ssize_t read( int fd, void *buffer, size_t count ) { ssize_t rc; rtems_libio_t *iop; rtems_libio_check_fd( fd ); iop = rtems_libio_iop( fd ); rtems_libio_check_is_open( iop ); rtems_libio_check_buffer( buffer ); rtems_libio_check_count( count ); rtems_libio_check_permissions_with_error( iop, LIBIO_FLAGS_READ, EBADF ); /* * Now process the read(). */ if ( !iop->handlers->read_h ) rtems_set_errno_and_return_minus_one( ENOTSUP ); rc = (*iop->handlers->read_h)( iop, buffer, count ); if ( rc > 0 ) iop->offset += rc; return rc; }
ssize_t write( int fd, const void *buffer, size_t count ) { ssize_t rc; rtems_libio_t *iop; rtems_libio_check_fd( fd ); iop = rtems_libio_iop( fd ); rtems_libio_check_is_open( iop ); rtems_libio_check_buffer( buffer ); rtems_libio_check_count( count ); rtems_libio_check_permissions_with_error( iop, LIBIO_FLAGS_WRITE, EBADF ); /* * Now process the write() request. */ rc = (*iop->pathinfo.handlers->write_h)( iop, buffer, count ); if ( rc > 0 ) iop->offset += rc; return rc; }
/** * POSIX 1003.1b 6.4.1 - Read From a File */ ssize_t read( int fd, void *buffer, size_t count ) { rtems_libio_t *iop; rtems_libio_check_fd( fd ); iop = rtems_libio_iop( fd ); rtems_libio_check_is_open( iop ); rtems_libio_check_buffer( buffer ); rtems_libio_check_count( count ); rtems_libio_check_permissions_with_error( iop, LIBIO_FLAGS_READ, EBADF ); /* * Now process the read(). */ return (*iop->pathinfo.handlers->read_h)( iop, buffer, count ); }