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!F90 ISO_C_BINGING wrapper for socket communication.
!Copyright (C) 2013, Michele Ceriotti
!Permission is hereby granted, free of charge, to any person obtaining
!a copy of this software and associated documentation files (the
!"Software"), to deal in the Software without restriction, including
!without limitation the rights to use, copy, modify, merge, publish,
!distribute, sublicense, and/or sell copies of the Software, and to
!permit persons to whom the Software is furnished to do so, subject to
!the following conditions:
!The above copyright notice and this permission notice shall be included
!in all copies or substantial portions of the Software.
!THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
!EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
!MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
!IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
!CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
!TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
!SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
!Contains both the functions that transmit data to the socket and read the data
!back out again once finished, and the function which opens the socket initially.
!Functions:
! open_socket: Opens a socket with the required host server, socket type and
! port number.
! write_buffer: Writes a string to the socket.
! read_buffer: Reads data from the socket.
MODULE F90SOCKETS
USE ISO_C_BINDING
IMPLICIT NONE
INTERFACE writebuffer
MODULE PROCEDURE writebuffer_s, &
writebuffer_d, writebuffer_dv, &
writebuffer_i
END INTERFACE
INTERFACE readbuffer
MODULE PROCEDURE readbuffer_s, &
readbuffer_dv, readbuffer_d, &
readbuffer_i
END INTERFACE
INTERFACE
SUBROUTINE open_csocket(psockfd, inet, port, host) BIND(C, name="open_socket")
USE ISO_C_BINDING
INTEGER(KIND=C_INT) :: psockfd, inet, port
CHARACTER(KIND=C_CHAR), DIMENSION(*) :: host
END SUBROUTINE open_csocket
SUBROUTINE writebuffer_csocket(psockfd, pdata, plen) BIND(C, name="writebuffer")
USE ISO_C_BINDING
INTEGER(KIND=C_INT) :: psockfd
TYPE(C_PTR), VALUE :: pdata
INTEGER(KIND=C_INT) :: plen
END SUBROUTINE writebuffer_csocket
SUBROUTINE readbuffer_csocket(psockfd, pdata, plen) BIND(C, name="readbuffer")
USE ISO_C_BINDING
INTEGER(KIND=C_INT) :: psockfd
TYPE(C_PTR), VALUE :: pdata
INTEGER(KIND=C_INT) :: plen
END SUBROUTINE readbuffer_csocket
END INTERFACE
CONTAINS
SUBROUTINE open_socket(psockfd, inet, port, host)
IMPLICIT NONE
INTEGER, INTENT(IN) :: inet, port
INTEGER, INTENT(OUT) :: psockfd
CHARACTER(LEN=1024), INTENT(IN) :: host
CHARACTER(LEN=1,KIND=C_CHAR) :: chost(1024)
CALL fstr2cstr(host, chost)
CALL open_csocket(psockfd, inet, port, host)
END SUBROUTINE
SUBROUTINE fstr2cstr(fstr, cstr, plen)
IMPLICIT NONE
CHARACTER(LEN=*), INTENT(IN) :: fstr
CHARACTER(LEN=1,KIND=C_CHAR), INTENT(OUT) :: cstr(:)
INTEGER, INTENT(IN), OPTIONAL :: plen
INTEGER i,n
IF (PRESENT(plen)) THEN
n = plen
DO i=1,n
cstr(i) = fstr(i:i)
ENDDO
ELSE
n = LEN_TRIM(fstr)
DO i=1,n
cstr(i) = fstr(i:i)
ENDDO
cstr(n+1) = C_NULL_CHAR
END IF
END SUBROUTINE
SUBROUTINE writebuffer_d (psockfd, fdata)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd
REAL(KIND=8), INTENT(IN) :: fdata
REAL(KIND=C_DOUBLE), TARGET :: cdata
cdata = fdata
CALL writebuffer_csocket(psockfd, c_loc(cdata), 8)
END SUBROUTINE
SUBROUTINE writebuffer_i (psockfd, fdata)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd, fdata
INTEGER(KIND=C_INT), TARGET :: cdata
cdata = fdata
CALL writebuffer_csocket(psockfd, c_loc(cdata), 4)
END SUBROUTINE
SUBROUTINE writebuffer_s (psockfd, fstring, plen)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd
CHARACTER(LEN=*), INTENT(IN) :: fstring
INTEGER, INTENT(IN) :: plen
INTEGER :: i
CHARACTER(LEN=1, KIND=C_CHAR), TARGET :: cstring(plen)
DO i = 1,plen
cstring(i) = fstring(i:i)
ENDDO
CALL writebuffer_csocket(psockfd, c_loc(cstring(1)), plen)
END SUBROUTINE
SUBROUTINE writebuffer_dv(psockfd, fdata, plen)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd, plen
REAL(KIND=8), INTENT(IN), TARGET :: fdata(plen)
CALL writebuffer_csocket(psockfd, c_loc(fdata(1)), 8*plen)
END SUBROUTINE
SUBROUTINE readbuffer_d (psockfd, fdata)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd
REAL(KIND=8), INTENT(OUT) :: fdata
REAL(KIND=C_DOUBLE), TARGET :: cdata
CALL readbuffer_csocket(psockfd, c_loc(cdata), 8)
fdata=cdata
END SUBROUTINE
SUBROUTINE readbuffer_i (psockfd, fdata)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd
INTEGER, INTENT(OUT) :: fdata
INTEGER(KIND=C_INT), TARGET :: cdata
CALL readbuffer_csocket(psockfd, c_loc(cdata), 4)
fdata = cdata
END SUBROUTINE
SUBROUTINE readbuffer_s (psockfd, fstring, plen)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd
CHARACTER(LEN=*), INTENT(OUT) :: fstring
INTEGER, INTENT(IN) :: plen
INTEGER :: i
CHARACTER(LEN=1, KIND=C_CHAR), TARGET :: cstring(plen)
CALL readbuffer_csocket(psockfd, c_loc(cstring(1)), plen)
fstring=""
DO i = 1,plen
fstring(i:i) = cstring(i)
ENDDO
END SUBROUTINE
SUBROUTINE readbuffer_dv(psockfd, fdata, plen)
USE ISO_C_BINDING
INTEGER, INTENT(IN) :: psockfd, plen
REAL(KIND=8), INTENT(OUT), TARGET :: fdata(plen)
CALL readbuffer_csocket(psockfd, c_loc(fdata(1)), 8*plen)
END SUBROUTINE
END MODULE
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