__NR_munmap
res = stub_syscall2(__NR_munmap,
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, __NR_munmap,
__SYSCALL(__NR_munmap, sys_munmap)
return my_syscall2(__NR_munmap, addr, length);
__SYSCALL(__NR_munmap, sys_munmap)
sret = syscall(__NR_munmap, ptr, size);