Android - 加载库失败

Question

我对这个问题有类似的问题,但略有不同.我编译了一个.so库来与JNI一起使用.因为它很大(15 MB),所以我把它放在SDCard而不是标准的应用程序中.

该文件名为libSample.so,位于 /data/library/libSample.so

我在静态初始化块中加载它:

try {
        File sdcard = Environment.getExternalStorageDirectory();
        File libraryLoc = new File(sdcard.getAbsolutePath() + "/library/libSample.so");
        Log.i("Library", "Does the library exist?" + libraryLoc.exists());

        System.load(libraryLoc.getAbsolutePath());
    }
    catch (UnsatisfiedLinkError e) {
        Log.e("Translator", e.getMessage());
        Log.e("Translator", e.toString());
    }

这是相关的logcat输出:

09-02 16:42:58.882: DEBUG/dalvikvm(4185): Trying to load lib /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:42:58.892: DEBUG/dalvikvm(4185): Added shared lib /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:42:58.892: DEBUG/dalvikvm(4185): No JNI_OnLoad found in /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:42:58.892: INFO/Library(4185): Library exists: true
09-02 16:42:58.902: INFO/Library(4185): Library can be read: true
09-02 16:42:58.902: DEBUG/dalvikvm(4185): Trying to load lib /sdcard/library/libSample.so 0x434fb6f8
09-02 16:42:58.902: INFO/dalvikvm(4185): Unable to dlopen(/sdcard/library/libSample.so): Cannot find library
09-02 16:42:58.912: ERROR/Translator(4185): Library /sdcard/library/libSample.so not found
09-02 16:42:58.912: ERROR/Translator(4185): java.lang.UnsatisfiedLinkError: Library /sdcard/library/libSample.so not found

知道什么是错的吗？

我在本机模式下阅读了关于可以从sdcard加载dll的帖子,其中说sdcard不能用于加载库,所以我将.so移动到/data/data/com.example.hellojni/lib/libSample.so(私人app数据存储位置).没变:

09-02 16:53:18.332: DEBUG/dalvikvm(4515): Trying to load lib /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:53:18.342: DEBUG/dalvikvm(4515): Added shared lib /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:53:18.342: DEBUG/dalvikvm(4515): No JNI_OnLoad found in /data/data/com.example.hellojni/lib/libhello-jni.so 0x434fb6f8
09-02 16:53:18.352: INFO/Library(4515): Library exists: true
09-02 16:53:18.352: INFO/Library(4515): Library can be read: true
09-02 16:53:18.352: DEBUG/dalvikvm(4515): Trying to load lib /data/data/com.example.hellojni/lib/libSample.so 0x434fb6f8
09-02 16:53:18.482: INFO/dalvikvm(4515): Unable to dlopen(/data/data/com.example.hellojni/lib/libSample.so): Cannot find library
09-02 16:53:18.492: ERROR/Translator(4515): Library /data/data/com.example.hellojni/lib/libSample.so not found
09-02 16:53:18.492: ERROR/Translator(4515): java.lang.UnsatisfiedLinkError: Library /data/data/com.example.hellojni/lib/libSample.so not found

我不明白的是,显然库存在,并且操作系统正试图加载它......那么是什么会使它失败？

根据其中一个评论员的建议,我尝试通过strace附加来获取更详细的错误信息.日志可以作为github gist找到.

错误似乎在第47-51行:

mprotect(0x4235d000, 4096, PROT_READ)   = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbeb58080) = -1 ENOTTY (Not a typewriter)
write(1, "bionic/linker/linker.c:1243| ERROR:    34 unknown reloc type 3 @ 0x811a854c (2441)\n", 83) = 83
write(1, "bionic/linker/linker.c:1641| ERROR: failed to link /data/data/com.example.hellojni/lib/libSample.so\n", 100) = 100
munmap(0x81000000, 8839168)             = 0

这是图书馆的重建:

arm-eabi-readelf -d libSample.so 

Dynamic section at offset 0x80b648 contains 17 entries:
  Tag        Type                         Name/Value
 0x00000019 (INIT_ARRAY)                 0x7ff234
 0x0000001b (INIT_ARRAYSZ)               76 (bytes)
 0x00000004 (HASH)                       0xd4
 0x00000005 (STRTAB)                     0x7f41c
 0x00000006 (SYMTAB)                     0x2650c
 0x0000000a (STRSZ)                      1197287 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x00000003 (PLTGOT)                     0x80c6f0
 0x00000002 (PLTRELSZ)                   76480 (bytes)
 0x00000014 (PLTREL)                     REL
 0x00000017 (JMPREL)                     0x1ccb84
 0x00000011 (REL)                        0x1a3904
 0x00000012 (RELSZ)                      168576 (bytes)
 0x00000013 (RELENT)                     8 (bytes)
 0x00000016 (TEXTREL)                    0x0
 0x6ffffffa (RELCOUNT)                   2412
 0x00000000 (NULL)                       0x0

Answer 1

我认为更有可能的是您的 .so 所依赖的库没有被发现。但前提是 .so 文件首先可以从 SDCard 加载。