RTEMS 4.9.5 On-Line Library

Device Handler Table Functions

RTEMS Filesystem Design Guide

6.4.4: Device Handler Table Functions

device_open() for Devices

device_close() for Devices

device_read() for Devices

device_write() for Devices

device_ioctl() for Devices

device_lseek() for Devices

IMFS_stat() for Devices

IMFS_fchmod() for Devices

No ftruncate() for Devices

No fpathconf() for Devices

No fsync() for Devices

No fdatasync() for Devices

Handler table functions are defined in a rtems_filesystem_file_handlers_r structure. It defines functions that are specific to a node type in a given filesystem. One table exists for each of the filesystem's node types. The structure definition appears below. It is followed by general developmental information on each of the functions associated with devices contained in this function management structure.

typedef struct {
  rtems_filesystem_open_t           open;
  rtems_filesystem_close_t          close;
  rtems_filesystem_read_t           read;
  rtems_filesystem_write_t          write;
  rtems_filesystem_ioctl_t          ioctl;
  rtems_filesystem_lseek_t          lseek;
  rtems_filesystem_fstat_t          fstat;
  rtems_filesystem_fchmod_t         fchmod;
  rtems_filesystem_ftruncate_t      ftruncate;
  rtems_filesystem_fpathconf_t      fpathconf;
  rtems_filesystem_fsync_t          fsync;
  rtems_filesystem_fdatasync_t      fdatasync;
} rtems_filesystem_file_handlers_r;

RTEMS Filesystem Design Guide