NAME

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

SYNOPSIS

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

       struct dirent *dpns_readdir (dpns_DIR *dirp)

DESCRIPTION

       dpns_readdir  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.
       dpns_readdir  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.

NOTE

       Only the fields d_name, d_reclen and on some platforms d_namlen are filled.

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_readdir  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_readdir, then check serrno and if it is non-zero, assume an error has occurred.

ERRORS

       EBADF        File descriptor in DIR structure is invalid.

       EFAULT       dirp is a NULL pointer.

       SECOMERR     Communication error.

       ENSNACT      Name server is not running or is being shutdown.

SEE ALSO

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

AUTHOR

       LCG Grid Deployment Team