V1/man/man2/open.2

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        11/3/71                                                SYS OPEN (II)


NAME              open -- open for reading or writing
SYNOPSIS          sys      open; name; mode             / open = 5.
                  (descriptor in r0)

DESCRIPTION       open opens the file name for reading (if mode is 0) or writing (if
                  mode is non--zero), name is the address of a string of ASCII
                  characters representing a path name, terminated by a null character.

                  The file descriptor should be saved for subsequent calls to read (or
                  write) and close.

                  In both the read and write case the file pointer is set to the
                  beginning of the file.

                  If the last link to an open file is removed, the file is not
                  destroyed until it is closed.

FILES

SEE ALSO          creat, read, write, close

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, or if the
                  file is not readable.

B UGS

OWNER             ken, dmr