278 lines
5.2 KiB
C++
278 lines
5.2 KiB
C++
/* tty.cc
|
|
|
|
Copyright 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009,
|
|
2010, 2011 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. */
|
|
|
|
#include "winsup.h"
|
|
#include "miscfuncs.h"
|
|
#include <unistd.h>
|
|
#include <utmp.h>
|
|
#include <sys/cygwin.h>
|
|
#include "cygerrno.h"
|
|
#include "security.h"
|
|
#include "path.h"
|
|
#include "fhandler.h"
|
|
#include "dtable.h"
|
|
#include "cygheap.h"
|
|
#include "pinfo.h"
|
|
#include "shared_info.h"
|
|
|
|
HANDLE NO_COPY tty_list::mutex = NULL;
|
|
|
|
extern "C" int
|
|
posix_openpt (int oflags)
|
|
{
|
|
return open ("/dev/ptmx", oflags);
|
|
}
|
|
|
|
extern "C" int
|
|
grantpt (int fd)
|
|
{
|
|
cygheap_fdget cfd (fd);
|
|
return cfd < 0 ? -1 : 0;
|
|
}
|
|
|
|
extern "C" int
|
|
unlockpt (int fd)
|
|
{
|
|
cygheap_fdget cfd (fd);
|
|
return cfd < 0 ? -1 : 0;
|
|
}
|
|
|
|
extern "C" int
|
|
revoke (char *ttyname)
|
|
{
|
|
set_errno (ENOSYS);
|
|
return -1;
|
|
}
|
|
|
|
extern "C" int
|
|
ttyslot (void)
|
|
{
|
|
if (myself->ctty <= 0 || iscons_dev (myself->ctty))
|
|
return -1;
|
|
return device::minor (myself->ctty);
|
|
}
|
|
|
|
void __stdcall
|
|
tty_list::init_session ()
|
|
{
|
|
char mutex_name[MAX_PATH];
|
|
char *name = shared_name (mutex_name, "tty_list::mutex", 0);
|
|
|
|
/* tty_list::mutex is used while searching for a tty slot */
|
|
if (!(mutex = CreateMutex (&sec_all_nih, FALSE, name)))
|
|
api_fatal ("can't create tty_list::mutex '%s', %E", name);
|
|
ProtectHandle (mutex);
|
|
}
|
|
|
|
void __stdcall
|
|
tty::init_session ()
|
|
{
|
|
if (!myself->cygstarted && NOTSTATE (myself, PID_CYGPARENT))
|
|
cygheap->fdtab.get_debugger_info ();
|
|
}
|
|
|
|
int __stdcall
|
|
tty_list::attach (int n)
|
|
{
|
|
int res;
|
|
if (iscons_dev (n))
|
|
res = -1;
|
|
else if (n != -1)
|
|
res = connect (device::minor (n));
|
|
else
|
|
res = -1;
|
|
return res;
|
|
}
|
|
|
|
int
|
|
tty_list::connect (int ttynum)
|
|
{
|
|
if (ttynum < 0 || ttynum >= NTTYS)
|
|
{
|
|
termios_printf ("ttynum (%d) out of range", ttynum);
|
|
return -1;
|
|
}
|
|
if (!ttys[ttynum].exists ())
|
|
{
|
|
termios_printf ("pty %d was not allocated", ttynum);
|
|
set_errno (ENXIO);
|
|
return -1;
|
|
}
|
|
|
|
return ttynum;
|
|
}
|
|
|
|
void
|
|
tty_list::init ()
|
|
{
|
|
for (int i = 0; i < NTTYS; i++)
|
|
{
|
|
ttys[i].init ();
|
|
ttys[i].setntty (DEV_PTYS_MAJOR, i);
|
|
}
|
|
}
|
|
|
|
/* Search for a free tty and allocate it.
|
|
Return tty number or -1 if error.
|
|
*/
|
|
int
|
|
tty_list::allocate (HANDLE& r, HANDLE& w)
|
|
{
|
|
lock_ttys here;
|
|
int freetty = -1;
|
|
|
|
tty *t = NULL;
|
|
for (int i = 0; i < NTTYS; i++)
|
|
if (ttys[i].not_allocated (r, w))
|
|
{
|
|
t = ttys + i;
|
|
t->init ();
|
|
t->setsid (-1);
|
|
freetty = i;
|
|
break;
|
|
}
|
|
|
|
if (freetty >= 0)
|
|
termios_printf ("pty%d allocated", freetty);
|
|
else
|
|
{
|
|
system_printf ("No pty allocated");
|
|
r = w = NULL;
|
|
}
|
|
|
|
return freetty;
|
|
}
|
|
|
|
bool
|
|
tty::not_allocated (HANDLE& r, HANDLE& w)
|
|
{
|
|
/* Attempt to open the from-master side of the tty. If it is accessible
|
|
then it exists although we may not have privileges to actually use it. */
|
|
char pipename[sizeof("ptyNNNN-from-master")];
|
|
__small_sprintf (pipename, "pty%d-from-master", get_unit ());
|
|
/* fhandler_pipe::create returns 0 when creation succeeds */
|
|
return fhandler_pipe::create (&sec_none, &r, &w,
|
|
fhandler_pty_common::pipesize, pipename,
|
|
0) == 0;
|
|
}
|
|
|
|
bool
|
|
tty::exists ()
|
|
{
|
|
HANDLE r, w;
|
|
bool res;
|
|
if (!not_allocated (r, w))
|
|
res = true;
|
|
|
|
else
|
|
{
|
|
/* Handles are left open when not_allocated finds a non-open "tty" */
|
|
CloseHandle (r);
|
|
CloseHandle (w);
|
|
res = false;
|
|
}
|
|
debug_printf ("exists %d", res);
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
tty::slave_alive ()
|
|
{
|
|
HANDLE ev;
|
|
if ((ev = open_inuse (READ_CONTROL)))
|
|
CloseHandle (ev);
|
|
return ev != NULL;
|
|
}
|
|
|
|
HANDLE
|
|
tty::open_mutex (const char *mutex, ACCESS_MASK access)
|
|
{
|
|
char buf[MAX_PATH];
|
|
shared_name (buf, mutex, get_unit ());
|
|
return OpenMutex (access, TRUE, buf);
|
|
}
|
|
|
|
HANDLE
|
|
tty::open_inuse (ACCESS_MASK access)
|
|
{
|
|
char buf[MAX_PATH];
|
|
shared_name (buf, TTY_SLAVE_ALIVE, get_unit ());
|
|
return OpenEvent (access, FALSE, buf);
|
|
}
|
|
|
|
HANDLE
|
|
tty::create_inuse (PSECURITY_ATTRIBUTES sa)
|
|
{
|
|
HANDLE h;
|
|
char buf[MAX_PATH];
|
|
|
|
shared_name (buf, TTY_SLAVE_ALIVE, get_unit ());
|
|
h = CreateEvent (sa, TRUE, FALSE, buf);
|
|
termios_printf ("%s %p", buf, h);
|
|
if (!h)
|
|
termios_printf ("couldn't open inuse event, %E", buf);
|
|
return h;
|
|
}
|
|
|
|
void
|
|
tty::init ()
|
|
{
|
|
output_stopped = 0;
|
|
setsid (0);
|
|
pgid = 0;
|
|
was_opened = false;
|
|
master_pid = 0;
|
|
is_console = false;
|
|
}
|
|
|
|
HANDLE
|
|
tty::get_event (const char *fmt, PSECURITY_ATTRIBUTES sa, BOOL manual_reset)
|
|
{
|
|
HANDLE hev;
|
|
char buf[MAX_PATH];
|
|
|
|
shared_name (buf, fmt, get_unit ());
|
|
if (!sa)
|
|
sa = &sec_all;
|
|
if (!(hev = CreateEvent (sa, manual_reset, FALSE, buf)))
|
|
{
|
|
termios_printf ("couldn't create %s", buf);
|
|
set_errno (ENOENT); /* FIXME this can't be the right errno */
|
|
return NULL;
|
|
}
|
|
|
|
termios_printf ("created event %s", buf);
|
|
return hev;
|
|
}
|
|
|
|
lock_ttys::lock_ttys (DWORD howlong): release_me (true)
|
|
{
|
|
if (WaitForSingleObject (tty_list::mutex, howlong) == WAIT_FAILED)
|
|
{
|
|
termios_printf ("WFSO for mutex %p failed, %E", tty_list::mutex);
|
|
release_me = false;
|
|
}
|
|
}
|
|
|
|
void
|
|
lock_ttys::release ()
|
|
{
|
|
ReleaseMutex (tty_list::mutex);
|
|
}
|
|
|
|
const char *
|
|
tty_min::ttyname ()
|
|
{
|
|
device d;
|
|
d.parse (ntty);
|
|
return d.name;
|
|
}
|