Create a new child process by duplicating the current parent process. Unlike the fork system call, clone accepts FLAGS that specify which resources are shared between the parent and child processes.

Make FD the controlling terminal of the current process (with the TIOCSCTTY ioctl), redirect standard input, standard output and standard error output to this terminal, and close FD.

Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_* constants from <sys/mount.h>.

Set the address of network interface NAME to SOCKADDR.

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

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.

Return the list of mounts (<mount> records) visible in the namespace of the current process.

This procedure improves on Guile's 'scandir' procedure in several ways:

1. Systematically encode decode file names using STRING->POINTER and POINTER->STRING (UTF-8 by default; this works around a defect in Guile 2.0/2.2 where 'scandir' decodes file names according to the current locale, which is not always desirable.

2. Each entry that is returned has the form (NAME . PROPERTIES). PROPERTIES is an alist showing additional properties about the entry, as found in 'struct dirent'. An entry may look like this:

("foo.scm" (type . regular) (inode . 123456))

Callers must be prepared to deal with the case where 'type' is 'unknown' since some file systems do not provide that information.

3. Raise to 'system-error' when NAME cannot be opened.