bionic (3) dpns_readdir.3.gz

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