couragecc
commented
5 years ago Code as follows
//main.go package main
import "C"
//export add
func add(left, right int) int {
return left + right
}
//export minus
func minus(left, right int) int {
return left - right
}
//export multiply
func multiply(left, right int) int {
return left * right
}
//export divide
func divide(left, right int) int {
return left / right
}
//export testPrint
func testPrint(){
print("test")
}
func main() {
}
// test.py
import ctypes
lib = ctypes.cdll.LoadLibrary('./cc.so')
if lib is not None:
print ("can load so")
/usr/src/app # go build -o cc.so -buildmode=c-shared main.go
/usr/src/app # readelf -d cc.so Dynamic section at offset 0x10cd10 contains 22 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libc.musl-x86_64.so.1] 0x0000000000000010 (SYMBOLIC) 0x0 0x000000000000000c (INIT) 0x42000 0x000000000000000d (FINI) 0x92ed9 0x0000000000000019 (INIT_ARRAY) 0xa2078 0x000000000000001b (INIT_ARRAYSZ) 8 (bytes) 0x000000006ffffef5 (GNU_HASH) 0x270 0x0000000000000005 (STRTAB) 0xa50 0x0000000000000006 (SYMTAB) 0x378 0x000000000000000a (STRSZ) 1026 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000003 (PLTGOT) 0x10deb0 0x0000000000000002 (PLTRELSZ) 720 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x41a00 0x0000000000000007 (RELA) 0xe58 0x0000000000000008 (RELASZ) 265128 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000000000001e (FLAGS) SYMBOLIC BIND_NOW STATIC_TLS 0x000000006ffffffb (FLAGS_1) Flags: NOW NODELETE 0x000000006ffffff9 (RELACOUNT) 11040 0x0000000000000000 (NULL) 0x0
/usr/src/app # python test.py Traceback (most recent call last):
File "test.py", line 2, in
lib = ctypes.cdll.LoadLibrary('./cc.so')
File "/usr/lib/python2.7/ctypes/init.py", line 444, in LoadLibrary
return self._dlltype(name)
File "/usr/lib/python2.7/ctypes/init.py", line 366, in init
self._handle = _dlopen(self._name, mode)
OSError: Error relocating ./cc.so: : initial-exec TLS resolves to dynamic definition in ./cc.so