char buf[1024];

Why not allocate the buffer dynamically to remove this limitation? I am passing a structure to the driver that contains, among other things, the name of the target device of size PATH_MAX, and I do not fit into 1024 bytes. Everything works in the client in C, but not in python with your module.

Linked PRs

• gh-95380: Removing the 1024 bytes limit in the fcntl_ioctl_impl functions. #95526
• gh-95380: Remove the 1024 bytes limit in fcntl.fcntl() and fcntl.ioctl() #132907