084ea5108e
* miscfuncs.cc (yield): Rename from low_priority_sleep. Remove all of the logic which called Sleep() and just use SwitchToThread. * miscfuncs.h (yield): Rename from low_priority_sleep. (SLEEP_0_STAY_LOW): Delete unused define. * shared.cc (memory_init): Move heap_init() call directly after shared memory initialization to more closely mimic long-standing program flow. * tty.cc (tty_list::terminate): Replace call to low_priority_sleep with Sleep.
408 lines
8.4 KiB
C++
408 lines
8.4 KiB
C++
/* tty.cc
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Copyright 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009
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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 "miscfuncs.h"
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#include <unistd.h>
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#include <utmp.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 "shared_info.h"
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extern fhandler_tty_master *tty_master;
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extern "C" int
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posix_openpt (int oflags)
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{
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return open ("/dev/ptmx", oflags);
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}
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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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HANDLE NO_COPY tty_list::mutex = NULL;
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void __stdcall
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tty_list::init_session ()
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{
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char mutex_name[MAX_PATH];
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/* tty_list::mutex is used while searching for a tty slot. It's necessary
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while finding console window handle */
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char *name = shared_name (mutex_name, "tty_list::mutex", 0);
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if (!(mutex = CreateMutex (&sec_all_nih, FALSE, name)))
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api_fatal ("can't create tty_list::mutex '%s', %E", name);
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ProtectHandle (mutex);
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}
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void __stdcall
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tty::init_session ()
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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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/* nothing to do */;
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else if (NOTSTATE (myself, PID_CYGPARENT))
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myself->ctty = cygwin_shared->tty.attach (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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tty::create_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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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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int __stdcall
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tty_list::attach (int num)
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{
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if (num != -1)
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{
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return connect (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 allocate (true);
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}
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void
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tty_list::terminate ()
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{
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if (NOTSTATE (myself, PID_USETTY))
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return;
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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 && tty_master && ttys[ttynum].master_pid == myself->pid)
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{
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tty *t = ttys + ttynum;
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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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lock_ttys here ();
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CloseHandle (tty_master->from_master);
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CloseHandle (tty_master->to_master);
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termios_printf ("tty %d master about to finish", ttynum);
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CloseHandle (tty_master->get_io_handle ());
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CloseHandle (tty_master->get_output_handle ());
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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 (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 ()
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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 with_console == 0, just find a free tty.
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*/
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int
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tty_list::allocate (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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lock_ttys here;
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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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termios_printf ("Can't find console window");
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goto out;
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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->sethwnd (console);
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out:
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if (freetty < 0)
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system_printf ("No tty allocated");
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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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here.dont_release (); /* exit with 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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tty::create_master (freetty);
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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::exists ()
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{
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/* Attempt to open the from-master side of the tty. If it is accessible
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then it exists although it may have been privileges to actually use it. */
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char pipename[sizeof("ttyNNNN-from-master")];
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__small_sprintf (pipename, "tty%d-from-master", ntty);
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HANDLE r, w;
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int res = fhandler_pipe::create_selectable (&sec_none_nih, r, w, 0, pipename);
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if (res)
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return true;
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CloseHandle (r);
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CloseHandle (w);
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HANDLE h = open_output_mutex ();
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if (h)
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{
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CloseHandle (h);
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return true;
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}
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return slave_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[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[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[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 ()
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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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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[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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lock_ttys::lock_ttys (DWORD howlong): release_me (true)
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{
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if (WaitForSingleObject (tty_list::mutex, howlong) == WAIT_FAILED)
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{
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termios_printf ("WFSO for mutex %p failed, %E", tty_list::mutex);
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release_me = false;
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}
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}
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void
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lock_ttys::release ()
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{
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ReleaseMutex (tty_list::mutex);
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}
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