v7 man page for close

CLOSE(2)							System Calls Manual							  CLOSE(2)

NAME
       close  -  close a file

SYNOPSIS
       close(fildes)

DESCRIPTION
       Given  a file descriptor such as returned from an open, creat, dup or pipe(2) call, close closes the associated file.  A close of all files
       is automatic on exit, but since there is a limit on the number of open files per process, close is necessary for programs which	deal  with
       many files.

       Files are closed upon termination of a process, and certain file descriptors may be closed by exec(2) (see ioctl(2)).

SEE ALSO
       creat(2), open(2), pipe(2), exec(2), ioctl(2)

DIAGNOSTICS
       Zero is returned if a file is closed; -1 is returned for an unknown file descriptor.

ASSEMBLER
       (close = 6.)
       (file descriptor in r0)
       sys close

																	  CLOSE(2)