path: root/winsup/cygwin/devices.in

%import {
#include "winsup.h"
#include "devices.h"
#include "sys/cygwin.h"
#include "tty.h"
#include "pinfo.h"
#include "shared_info.h"
#include "path.h"
#include "fhandler.h"
#include "ntdll.h"

typedef const device *KR_device_t;
}
%type KR_device_t
%local {

static int
exists_internal (const device&)
{
  return false;
}

static int
exists (const device&)
{
  return true;
}

/* Check existence of POSIX devices backed by real NT devices. */
static int
exists_ntdev (const device& dev)
{
  WCHAR wpath[MAX_PATH];
  UNICODE_STRING upath;
  OBJECT_ATTRIBUTES attr;
  HANDLE h;
  NTSTATUS status;

  sys_mbstowcs (wpath, MAX_PATH, dev.native);
  RtlInitUnicodeString (&upath, wpath);
  InitializeObjectAttributes (&attr, &upath, OBJ_CASE_INSENSITIVE, NULL, NULL);
  /* Except for the serial IO devices, the native paths are
     direct device paths, not symlinks, so every status code
     except for "NOT_FOUND" means the device exists. */
  status = NtOpenSymbolicLinkObject (&h, SYMBOLIC_LINK_QUERY, &attr);
  switch (status)
    {
    case STATUS_OBJECT_NAME_NOT_FOUND:
    case STATUS_OBJECT_PATH_NOT_FOUND:
      return false;
    case STATUS_SUCCESS:
      NtClose (h);
    default:
      break;
    }
  return true;
}

/* Don't list via readdir but allow as a direct reference. */
static int
exists_ntdev_silent (const device& dev)
{
  return exists_ntdev (dev) ? -1 : false;
}

static int
exists_console (const device& dev)
{
  fh_devices devn = *const_cast<device *> (&dev);
  switch (devn)
    {
    case FH_CONSOLE:
    case FH_CONIN:
    case FH_CONOUT:
      return fhandler_console::exists ();
    default:
      /* Only show my own console device (for now?) */
      return iscons_dev (myself->ctty) && myself->ctty == devn;
    }
}

static int
exists_pty (const device& dev)
{
  /* Only existing slave ptys. */
  return cygwin_shared->tty.connect (dev.get_minor ()) != -1;
}

const device dev_cygdrive_storage =
  {"/cygdrive", {FH_CYGDRIVE}, "", exists};

const device dev_fs_storage =
  {"", {FH_FS}, "", exists};

const device dev_proc_storage =
  {"", {FH_PROC}, "", exists};

const device dev_procnet_storage =
  {"", {FH_PROCNET}, "", exists};

const device dev_procsys_storage =
  {"", {FH_PROCSYS}, "", exists};

const device dev_procsysvipc_storage =
  {"", {FH_PROCSYSVIPC}, "", exists};

const device dev_netdrive_storage =
  {"", {FH_NETDRIVE}, "", exists};

const device dev_registry_storage =
  {"", {FH_REGISTRY}, "", exists_internal};

const device dev_piper_storage =
  {"", {FH_PIPER}, "", exists_internal};

const device dev_pipew_storage =
  {"", {FH_PIPEW}, "", exists_internal};

const device dev_tcp_storage =
  {"", {FH_TCP}, "", exists_internal};

const device dev_udp_storage =
  {"", {FH_UDP}, "", exists_internal};

const device dev_stream_storage =
  {"", {FH_STREAM}, "", exists_internal};

const device dev_dgram_storage =
  {"", {FH_DGRAM}, "", exists_internal};

const device dev_bad_storage =
  {"", {FH_NADA}, "", exists_internal};

const device dev_error_storage =
  {"", {FH_ERROR}, "", exists_internal};

#define BRACK(x) {devn_int: x}
%storage_here
}
/* Internal devices below are prefixed with a ":".  This moves them out of
   the POSIX namespace.  */
%%
"/dev", BRACK(FH_DEV), "", exists, S_IFDIR
"/dev/tty", BRACK(FH_TTY), "/dev/tty", exists, S_IFCHR
"/dev/pty%(0-63)d", BRACK(FHDEV(DEV_PTYS_MAJOR, {$1})), "/dev/pty{$1}", exists_pty, S_IFCHR, =ptys_dev
":ptym%(0-63)d", BRACK(FHDEV(DEV_PTYM_MAJOR, {$1})), "/dev/ptym{$1}", exists_internal, S_IFCHR, =ptym_dev
"/dev/cons%(0-63)d", BRACK(FHDEV(DEV_CONS_MAJOR, {$1})), "/dev/cons{$1}", exists_console, S_IFCHR, =cons_dev
"/dev/console", BRACK(FH_CONSOLE), "/dev/console", exists_console, S_IFCHR, =console_dev
"/dev/ptmx", BRACK(FH_PTMX), "/dev/ptmx", exists, S_IFCHR
"/dev/windows", BRACK(FH_WINDOWS), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/dsp", BRACK(FH_OSS_DSP), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/conin", BRACK(FH_CONIN), "/dev/conin", exists_console, S_IFCHR
"/dev/conout", BRACK(FH_CONOUT), "/dev/conout", exists_console, S_IFCHR
"/dev/null", BRACK(FH_NULL), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/zero", BRACK(FH_ZERO), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/full", BRACK(FH_FULL), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/random", BRACK(FH_RANDOM), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/urandom", BRACK(FH_URANDOM), "\\Device\\Null", exists_ntdev, S_IFCHR, =urandom_dev
"/dev/clipboard", BRACK(FH_CLIPBOARD), "\\Device\\Null", exists_ntdev, S_IFCHR
"/dev/com%(1-16)d", BRACK(FHDEV(DEV_SERIAL_MAJOR, {$1 - 1})), "\\??\\COM{$1}", exists_ntdev_silent, S_IFCHR
"/dev/ttyS%(0-63)d", BRACK(FHDEV(DEV_SERIAL_MAJOR, {$1})), "\\??\\COM{$1 + 1}", exists_ntdev, S_IFCHR
":pipe", BRACK(FH_PIPE), "/dev/pipe", exists_internal, S_IFCHR
":fifo", BRACK(FH_FIFO), "/dev/fifo", exists_internal, S_IFCHR
"/dev/st%(0-127)d", BRACK(FHDEV(DEV_TAPE_MAJOR, {$1})), "\\Device\\Tape{$1}", exists_ntdev, S_IFBLK
"/dev/nst%(0-127)d", BRACK(FHDEV(DEV_TAPE_MAJOR, {$1 + 128})), "\\Device\\Tape{$1}", exists_ntdev, S_IFBLK
"/dev/fd%(0-15)d", BRACK(FHDEV(DEV_FLOPPY_MAJOR, {$1})), "\\Device\\Floppy{$1}", exists_ntdev, S_IFBLK
"/dev/scd%(0-15)d", BRACK(FHDEV(DEV_CDROM_MAJOR, {$1})), "\\Device\\CdRom{$1}", exists_ntdev, S_IFBLK
"/dev/sr%(0-15)d", BRACK(FHDEV(DEV_CDROM_MAJOR, {$1})), "\\Device\\CdRom{$1}", exists_ntdev, S_IFBLK
"/dev/sd%{a-z}s", BRACK(FH_SD{uc $1}), "\\Device\\Harddisk{ord($1) - ord('a')}\\Partition0", exists_ntdev, S_IFBLK
"/dev/sda%{a-z}s", BRACK(FH_SDA{uc $1}), "\\Device\\Harddisk{26 + ord($1) - ord('a')}\\Partition0", exists_ntdev, S_IFBLK
"/dev/sdb%{a-z}s", BRACK(FH_SDB{uc $1}), "\\Device\\Harddisk{52 + ord($1) - ord('a')}\\Partition0", exists_ntdev, S_IFBLK
"/dev/sdc%{a-z}s", BRACK(FH_SDC{uc $1}), "\\Device\\Harddisk{78 + ord($1) - ord('a')}\\Partition0", exists_ntdev, S_IFBLK
"/dev/sdd%{a-x}s", BRACK(FH_SDD{uc $1}), "\\Device\\Harddisk{104 + ord($1) - ord('a')}\\Partition0", exists_ntdev, S_IFBLK
"/dev/sd%{a-z}s%(1-15)d", BRACK(FH_SD{uc $1} | {$2}), "\\Device\\Harddisk{ord($1) - ord('a')}\\Partition{$2 % 16}", exists_ntdev, S_IFBLK
"/dev/sda%{a-z}s%(1-15)d", BRACK(FH_SDA{uc $1} | {$2}), "\\Device\\Harddisk{26 + ord($1) - ord('a')}\\Partition{$2 % 16}", exists_ntdev, S_IFBLK
"/dev/sdb%{a-z}s%(1-15)d", BRACK(FH_SDB{uc $1} | {$2}), "\\Device\\Harddisk{52 + ord($1) - ord('a')}\\Partition{$2 % 16}", exists_ntdev, S_IFBLK
"/dev/sdc%{a-z}s%(1-15)d", BRACK(FH_SDC{uc $1} | {$2}), "\\Device\\Harddisk{78 + ord($1) - ord('a')}\\Partition{$2 % 16}", exists_ntdev, S_IFBLK
"/dev/sdd%{a-x}s%(1-15)d", BRACK(FH_SDD{uc $1} | {$2}), "\\Device\\Harddisk{104 + ord($1) - ord('a')}\\Partition{$2 % 16}", exists_ntdev, S_IFBLK
"/dev/kmsg", BRACK(FH_KMSG), "\\Device\\MailSlot\\cygwin\\dev\\kmsg", exists_ntdev, S_IFCHR
%other	{return	NULL;}
%%
#undef BRACK

const device *dev_storage_end = dev_storage + (sizeof dev_storage / sizeof dev_storage[0]);

void
device::parse (const char *s)
{
  size_t len = strlen (s);
  const device *dev = KR_find_keyword (s, len);

  if (!dev)
    *this = *fs_dev;
  else
    *this = *dev;
}

void
device::init ()
{
  /* nothing to do... yet */
}

void
device::parse (_major_t major, _minor_t minor)
{
  dev_t devn = FHDEV (major, minor);

  d.devn = 0;

  for (const device *devidx = dev_storage; devidx < dev_storage_end; devidx++)
    if (devidx->d.devn == devn)
      {
	*this = *devidx;
	break;
      }

  if (!*this)
    d.devn = FHDEV (major, minor);
}

void
device::parse (dev_t dev)
{
  parse (_major (dev), _minor (dev));
}

void
device::parsedisk (int drive, int part)
{
  int base;
  if (drive < ('q' - 'a'))      /* /dev/sda -to- /dev/sdp */
    base = DEV_SD_MAJOR;
  else if (drive < 32)		/* /dev/sdq -to- /dev/sdaf */
    {
      base = DEV_SD1_MAJOR;
      drive -= 'q' - 'a';
    }
  else if (drive < 48)		/* /dev/sdag -to- /dev/sdav */
    {
      base = DEV_SD2_MAJOR;
      drive -= 32;
    }
  else if (drive < 64)		/* /dev/sdaw -to- /dev/sdbl */
    {
      base = DEV_SD3_MAJOR;
      drive -= 48;
    }
  else if (drive < 80)		/* /dev/sdbm -to- /dev/sdcb */
    {
      base = DEV_SD4_MAJOR;
      drive -= 64;
    }
  else if (drive < 96)		/* /dev/sdcc -to- /dev/sdcr */
    {
      base = DEV_SD5_MAJOR;
      drive -= 80;
    }
  else if (drive < 112)		/* /dev/sdcs -to- /dev/sddh */
    {
      base = DEV_SD6_MAJOR;
      drive -= 96;
    }
  /* NOTE: This will cause multiple /dev/sddx entries in
	   /proc/partitions if there are more than 128 devices */
  else				/* /dev/sddi -to- /dev/sddx */
    {
      base = DEV_SD7_MAJOR;
      drive -= 112;
    }
  parse (base, part + (drive * 16));
}