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/*
* $Id: readlink.c,v 1.1 2005/03/31 13:13:01 baud Exp $
*/
/*
* Copyright (C) 1994-2002 by CERN/IT/PDP/DM
* All rights reserved
*/
#ifndef lint
static char sccsid[] = "@(#)$RCSfile: readlink.c,v $ $Revision: 1.1 $ $Date: 2005/03/31 13:13:01 $ CERN/IT/PDP/DM Felix Hassine";
#endif /* not lint */
#define RFIO_KERNEL 1
#include "rfio.h"
int DLL_DECL rfio_readlink(path,buf, length)
char *path ;
char *buf ;
int length ;
{
int c;
int status ;
int s ;
char *host ;
char * filename;
char *p ;
int rt ;
int rcode , len, parserc;
int uid ;
int gid ;
char buffer[BUFSIZ];
char tmpbuf[MAXFILENAMSIZE];
/*
* The file is local.
*/
INIT_TRACE("RFIO_TRACE");
TRACE( 1, "rfio", " rfio_readlink (%s,%x,%d)",path,buf,length);
if ( ! (parserc = rfio_parseln(path,&host,&filename,NORDLINKS)) ) {
#if !defined(_WIN32)
status = readlink(filename,buf,length) ;
if ( status < 0 ) serrno = 0;
#else
{ serrno = SEOPNOTSUP; status = -1; }
#endif
END_TRACE() ;
rfio_errno = 0;
return status ;
}
if (parserc < 0) {
END_TRACE();
return(-1);
}
s = rfio_connect(host,&rt);
if (s < 0) {
END_TRACE();
return(-1);
}
uid = geteuid() ;
gid = getegid () ;
p = buffer ;
marshall_WORD(p, B_RFIO_MAGIC);
marshall_WORD(p, RQST_READLINK);
status = 2*WORDSIZE + strlen(path) + 1;
marshall_LONG(p, status) ;
if ( status > BUFSIZ ) {
TRACE(2,"rfio","rfio_readlink: request too long %d (max %d)",
status,BUFSIZ);
END_TRACE();
(void) netclose(s);
serrno = E2BIG;
return(-1);
}
if (netwrite_timeout(s,buffer,RQSTSIZE,RFIO_CTRL_TIMEOUT) != RQSTSIZE) {
TRACE(2, "rfio", "readlink: write(): ERROR occured (errno=%d)",errno);
(void) netclose(s);
END_TRACE();
return(-1);
}
p = buffer ;
marshall_WORD(p,uid) ;
marshall_WORD(p,gid) ;
marshall_STRING(p,filename) ;
if (netwrite_timeout(s,buffer,status,RFIO_CTRL_TIMEOUT) != status ) {
TRACE(2, "rfio", "readlink(): write(): ERROR occured (errno=%d)",errno);
(void) netclose(s);
END_TRACE();
return(-1);
}
/*
* Getting back status
*/
if ((c=netread_timeout(s, buffer, 3*LONGSIZE, RFIO_CTRL_TIMEOUT)) != (3*LONGSIZE)) {
if (c == 0) {
serrno = SEOPNOTSUP; /* symbolic links not supported on remote machine */
TRACE(2, "rfio", "rfio_readlink: read(): ERROR occured (serrno=%d)", serrno);
} else
TRACE(2, "rfio", "rfio_readlink: read(): ERROR occured (errno=%d)", errno);
(void) netclose(s);
END_TRACE();
return(-1);
}
p = buffer;
unmarshall_LONG( p, len );
unmarshall_LONG( p, status ) ;
unmarshall_LONG( p, rcode ) ;
if ( status < 0 ) {
TRACE(1,"rfio","rfio_readlink(): rcode = %d , status = %d",rcode, status);
rfio_errno = rcode ;
(void) netclose(s);
END_TRACE();
return(status);
}
/* Length is not of a long size, so RFIO_CTRL_TIMEOUT is enough */
if (netread_timeout(s, buffer, len, RFIO_CTRL_TIMEOUT) != len) {
TRACE(2, "rfio", "rfio_readlink: read(): ERROR occured (errno=%d)", errno);
(void) netclose(s);
END_TRACE();
return(-1);
}
p = buffer ;
if (rcode < length) {
unmarshall_STRING( p, buf ) ;
} else {
unmarshall_STRINGN( p, tmpbuf, MAXFILENAMSIZE) ;
memcpy (buf, tmpbuf, length) ;
}
TRACE (2,"rfio","rfio_readlink succeded: returned %s",buf);
END_TRACE();
(void) netclose (s) ;
return(rcode) ;
}
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