NAME
rfiosetopt - set RFIO options
SYNOPSIS
#include <sys/types.h>
#include "rfio_api.h"
int rfiosetopt (int opt, int *pval, int len)
int rfio_setbufsize (int s, int bufsize)
DESCRIPTION
rfiosetopt sets the RFIO option opt to the content of the memory cell
pointed by pval.
rfio_setbufsize sets the size of the readahead buffer to be used on a
particular socket connection.
opt can have on of the following values:
RFIO_READOPT
The value pointed by pval can be 0, RFIO_READBUF,
RFIO_READAHEAD or RFIO_STREAM (V3).
If set to zero, a normal read will be used (one request
to the server per read).
If set to RFIO_READBUF, an internal buffer is allocated
in the client API, each call to the server fills this
buffer and the user buffer is filled from the internal
buffer. There is one server call per buffer fill.
If set to RFIO_READAHEAD, an initial call is sent to the
server which pushes data to the client buffer until end
of file is reached or an error occurs or a new request
comes from the client. There is no intermediate buffer
unless RFIO_READBUF|RFIO_READAHEAD is specified.
If RFIO_STREAM is set, the V3 protocol is enabled. This
uses 2 socket connections between the client and the
server and the server itself is multi-threaded allowing
overlap of disk and network operations. The data is
pushed on the data socket until end of file is reached or
an error occurs. The transfer can be interrupted by
sending a packet on the control socket.
Default is RFIO_READBUF.
The default internal buffer size is 128kB, but the buffer
size can be set with an entry RFIO IOBUFSIZE in
shift.conf or thru the environment variable
RFIO_IOBUFSIZE.
RFIO_NETOPT
The value pointed by pval can be RFIO_NONET or RFIO_NET.
If set to RFIO_NONET, the NET entries in shift.conf are
ignored. Default is RFIO_NET.
RFIO_NETRETRYOPT
The value pointed by pval can be RFIO_RETRYIT or
RFIO_NOTIME2RETRY.
If set to RFIO_RETRYIT, there will be retries on failing
connect. The number of retries is given by the
environment variable RFIO_CONRETRY or the RFIO CONRETRY
entry in shift.conf. The retry interval (in seconds) is
given by the environment variable RFIO_CONRETRYINT or the
RFIO CONRETRYINT entry.
If set to RFIO_NOTIME2RETRY, there will be no retry on
failing connect.
Default is RFIO_RETRYIT.
RFIO_CONNECTOPT
The value pointed by pval can be RFIO_NOLOCAL or
RFIO_FORCELOCAL. If set to RFIO_FORCELOCAL, no parsing
is done on pathname. The file is assumed to be local.
Default is RFIO_NOLOCAL.
The len argument is ignored.
s is the file descriptor of the receiving socket.
bufsize is the size of the readahead buffer to be used.
RETURN VALUE
rfiosetopt returns 0 if the operation was successful or -1 if the
operation failed. In the latter case, serrno is set appropriately.
ERRORS
ENOMEM buffer could not be allocated.
EINVAL opt is not a valid option, bufsize is negative or the user
tries to change the buffer size after the actual I/O has
started.
SEE ALSO
rfio_open(3), rfioreadopt(3)
AUTHOR
LCG Grid Deployment Team
LCG $Date: 2010-02-15 10:01:40 +0100 (Mon, 15 Feb 2010) RFIOSETOPT(3)