501 lines
11 KiB
C++
501 lines
11 KiB
C++
/* tty.cc
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Copyright 1997, 1998, 2000, 2001, 2002 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <utmp.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include <sys/cygwin.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "pinfo.h"
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#include "cygserver.h"
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#include "shared_info.h"
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#include "cygthread.h"
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extern fhandler_tty_master *tty_master;
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extern "C" int
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grantpt (int fd)
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{
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return 0;
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}
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extern "C" int
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unlockpt (int fd)
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{
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return 0;
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}
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extern "C" int
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revoke (char *ttyname)
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{
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set_errno (ENOSYS);
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return -1;
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}
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extern "C" int
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ttyslot (void)
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{
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if (NOTSTATE (myself, PID_USETTY))
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return -1;
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return myself->ctty;
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}
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void __stdcall
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tty_init (void)
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{
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if (!myself->cygstarted && NOTSTATE (myself, PID_CYGPARENT))
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cygheap->fdtab.get_debugger_info ();
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if (NOTSTATE (myself, PID_USETTY))
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return;
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if (myself->ctty == -1)
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if (NOTSTATE (myself, PID_CYGPARENT))
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myself->ctty = attach_tty (myself->ctty);
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else
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return;
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if (myself->ctty == -1)
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termios_printf ("Can't attach to tty");
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}
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/* Create session's master tty */
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void __stdcall
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create_tty_master (int ttynum)
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{
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device ttym = *ttym_dev;
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ttym.setunit (ttynum); /* CGF FIXME device */
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tty_master = (fhandler_tty_master *) build_fh_dev (ttym);
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if (tty_master->init ())
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api_fatal ("Can't create master tty");
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else
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{
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/* Log utmp entry */
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struct utmp our_utmp;
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DWORD len = sizeof our_utmp.ut_host;
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bzero ((char *) &our_utmp, sizeof (utmp));
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(void) time (&our_utmp.ut_time);
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strncpy (our_utmp.ut_name, getlogin (), sizeof (our_utmp.ut_name));
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GetComputerName (our_utmp.ut_host, &len);
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__small_sprintf (our_utmp.ut_line, "tty%d", ttynum);
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if ((len = strlen (our_utmp.ut_line)) >= UT_IDLEN)
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len -= UT_IDLEN;
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else
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len = 0;
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strncpy (our_utmp.ut_id, our_utmp.ut_line + len, UT_IDLEN);
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our_utmp.ut_type = USER_PROCESS;
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our_utmp.ut_pid = myself->pid;
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myself->ctty = ttynum;
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login (&our_utmp);
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}
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}
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void __stdcall
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tty_terminate (void)
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{
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if (NOTSTATE (myself, PID_USETTY))
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return;
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cygwin_shared->tty.terminate ();
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}
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int __stdcall
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attach_tty (int num)
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{
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if (num != -1)
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{
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return cygwin_shared->tty.connect_tty (num);
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}
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if (NOTSTATE (myself, PID_USETTY))
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return -1;
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return cygwin_shared->tty.allocate_tty (true);
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}
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void
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tty_list::terminate (void)
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{
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int ttynum = myself->ctty;
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/* Keep master running till there are connected clients */
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if (ttynum != -1 && ttys[ttynum].master_pid == GetCurrentProcessId ())
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{
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tty *t = ttys + ttynum;
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CloseHandle (t->from_master);
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CloseHandle (t->to_master);
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/* Wait for children which rely on tty handling in this process to
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go away */
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for (int i = 0; ; i++)
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{
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if (!t->slave_alive ())
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break;
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if (i >= 100)
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{
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small_printf ("waiting for children using tty%d to terminate\n",
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ttynum);
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i = 0;
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}
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low_priority_sleep (200);
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}
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if (WaitForSingleObject (tty_mutex, INFINITE) == WAIT_FAILED)
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termios_printf ("WFSO for tty_mutex %p failed, %E", tty_mutex);
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termios_printf ("tty %d master about to finish", ttynum);
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ForceCloseHandle1 (t->to_slave, to_pty);
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ForceCloseHandle1 (t->from_slave, from_pty);
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CloseHandle (tty_master->inuse);
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t->init ();
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char buf[20];
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__small_sprintf (buf, "tty%d", ttynum);
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logout (buf);
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ReleaseMutex (tty_mutex);
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}
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}
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int
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tty_list::connect_tty (int ttynum)
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{
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if (ttynum < 0 || ttynum >= NTTYS)
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{
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termios_printf ("ttynum (%d) out of range", ttynum);
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return -1;
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}
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if (!ttys[ttynum].exists ())
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{
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termios_printf ("tty %d was not allocated", ttynum);
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return -1;
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}
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return ttynum;
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}
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void
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tty_list::init (void)
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{
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for (int i = 0; i < NTTYS; i++)
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{
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ttys[i].init ();
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ttys[i].setntty (i);
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}
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}
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/* Search for tty class for our console. Allocate new tty if our process is
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the only cygwin process in the current console.
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Return tty number or -1 if error.
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If flag == 0, just find a free tty.
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*/
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int
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tty_list::allocate_tty (bool with_console)
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{
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HWND console;
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int freetty = -1;
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HANDLE hmaster = NULL;
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/* FIXME: This whole function needs a protective mutex. */
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if (WaitForSingleObject (tty_mutex, INFINITE) == WAIT_FAILED)
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termios_printf ("WFSO for tty_mutex %p failed, %E", tty_mutex);
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if (!with_console)
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console = NULL;
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else if (!(console = GetConsoleWindow ()))
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{
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char oldtitle[TITLESIZE];
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if (!GetConsoleTitle (oldtitle, TITLESIZE))
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{
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termios_printf ("Can't read console title");
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goto out;
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}
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char buf[40];
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__small_sprintf (buf, "cygwin.find.console.%d", myself->pid);
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SetConsoleTitle (buf);
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for (int times = 0; times < 25; times++)
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{
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Sleep (10);
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if ((console = FindWindow (NULL, buf)))
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break;
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}
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SetConsoleTitle (oldtitle);
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Sleep (40);
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if (console == NULL)
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{
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termios_printf ("Can't find console window");
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goto out;
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}
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}
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/* Is a tty allocated for console? */
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for (int i = 0; i < NTTYS; i++)
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{
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if (!ttys[i].exists ())
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{
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if (freetty < 0) /* Scanning? */
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freetty = i; /* Yes. */
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if (!with_console) /* Do we want to attach this to a console? */
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break; /* No. We've got one. */
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}
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/* FIXME: Is this right? We can potentially query a "nonexistent"
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tty slot after falling through from the above? */
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if (with_console && ttys[i].gethwnd () == console)
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{
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termios_printf ("console %x already associated with tty%d",
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console, i);
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/* Is the master alive? */
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hmaster = OpenProcess (PROCESS_DUP_HANDLE, FALSE, ttys[i].master_pid);
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if (hmaster)
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{
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CloseHandle (hmaster);
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freetty = i;
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goto out;
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}
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/* Master is dead */
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freetty = i;
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break;
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}
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}
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/* There is no tty allocated to console, allocate the first free found */
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if (freetty == -1)
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goto out;
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tty *t;
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t = ttys + freetty;
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t->init ();
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t->setsid (-1);
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t->setpgid (myself->pgid);
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t->sethwnd (console);
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out:
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if (freetty < 0)
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{
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ReleaseMutex (tty_mutex);
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system_printf ("No tty allocated");
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}
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else if (!with_console)
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{
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termios_printf ("tty%d allocated", freetty);
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/* exit with tty_mutex still held -- caller has more work to do */
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}
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else
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{
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termios_printf ("console %p associated with tty%d", console, freetty);
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if (!hmaster)
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create_tty_master (freetty);
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ReleaseMutex (tty_mutex);
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}
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return freetty;
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}
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bool
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tty::slave_alive ()
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{
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return alive (TTY_SLAVE_ALIVE);
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}
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bool
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tty::master_alive ()
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{
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return alive (TTY_MASTER_ALIVE);
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}
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bool
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tty::alive (const char *fmt)
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{
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HANDLE ev;
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char buf[CYG_MAX_PATH];
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shared_name (buf, fmt, ntty);
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if ((ev = OpenEvent (EVENT_ALL_ACCESS, FALSE, buf)))
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CloseHandle (ev);
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return ev != NULL;
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}
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HANDLE
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tty::open_output_mutex ()
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{
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return open_mutex (OUTPUT_MUTEX);
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}
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HANDLE
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tty::open_input_mutex ()
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{
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return open_mutex (INPUT_MUTEX);
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}
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HANDLE
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tty::open_mutex (const char *mutex)
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{
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char buf[CYG_MAX_PATH];
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shared_name (buf, mutex, ntty);
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return OpenMutex (MUTEX_ALL_ACCESS, TRUE, buf);
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}
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HANDLE
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tty::create_inuse (const char *fmt)
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{
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HANDLE h;
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char buf[CYG_MAX_PATH];
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shared_name (buf, fmt, ntty);
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h = CreateEvent (&sec_all, TRUE, FALSE, buf);
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termios_printf ("%s %p", buf, h);
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if (!h)
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termios_printf ("couldn't open inuse event, %E", buf);
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return h;
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}
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void
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tty::init (void)
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{
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output_stopped = 0;
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setsid (0);
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pgid = 0;
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hwnd = NULL;
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to_slave = NULL;
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from_slave = NULL;
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was_opened = 0;
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master_pid = 0;
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}
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HANDLE
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tty::get_event (const char *fmt, BOOL manual_reset)
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{
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HANDLE hev;
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char buf[CYG_MAX_PATH];
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shared_name (buf, fmt, ntty);
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if (!(hev = CreateEvent (&sec_all, manual_reset, FALSE, buf)))
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{
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termios_printf ("couldn't create %s", buf);
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set_errno (ENOENT); /* FIXME this can't be the right errno */
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return NULL;
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}
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termios_printf ("created event %s", buf);
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return hev;
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}
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bool
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tty::make_pipes (fhandler_pty_master *ptym)
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{
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/* Create communication pipes */
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/* FIXME: should this be sec_none_nih? */
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if (!CreatePipe (&from_master, &to_slave, &sec_all, 128 * 1024))
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{
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termios_printf ("can't create input pipe");
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set_errno (ENOENT);
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return false;
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}
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// ProtectHandle1INH (to_slave, to_pty);
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if (!CreatePipe (&from_slave, &to_master, &sec_all, 128 * 1024))
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{
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termios_printf ("can't create output pipe");
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set_errno (ENOENT);
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return false;
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}
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// ProtectHandle1INH (from_slave, from_pty);
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termios_printf ("tty%d from_slave %p, to_slave %p", ntty, from_slave,
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to_slave);
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DWORD pipe_mode = PIPE_NOWAIT;
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if (!SetNamedPipeHandleState (to_slave, &pipe_mode, NULL, NULL))
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termios_printf ("can't set to_slave to non-blocking mode");
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ptym->set_io_handle (from_slave);
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ptym->set_output_handle (to_slave);
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return true;
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}
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bool
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tty::common_init (fhandler_pty_master *ptym)
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{
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/* Set termios information. Force initialization. */
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ptym->tcinit (this, true);
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if (!make_pipes (ptym))
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return false;
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ptym->need_nl = 0;
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/* Save our pid */
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master_pid = GetCurrentProcessId ();
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/* We do not open allow the others to open us (for handle duplication)
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but rely on cygheap->inherited_ctty for descendant processes.
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In the future the cygserver may allow access by others. */
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#ifdef USE_SERVER
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if (wincap.has_security ())
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{
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if (cygserver_running == CYGSERVER_UNKNOWN)
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cygserver_init ();
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}
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#endif
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/* Create synchronisation events */
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if (ptym->get_major () != DEV_TTYM_MAJOR)
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{
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ptym->output_done_event = ptym->ioctl_done_event =
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ptym->ioctl_request_event = NULL;
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}
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else
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{
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if (!(ptym->output_done_event = get_event (OUTPUT_DONE_EVENT)))
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return false;
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if (!(ptym->ioctl_done_event = get_event (IOCTL_DONE_EVENT)))
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return false;
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if (!(ptym->ioctl_request_event = get_event (IOCTL_REQUEST_EVENT)))
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return false;
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}
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if (!(ptym->input_available_event = get_event (INPUT_AVAILABLE_EVENT, TRUE)))
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return false;
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char buf[CYG_MAX_PATH];
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shared_name (buf, OUTPUT_MUTEX, ntty);
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if (!(ptym->output_mutex = CreateMutex (&sec_all, FALSE, buf)))
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{
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termios_printf ("can't create %s", buf);
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set_errno (ENOENT);
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return false;
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}
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shared_name (buf, INPUT_MUTEX, ntty);
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if (!(ptym->input_mutex = CreateMutex (&sec_all, FALSE, buf)))
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{
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termios_printf ("can't create %s", buf);
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set_errno (ENOENT);
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return false;
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}
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// /* screws up tty master */ ProtectHandle1INH (ptym->output_mutex, output_mutex);
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// /* screws up tty master */ ProtectHandle1INH (ptym->input_mutex, input_mutex);
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winsize.ws_col = 80;
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winsize.ws_row = 25;
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termios_printf ("tty%d opened", ntty);
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return true;
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}
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