libc/winsup/cygwin/fhandler.h

/* fhandler.h

   Copyright 1996, 1997, 1998, 1999, 2000, 2001 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#ifndef _FHANDLER_H_
#define _FHANDLER_H_

#include <sys/ioctl.h>

/* Classes

  Code is located in fhandler.cc unless another file name is given.

  fhandler_base		  normal I/O

     fhandler_disk_file
     fhandler_serial      Adds vmin and vtime.
     fhandler_dev_null    Not really I/O
     fhandler_dev_zero    Faked

     fhandler_dev_raw     (fhandler_raw.cc)
     fhandler_dev_floppy  (fhandler_floppy.cc)
     fhandler_dev_tape    (fhandler_tape.cc)

     fhandler_pipe
     fhandler_socket      (fhandler_socket.cc)

     fhandler_tty_slave   (tty.cc)
     fhandler_pty_master  (tty.cc)
     fhandler_tty_master  (tty.cc)

     fhandler_console     Out with ansi control. (console.cc)

     fhandler_windows	  Windows messages I/O (fhandler_windows.cc)

     fhandler_dev_random  /dev/[u]random implementation (fhandler_random.cc)

     fhandler_dev_mem     /dev/mem implementation (fhandler_mem.cc)

     fhandler_dev_clipboard	/dev/clipboard implementation (fhandler_clipboard.cc)

     fhandler_proc	  Interesting possibility, not implemented yet
*/

enum
{
  FH_RBINARY	= 0x00001000,	/* binary read mode */
  FH_WBINARY	= 0x00002000,	/* binary write mode */
  FH_CLOEXEC	= 0x00004000,	/* close-on-exec */
  FH_RBINSET	= 0x00008000,	/* binary read mode has been explicitly set */
  FH_WBINSET	= 0x00010000,	/* binary write mode has been explicitly set */
  FH_APPEND	= 0x00020000,	/* always append */
  FH_ASYNC	= 0x00040000,	/* async I/O */
  FH_SIGCLOSE	= 0x00080000,	/* signal handler should close fd on interrupt */

  FH_SYMLINK	= 0x00100000,	/* is a symlink */
  FH_EXECABL	= 0x00200000,	/* file looked like it would run:
				 * ends in .exe or .bat or begins with #! */
  FH_W95LSBUG	= 0x00400000,	/* set when lseek is called as a flag that
				 * _write should check if we've moved beyond
				 * EOF, zero filling if so. */
  FH_NOFRNAME	= 0x00800000,	/* Set if shouldn't free unix_path_name and
				   windows_path_name_ on destruction. */
  FH_NOEINTR	= 0x01000000,	/* Set if I/O should be uninterruptible. */
  FH_FFIXUP	= 0x02000000,	/* Set if need to fixup after fork. */
  FH_LOCAL	= 0x04000000,	/* File is unix domain socket */
  FH_SHUTRD	= 0x08000000,	/* Socket saw a SHUT_RD */
  FH_SHUTWR	= 0x10000000,	/* Socket saw a SHUT_WR */
  FH_ISREMOTE	= 0x10000000,	/* File is on a remote drive */
  FH_DCEXEC	= 0x20000000,	/* Don't care if this is executable */
  FH_HASACLS	= 0x40000000,	/* True if fs of file has ACLS */
  FH_QUERYOPEN	= 0x80000000,	/* open file without requesting either read
				   or write access */

  /* Device flags */

  /* Slow devices */
  FH_CONSOLE = 0x00000001,	/* is a console */
  FH_CONIN   = 0x00000002,	/* console input */
  FH_CONOUT  = 0x00000003,	/* console output */
  FH_TTYM    = 0x00000004,	/* is a tty master */
  FH_TTYS    = 0x00000005,	/* is a tty slave */
  FH_PTYM    = 0x00000006,	/* is a pty master */
  FH_SERIAL  = 0x00000007,	/* is a serial port */
  FH_PIPE    = 0x00000008,	/* is a pipe */
  FH_PIPER   = 0x00000009,	/* read end of a pipe */
  FH_PIPEW   = 0x0000000a,	/* write end of a pipe */
  FH_SOCKET  = 0x0000000b,	/* is a socket */
  FH_WINDOWS = 0x0000000c,	/* is a window */
  FH_SLOW    = 0x00000010,	/* "slow" device if below this */

  /* Fast devices */
  FH_DISK    = 0x00000010,	/* is a disk */
  FH_FLOPPY  = 0x00000011,	/* is a floppy */
  FH_TAPE    = 0x00000012,	/* is a tape */
  FH_NULL    = 0x00000013,	/* is the null device */
  FH_ZERO    = 0x00000014,	/* is the zero device */
  FH_RANDOM  = 0x00000015,	/* is a random device */
  FH_MEM     = 0x00000016,	/* is a mem device */
  FH_CLIPBOARD = 0x00000017, /* is a clipbaord device */
  FH_OSS_DSP = 0x00000018,	/* is a dsp audio device */

  FH_NDEV    = 0x00000019,	/* Maximum number of devices */
  FH_DEVMASK = 0x00000fff,	/* devices live here */
  FH_BAD     = 0xffffffff
};

#define FHDEVN(n)	((n) & FH_DEVMASK)
#define FHISSETF(x)	__ISSETF (this, x, FH)
#define FHSETF(x)	__SETF (this, x, FH)
#define FHCLEARF(x)	__CLEARF (this, x, FH)
#define FHCONDSETF(n, x) __CONDSETF(n, this, x, FH)

#define FHSTATOFF	0

/* fcntl flags used only internaly. */
#define O_NOSYMLINK 0x080000
#define O_DIROPEN   0x100000

/* newlib used to define O_NDELAY differently from O_NONBLOCK.  Now it
   properly defines both to be the same.  Unfortunately, we have to
   behave properly the old version, too, to accomodate older executables. */
#define OLD_O_NDELAY	(CYGWIN_VERSION_CHECK_FOR_OLD_O_NONBLOCK ? 4 : 0)

/* Care for the old O_NDELAY flag. If one of the flags is set,
   both flags are set. */
#define O_NONBLOCK_MASK (O_NONBLOCK | OLD_O_NDELAY)

extern const char *windows_device_names[];
extern struct __cygwin_perfile *perfile_table;
#define __fmode (*(user_data->fmode_ptr))

class select_record;
class path_conv;
class fhandler_disk_file;

enum bg_check_types
{
  bg_error = -1,
  bg_eof = 0,
  bg_ok = 1,
  bg_signalled = 2
};

enum executable_states
{
  is_executable,
  not_executable,
  dont_care_if_executable,
  dont_know_if_executable
};

class fhandler_base
{
protected:
  DWORD status;
public:
  int cb;
private:
  int access;
  HANDLE io_handle;

  unsigned long namehash;	/* hashed filename, used as inode num */

protected:
  /* Full unix path name of this file */
  /* File open flags from open () and fcntl () calls */
  int openflags;

  char *rabuf;		/* used for crlf conversion in text files */
  size_t ralen;
  size_t raixget;
  size_t raixput;
  size_t rabuflen;

  char *unix_path_name;
  char *win32_path_name;
  DWORD open_status;

public:
  void set_name (const char * unix_path, const char * win32_path = NULL,
		 int unit = 0);

  virtual fhandler_base& operator =(fhandler_base &x);
  fhandler_base (DWORD dev, const char *name = 0, int unit = 0);
  virtual ~fhandler_base ();

  /* Non-virtual simple accessor functions. */
  void set_io_handle (HANDLE x) { io_handle = x; }

  void set_cb (size_t size) { cb = size; }
  DWORD get_device () { return status & FH_DEVMASK; }
  virtual int get_unit () { return 0; }
  virtual BOOL is_slow () { return get_device () < FH_SLOW; }

  int get_access () { return access; }
  void set_access (int x) { access = x; }

  int get_async () { return FHISSETF (ASYNC); }
  void set_async (int x) { FHCONDSETF (x, ASYNC); }

  int get_flags () { return openflags; }
  void set_flags (int x) { openflags = x; }

  int is_nonblocking ();
  void set_nonblocking (int yes);

  int get_w_binary () { return FHISSETF (WBINARY); }
  int get_r_binary () { return FHISSETF (RBINARY); }

  int get_w_binset () { return FHISSETF (WBINSET); }
  int get_r_binset () { return FHISSETF (RBINSET); }

  void set_w_binary (int b) { FHCONDSETF (b, WBINARY); FHSETF (WBINSET); }
  void set_r_binary (int b) { FHCONDSETF (b, RBINARY); FHSETF (RBINSET); }
  void clear_w_binary () {FHCLEARF (WBINARY); FHCLEARF (WBINSET); }
  void clear_r_binary () {FHCLEARF (RBINARY); FHCLEARF (RBINSET); }
  void set_open_status () {open_status = status;}
  DWORD get_open_status () {return open_status;}
  void reset_to_open_binmode ()
  {
    status = status & ~(FH_WBINARY | FH_WBINSET | FH_RBINARY | FH_RBINSET);
    status = status | ((FH_WBINARY | FH_WBINSET | FH_RBINARY | FH_RBINSET)
		       & open_status);
  }

  int get_default_fmode (int flags);

  int get_r_no_interrupt () { return FHISSETF (NOEINTR); }
  void set_r_no_interrupt (int b) { FHCONDSETF (b, NOEINTR); }

  int get_close_on_exec () { return FHISSETF (CLOEXEC); }
  int set_close_on_exec_flag (int b) { return FHCONDSETF (b, CLOEXEC); }

  LPSECURITY_ATTRIBUTES get_inheritance (bool all = 0)
  {
    if (all)
      return get_close_on_exec () ? &sec_all_nih : &sec_all;
    else
      return get_close_on_exec () ? &sec_none_nih : &sec_none;
  }

  void set_check_win95_lseek_bug (int b = 1) { FHCONDSETF (b, W95LSBUG); }
  int get_check_win95_lseek_bug () { return FHISSETF (W95LSBUG); }

  int get_need_fork_fixup () { return FHISSETF (FFIXUP); }
  void set_need_fork_fixup () { FHSETF (FFIXUP); }

  virtual void set_close_on_exec (int val);

  virtual void fixup_before_fork_exec (DWORD) {}
  virtual void fixup_after_fork (HANDLE);
  virtual void fixup_after_exec (HANDLE) {}

  int get_symlink_p () { return FHISSETF (SYMLINK); }
  void set_symlink_p (int val) { FHCONDSETF (val, SYMLINK); }
  void set_symlink_p () { FHSETF (SYMLINK); }

  int get_socket_p () { return FHISSETF (LOCAL); }
  void set_socket_p (int val) { FHCONDSETF (val, LOCAL); }
  void set_socket_p () { FHSETF (LOCAL); }

  int get_execable_p () { return FHISSETF (EXECABL); }
  void set_execable_p (executable_states val)
  {
    FHCONDSETF (val == is_executable, EXECABL);
    FHCONDSETF (val == dont_care_if_executable, DCEXEC);
  }
  void set_execable_p () { FHSETF (EXECABL); }
  int dont_care_if_execable () { return FHISSETF (DCEXEC); }

  int get_append_p () { return FHISSETF (APPEND); }
  void set_append_p (int val) { FHCONDSETF (val, APPEND); }
  void set_append_p () { FHSETF (APPEND); }

  int get_query_open () { return FHISSETF (QUERYOPEN); }
  void set_query_open (int val) { FHCONDSETF (val, QUERYOPEN); }

  int get_readahead_valid () { return raixget < ralen; }
  int puts_readahead (const char *s, size_t len = (size_t) -1);
  int put_readahead (char value);

  int get_readahead ();
  int peek_readahead (int queryput = 0);

  int eat_readahead (int n);

  void set_readahead_valid (int val, int ch = -1);

  int get_readahead_into_buffer (char *buf, size_t buflen);

  int has_acls () { return FHISSETF (HASACLS); }
  void set_has_acls (int val) { FHCONDSETF (val, HASACLS); }

  int isremote () { return FHISSETF (ISREMOTE); }
  void set_isremote (int val) { FHCONDSETF (val, ISREMOTE); }

  int no_free_names () { return FHISSETF (NOFRNAME); }
  void set_no_free_names (int val) { FHCONDSETF (val, NOFRNAME); }
  void set_no_free_names () { FHSETF (NOFRNAME); }

  const char *get_name () { return unix_path_name; }
  const char *get_win32_name () { return win32_path_name; }
  unsigned long get_namehash () { return namehash; }

  virtual void hclose (HANDLE h) {CloseHandle (h);}
  virtual void set_inheritance (HANDLE &h, int not_inheriting);

  /* fixup fd possibly non-inherited handles after fork */
  void fork_fixup (HANDLE parent, HANDLE &h, const char *name);

  /* Potentially overridden virtual functions. */
  virtual int open (const char *, int flags, mode_t mode = 0)
  {
    return open (flags, mode);
  }
  virtual int open (path_conv& real_path, int flags, mode_t mode);
  virtual int open (int flags, mode_t mode = 0);
  virtual int close ();
  virtual int fstat (struct stat *buf) { return stat_dev (get_device (), get_unit (), get_namehash (), buf); }
  virtual int ioctl (unsigned int cmd, void *);
  virtual int fcntl (int cmd, void *);
  virtual char const * ttyname () { return get_name(); }
  virtual int read (void *ptr, size_t len);
  virtual int write (const void *ptr, size_t len);
  virtual off_t lseek (off_t offset, int whence);
  virtual int lock (int, struct flock *);
  virtual void dump ();
  virtual int dup (fhandler_base *child);

  virtual HANDLE mmap (caddr_t *addr, size_t len, DWORD access,
		       int flags, off_t off);
  virtual int munmap (HANDLE h, caddr_t addr, size_t len);
  virtual int msync (HANDLE h, caddr_t addr, size_t len, int flags);
  virtual BOOL fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
				      DWORD size, void *address);

  void *operator new (size_t, void *p) {return p;}

  virtual void init (HANDLE, DWORD, mode_t);

  virtual int tcflush (int);
  virtual int tcsendbreak (int);
  virtual int tcdrain ();
  virtual int tcflow (int);
  virtual int tcsetattr (int a, const struct termios *t);
  virtual int tcgetattr (struct termios *t);
  virtual int tcsetpgrp (const pid_t pid);
  virtual int tcgetpgrp ();
  virtual int is_tty () { return 0; }
  virtual BOOL is_device () { return TRUE; }
  virtual char *ptsname () { return NULL;}
  virtual class fhandler_socket *is_socket () { return 0; }
  virtual class fhandler_console *is_console () { return 0; }
  virtual int is_windows () {return 0; }

  virtual int raw_read (void *ptr, size_t ulen);
  virtual int raw_write (const void *ptr, size_t ulen);

  /* Virtual accessor functions to hide the fact
     that some fd's have two handles. */
  virtual HANDLE& get_handle () { return io_handle; }
  virtual HANDLE& get_io_handle () { return io_handle; }
  virtual HANDLE& get_output_handle () { return io_handle; }
  virtual BOOL hit_eof () {return FALSE;}
  virtual select_record *select_read (select_record *s);
  virtual select_record *select_write (select_record *s);
  virtual select_record *select_except (select_record *s);
  virtual int ready_for_read (int fd, DWORD howlong, int ignra);
  virtual const char * get_native_name ()
  {
    return windows_device_names[FHDEVN (status)];
  }
  virtual bg_check_types bg_check (int) {return bg_ok;}
  void clear_readahead ()
  {
    raixput = raixget = ralen = rabuflen = 0;
    rabuf = NULL;
  }
  void operator delete (void *);
};

class fhandler_socket: public fhandler_base
{
private:
  int addr_family;
  int connect_secret [4];
  HANDLE secret_event;
  struct _WSAPROTOCOL_INFOA *prot_info_ptr;

public:
  fhandler_socket (const char *name = 0);
  ~fhandler_socket ();
  int get_socket () { return (int) get_handle(); }
  fhandler_socket * is_socket () { return this; }

  bool saw_shutdown_read () const {return FHISSETF (SHUTRD);}
  bool saw_shutdown_write () const {return FHISSETF (SHUTWR);}

  void set_shutdown_read () {FHSETF (SHUTRD);}
  void set_shutdown_write () {FHSETF (SHUTWR);}

  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  int ioctl (unsigned int cmd, void *);
  int fcntl (int cmd, void *);
  off_t lseek (off_t, int) { return 0; }
  int close ();
  void hclose (HANDLE) {close ();}
  int dup (fhandler_base *child);

  void set_close_on_exec (int val);
  virtual void fixup_before_fork_exec (DWORD);
  void fixup_after_fork (HANDLE);
  void fixup_after_exec (HANDLE);

  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
  int get_addr_family () {return addr_family;}
  void set_addr_family (int af) {addr_family = af;}
  void set_connect_secret ();
  void get_connect_secret (char*);
  HANDLE create_secret_event (int *secret = NULL);
  int check_peer_secret_event (struct sockaddr_in *peer, int *secret = NULL);
  void signal_secret_event ();
  void close_secret_event ();
};

class fhandler_pipe: public fhandler_base
{
  HANDLE guard;
public:
  fhandler_pipe (const char *name = 0, DWORD devtype = FH_PIPE);
  off_t lseek (off_t offset, int whence);
  BOOL is_slow () {return !wincap.has_unreliable_pipes ();}
  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
  void set_close_on_exec (int val);
  int read (void *ptr, size_t len);
  int close ();
  void create_guard (SECURITY_ATTRIBUTES *sa) {guard = CreateMutex (sa, FALSE, NULL);}
  int dup (fhandler_base *child);
};

class fhandler_dev_raw: public fhandler_base
{
protected:
  char *devbuf;
  size_t devbufsiz;
  size_t devbufstart;
  size_t devbufend;
  int eom_detected    : 1;
  int eof_detected    : 1;
  int lastblk_to_read : 1;
  int is_writing      : 1;
  int has_written     : 1;
  int varblkop	      : 1;
  int unit;

  virtual void clear (void);
  virtual int writebuf (void);

  /* returns not null, if `win_error' determines an end of media condition */
  virtual int is_eom(int win_error) = 0;
  /* returns not null, if `win_error' determines an end of file condition */
  virtual int is_eof(int win_error) = 0;

  fhandler_dev_raw (DWORD dev, const char *name, int unit);

public:
  ~fhandler_dev_raw (void);

  int open (const char *path, int flags, mode_t mode = 0);
  int close (void);

  int raw_read (void *ptr, size_t ulen);
  int raw_write (const void *ptr, size_t ulen);

  int fstat (struct stat *buf);

  int dup (fhandler_base *child);

  int ioctl (unsigned int cmd, void *buf);

  void fixup_after_fork (HANDLE);
  void fixup_after_exec (HANDLE);
};

class fhandler_dev_floppy: public fhandler_dev_raw
{
protected:
  virtual int is_eom (int win_error);
  virtual int is_eof (int win_error);

public:
  fhandler_dev_floppy (const char *name, int unit);

  virtual int open (const char *path, int flags, mode_t mode = 0);
  virtual int close (void);

  virtual off_t lseek (off_t offset, int whence);

  virtual int ioctl (unsigned int cmd, void *buf);
};

class fhandler_dev_tape: public fhandler_dev_raw
{
  int norewind;
  int lasterr;

protected:
  virtual void clear (void);

  virtual int is_eom (int win_error);
  virtual int is_eof (int win_error);

public:
  fhandler_dev_tape (const char *name, int unit);

  virtual int open (const char *path, int flags, mode_t mode = 0);
  virtual int close (void);

  virtual off_t lseek (off_t offset, int whence);

  virtual int fstat (struct stat *buf);

  virtual int dup (fhandler_base *child);

  virtual int ioctl (unsigned int cmd, void *buf);

private:
  int tape_write_marks (int marktype, DWORD len);
  int tape_get_pos (unsigned long *ret);
  int tape_set_pos (int mode, long count, BOOLEAN sfm_func = FALSE);
  int tape_erase (int mode);
  int tape_prepare (int action);
  BOOLEAN tape_get_feature (DWORD parm);
  int tape_get_blocksize (long *min, long *def, long *max, long *cur);
  int tape_set_blocksize (long count);
  int tape_status (struct mtget *get);
  int tape_compression (long count);
};

/* Standard disk file */

class fhandler_disk_file: public fhandler_base
{
public:
  fhandler_disk_file (const char *name);

  int open (const char *path, int flags, mode_t mode = 0);
  int open (path_conv& real_path, int flags, mode_t mode);
  int close ();
  int lock (int, struct flock *);
  BOOL is_device () { return FALSE; }
  int fstat (struct stat *buf);

  HANDLE mmap (caddr_t *addr, size_t len, DWORD access, int flags, off_t off);
  int munmap (HANDLE h, caddr_t addr, size_t len);
  int msync (HANDLE h, caddr_t addr, size_t len, int flags);
  BOOL fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
			      DWORD size, void *address);
};

class fhandler_serial: public fhandler_base
{
private:
  unsigned int vmin_;			/* from termios */
  unsigned int vtime_;			/* from termios */
  pid_t pgrp_;

public:
  int overlapped_armed;
  OVERLAPPED io_status;

  /* Constructor */
  fhandler_serial (const char *name, DWORD devtype = FH_SERIAL, int unit = 0);

  int open (const char *path, int flags, mode_t mode);
  int close ();
  void init (HANDLE h, DWORD a, mode_t flags);
  void overlapped_setup ();
  int dup (fhandler_base *child);
  int raw_read (void *ptr, size_t ulen);
  int raw_write (const void *ptr, size_t ulen);
  int tcsendbreak (int);
  int tcdrain ();
  int tcflow (int);
  int tcsetattr (int a, const struct termios *t);
  int tcgetattr (struct termios *t);
  off_t lseek (off_t, int) { return 0; }
  int tcflush (int);
  void dump ();
  int is_tty () { return 1; }
  void fixup_after_fork (HANDLE parent);
  void fixup_after_exec (HANDLE);

  /* We maintain a pgrp so that tcsetpgrp and tcgetpgrp work, but we
     don't use it for permissions checking.  fhandler_tty_slave does
     permission checking on pgrps.  */
  virtual int tcgetpgrp () { return pgrp_; }
  virtual int tcsetpgrp (const pid_t pid) { pgrp_ = pid; return 0; }
  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
};

#define acquire_output_mutex(ms) \
  __acquire_output_mutex (__PRETTY_FUNCTION__, __LINE__, ms);

#define release_output_mutex() \
  __release_output_mutex (__PRETTY_FUNCTION__, __LINE__);

class tty;
class tty_min;
class fhandler_termios: public fhandler_base
{
protected:
  HANDLE output_handle;
  virtual void doecho (const void *, DWORD) {};
  virtual int accept_input () {return 1;};
public:
  tty_min *tc;
  fhandler_termios (DWORD dev, const char *name = 0, int unit = 0) :
  fhandler_base (dev, name, unit)
  {
    set_need_fork_fixup ();
  }
  HANDLE& get_output_handle () { return output_handle; }
  int line_edit (const char *rptr, int nread, int always_accept = 0);
  void set_output_handle (HANDLE h) { output_handle = h; }
  void tcinit (tty_min *this_tc, int force = FALSE);
  virtual int is_tty () { return 1; }
  int tcgetpgrp ();
  int tcsetpgrp (int pid);
  bg_check_types bg_check (int sig);
  virtual DWORD __acquire_output_mutex (const char *fn, int ln, DWORD ms) {return 1;}
  virtual void __release_output_mutex (const char *fn, int ln) {}
  void fixup_after_fork (HANDLE);
  void fixup_after_exec (HANDLE parent) { fixup_after_fork (parent); }
  void echo_erase (int force = 0);
};

enum ansi_intensity
{
  INTENSITY_INVISIBLE,
  INTENSITY_DIM,
  INTENSITY_NORMAL,
  INTENSITY_BOLD
};

#define normal 1
#define gotesc 2
#define gotsquare 3
#define gotarg1 4
#define gotrsquare 5
#define gotcommand 6
#define gettitle 7
#define eattitle 8
#define MAXARGS 10

/* This is a input and output console handle */
class fhandler_console: public fhandler_termios
{
private:

  WORD default_color, underline_color, dim_color;

  /* Used to determine if an input keystroke should be modified with META. */
  int meta_mask;

/* Output state */
  int state_;
  int args_[MAXARGS];
  int nargs_;
  unsigned rarg;
  BOOL saw_question_mark;

  char my_title_buf [TITLESIZE + 1];

  WORD current_win32_attr;
  ansi_intensity intensity;
  BOOL underline, blink, reverse;
  WORD fg, bg;

  /* saved cursor coordinates */
  int savex, savey;

  /* saved screen */
  COORD savebufsiz;
  PCHAR_INFO savebuf;

  struct
    {
      short Top, Bottom;
    } scroll_region;
  struct
    {
      SHORT winTop;
      SHORT winBottom;
      COORD dwWinSize;
      COORD dwBufferSize;
      COORD dwCursorPosition;
      WORD wAttributes;
    } info;

  COORD dwLastCursorPosition;
  DWORD dwLastButtonState;
  int nModifiers;

  BOOL insert_mode;
  BOOL use_mouse;
  BOOL raw_win32_keyboard_mode;

/* Output calls */
  void set_default_attr ();
  WORD get_win32_attr ();

  BOOL fillin_info ();
  void clear_screen (int, int, int, int);
  void scroll_screen (int, int, int, int, int, int);
  void cursor_set (BOOL, int, int);
  void cursor_get (int *, int *);
  void cursor_rel (int, int);
  const unsigned char * write_normal (unsigned const char*, unsigned const char *);
  void char_command (char);
  BOOL set_raw_win32_keyboard_mode (BOOL);
  int output_tcsetattr (int a, const struct termios *t);

/* Input calls */
  int igncr_enabled ();
  int input_tcsetattr (int a, const struct termios *t);
  void set_cursor_maybe ();

public:

  fhandler_console (const char *name);

  fhandler_console* is_console () { return this; }

  int open (const char *path, int flags, mode_t mode = 0);

  int write (const void *ptr, size_t len);
  void doecho (const void *str, DWORD len) { (void) write (str, len); }
  int read (void *ptr, size_t len);
  int close ();

  int tcflush (int);
  int tcsetattr (int a, const struct termios *t);
  int tcgetattr (struct termios *t);

  /* Special dup as we must dup two handles */
  int dup (fhandler_base *child);

  int ioctl (unsigned int cmd, void *);
  void init (HANDLE, DWORD, mode_t);
  bool mouse_aware () {return use_mouse;}

  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
  void fixup_after_exec (HANDLE);
  void set_close_on_exec (int val);
  void fixup_after_fork (HANDLE parent);
  void set_input_state ();
};

class fhandler_tty_common: public fhandler_termios
{
public:
  fhandler_tty_common (DWORD dev, const char *name = 0, int unit = 0) :
    fhandler_termios (dev, name, unit),
    ttynum (unit)
  {
    // nothing to do
  }
  HANDLE output_done_event;	// Raised by master when tty's output buffer
				// written. Write status in tty::write_retval.
  HANDLE ioctl_request_event;	// Raised by slave to perform ioctl() request.
				// Ioctl() request in tty::cmd/arg.
  HANDLE ioctl_done_event;	// Raised by master on ioctl() completion.
				// Ioctl() status in tty::ioctl_retval.
  HANDLE output_mutex, input_mutex;
  HANDLE input_available_event;
  HANDLE inuse;			// used to indicate that a tty is in use


  DWORD __acquire_output_mutex (const char *fn, int ln, DWORD ms);
  void __release_output_mutex (const char *fn, int ln);

  int ttynum;			// Master tty num.
  virtual int dup (fhandler_base *child);

  tty *get_ttyp () { return (tty *)tc; }
  int get_unit () { return ttynum; }

  int close ();
  void set_close_on_exec (int val);
  void fixup_after_fork (HANDLE parent);
  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
};

class fhandler_tty_slave: public fhandler_tty_common
{
public:
  /* Constructor */
  fhandler_tty_slave (const char *name);
  fhandler_tty_slave (int, const char *name);

  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  void init (HANDLE, DWORD, mode_t);

  int tcsetattr (int a, const struct termios *t);
  int tcgetattr (struct termios *t);
  int tcflush (int);
  int ioctl (unsigned int cmd, void *);

  off_t lseek (off_t, int) { return 0; }
  select_record *select_read (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
};

class fhandler_pty_master: public fhandler_tty_common
{
  int pktmode;			// non-zero if pty in a packet mode.
public:
  int need_nl;			// Next read should start with \n

  /* Constructor */
  fhandler_pty_master (const char *name, DWORD devtype = FH_PTYM, int unit = -1);

  int process_slave_output (char *buf, size_t len, int pktmode_on);
  void doecho (const void *str, DWORD len);
  int accept_input ();
  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  int close ();

  int tcsetattr (int a, const struct termios *t);
  int tcgetattr (struct termios *t);
  int tcflush (int);
  int ioctl (unsigned int cmd, void *);

  off_t lseek (off_t, int) { return 0; }
  char *ptsname ();

  void set_close_on_exec (int val);
  BOOL hit_eof ();
};

class fhandler_tty_master: public fhandler_pty_master
{
public:
  /* Constructor */
  fhandler_tty_master (const char *name, int unit);
  fhandler_console *console;	// device handler to perform real i/o.
  HANDLE hThread;		// process_output thread handle.

  int init (int);
  int init_console ();
  void fixup_after_fork (HANDLE parent);
  void fixup_after_exec (HANDLE);
};

class fhandler_dev_null: public fhandler_base
{
public:
  fhandler_dev_null (const char *name);

  void dump ();
  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
};

class fhandler_dev_zero: public fhandler_base
{
public:
  fhandler_dev_zero (const char *name);
  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  off_t lseek (off_t offset, int whence);
  int close (void);

  void dump ();
};

class fhandler_dev_random: public fhandler_base
{
protected:
  int unit;
  HCRYPTPROV crypt_prov;
  long pseudo;

  BOOL crypt_gen_random (void *ptr, size_t len);
  int pseudo_write (const void *ptr, size_t len);
  int pseudo_read (void *ptr, size_t len);

public:
  fhandler_dev_random (const char *name, int unit);
  int get_unit () { return unit; }
  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  off_t lseek (off_t offset, int whence);
  int close (void);
  int dup (fhandler_base *child);

  void dump ();
};

class fhandler_dev_mem: public fhandler_base
{
protected:
  int unit;
  DWORD mem_size;
  DWORD pos;

public:
  fhandler_dev_mem (const char *name, int unit);
  ~fhandler_dev_mem (void);

  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t ulen);
  int read (void *ptr, size_t ulen);
  off_t lseek (off_t offset, int whence);
  int close (void);
  int fstat (struct stat *buf);
  int dup (fhandler_base *child);

  HANDLE mmap (caddr_t *addr, size_t len, DWORD access, int flags, off_t off);
  int munmap (HANDLE h, caddr_t addr, size_t len);
  int msync (HANDLE h, caddr_t addr, size_t len, int flags);
  BOOL fixup_mmap_after_fork (HANDLE h, DWORD access, DWORD offset,
			      DWORD size, void *address);

  void dump ();
} ;

class fhandler_dev_clipboard: public fhandler_base
{
public:
  fhandler_dev_clipboard (const char *name);
  int is_windows (void) { return 1; }
  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  off_t lseek (off_t offset, int whence);
  int close (void);

  int dup (fhandler_base *child);

  void dump ();

private:
  off_t pos;
  void *membuffer;
  size_t msize;
  BOOL eof;
};

class fhandler_windows: public fhandler_base
{
private:
  HWND hWnd_;	// the window whose messages are to be retrieved by read() call
  int method_;  // write method (Post or Send)
public:
  fhandler_windows (const char *name = 0);
  int is_windows (void) { return 1; }
  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  int ioctl (unsigned int cmd, void *);
  off_t lseek (off_t, int) { return 0; }
  int close (void) { return 0; }

  void set_close_on_exec (int val);
  void fixup_after_fork (HANDLE parent);
  select_record *select_read (select_record *s);
  select_record *select_write (select_record *s);
  select_record *select_except (select_record *s);
  int ready_for_read (int fd, DWORD howlong, int ignra);
};

class fhandler_dev_dsp : public fhandler_base
{
private:
  int audioformat_;
  int audiofreq_;
  int audiobits_;
  int audiochannels_;
  bool setupwav(const char *pData, int nBytes);
public:
  fhandler_dev_dsp (const char *name = 0);
  ~fhandler_dev_dsp();

  int open (const char *path, int flags, mode_t mode = 0);
  int write (const void *ptr, size_t len);
  int read (void *ptr, size_t len);
  int ioctl (unsigned int cmd, void *);
  off_t lseek (off_t, int);
  int close (void);
  int dup (fhandler_base * child);
  void dump (void);
  void fixup_after_exec (HANDLE);
};

#if 0
/* You can't do this */
typedef union
{
  fhandler_normal normal;
  fhandler_dev_null dev_null;
  fhandler bare;
  fhandler_serial tty;
} fhandler_union;
#else
#define fhandler_union fhandler_console
#endif
struct select_record
{
  int fd;
  HANDLE h;
  fhandler_base *fh;
  BOOL saw_error;
  BOOL windows_handle;
  BOOL read_ready, write_ready, except_ready;
  BOOL read_selected, write_selected, except_selected;
  int (*startup) (select_record *me, class select_stuff *stuff);
  int (*poll) (select_record *me, fd_set *readfds, fd_set *writefds,
	       fd_set *exceptfds);
  int (*verify) (select_record *me, fd_set *readfds, fd_set *writefds,
		 fd_set *exceptfds);
  void (*cleanup) (select_record *me, class select_stuff *stuff);
  struct select_record *next;

  select_record (fhandler_base *in_fh = NULL) : fd (0), h (NULL),
		 fh (in_fh), saw_error (0), windows_handle (0),
		 read_ready (0), write_ready (0), except_ready (0),
		 read_selected (0), write_selected (0), except_selected (0),
		 startup (NULL), poll (NULL), verify (NULL), cleanup (NULL),
		 next (NULL) {}
};

class select_stuff
{
public:
  ~select_stuff ();
  select_stuff (): always_ready (0), windows_used (0), start (0)
  {
    memset (device_specific, 0, sizeof (device_specific));
  }
  BOOL always_ready, windows_used;
  select_record start;
  void *device_specific[FH_NDEV];

  int test_and_set (int i, fd_set *readfds, fd_set *writefds,
		     fd_set *exceptfds);
  int poll (fd_set *readfds, fd_set *writefds, fd_set *exceptfds);
  int wait (fd_set *readfds, fd_set *writefds, fd_set *exceptfds, DWORD ms);
  void cleanup ();
};

int __stdcall set_console_state_for_spawn ();

#endif /* _FHANDLER_H_ */