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Fix libdl build warnings, turn on -Werror.

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Change-Id: I71c39b77ac1e9a92482ce71a829449100945ec86
This commit is contained in:
Elliott Hughes 2014-01-14 17:25:13 -08:00
parent d971f72905
commit 7ac975146e
4 changed files with 15 additions and 212 deletions
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23
libdl/Android.mk
View file

@ -23,8 +23,9 @@ LOCAL_LDFLAGS += -Wl,--exclude-libs=libgcc_eh.a
endif
LOCAL_SRC_FILES:= libdl.c
LOCAL_CFLAGS := -Wall -Wextra -Werror
LOCAL_MODULE:= libdl
LOCAL_MODULE := libdl
LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
# NOTE: libdl needs __aeabi_unwind_cpp_pr0 from libgcc.a but libgcc.a needs a
@ -36,23 +37,3 @@ LOCAL_ALLOW_UNDEFINED_SYMBOLS := true
LOCAL_SYSTEM_SHARED_LIBRARIES :=
include $(BUILD_SHARED_LIBRARY)
BUILD_DLTEST:=0
ifeq ($(BUILD_DLTEST),1)
#
# dltest
#
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= dltest.c
LOCAL_MODULE:= dltest
LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
LOCAL_SHARED_LIBRARIES := libdl
include $(BUILD_EXECUTABLE)
endif

28
libdl/NOTICE
View file

@ -14,31 +14,3 @@ limitations under the License.
-------------------------------------------------------------------
Copyright (C) 2008 The Android Open Source Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
-------------------------------------------------------------------

147
libdl/dltest.c
View file

@ -1,147 +0,0 @@
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <dlfcn.h>
extern char *optarg;
extern int optind, opterr, optopt;
static struct option long_options[] = {
{"library", required_argument, 0, 'l'},
{"symbol", required_argument, 0, 's'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0},
};
/* This array must parallel long_options[] */
static const char *descriptions[] = {
"specify a library path to look up symbol",
"specify symbol to look up",
"print this help screen",
};
void print_help(const char *name) {
fprintf(stdout,
"invokation:\n"
"\t%s [-l <libname>] -s <symbol name>\n"
"\t%s -h\n\n", name, name);
fprintf(stdout, "options:\n");
struct option *opt = long_options;
const char **desc = descriptions;
while (opt->name) {
fprintf(stdout, "\t-%c/--%s%s: %s\n",
opt->val,
opt->name,
(opt->has_arg ? " (argument)" : ""),
*desc);
opt++;
desc++;
}
}
int get_options(int argc, char **argv, char **lib, char **sym)
{
int c;
*lib = 0;
*sym = 0;
while (1) {
/* getopt_long stores the option index here. */
int option_index = 0;
c = getopt_long (argc, argv,
"l:s:h",
long_options,
&option_index);
/* Detect the end of the options. */
if (c == -1) break;
switch (c) {
case 'l':
*lib = strdup(optarg);
break;
case 's':
*sym = strdup(optarg);
break;
case 'h': print_help(argv[0]); exit(EXIT_FAILURE); break;
case '?':
/* getopt_long already printed an error message. */
break;
default:
fprintf(stderr, "Unknown option");
exit(EXIT_FAILURE);
}
}
return optind;
}
int main(int argc, char **argv)
{
char *libname, *symname, *prog = *argv;
get_options(argc, argv, &libname, &symname);
if (symname == NULL) {
fprintf(stderr, "You must specify a symbol!\n");
print_help(prog);
exit(EXIT_FAILURE);
}
{
const char *dlerr;
void *handle, *symbol;
printf("opening library [%s]\n", libname);
dlerr = dlerror();
handle = libname ? dlopen(libname, RTLD_NOW) : RTLD_DEFAULT;
dlerr = dlerror();
if (dlerr != NULL) fprintf(stderr, "dlopen() error: %s\n", dlerr);
printf("opening symbol [%s]\n", symname);
symbol = dlsym(handle, symname);
dlerr = dlerror();
if (dlerr != NULL) fprintf(stderr, "dlsym() error: %s\n", dlerr);
printf("closing library [%s]\n", libname);
dlclose(handle);
dlerr = dlerror();
if (dlerr != NULL) fprintf(stderr, "dlclose() error: %s\n", dlerr);
else printf("successfully opened symbol\n");
}
if (libname != NULL) free(libname);
if (symname != NULL) free(symname);
return 0;
}

29
libdl/libdl.c
View file

@ -15,26 +15,23 @@
*/
#include <dlfcn.h>
#include <link.h>
#include <stdlib.h>
/* These are stubs for functions that are actually defined
* in the dynamic linker (dlfcn.c), and hijacked at runtime.
*/
void *dlopen(const char *filename, int flag) { return 0; }
const char *dlerror(void) { return 0; }
void *dlsym(void *handle, const char *symbol) { return 0; }
int dladdr(const void *addr, Dl_info *info) { return 0; }
int dlclose(void *handle) { return 0; }
// These are stubs for functions that are actually defined
// in the dynamic linker and hijacked at runtime.
void android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { }
void android_update_LD_LIBRARY_PATH(const char* ld_library_path) { }
void* dlopen(const char* filename __unused, int flag __unused) { return 0; }
const char* dlerror(void) { return 0; }
void* dlsym(void* handle __unused, const char* symbol __unused) { return 0; }
int dladdr(const void* addr __unused, Dl_info* info __unused) { return 0; }
int dlclose(void* handle __unused) { return 0; }
void android_get_LD_LIBRARY_PATH(char* buffer __unused, size_t buffer_size __unused) { }
void android_update_LD_LIBRARY_PATH(const char* ld_library_path __unused) { }
#if defined(__arm__)
void *dl_unwind_find_exidx(void *pc, int *pcount) { return 0; }
_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc __unused, int* pcount __unused) { return 0; }
#endif
/* we munge the cb definition so we don't have to include any headers here.
* It won't affect anything since these are just symbols anyway */
int dl_iterate_phdr(int (*cb)(void *info, void *size, void *data), void *data) { return 0; }
int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data) __unused, void* data __unused) { return 0; }