demo_process_open_write.f90 Source File

    program demo_process_open_write
    use, intrinsic :: iso_fortran_env, only : &
    & stdin=>input_unit, &
    & stdout=>output_unit, &
    & stderr=>error_unit
    use M_process ,ONLY: process_open_write, process_writeline
    use M_process ,ONLY: streampointer, process_close
    implicit none
    type(streampointer) :: fp
    ! line of data to write
    character(len=4096) :: line
    integer             :: ierr
    integer             :: i
      ! open process to write to
      call process_open_write('cat -n',fp,ierr)
      write(stdout,*)'OPENWTEST: process is opened with status ',ierr
      ! remember C and Fortran I/O are often independent of each other
      flush(stdout)
      ierr=0
      line='xxxxxxxxxxxxxxxxxxxxxxxxxxx'
      do i=1,10
        ! write a line to the process
        call process_writeline(trim(line),fp,ierr)
        if(ierr.lt.0)then
          write(stdout,*)'OPENWTEST: ierr is ',ierr
          exit
        endif
      enddo
      call process_close(fp,ierr)
      write(stdout,*)'OPENWTEST: process closed with status ',ierr
    end program demo_process_open_write