system_isblk(3f) - [M_system:QUERY_FILE] checks if argument is a block device (LICENSE:PD)
elemental impure logical function system_isblk(pathname)
character(len=*),intent(in) :: pathname
logical :: system_isblk
The isblk(3f) function checks if path is a path to a block device.
path a character string representing a block device pathname. Trailing spaces are ignored.
The system_isblk() function should always be successful and no
return value is reserved to indicate an error.
No errors are defined.
system_isreg(3f), system_stat(3f), system_isdir(3f), system_perm(3f)
check if filename is a block device
program demo_system_isblk
use M_system, only : system_isblk
implicit none
integer :: i
character(len=80),parameter :: names(*)=[ &
'/tmp ', &
'/tmp/NOTTHERE ', &
'/usr/local ', &
'. ', &
'block_device.tst', &
'PROBABLY_NOT ']
do i=1,size(names)
write(*,*)' is ',trim(names(i)),' a block device? ', &
& system_isblk(names(i))
enddo
end program demo_system_isblk
Results:
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | pathname |
elemental impure function system_isblk(pathname)
implicit none
! ident_9="@(#) M_system system_isblk(3f) determine if pathname is a block device"
character(len=*),intent(in) :: pathname
logical :: system_isblk
character(kind=c_char,len=1),allocatable :: temp(:)
interface
function c_isblk(pathname) bind (C,name="my_isblk") result (c_ierr)
import c_char,c_int
character(kind=c_char,len=1),intent(in) :: pathname(*)
integer(kind=c_int) :: c_ierr
end function c_isblk
end interface
temp = str2_carr(trim(pathname)) ! kludge for bug in ifort (IFORT) 2021.3.0 20210609
if(c_isblk(temp).eq.1)then
system_isblk=.true.
else
system_isblk=.false.
endif
end function system_isblk