427 lines
9.1 KiB
C++
427 lines
9.1 KiB
C++
/* tty.cc
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Copyright 1997, 1998, 2000 Cygnus Solutions.
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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 <errno.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 "fhandler.h"
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#include "dtable.h"
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#include "sync.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "shared_info.h"
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#include "security.h"
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extern fhandler_tty_master *tty_master;
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extern "C"
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int
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grantpt (void)
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{
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return 0;
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}
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extern "C"
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int
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unlockpt (void)
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{
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return 0;
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}
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extern "C"
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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 (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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tty_master = (fhandler_tty_master *) fdtab.build_fhandler (-1, FH_TTYM,
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"/dev/ttym", ttynum);
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if (tty_master->init (ttynum))
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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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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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cygwin_gethostname (our_utmp.ut_host, sizeof (our_utmp.ut_host));
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__small_sprintf (our_utmp.ut_line, "tty%d", ttynum);
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our_utmp.ut_type = USER_PROCESS;
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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 (1);
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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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Sleep (200);
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}
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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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WaitForSingleObject (tty_master->hThread, INFINITE);
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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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}
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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 (int with_console)
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{
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HWND console;
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/* FIXME: This whole function needs a protective mutex. */
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if (!with_console)
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console = NULL;
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else
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{
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char *oldtitle = new char [TITLESIZE];
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if (!oldtitle)
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{
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termios_printf ("Can't *allocate console title buffer");
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return -1;
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}
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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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return -1;
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}
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if (WaitForSingleObject (title_mutex, INFINITE) == WAIT_FAILED)
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termios_printf ("WFSO for title_mutext %p failed, %E", title_mutex);
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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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Sleep (40);
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console = FindWindow (NULL, buf);
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SetConsoleTitle (oldtitle);
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Sleep (40);
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ReleaseMutex (title_mutex);
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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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return -1;
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}
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}
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/* Is a tty allocated for console? */
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int freetty = -1;
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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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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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HANDLE hMaster;
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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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return i;
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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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{
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system_printf ("No free ttys available");
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return -1;
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}
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tty *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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if (with_console)
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{
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termios_printf ("console %x associated with tty%d", console, freetty);
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create_tty_master (freetty);
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}
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else
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termios_printf ("tty%d allocated", freetty);
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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[sizeof (TTY_MASTER_ALIVE) + 16];
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__small_sprintf (buf, fmt, ntty);
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if ((ev = OpenEvent (EVENT_ALL_ACCESS, TRUE, 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::create_inuse (const char *fmt)
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{
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HANDLE h;
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char buf[sizeof (TTY_MASTER_ALIVE) + 16];
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__small_sprintf (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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OutputStopped = 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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}
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HANDLE
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tty::get_event (const char *fmt, BOOL inherit)
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{
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HANDLE hev;
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char buf[40];
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__small_sprintf (buf, fmt, ntty);
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if (!(hev = CreateEvent (inherit ? &sec_all : &sec_all_nih, FALSE, 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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int
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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, 0) == FALSE)
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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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ProtectHandle1 (to_slave, to_pty);
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if (CreatePipe (&from_slave, &to_master, &sec_all, 0) == FALSE)
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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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ProtectHandle1 (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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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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/* Allow the others to open us (for handle duplication) */
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if ((os_being_run == winNT) &&
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(SetKernelObjectSecurity (hMainProc, DACL_SECURITY_INFORMATION,
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get_null_sd ()) == FALSE))
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small_printf ("Can't set process security, %E");
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/* Create synchronisation events */
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if (ptym->get_device () != FH_TTYM)
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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, FALSE)))
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return FALSE;
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if (!(ptym->ioctl_done_event = get_event (IOCTL_DONE_EVENT, FALSE)))
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return FALSE;
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if (!(ptym->ioctl_request_event = get_event (IOCTL_REQUEST_EVENT, FALSE)))
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return FALSE;
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}
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char buf[40];
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__small_sprintf (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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ProtectHandle1 (ptym->output_mutex, output_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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