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.\" @(#)$RCSfile: Cns_readdirxr.man,v $ $Revision: 1.2 $ $Date: 2006/03/16 13:02:57 $ CERN IT-GD/SC Jean-Philippe Baud
.\" Copyright (C) 2005 by CERN/IT/GD/SC
.\" All rights reserved
.\"
.TH CNS_READDIRXR 3 "$Date: 2006/03/16 13:02:57 $" CASTOR "Cns Library Functions"
.SH NAME
Cns_readdirxr \- read CASTOR directory opened by
.B Cns_opendir
in the name server
.SH SYNOPSIS
.B #include <sys/types.h>
.br
\fB#include "Cns_api.h"\fR
.sp
.BI "struct Cns_direnrep *Cns_readdirxr (Cns_DIR *" dirp ,
.BI "char *" se )
.SH DESCRIPTION
.B Cns_readdirxr
reads the CASTOR directory opened by
.B Cns_opendir
in the name server.
This routine returns a pointer to a structure containing the current directory
entry (basename, guid and filesize) and the replica information.
.PP
.nf
.ft CW
struct Cns_rep_info {
u_signed64 fileid;
char status;
char *host;
char *sfn;
};
struct Cns_direnrep {
u_signed64 fileid;
char guid[CA_MAXGUIDLEN+1];
mode_t filemode;
u_signed64 filesize;
int nbreplicas;
struct Cns_rep_info *rep; /* array of replica info structures */
unsigned short d_reclen; /* length of this entry */
char d_name[1]; /* basename in variable length */
};
.ft
.fi
.PP
.B Cns_readdirxr
caches a variable number of such entries, depending on the filename size, to
minimize the number of requests to the name server.
.TP
.I dirp
specifies the pointer value returned by
.BR Cns_opendir .
.TP
.I se
allows to restrict the replica entries to a given SE.
.SH RETURN VALUE
This routine returns a pointer to a structure containing the current directory
entry if the operation was successful or NULL if the end of the directory was
reached or if the operation failed. When the end of the directory is encountered,
serrno is not changed. If the operation failed,
.B serrno
is set appropriately.
As Cns_readdirxr returns a null pointer
both at the end of the directory and on error, an application wishing to check
for error situations should set
.B serrno
to 0, then call Cns_readdirxr, then check
.B serrno
and if it is non-zero, assume an error has occurred.
.SH ERRORS
.TP 1.3i
.B EBADF
File descriptor in DIR structure is invalid.
.TP
.B ENOMEM
Memory could not be allocated for unmarshalling the reply.
.TP
.B EFAULT
.I dirp
is a NULL pointer.
.TP
.B EINVAL
The length of
.I se
exceeds
.BR CA_MAXHOSTNAMELEN .
.TP
.B SENOSHOST
Host unknown.
.TP
.B SENOSSERV
Service unknown.
.TP
.B SECOMERR
Communication error.
.TP
.B ENSNACT
Name server is not running or is being shutdown.
.SH SEE ALSO
.BR Cns_closedir(3) ,
.BR Cns_opendir(3) ,
.B Cns_rewinddir(3)
.SH AUTHOR
\fBCASTOR\fP Team <castor.support@cern.ch>
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