The best replacement for ioctl is fcntl.

The best alternatives to ioctl are rated as following:
★★★★★  fcntl
★★★★★  netlink
★★★★  system call
★★★★  unlocked_ioctl
★★★  irp
★★★  mmap
★★★  sysctl
★★  devctl
★  xioctl
★  netlink socket
★  sysfs

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Google Trends

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ioctl
fcntl
netlink