HP C/iX Library Reference Manual (30026-90004)

Chapter 5 267
HP C/iX Library Function Descriptions
open
value of n is defined as follows:
If the Ds option is not specified, the default is not to return any disk space
allocated beyond the end-of-file indicator.
E
n The E option specifies the maximum number of extents that can be
allocated to the file. The maximum value is 32. The default value, if the E
option is not specified, is 8 extents.
F
n The F option indicates the value used as the file code if this call to fopen()
creates the file. If the F option is not specified, the file code is zero.
L If specified, the L option indicates that dynamic locking should be allowed
on this file.
M
n The M option controls multiaccess. The option character is followed by an
integer that indicates the level of multiaccess for this open request. The
levels are specified in the MPE/iX Intrinsics Reference Manual under the
FOPEN intrinsic description.
Q If the Q option is specified, file equations are disallowed. The default is to
allow file equations.
R
n The R option specifies the size of the record if the file is created by this
open request. If the V option is also used, this option specifies the
maximum size of the variable-sized records. The option letter is followed
by a decimal number that is equal to the number of bytes in the record
size. Notice that the number must be positive. A byte count is always
specified. If the R option is not provided, then the default record size is 256
bytes.
S
n The S option specifies the maximum size of the file. The value of n is the
maximum size of the file in records for text and binary streams, and in
bytes for byte streams. Notice that if the S parameter is not specified, the
default is 4095.
Te If the Te option is specified, the file is saved in the temporary file domain.
If the Te option is not specified and the file is a new file, the default is to
save the file as a permanent file. If the file is old, the default is to not
change the disposition.
Tm If the Tm option is specified, disk read functions trim editor line numbers, if
they exist, and trailing blanks from each record of an ASCII fixed record
length file before returning file data to the reader. This option is used on
files opened with read only access. Random access to file data using
fseek() and lseek() is not permitted. The default is to not trim editor
line numbers and blanks.
0 Don't return any disk space allocated beyond the end-of-file indicator.
1 Return to the system any disk space allocated beyond the end-of-file indicator. The EOF
becomes the file limit. No records may be added to the file beyond this new limit.
2 Return to the system any disk space allocated beyond the end-of-file indicator, but do not set
the file limit to EOF, and allow records to be added to the file up to the file limit.