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/*
* $Id: preseek.c 3172 2010-02-15 08:51:54Z baud $
*/
/*
* Copyright (C) 1990-2010 by CERN/IT/PDP/DM
* All rights reserved
*/
#ifndef lint
static char sccsid[] = "@(#)$RCSfile: preseek.c,v $ $Revision: 3172 $ $Date: 2010-02-15 09:51:54 +0100 (Mon, 15 Feb 2010) $ CERN/IT/PDP/DM F. Hemmer, A. Trannoy";
#endif /* not lint */
/* preseek.c Remote File I/O - preseeking. */
/*
* System remote file I/O definitions
*/
#define RFIO_KERNEL 1
#ifdef linux
#include <sys/uio.h>
#endif
#include "rfio.h"
#include "rfio_rfilefdt.h"
#include <stdlib.h> /* malloc prototype */
#ifndef min
#define min(a,b) (((a)<(b)) ? (a):(b))
#endif
/*
* Remote file seek
*/
int DLL_DECL rfio_preseek(s,iov,iovnb)
int s ;
int iovnb ;
struct iovec *iov ;
{
int s_index;
char * p ; /* Pointer to buffer */
int i ; /* Loop index */
int temp = 0 ; /* Temporary buffer exists ? */
char *trp= NULL ; /* Pointer to temporary buffer */
char rfio_buf[BUFSIZ];
INIT_TRACE("RFIO_TRACE") ;
TRACE(1,"rfio","rfio_preseek(%d, %x, %d)",s,iov,iovnb) ;
/*
* The file is local.
* Nothing has to be done.
*/
if ((s_index = rfio_rfilefdt_findentry(s,FINDRFILE_WITHOUT_SCAN)) == -1 ) {
END_TRACE() ;
return 0 ;
}
/*
* Checking magic number
*/
if ( rfilefdt[s_index]->magic != RFIO_MAGIC) {
serrno = SEBADVERSION ;
rfio_rfilefdt_freeentry(s_index);
(void) close(s);
END_TRACE();
return -1 ;
}
/*
* Nothing specified.
*/
if ( iovnb == 0 ) {
END_TRACE() ;
return 0 ;
}
/*
* Checking mode 64.
*/
if (rfilefdt[s_index]->mode64) {
struct iovec64 *iov64 ;
int status ;
if ((iov64 = malloc (iovnb * sizeof(struct iovec64))) == NULL)
return (-1) ;
for(i= 0; i<iovnb; i ++) {
iov64[i].iov_base = (off64_t)iov[i].iov_base ;
iov64[i].iov_len = iov[i].iov_len ;
}
status = rfio_preseek64(s,iov64,iovnb) ;
END_TRACE() ;
return (status) ;
}
/*
* Repositionning file mark if needed.
*/
if ( (rfilefdt[s_index]->readissued || rfilefdt[s_index]->preseek) && rfilefdt[s_index]->lseekhow == -1 ) {
rfilefdt[s_index]->lseekhow= SEEK_SET ;
rfilefdt[s_index]->lseekoff= rfilefdt[s_index]->offset ;
}
/*
* Resetting flags.
* preseek() is forbidden when RFIO aren't buffered.
*/
rfilefdt[s_index]->eof= 0 ;
rfilefdt[s_index]->preseek= 0 ;
rfilefdt[s_index]->nbrecord= 0 ;
rfilefdt[s_index]->readissued= 0 ;
if ( rfilefdt[s_index]->_iobuf.base ) {
rfilefdt[s_index]->_iobuf.count= 0 ;
rfilefdt[s_index]->_iobuf.ptr= iodata(rfilefdt[s_index]) ;
}
else {
errno= EINVAL ;
END_TRACE() ;
return -1 ;
}
/*
* Is rfio_buf large enough to contain the request ?
* If not a temporary buffer is allocated.
* THe request is then sent.
*/
if ( (BUFSIZ-RQSTSIZE)/(2*LONGSIZE) < iovnb ) {
temp= 1 ;
if ((trp= (char *)malloc(RQSTSIZE+2*LONGSIZE*iovnb)) == NULL) return -1 ;
}
else {
trp= rfio_buf ;
}
p= trp ;
marshall_WORD(p,RFIO_MAGIC) ;
marshall_WORD(p,RQST_PRESEEK) ;
marshall_LONG(p,rfilefdt[s_index]->_iobuf.dsize) ;
marshall_LONG(p,iovnb) ;
p= trp + RQSTSIZE ;
for(i= 0; i<iovnb; i ++) {
marshall_LONG(p,iov[i].iov_base) ;
marshall_LONG(p,iov[i].iov_len) ;
}
TRACE(2,"rfio","rfio_preseek: sending %d bytes",RQSTSIZE+2*LONGSIZE*iovnb) ;
if (netwrite_timeout(s,trp,RQSTSIZE+2*LONGSIZE*iovnb,RFIO_CTRL_TIMEOUT) != (RQSTSIZE+2*LONGSIZE*iovnb)) {
TRACE(2,"rfio","rfio_preseek: write(): ERROR occured (errno=%d)",errno) ;
if ( temp ) (void) free(trp) ;
END_TRACE() ;
return -1 ;
}
/*
* Freeing the temporary buffer if
* it has been created.
*/
if ( temp ) (void) free(trp) ;
/*
* Getting data from the network.
*/
for(;;) {
WORD req ;
int status ;
int rcode ;
int msgsiz ;
msgsiz= rfilefdt[s_index]->_iobuf.hsize + rfilefdt[s_index]->_iobuf.dsize ;
TRACE(2, "rfio", "rfio_preseek: reading %d bytes",msgsiz) ;
if (netread_timeout(s,rfilefdt[s_index]->_iobuf.base,msgsiz,RFIO_CTRL_TIMEOUT) != msgsiz) {
TRACE(2,"rfio","rfio_preseek: read(): ERROR occured (errno=%d)",errno) ;
END_TRACE() ;
return -1 ;
}
p= rfilefdt[s_index]->_iobuf.base ;
unmarshall_WORD(p,req) ;
unmarshall_LONG(p,status) ;
unmarshall_LONG(p,rcode) ;
unmarshall_LONG(p,msgsiz) ;
switch(req) {
case RQST_FIRSTSEEK:
rfio_errno = rcode ;
TRACE(1,"rfio","rfio_preseek: status %d, rcode %d",status,rcode) ;
if ( status == -1 ) {
END_TRACE() ;
return -1 ;
}
rfilefdt[s_index]->preseek= ( status == iovnb ) ? 2 : 1 ;
rfilefdt[s_index]->nbrecord= status ;
rfilefdt[s_index]->_iobuf.ptr= iodata(rfilefdt[s_index]) ;
rfilefdt[s_index]->_iobuf.count= 0 ;
END_TRACE() ;
return 0 ;
case RQST_PRESEEK:
case RQST_LASTSEEK:
case RQST_READAHEAD:
break ;
default:
TRACE(1,"rfio","rfio_preseek(): Bad control word received") ;
serrno= SEINTERNAL ;
END_TRACE() ;
return -1 ;
}
}
}
/*
* FORTRAN bindings.
*/
#if defined(_AIX)
int DLL_DECL presee(sptr,iov,iovnbptr)
#else
int DLL_DECL presee_(sptr,iov,iovnbptr)
#endif /* AIX */
int * sptr ;
struct iovec * iov ;
int * iovnbptr ;
{
int status ;
status= rfio_preseek(*sptr,iov,*iovnbptr) ;
return status ;
}
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