funchook.nim
The project contains static libraries for Linux, for Windows and other OS please build funchook manually and enable FUNCHOOK_DYNAMIC_LINK switch
Note: need help to build static libraries for other OSes/compilers
Installation
nimble install funchookUsage
import funchook
proc my_add(a, b: int): int = a + b
## original proc to be hooked
var add_func = my_add
proc hook_add(a, b: int): int =
## proc to replace my_add
# call original proc with trampoline
echo add_func(a, b)
result = a * b
var
h = initHook()
rv: FUNCHOOK_ERROR
if h == nil:
quit("Error: create funchook failed")
rv = h.prepare(addr add_func, hook_add)
if rv != SUCCESS:
quit("Error: " & h.errorMessage())
assert my_add(4, 5) == 9, "pre-hook"
rv = h.install(0)
if rv != SUCCESS:
quit("Error: " & h.errorMessage())
assert my_add(4, 5) == 20, "post-hook"
