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 containing 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 situations  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