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NAME
     open - open for reading or writing

SYNOPSIS
     (open = 5.)
     sys open; name; mode
     (file descriptor in r0)

     open(name, mode)
     char *name;

DESCRIPTION
     Open opens the file name for reading (if mode is 0), writing
     (if mode is 1) or for both reading and writing (if mode is
     2).  Name is the address of a string of ASCII characters
     representing a path name, terminated by a null character.

     The returned file descriptor should be saved for subsequent
     calls to read, write, and close.

SEE ALSO
     creat (II), read (II), write (II), close (II)

DIAGNOSTICS
     The error bit (c-bit) is set if the file does not exist, if
     one of the necessary directories does not exist or is
     unreadable, if the file is not readable (resp. writable), or
     if too many files are open.  From C, a -1 value is returned
     on an error.

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