安卓 - 加载库失败
2022-09-03 15:50:28
我有一个类似的问题，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上，而不是放在标准的应用程序位置。
该文件称为 libSample.so 它位于/data/library/libSample.so
我把它加载到一个静态初始化块中：
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());
}
以下是相关的 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
任何想法是什么问题？
我读了关于android可以在本机模式下从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（私有应用程序数据存储位置）。无变化：
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，操作系统正在尝试加载它......那么什么会让它失败呢？
根据其中一位评论者的建议，我尝试通过strace附加以获取更详细的错误信息。日志可以作为 github gist 找到。
错误似乎出现在第 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
这是图书馆的读数：
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
