Discussion between Aniket and Janka

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5:58 AM

@Janka Output is

ERROR: ld.so: object './libCP5200.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
linux-gate.so.1 => (0xf7fa4000)
./libCP5200.so (0xf7f82000)
libCP5200.so => not found
libstdc++.so.6 => /usr/lib32/libstdc++.so.6 (0xf7dee000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf7dd1000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7c1a000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf7bc5000)
/lib/ld-linux.so.2 (0xf7fa6000)

1 hour later…

Janka

7:17 AM

You are testing this on the x86 machine.

You have to ldd on the Raspberry.

Aniket

Yes, same output on raspberry pi

connected it via VNC so

@janka here's my libray architecture

file libCP5200.so

libCP5200.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, not stripped

Output of LD_PRELOAD=./libCP5200.so ldd ./test in raspberry is

ERROR: ld.so: object './libCP5200.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
ERROR: ld.so: object './libCP5200.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
linux-vdso.so.1 (0x7e944000)
/usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76fbe000)
libCP5200.so => not found
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x76ecc000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x76e51000)
libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x76e24000)

Janka

7:37 AM

Here you have another problem, ./libCP5200 isn't in the current directory when you call ldd ./test.

Aniket

@janka no, it is in the present directory. Really stuck bad in this :(

Janka

Then try with an absolute path, please.

Aniket

Same output :

LD_PRELOAD=/home/pi/Downloads/linux-sdk-demo-arm ldd ./test

ERROR: ld.so: object '/home/pi/Downloads/linux-sdk-demo-arm' from LD_PRELOAD cannot be preloaded (cannot read file data): ignored.
ERROR: ld.so: object '/home/pi/Downloads/linux-sdk-demo-arm' from LD_PRELOAD cannot be preloaded (cannot read file data): ignored.
linux-vdso.so.1 (0x7ee69000)
/usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f07000)
libCP5200.so => not found
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x76e15000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x76d9a000)

Janka

No, this is a very different error.

"cannot read file data"

Because this is a directory, not the absolute path to your libCP5200.so

Aniket

so i need to change anything in command ?

or it is architecture problem in .so file ?

Janka

7:42 AM

LD_PRELOAD=/path/to/my/libCP5200.so ldd ./test

Aniket

ERROR: ld.so: object '/home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
ERROR: ld.so: object '/home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
linux-vdso.so.1 (0x7efa5000)
/usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f1c000)
libCP5200.so => not found
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x76e2a000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x76daf000)

Janka

Now it's "cannot open shared object file"

You have to check if that file really is at that location, and the correct one.

file /home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so

Aniket

Yes, it is in this path

pi@raspberrypi:~/Downloads/linux-sdk-demo-arm $ file /home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so
/home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, not stripped

Janka

Is it executable?

Aniket

yes, tried with all permissions

currenty its having 777 ( -rwxrwxrwx )

Janka

7:48 AM

ldd /home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so

Aniket

pi@raspberrypi:~/Downloads/linux-sdk-demo-arm $ ldd /home/pi/Downloads/linux-sdk-demo-arm/libCP5200.so
not a dynamic executable

Janka

AAAAAAhhhhhh