map *l;
       const char *interpreter_name;
       int lazy;
+      int list_only = 0;
 
       if (*user_entry == (Elf32_Addr) &_start)
 	{
@@ -133,7 +135,7 @@ dl_main (const Elf32_Phdr *phdr,
 	     installing it.  */
 	  if (_dl_argc < 2)
 	    _dl_sysdep_fatal ("\
-Usage: ld.so EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
+Usage: ld.so [--list] EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
 You have invoked `ld.so', the helper program for shared library executables.\n\
 This program usually lives in the file `/lib/ld.so', and special directives\n\
 in executable files using ELF shared libraries tell the system's program\n\
@@ -147,10 +149,21 @@ file you run.  This is mostly of use for maintainers to test new versions\n\
 of this helper program; chances are you did not intend to run this program.\n",
 			      NULL);
 
-	  ++_dl_skip_args;
 	  interpreter_name = _dl_argv[0];
+
+	  if (! strcmp (_dl_argv[1], "--list"))
+	    {
+	      list_only = 1;
+
+	      ++_dl_skip_args;
 	      --_dl_argc;
 	      ++_dl_argv;
+	    }
+
+	  ++_dl_skip_args;
+	  --_dl_argc;
+	  ++_dl_argv;
+
 	  l = _dl_map_object (NULL, _dl_argv[0]);
 	  phdr = l->l_phdr;
 	  phent = l->l_phnum;
@@ -265,6 +278,22 @@ of this helper program; chances are you did not intend to run this program.\n",
       dl_r_debug.r_version = 1	/* R_DEBUG_VERSION XXX */;
       dl_r_debug.r_map = _dl_loaded;
       dl_r_debug.r_brk = (Elf32_Addr) &_dl_r_debug_state;
+
+      if (list_only)
+	{
+	  for (l = _dl_loaded->l_next; l; l = l->l_next)
+	    {
+	      char buf[20], *bp;
+	      buf[sizeof buf - 1] = '\0';
+	      bp = _itoa (l->l_addr, &buf[sizeof buf - 1], 16, 0);
+	      while (&buf[sizeof buf - 1] - bp < sizeof l->l_addr * 2)
+		*--bp = '0';
+	      _dl_sysdep_message ("\t", l->l_libname, " => ", l->l_name,
+				  " (0x", bp, ")\n", NULL);
+	    }
+
+	  _exit (0);
+	}
     }
   const char *errstring;
   const char *errobj;

sysdeps/generic/dl-sysdep.c

@@ -104,3 +104,19 @@ _dl_sysdep_fatal (const char *msg, ...)
 
   _exit (127);
 }
+
+
+void
+_dl_sysdep_message (const char *msg, ...)
+{
+  va_list ap;
+
+  va_start (ap, msg);
+  do
+    {
+      size_t len = strlen (msg);
+      write (STDOUT_FILENO, msg, len);
+      msg = va_arg (ap, const char *);
+    } while (msg);
+  va_end (ap);
+}

sysdeps/mach/hurd/dl-sysdep.c

@@ -116,7 +116,7 @@ unfmh();			/* XXX */
 	   for example "-/lib/libc.so=123" says that the contents of
 	   /lib/libc.so are found in a memory object whose port name
 	   in our task is 123.  */
-	while (_dl_argc > 2 && _dl_argv[1][0] == '-')
+	while (_dl_argc > 2 && _dl_argv[1][0] == '-' && _dl_argv[1][1] != '-')
 	  {
 	    char *lastslash, *memobjname, *p;
 	    struct link_map *l;
@@ -227,6 +227,28 @@ _dl_sysdep_fatal (const char *msg, ...)
 }
 
 
+void
+_dl_sysdep_message (const char *msg, ...)
+{
+  va_list ap;
+
+  va_start (ap, msg);
+  do
+    {
+      size_t len = strlen (msg);
+      mach_msg_type_number_t nwrote;
+      do
+	{
+	  if (__io_write (_hurd_init_dtable[1], msg, len, -1, &nwrote))
+	    break;
+	  len -= nwrote;
+	  msg += nwrote;
+	} while (nwrote > 0);
+      msg = va_arg (ap, const char *);
+    } while (msg);
+  va_end (ap);
+}
+
 /* Minimal open/close/mmap implementation sufficient for initial loading of
    shared libraries.  These are weak definitions so that when the
    dynamic linker re-relocates itself to be user-visible (for -ldl),