fix recursion

// Python's built-in mmap module and NumPy memmap call this variant directly,

// bypassing plain mmap(). Without this interceptor, GekkoFS fds fall through

// to the kernel and return ENXIO.

//

// IMPORTANT: We intentionally fall back to dlsym_mmap (not dlsym_mmap64) for

// non-GekkoFS fds. On 64-bit Linux, mmap64 is implemented as an alias of mmap

// in glibc — dlsym(RTLD_NEXT, "mmap64") can therefore resolve back to our own

// mmap64 interposer, causing infinite recursion → stack overflow → SIGSEGV.

#if defined(__USE_LARGEFILE64) || defined(_LARGEFILE64_SOURCE) ||              \

        defined(__linux__)

DLSYM_WRAPPER(void*, mmap64,

              (void* addr, size_t length, int prot, int flags, int fd,

               off_t offset),

              (addr, length, prot, flags, fd, offset), "mmap64")

void*

mmap64(void* addr, size_t length, int prot, int flags, int fd, off_t offset) {

    gkfs_init_routine_placeholder();

    // Delegate to gkfs_mmap when fd belongs to GekkoFS, otherwise fallback.

    GKFS_OPERATION(mmap, addr, length, prot, flags, fd, offset);

    GKFS_FALLBACK(mmap64, addr, length, prot, flags, fd, offset);

    // Fall back via the plain mmap dlsym wrapper — avoids infinite recursion.

    GKFS_FALLBACK(mmap, addr, length, prot, flags, fd, offset);

}

#endif