DPNS_READDIRXR(3)					      DPNS Library Functions						 DPNS_READDIRXR(3)

NAME

       dpns_readdirxr - read DPNS directory opened by dpns_opendir in the name server

SYNOPSIS

       #include <sys/types.h>
       #include "dpns_api.h"

       struct dpns_direnrep *dpns_readdirxr (dpns_DIR *dirp, char *se)

DESCRIPTION

       dpns_readdirxr  reads the DPNS directory opened by dpns_opendir in the name server.  This routine returns a pointer to a structure contain-
       ing the current directory entry (basename, guid and filesize) and the replica information.

       struct dpns_rep_info {
	    u_signed64	   fileid;
	    char      status;
	    char      *host;
	    char      *sfn;
       };

       struct dpns_direnrep {
	    u_signed64	   fileid;
	    char      guid[CA_MAXGUIDLEN+1];
	    mode_t	   filemode;
	    u_signed64	   filesize;
	    int       nbreplicas;
	    struct dpns_rep_info *rep;	  /* array of replica info structures */
	    unsigned short d_reclen; /* length of this entry */
	    char      d_name[1];     /* basename in variable length */
       };

       dpns_readdirxr caches a variable number of such entries, depending on the filename size, to minimize the number of  requests  to  the  name
       server.

       dirp   specifies the pointer value returned by dpns_opendir.

       se     allows to restrict the replica entries to a given SE.

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, serrno is set appropriately.

       As  dpns_readdirxr  returns  a null pointer both at the end of the directory and on error, an application wishing to check for error situa-
       tions should set serrno to 0, then call dpns_readdirxr, then check serrno and if it is non-zero, assume an error has occurred.

ERRORS

       EBADF	    File descriptor in DIR structure is invalid.

       ENOMEM	    Memory could not be allocated for unmarshalling the reply.

       EFAULT	    dirp is a NULL pointer.

       EINVAL	    The length of se exceeds CA_MAXHOSTNAMELEN.

       SECOMERR     Communication error.

       ENSNACT	    Name server is not running or is being shutdown.

SEE ALSO

       dpns_closedir(3), dpns_opendir(3), dpns_rewinddir(3)

AUTHOR

       LCG Grid Deployment Team

DPNS
								      $Date$							 DPNS_READDIRXR(3)