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authorUlrich Drepper <drepper@redhat.com>2000-07-20 22:53:54 +0000
committerUlrich Drepper <drepper@redhat.com>2000-07-20 22:53:54 +0000
commitbf8b3e74bfdc50935445c324f8dc03025a6f2419 (patch)
tree0f45dcac18a219c2743bd0b5e99d3e7b25f6131c
parent5e61ef88485aad8392c15956d6097285db3f2955 (diff)
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Update.
* elf/elf.h: Add various DF_1_*, DTF_1_*, and DF_P1_* entries. * elf/dl-close.c (_dl_close): Don't close an object if it is marked with nodelete. * elf/dl-open.c (dl_open_worker): Pass RTLD_NOLOAD as new parameter to _dl_map_object. Return immediately if no object loaded. Set DF_1_NODELETE bit in l_flags_1 if RTLD_NODELETE was passed. * elf/dynamic-link.h (elf_get_dynamic_info): Copy DT_FLAGS_1 entry if it exists into l_flags_1 word. * elf/dl-load.c (_dl_map_object_from_fd): Take no parameter and use it to determine whether loading is wanted or not. (_dl_map_object): Likewise. Call _dl_map_object_from_fd with new parameter. * sysdeps/generic/ldsodefs.h: Update prototype. * elf/dl-deps.c: Add new parameter to _dl_map_object calls. * elf/rtld.c: Likewise. * elf/Makefile (tests): Add noload. Add rules to generate noload. * elf/noload.c: New file. * include/link.h (struct link_map): Add l_feature_1 and l_flags_1. * sysdeps/generic/bits/dlfcn.h: Define RTLD_NOLOAD and RTLD_NODELETE. * sysdeps/mips/bits/dlfcn.h: Likewise.
-rw-r--r--ChangeLog21
-rw-r--r--bits/dlfcn.h12
-rw-r--r--elf/dl-close.c8
-rw-r--r--elf/dl-deps.c6
-rw-r--r--elf/dl-load.c11
-rw-r--r--elf/dl-open.c17
-rw-r--r--elf/dynamic-link.h2
-rw-r--r--elf/elf.h19
-rw-r--r--elf/noload.c70
-rw-r--r--elf/rtld.c10
-rw-r--r--include/link.h4
-rw-r--r--sysdeps/generic/bits/dlfcn.h12
-rw-r--r--sysdeps/generic/ldsodefs.h2
-rw-r--r--sysdeps/mips/bits/dlfcn.h12
14 files changed, 179 insertions, 27 deletions
diff --git a/ChangeLog b/ChangeLog
index ac87df4..7758f19 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,26 @@
2000-07-20 Ulrich Drepper <drepper@redhat.com>
+ * elf/elf.h: Add various DF_1_*, DTF_1_*, and DF_P1_* entries.
+ * elf/dl-close.c (_dl_close): Don't close an object if it is marked
+ with nodelete.
+ * elf/dl-open.c (dl_open_worker): Pass RTLD_NOLOAD as new parameter
+ to _dl_map_object. Return immediately if no object loaded.
+ Set DF_1_NODELETE bit in l_flags_1 if RTLD_NODELETE was passed.
+ * elf/dynamic-link.h (elf_get_dynamic_info): Copy DT_FLAGS_1 entry
+ if it exists into l_flags_1 word.
+ * elf/dl-load.c (_dl_map_object_from_fd): Take no parameter and use
+ it to determine whether loading is wanted or not.
+ (_dl_map_object): Likewise.
+ Call _dl_map_object_from_fd with new parameter.
+ * sysdeps/generic/ldsodefs.h: Update prototype.
+ * elf/dl-deps.c: Add new parameter to _dl_map_object calls.
+ * elf/rtld.c: Likewise.
+ * elf/Makefile (tests): Add noload. Add rules to generate noload.
+ * elf/noload.c: New file.
+ * include/link.h (struct link_map): Add l_feature_1 and l_flags_1.
+ * sysdeps/generic/bits/dlfcn.h: Define RTLD_NOLOAD and RTLD_NODELETE.
+ * sysdeps/mips/bits/dlfcn.h: Likewise.
+
* libio/Makefile (tests): Add tst_wprintf2.
(tst_wprintf2-ARGS): Define.
* libio/tst_wprintf2.c: New file.
diff --git a/bits/dlfcn.h b/bits/dlfcn.h
index 99d5448..0039eda 100644
--- a/bits/dlfcn.h
+++ b/bits/dlfcn.h
@@ -22,20 +22,24 @@
#endif
/* The MODE argument to `dlopen' contains one of the following: */
-#define RTLD_LAZY 0x001 /* Lazy function call binding. */
-#define RTLD_NOW 0x002 /* Immediate function call binding. */
-#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_LAZY 0x00001 /* Lazy function call binding. */
+#define RTLD_NOW 0x00002 /* Immediate function call binding. */
+#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_NOLOAD 0x00004 /* Do not load the object. */
/* If the following bit is set in the MODE argument to `dlopen',
the symbols of the loaded object and its dependencies are made
visible as if the object were linked directly into the program. */
-#define RTLD_GLOBAL 0x100
+#define RTLD_GLOBAL 0x00100
/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
The implementation does this by default and so we can define the
value to zero. */
#define RTLD_LOCAL 0
+/* Do not delete object when closed. */
+#define RTLD_NODELETE 0x01000
+
#ifdef __USE_GNU
/* To support profiling of shared objects it is a good idea to call
the function found using `dlsym' using the following macro since
diff --git a/elf/dl-close.c b/elf/dl-close.c
index ec563ed..99d52d0 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -48,6 +48,11 @@ _dl_close (void *_map)
unsigned int nrellist;
unsigned int i;
+ /* First see whether we can remove the object at all. */
+ if (map->l_flags_1 & DF_1_NODELETE)
+ /* Nope. Do nothing. */
+ return;
+
if (map->l_opencount == 0)
_dl_signal_error (0, map->l_name, N_("shared object not open"));
@@ -112,7 +117,8 @@ _dl_close (void *_map)
points to, the 0th elt being MAP itself. Decrement the reference
counts on all the objects MAP depends on. */
for (i = 0; i < nsearchlist; ++i)
- --list[i]->l_opencount;
+ if (! (list[i]->l_flags_1 & DF_1_NODELETE))
+ --list[i]->l_opencount;
/* Check each element of the search list to see if all references to
it are gone. */
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index 1d3779f..5bc048e 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -67,7 +67,7 @@ openaux (void *a)
args->aux = _dl_map_object (args->map, args->name, 0,
(args->map->l_type == lt_executable
? lt_library : args->map->l_type),
- args->trace_mode);
+ args->trace_mode, 0);
}
@@ -232,7 +232,7 @@ _dl_map_object_deps (struct link_map *map,
dep = _dl_map_object (l, name, 0,
l->l_type == lt_executable ? lt_library :
- l->l_type, trace_mode);
+ l->l_type, trace_mode, 0);
/* Add it in any case to the duplicate list. */
newp = alloca (sizeof (struct list));
@@ -316,7 +316,7 @@ _dl_map_object_deps (struct link_map *map,
args.aux = _dl_map_object (l, name, 0,
(l->l_type == lt_executable
? lt_library : l->l_type),
- trace_mode);
+ trace_mode, 0);
}
/* The auxiliary object is actually available.
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 2c506b5..fbf82e2 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -688,7 +688,7 @@ static
#endif
struct link_map *
_dl_map_object_from_fd (const char *name, int fd, char *realname,
- struct link_map *loader, int l_type)
+ struct link_map *loader, int l_type, int noload)
{
/* This is the expected ELF header. */
#define ELF32_CLASS ELFCLASS32
@@ -752,6 +752,11 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
return l;
}
+ if (noload)
+ /* We are not supposed to load the object unless it is already
+ loaded. So return now. */
+ return NULL;
+
/* Print debugging message. */
if (__builtin_expect (_dl_debug_files, 0))
_dl_debug_message (1, "file=", name, "; generating link map\n", NULL);
@@ -1301,7 +1306,7 @@ open_path (const char *name, size_t namelen, int preloaded,
struct link_map *
internal_function
_dl_map_object (struct link_map *loader, const char *name, int preloaded,
- int type, int trace_mode)
+ int type, int trace_mode, int noload)
{
int fd;
char *realname;
@@ -1501,5 +1506,5 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded,
_dl_signal_error (errno, name, N_("cannot open shared object file"));
}
- return _dl_map_object_from_fd (name, fd, realname, loader, type);
+ return _dl_map_object_from_fd (name, fd, realname, loader, type, noload);
}
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 680377b..477ecdf 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -144,7 +144,17 @@ dl_open_worker (void *a)
}
/* Load the named object. */
- args->map = new = _dl_map_object (NULL, file, 0, lt_loaded, 0);
+ args->map = new = _dl_map_object (NULL, file, 0, lt_loaded, 0,
+ mode & RTLD_NOLOAD);
+
+ /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is
+ set and the object is not already loaded. */
+ if (new == NULL)
+ {
+ assert (mode & RTLD_NOLOAD);
+ return;
+ }
+
if (new->l_searchlist.r_list)
/* It was already open. */
return;
@@ -279,6 +289,11 @@ dl_open_worker (void *a)
/* XXX Do we have to add something to r_dupsearchlist??? --drepper */
}
+ /* Mark the object as not deletable if the RTLD_NODELETE flags was
+ passed. */
+ if (__builtin_expect (mode & RTLD_NODELETE, 0))
+ new->l_flags_1 |= DF_1_NODELETE;
+
if (_dl_sysdep_start == NULL)
/* We must be the static _dl_open in libc.a. A static program that
has loaded a dynamic object now has competition. */
diff --git a/elf/dynamic-link.h b/elf/dynamic-link.h
index 79e17ed..c6fa3e1 100644
--- a/elf/dynamic-link.h
+++ b/elf/dynamic-link.h
@@ -114,6 +114,8 @@ elf_get_dynamic_info (struct link_map *l)
if (flags & DF_BIND_NOW)
info[DT_BIND_NOW] = info[DT_FLAGS];
}
+ if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
+ l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
if (info[DT_RUNPATH] != NULL)
/* If both RUNPATH and RPATH are given, the latter is ignored. */
info[DT_RPATH] = NULL;
diff --git a/elf/elf.h b/elf/elf.h
index 2005bdc..ce04184 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -622,7 +622,7 @@ typedef struct
#define DT_PLTPADSZ 0x6ffffdf9
#define DT_MOVEENT 0x6ffffdfa
#define DT_MOVESZ 0x6ffffdfb
-#define DT_FEATURE_1 0x6ffffdfc
+#define DT_FEATURE_1 0x6ffffdfc /* Feature selection (DTF_*). */
#define DT_POSFLAG_1 0x6ffffdfd /* Flags for DT_* entries, effecting
the following DT_* entry. */
#define DT_SYMINSZ 0x6ffffdfe /* Size of syminfo table (in bytes) */
@@ -678,6 +678,23 @@ typedef struct
#define DF_1_LOADFLTR 0x00000010 /* Trigger filtee loading at runtime.*/
#define DF_1_INITFIRST 0x00000020 /* Set RTLD_INITFIRST for this object*/
#define DF_1_NOOPEN 0x00000040 /* Set RTLD_NOOPEN for this object. */
+#define DF_1_ORIGIN 0x00000080 /* $ORIGIN must be handled. */
+#define DF_1_DIRECT 0x00000100 /* Direct binding enabled. */
+#define DF_1_TRANS 0x00000200
+#define DF_1_INTERPOSE 0x00000400 /* Object is used to interpose. */
+#define DF_1_NODEFLIB 0x00000800 /* Ignore default lib search path. */
+#define DF_1_NODUMP 0x00001000
+#define DF_1_CONFALT 0x00002000
+#define DF_1_ENDFILTEE 0x00004000
+
+/* Flags for the feature selection in DT_FEATURE_1. */
+#define DTF_1_PARINIT 0x00000001
+#define DTF_1_CONFEXP 0x00000002
+
+/* Flags in the DT_POSFLAG_1 entry effecting only the next DT_* entry. */
+#define DF_P1_LAZYLOAD 0x00000001 /* Lazyload following object. */
+#define DF_P1_GROUPPERM 0x00000002 /* Symbols from next object are not
+ generally available. */
/* Version definition sections. */
diff --git a/elf/noload.c b/elf/noload.c
new file mode 100644
index 0000000..826427f
--- /dev/null
+++ b/elf/noload.c
@@ -0,0 +1,70 @@
+#include <dlfcn.h>
+#include <stdio.h>
+
+int
+main (void)
+{
+ int result = 0;
+
+ /* First try to load an object which is a dependency. This should
+ succeed. */
+ if (dlopen ("testobj1.so", RTLD_LAZY | RTLD_NOLOAD) == NULL)
+ {
+ printf ("cannot open \"testobj1.so\": %s\n", dlerror ());
+ result = 1;
+ }
+ else
+ puts ("loading \"testobj1.so\" succeeded, OK");
+
+ /* Now try loading an object which is not already loaded. */
+ if (dlopen ("testobj5.so", RTLD_LAZY | RTLD_NOLOAD) != NULL)
+ {
+ puts ("succeeded in loading \"testobj5.so\"");
+ result = 1;
+ }
+ else
+ {
+ /* Load the object and run the same test again. */
+ void *p;
+
+ puts ("\"testobj5.so\" wasn't loaded and RTLD_NOLOAD prevented it, OK");
+
+ p = dlopen ("testobj5.so", RTLD_LAZY);
+
+ if (p == NULL)
+ {
+ printf ("cannot open \"testobj5.so\" without RTLD_NOLOAD: %s\n",
+ dlerror ());
+ result = 1;
+ }
+ else
+ {
+ puts ("loading \"testobj5.so\" succeeded, OK");
+
+ if (dlopen ("testobj5.so", RTLD_LAZY | RTLD_NOLOAD) == NULL)
+ {
+ printf ("cannot open \"testobj5.so\": %s\n", dlerror ());
+ result = 1;
+ }
+ else
+ puts ("loading \"testobj5.so\" with RTLD_NOLOAD succeeded, OK");
+
+ if (dlclose (p) != 0)
+ {
+ printf ("cannot close \"testobj5.so\": %s\n", dlerror ());
+ result = 1;
+ }
+ else
+ puts ("closing \"testobj5.so\" succeeded, OK");
+ }
+ }
+
+ return result;
+}
+
+
+int
+foo (int a)
+{
+ return 42 + a;
+}
diff --git a/elf/rtld.c b/elf/rtld.c
index 1db9699..8276b79 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -313,7 +313,7 @@ static void
map_doit (void *a)
{
struct map_args *args = (struct map_args *) a;
- args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0);
+ args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0, 0);
}
static void
@@ -514,7 +514,7 @@ of this helper program; chances are you did not intend to run this program.\n\
else
{
HP_TIMING_NOW (start);
- _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0);
+ _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0, 0);
HP_TIMING_NOW (stop);
HP_TIMING_DIFF (load_time, start, stop);
@@ -694,7 +694,7 @@ of this helper program; chances are you did not intend to run this program.\n\
|| strchr (p, '/') == NULL))
{
struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1,
- lt_library, 0);
+ lt_library, 0, 0);
if (new_map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
@@ -762,7 +762,7 @@ of this helper program; chances are you did not intend to run this program.\n\
if (p[0] != '\0')
{
struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1,
- lt_library, 0);
+ lt_library, 0, 0);
if (new_map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
@@ -773,7 +773,7 @@ of this helper program; chances are you did not intend to run this program.\n\
{
char *p = strndupa (problem, file_size - (problem - file));
struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1,
- lt_library, 0);
+ lt_library, 0, 0);
if (new_map->l_opencount == 1)
/* It is no duplicate. */
++npreloads;
diff --git a/include/link.h b/include/link.h
index 38652ca..375d5d1 100644
--- a/include/link.h
+++ b/include/link.h
@@ -214,6 +214,10 @@ struct link_map
unsigned int l_reldepsmax;
unsigned int l_reldepsact;
struct link_map **l_reldeps;
+
+ /* Various flag words. */
+ ElfW(Word) l_feature_1;
+ ElfW(Word) l_flags_1;
};
#endif /* link.h */
diff --git a/sysdeps/generic/bits/dlfcn.h b/sysdeps/generic/bits/dlfcn.h
index 99d5448..0039eda 100644
--- a/sysdeps/generic/bits/dlfcn.h
+++ b/sysdeps/generic/bits/dlfcn.h
@@ -22,20 +22,24 @@
#endif
/* The MODE argument to `dlopen' contains one of the following: */
-#define RTLD_LAZY 0x001 /* Lazy function call binding. */
-#define RTLD_NOW 0x002 /* Immediate function call binding. */
-#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_LAZY 0x00001 /* Lazy function call binding. */
+#define RTLD_NOW 0x00002 /* Immediate function call binding. */
+#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_NOLOAD 0x00004 /* Do not load the object. */
/* If the following bit is set in the MODE argument to `dlopen',
the symbols of the loaded object and its dependencies are made
visible as if the object were linked directly into the program. */
-#define RTLD_GLOBAL 0x100
+#define RTLD_GLOBAL 0x00100
/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
The implementation does this by default and so we can define the
value to zero. */
#define RTLD_LOCAL 0
+/* Do not delete object when closed. */
+#define RTLD_NODELETE 0x01000
+
#ifdef __USE_GNU
/* To support profiling of shared objects it is a good idea to call
the function found using `dlsym' using the following macro since
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index fc9a9d1..a850107 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -271,7 +271,7 @@ extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
value to allow additional security checks. */
extern struct link_map *_dl_map_object (struct link_map *loader,
const char *name, int preloaded,
- int type, int trace_mode)
+ int type, int trace_mode, int noload)
internal_function;
/* Call _dl_map_object on the dependencies of MAP, and set up
diff --git a/sysdeps/mips/bits/dlfcn.h b/sysdeps/mips/bits/dlfcn.h
index 0da3a67..006eeb6 100644
--- a/sysdeps/mips/bits/dlfcn.h
+++ b/sysdeps/mips/bits/dlfcn.h
@@ -22,20 +22,24 @@
#endif
/* The MODE argument to `dlopen' contains one of the following: */
-#define RTLD_LAZY 0x001 /* Lazy function call binding. */
-#define RTLD_NOW 0x002 /* Immediate function call binding. */
-#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_LAZY 0x0001 /* Lazy function call binding. */
+#define RTLD_NOW 0x0002 /* Immediate function call binding. */
+#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
+#define RTLD_NOLOAD 0x00008 /* Do not load the object. */
/* If the following bit is set in the MODE argument to `dlopen',
the symbols of the loaded object and its dependencies are made
visible as if the object were linked directly into the program. */
-#define RTLD_GLOBAL 0x004
+#define RTLD_GLOBAL 0x0004
/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
The implementation does this by default and so we can define the
value to zero. */
#define RTLD_LOCAL 0
+/* Do not delete object when closed. */
+#define RTLD_NODELETE 0x01000
+
#ifdef __USE_GNU
/* To support profiling of shared objects it is a good idea to call
the function found using `dlsym' using the following macro since