DAMASK_EICMD/src/system_routines.f90

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!--------------------------------------------------------------------------------------------------
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!> @author Martin Diehl, Max-Planck-Institut für Eisenforschung GmbH
!> @brief Wrappers to C routines for system operations
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!--------------------------------------------------------------------------------------------------
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module system_routines
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use, intrinsic :: ISO_C_Binding
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use prec
implicit none
private
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public :: &
setCWD, &
getCWD, &
getHostName, &
getUserName, &
signalterm_C, &
signalusr1_C, &
signalusr2_C
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interface
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function setCWD_C(cwd) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_INT, C_CHAR
integer(C_INT) :: setCWD_C
character(kind=C_CHAR), dimension(*), intent(in) :: cwd
end function setCWD_C
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subroutine getCWD_C(cwd, stat) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_INT, C_CHAR
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use prec
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character(kind=C_CHAR), dimension(pPathLen+1), intent(out) :: cwd ! NULL-terminated array
integer(C_INT), intent(out) :: stat
end subroutine getCWD_C
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subroutine getHostName_C(hostname, stat) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_INT, C_CHAR
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use prec
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character(kind=C_CHAR), dimension(pStringLen+1), intent(out) :: hostname ! NULL-terminated array
integer(C_INT), intent(out) :: stat
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end subroutine getHostName_C
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subroutine getUserName_C(username, stat) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_INT, C_CHAR
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use prec
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character(kind=C_CHAR), dimension(pStringLen+1), intent(out) :: username ! NULL-terminated array
integer(C_INT), intent(out) :: stat
end subroutine getUserName_C
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subroutine signalterm_C(handler) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_FUNPTR
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type(C_FUNPTR), intent(in), value :: handler
end subroutine signalterm_C
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subroutine signalusr1_C(handler) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_FUNPTR
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type(C_FUNPTR), intent(in), value :: handler
end subroutine signalusr1_C
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subroutine signalusr2_C(handler) bind(C)
use, intrinsic :: ISO_C_Binding, only: C_FUNPTR
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type(C_FUNPTR), intent(in), value :: handler
end subroutine signalusr2_C
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end interface
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contains
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!--------------------------------------------------------------------------------------------------
!> @brief set the current working directory
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!--------------------------------------------------------------------------------------------------
logical function setCWD(path)
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character(len=*), intent(in) :: path
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setCWD=merge(.True.,.False.,setCWD_C(f_c_string(path)) /= 0_C_INT)
end function setCWD
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!--------------------------------------------------------------------------------------------------
!> @brief get the current working directory
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!--------------------------------------------------------------------------------------------------
function getCWD()
character(len=:), allocatable :: getCWD
character(kind=C_CHAR), dimension(pPathLen+1) :: getCWD_Cstring
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integer(C_INT) :: stat
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call getCWD_C(getCWD_Cstring,stat)
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if(stat == 0) then
getCWD = c_f_string(getCWD_Cstring)
else
error stop 'invalid working directory'
endif
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end function getCWD
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!--------------------------------------------------------------------------------------------------
!> @brief get the host name
!--------------------------------------------------------------------------------------------------
function getHostName()
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character(len=:), allocatable :: getHostName
character(kind=C_CHAR), dimension(pStringLen+1) :: getHostName_Cstring
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integer(C_INT) :: stat
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call getHostName_C(getHostName_Cstring,stat)
if(stat == 0) then
getHostName = c_f_string(getHostName_Cstring)
else
getHostName = 'n/a (Error!)'
endif
end function getHostName
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!--------------------------------------------------------------------------------------------------
!> @brief get the user name
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!--------------------------------------------------------------------------------------------------
function getUserName()
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character(len=:), allocatable :: getUserName
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character(kind=C_CHAR), dimension(pStringLen+1) :: getUserName_Cstring
integer(C_INT) :: stat
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call getUserName_C(getUserName_Cstring,stat)
if(stat == 0) then
getUserName = c_f_string(getUserName_Cstring)
else
getUserName = 'n/a (Error!)'
endif
end function getUserName
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!--------------------------------------------------------------------------------------------------
!> @brief convert C string to Fortran string
!> @details: C string is NULL terminated and, hence, longer by one than the Fortran string
!--------------------------------------------------------------------------------------------------
pure function c_f_string(c_string) result(f_string)
character(kind=C_CHAR), dimension(:), intent(in) :: c_string
character(len=:), allocatable :: f_string
integer :: i
allocate(character(len=size(c_string))::f_string)
arrayToString: do i=1,len(f_string)
if (c_string(i) /= C_NULL_CHAR) then
f_string(i:i)=c_string(i)
else
f_string = f_string(:i-1)
exit
endif
enddo arrayToString
end function c_f_string
!--------------------------------------------------------------------------------------------------
!> @brief convert Fortran string to C string
!> @details: C string is NULL terminated and, hence, longer by one than the Fortran string
!--------------------------------------------------------------------------------------------------
pure function f_c_string(f_string) result(c_string)
character(len=*), intent(in) :: f_string
character(kind=C_CHAR), dimension(len_trim(f_string)+1) :: c_string
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integer :: i
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do i=1,len_trim(f_string)
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c_string(i)=f_string(i:i)
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enddo
c_string(len_trim(f_string)+1) = C_NULL_CHAR
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end function f_c_string
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end module system_routines