newlib/winsup/cygwin/tty.cc

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2000-02-17 20:38:33 +01:00
/* tty.cc
Copyright 1997, 1998, 2000 Cygnus Solutions.
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"
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#include <errno.h>
#include <unistd.h>
#include <utmp.h>
#include <wingdi.h>
#include <winuser.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "fhandler.h"
#include "dtable.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "shared_info.h"
#include "security.h"
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extern fhandler_tty_master *tty_master;
extern "C"
int
grantpt (void)
{
return 0;
}
extern "C"
int
unlockpt (void)
{
return 0;
}
extern "C"
int
ttyslot (void)
{
if (NOTSTATE (myself, PID_USETTY))
return -1;
return myself->ctty;
}
void __stdcall
tty_init (void)
{
if (NOTSTATE (myself, PID_USETTY))
return;
if (myself->ctty == -1)
if (NOTSTATE (myself, PID_CYGPARENT))
myself->ctty = attach_tty (myself->ctty);
else
return;
if (myself->ctty == -1)
termios_printf ("Can't attach to tty");
}
/* Create session's master tty */
void __stdcall
create_tty_master (int ttynum)
{
tty_master = (fhandler_tty_master *) fdtab.build_fhandler (-1, FH_TTYM,
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"/dev/ttym", ttynum);
if (tty_master->init (ttynum))
api_fatal ("Can't create master tty");
else
{
/* Log utmp entry */
struct utmp our_utmp;
bzero ((char *) &our_utmp, sizeof (utmp));
(void) time (&our_utmp.ut_time);
strncpy (our_utmp.ut_name, getlogin (), sizeof (our_utmp.ut_name));
cygwin_gethostname (our_utmp.ut_host, sizeof (our_utmp.ut_host));
__small_sprintf (our_utmp.ut_line, "tty%d", ttynum);
our_utmp.ut_type = USER_PROCESS;
myself->ctty = ttynum;
login (&our_utmp);
}
}
void __stdcall
tty_terminate (void)
{
if (NOTSTATE (myself, PID_USETTY))
return;
cygwin_shared->tty.terminate ();
}
int __stdcall
attach_tty (int num)
{
if (num != -1)
{
return cygwin_shared->tty.connect_tty (num);
}
if (NOTSTATE (myself, PID_USETTY))
return -1;
return cygwin_shared->tty.allocate_tty (1);
}
void
tty_list::terminate (void)
{
int ttynum = myself->ctty;
/* Keep master running till there are connected clients */
if (ttynum != -1 && ttys[ttynum].master_pid == GetCurrentProcessId ())
{
tty *t = ttys + ttynum;
CloseHandle (t->from_master);
CloseHandle (t->to_master);
/* Wait for children which rely on tty handling in this process to
go away */
for (int i = 0; ; i++)
{
if (!t->slave_alive ())
break;
if (i >= 100)
{
small_printf ("waiting for children using tty%d to terminate\n",
ttynum);
i = 0;
}
Sleep (200);
}
termios_printf ("tty %d master about to finish", ttynum);
CloseHandle (t->to_slave);
CloseHandle (t->from_slave);
WaitForSingleObject (tty_master->hThread, INFINITE);
t->init ();
char buf[20];
__small_sprintf (buf, "tty%d", ttynum);
logout (buf);
}
}
int
tty_list::connect_tty (int ttynum)
{
if (ttynum < 0 || ttynum >= NTTYS)
{
termios_printf ("ttynum (%d) out of range", ttynum);
return -1;
}
if (!ttys[ttynum].exists ())
{
termios_printf ("tty %d was not allocated", ttynum);
return -1;
}
return ttynum;
}
void
tty_list::init (void)
{
for (int i = 0; i < NTTYS; i++)
{
ttys[i].init ();
ttys[i].setntty (i);
}
}
/* Search for tty class for our console. Allocate new tty if our process is
the only cygwin process in the current console.
Return tty number or -1 if error.
If flag == 0, just find a free tty.
*/
int
tty_list::allocate_tty (int with_console)
{
HWND console;
/* FIXME: This whole function needs a protective mutex. */
if (!with_console)
console = NULL;
else
{
char *oldtitle = new char [TITLESIZE];
if (!oldtitle)
{
termios_printf ("Can't *allocate console title buffer");
return -1;
}
if (!GetConsoleTitle (oldtitle, TITLESIZE))
{
termios_printf ("Can't read console title");
return -1;
}
if (WaitForSingleObject (title_mutex, INFINITE) == WAIT_FAILED)
termios_printf ("WFSO for title_mutext %p failed, %E", title_mutex);
char buf[40];
__small_sprintf (buf, "cygwin.find.console.%d", myself->pid);
SetConsoleTitle (buf);
Sleep (40);
console = FindWindow (NULL, buf);
SetConsoleTitle (oldtitle);
Sleep (40);
ReleaseMutex (title_mutex);
if (console == NULL)
{
termios_printf ("Can't find console window");
return -1;
}
}
/* Is a tty allocated for console? */
int freetty = -1;
for (int i = 0; i < NTTYS; i++)
{
if (!ttys[i].exists ())
{
if (freetty < 0) /* Scanning? */
freetty = i; /* Yes. */
if (!with_console) /* Do we want to attach this to a console? */
break; /* No. We've got one. */
}
if (with_console && ttys[i].gethwnd () == console)
{
termios_printf ("console %x already associated with tty%d",
console, i);
/* Is the master alive? */
HANDLE hMaster;
hMaster = OpenProcess (PROCESS_DUP_HANDLE, FALSE, ttys[i].master_pid);
if (hMaster)
{
CloseHandle (hMaster);
return i;
}
/* Master is dead */
freetty = i;
break;
}
}
/* There is no tty allocated to console, allocate the first free found */
if (freetty == -1)
{
system_printf ("No free ttys available");
return -1;
}
tty *t = ttys + freetty;
t->init ();
t->setsid (-1);
t->setpgid (myself->pgid);
t->sethwnd (console);
if (with_console)
{
termios_printf ("console %x associated with tty%d", console, freetty);
create_tty_master (freetty);
}
else
termios_printf ("tty%d allocated", freetty);
return freetty;
}
BOOL
tty::slave_alive ()
{
return alive (TTY_SLAVE_ALIVE);
}
BOOL
tty::master_alive ()
{
return alive (TTY_MASTER_ALIVE);
}
BOOL
tty::alive (const char *fmt)
{
HANDLE ev;
char buf[sizeof (TTY_MASTER_ALIVE) + 16];
__small_sprintf (buf, fmt, ntty);
if ((ev = OpenEvent (EVENT_ALL_ACCESS, TRUE, buf)))
CloseHandle (ev);
return ev != NULL;
}
HANDLE
tty::create_inuse (const char *fmt)
{
HANDLE h;
char buf[sizeof (TTY_MASTER_ALIVE) + 16];
__small_sprintf (buf, fmt, ntty);
h = CreateEvent (&sec_all, 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 (void)
{
OutputStopped = 0;
setsid (0);
pgid = 0;
hwnd = NULL;
to_slave = NULL;
from_slave = NULL;
was_opened = 0;
}
HANDLE
tty::get_event (const char *fmt, BOOL inherit)
{
HANDLE hev;
char buf[40];
__small_sprintf (buf, fmt, ntty);
if (!(hev = CreateEvent (inherit ? &sec_all : &sec_all_nih, FALSE, 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;
}
int
tty::make_pipes (fhandler_pty_master *ptym)
{
/* Create communication pipes */
/* FIXME: should this be sec_none_nih? */
if (CreatePipe (&from_master, &to_slave, &sec_all, 0) == FALSE)
{
termios_printf ("can't create input pipe");
set_errno (ENOENT);
return FALSE;
}
if (CreatePipe (&from_slave, &to_master, &sec_all, 0) == FALSE)
{
termios_printf ("can't create output pipe");
set_errno (ENOENT);
return FALSE;
}
termios_printf ("tty%d from_slave %p, to_slave %p", ntty, from_slave,
to_slave);
ptym->set_io_handle (from_slave);
ptym->set_output_handle (to_slave);
return TRUE;
}
BOOL
tty::common_init (fhandler_pty_master *ptym)
{
/* Set termios information. Force initialization. */
ptym->tcinit (this, TRUE);
if (!make_pipes (ptym))
return FALSE;
ptym->need_nl = 0;
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/* Save our pid */
master_pid = GetCurrentProcessId ();
/* Allow the others to open us (for handle duplication) */
if ((os_being_run == winNT) &&
(SetKernelObjectSecurity (hMainProc, DACL_SECURITY_INFORMATION,
get_null_sd ()) == FALSE))
small_printf ("Can't set process security, %E");
/* Create synchronisation events */
if (ptym->get_device () != FH_TTYM)
{
ptym->output_done_event = ptym->ioctl_done_event =
ptym->ioctl_request_event = NULL;
}
else
{
if (!(ptym->output_done_event = get_event (OUTPUT_DONE_EVENT, FALSE)))
return FALSE;
if (!(ptym->ioctl_done_event = get_event (IOCTL_DONE_EVENT, FALSE)))
return FALSE;
if (!(ptym->ioctl_request_event = get_event (IOCTL_REQUEST_EVENT, FALSE)))
return FALSE;
}
char buf[40];
__small_sprintf (buf, OUTPUT_MUTEX, ntty);
if (!(ptym->output_mutex = CreateMutex (&sec_all, FALSE, buf)))
{
termios_printf ("can't create %s", buf);
set_errno (ENOENT);
return FALSE;
}
ProtectHandle1 (ptym->output_mutex, output_mutex);
winsize.ws_col = 80;
winsize.ws_row = 25;
termios_printf("tty%d opened", ntty);
return TRUE;
}