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/* tty.h: shared tty info for cygwin
Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2009, 2010, 2011, 2012, 2013
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 _TTY_H
#define _TTY_H
/* tty tables */
#define INP_BUFFER_SIZE 256
#define OUT_BUFFER_SIZE 256
#define NTTYS 64
#define real_tty_attached(p) ((p)->ctty > 0 && !iscons_dev ((p)->ctty))
/* Input/Output/ioctl events */
#define INPUT_AVAILABLE_EVENT "cygtty.input.avail"
#define OUTPUT_MUTEX "cygtty.output.mutex"
#define INPUT_MUTEX "cygtty.input.mutex"
#define TTY_SLAVE_ALIVE "cygtty.slave_alive"
#include <sys/termios.h>
#ifndef MIN_CTRL_C_SLOP
#define MIN_CTRL_C_SLOP 50
#endif
#include <devices.h>
class tty_min
{
pid_t sid; /* Session ID of tty */
struct status_flags
{
unsigned initialized : 1; /* Set if tty is initialized */
unsigned rstcons : 1; /* Set if console needs to be set to "non-cooked" */
} status;
public:
pid_t pgid;
bool output_stopped; /* FIXME: Maybe do this with a mutex someday? */
fh_devices ntty;
DWORD last_ctrl_c; /* tick count of last ctrl-c */
bool is_console;
IMPLEMENT_STATUS_FLAG (bool, initialized)
IMPLEMENT_STATUS_FLAG (bool, rstcons)
struct termios ti;
struct winsize winsize;
/* ioctl requests buffer */
int cmd;
union
{
struct termios termios;
struct winsize winsize;
int value;
pid_t pid;
} arg;
/* XXX_retval variables holds master's completion codes. Error are stored as
* -ERRNO
*/
int ioctl_retval;
int write_error;
void setntty (_major_t t, _minor_t n) {ntty = (fh_devices) FHDEV (t, n);}
dev_t getntty () const {return ntty;}
_minor_t get_minor () const {return device::minor (ntty);}
pid_t getpgid () const {return pgid;}
void setpgid (int pid) {pgid = pid;}
int getsid () const {return sid;}
void setsid (pid_t tsid) {sid = tsid;}
void kill_pgrp (int);
int is_orphaned_process_group (int);
const __reg1 char *ttyname () __attribute (());
};
class fhandler_pty_master;
class tty: public tty_min
{
HANDLE __reg3 get_event (const char *fmt, PSECURITY_ATTRIBUTES sa,
BOOL manual_reset = FALSE);
public:
pid_t master_pid; /* PID of tty master process */
private:
/* Since tty is shared, the HANDLEs must be 32 and 64 bit clean. The below
code makes sure of that by setting the upper 4 byte of the union to 0
when writing the handle value from a 32 bit process. Fortunately the
actual values are 32 bit on both platforms, so the HANDLES can be
used on both platforms. */
union {
HANDLE _from_master;
LARGE_INTEGER _fm_dummy;
};
union {
HANDLE _to_master;
LARGE_INTEGER _tm_dummy;
};
public:
HANDLE from_master() const { return _from_master; }
HANDLE to_master() const { return _to_master; }
#ifdef __x86_64__
void set_from_master (HANDLE h) { _from_master = h; }
void set_to_master (HANDLE h) { _to_master = h; }
#else
void set_from_master (HANDLE h) { _fm_dummy.HighPart = 0; _from_master = h; }
void set_to_master (HANDLE h) { _tm_dummy.HighPart = 0; _to_master = h; }
#endif
int read_retval;
bool was_opened; /* True if opened at least once. */
void init ();
HANDLE open_inuse (ACCESS_MASK access);
HANDLE create_inuse (PSECURITY_ATTRIBUTES);
bool slave_alive ();
HANDLE open_mutex (const char *mutex, ACCESS_MASK access);
inline HANDLE open_output_mutex (ACCESS_MASK access)
{ return open_mutex (OUTPUT_MUTEX, access); }
inline HANDLE open_input_mutex (ACCESS_MASK access)
{ return open_mutex (INPUT_MUTEX, access); }
bool exists ();
bool not_allocated (HANDLE&, HANDLE&);
void set_master_closed () {master_pid = -1;}
bool is_master_closed () const {return master_pid == -1;}
static void __stdcall create_master (int);
static void __stdcall init_session ();
friend class fhandler_pty_master;
};
class tty_list
{
tty ttys[NTTYS];
static HANDLE mutex;
public:
tty * operator [](int n) {return ttys + device::minor (n);}
int allocate (HANDLE& r, HANDLE& w); /* allocate a pty */
int connect (int);
void init ();
tty_min *get_cttyp ();
int __reg2 attach (int n);
static void __stdcall init_session ();
friend class lock_ttys;
};
class lock_ttys
{
bool release_me;
public:
lock_ttys (DWORD = INFINITE);
static void release ();
void dont_release () {release_me = false;}
~lock_ttys ()
{
if (release_me)
release ();
}
};
extern "C" int ttyslot (void);
#endif /*_TTY_H*/
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