Return #t if the block DEVICE is in use, #f otherwise. This is inspired from fdisk_device_is_used function of util-linux. This is particularly useful for devices that do not appear in /proc/self/mounts like overlayfs lowerdir backend device.

Return a list of <interface> objects, each denoting a configured network interface. This is implemented using the 'getifaddrs' libc function.

Unlock PORT, a port returned by 'lock-file', and close it.

Return a <window-size> structure describing the terminal at PORT, or raise a 'system-error' if PORT is not backed by a terminal. This procedure corresponds to the TIOCGWINSZ ioctl.

Convert FLAGS, a logical or of ST_* constants as returned by 'file-system-mount-flags', to the corresponding logical or of MS_* constants.

Add N to the kernel's entropy count (the value that can be read from /proc/sys/kernel/random/entropy_avail). PORT-OR-FD must correspond to /dev/urandom or /dev/random. Raise to 'system-error with EPERM when the caller lacks root privileges.

Return a <file-system> data structure describing the file system mounted at FILE.

Wait and acquire an exclusive lock on FILE. Return an open port according to MODE.

Set the network mask of interface NAME to SOCKADDR.