I have a similar problem to this question, but slightly different. I have compiled a .so library to use with JNI. Because it is large (15 MB), I am putting it on the SDCard instead of in the standard application place.
The file is called libSample.so and it's located at /data/library/libSample.so
I load it in a static initialization block:
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());
}
Here's the relevant logcat output:
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
Any idea what's wrong?
I read the post about can android load dll's from sdcard in native mode which said that the sdcard cannot be used to load libraries, so I moved the .so into /data/data/com.example.hellojni/lib/libSample.so (the private app data storage location). No change:
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
What I don't understand is that clearly the library exists, and the OS is trying to load it ... so what would make it fail?
Following the advice of one of the commentors, I tried attaching via strace to get more detailed error information. The log can be found as a github gist.
The error appears to be on lines 47-51:
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
Here's the readelf of the library:
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
I think it may be more likely that a library that your .so depends upon is not being found. But that is only if .so files can be loaded from an SDCard in the first place.