Open Watcom FORTRAN 77 Language Reference

FORTRAN Statements
2.62 OPEN Statement
OPEN (oplist)
where:
oplist
must include the UNIT= specifier and may include at most one of each of the open
specifiers listed below. Specifiers are separated by commas.
[UNIT =] u
IOSTAT = ios
ERR = s
FILE = fin
STATUS = sta
ACCESS = acc
FORM = fm
RECL = rcl
BLANK = blnk
As an extension to the FORTRAN 77 language, the following inquiry specifiers are also
supported.
ACTION = act
CARRIAGECONTROL = cc
RECORDTYPE = rct
BLOCKSIZE = bl
SHARE = shr
The OPEN statement may be used to connect an existing file to a unit, create a file that is preconnected,
create a file and connect it to a unit, or change certain specifications of a connection between a file and a
unit.
Open Specifiers
[UNIT =] u
IOSTAT = ios
ERR = s
u is an external unit identifier. An external unit identifier is a non-negative integer
expression. If the optional UNIT= specifier is omitted then the specifier must be the first
item in the list of specifiers.
is an input/output status specifier. The integer variable or integer array element ios is
defined with zero if no error condition exists or a positive integer value if an error condition
exists.
is an error specifier and s is a statement label. When an error occurs, execution is
transferred to the statement labelled by s.
OPEN Statement 111