demo_system_rewinddir Program

     program demo_system_rewinddir
     use M_system, only : system_opendir,system_readdir
     use M_system, only : system_rewinddir,system_closedir
     use iso_c_binding
     implicit none

     type(c_ptr)                  :: dir
     character(len=:),allocatable :: filename
     integer                      :: i, ierr
     !>>> open directory stream to read from
     call system_opendir('.',dir,ierr)
     !>>> read directory stream twice
     do i=1,2
        write(*,'(a,i0)')'PASS ',i
        do
           call system_readdir(dir,filename,ierr)
           if(filename.eq.' ')exit
           write(*,*)filename
        enddo
        !>>> rewind directory stream
        call system_rewinddir(dir)
     enddo
     !>>> close directory stream
     call system_closedir(dir,ierr)

     end program demo_system_rewinddir