312 lines
6.1 KiB
C++
312 lines
6.1 KiB
C++
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/* tty.cc
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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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HANDLE NO_COPY tty_list::mutex = NULL;
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extern "C" int
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getpt (void)
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{
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return open ("/dev/ptmx", O_RDWR | O_NOCTTY);
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}
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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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cygheap_fdget cfd (fd);
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return cfd < 0 ? -1 : 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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cygheap_fdget cfd (fd);
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return cfd < 0 ? -1 : 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 (myself->ctty <= 0 || iscons_dev (myself->ctty))
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return -1;
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return device::minor (myself->ctty);
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}
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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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char *name = shared_name (mutex_name, "tty_list::mutex", 0);
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/* tty_list::mutex is used while searching for a tty slot */
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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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}
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int __reg2
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tty_list::attach (int n)
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{
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int res;
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if (iscons_dev (n))
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res = -1;
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else if (n != -1)
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res = connect (device::minor (n));
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else
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res = -1;
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return res;
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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 ("pty %d was not allocated", ttynum);
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set_errno (ENXIO);
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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 (DEV_PTYS_MAJOR, i);
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}
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}
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/* Search for a free tty and allocate it.
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Return tty number or -1 if error.
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*/
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int
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tty_list::allocate (HANDLE& r, HANDLE& w)
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{
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lock_ttys here;
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int freetty = -1;
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tty *t = NULL;
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for (int i = 0; i < NTTYS; i++)
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if (ttys[i].not_allocated (r, w))
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{
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t = ttys + i;
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t->init ();
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t->setsid (0);
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freetty = i;
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break;
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}
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if (freetty >= 0)
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termios_printf ("pty%d allocated", freetty);
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else
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{
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system_printf ("No pty allocated");
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r = w = NULL;
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}
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return freetty;
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}
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bool
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tty::not_allocated (HANDLE& r, HANDLE& w)
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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 we may not have privileges to actually use it. */
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char pipename[sizeof("ptyNNNN-from-master")];
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__small_sprintf (pipename, "pty%d-from-master", get_minor ());
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/* fhandler_pipe::create returns 0 when creation succeeds */
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return fhandler_pipe::create (&sec_none, &r, &w,
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fhandler_pty_common::pipesize, pipename,
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0) == 0;
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}
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bool
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tty::exists ()
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{
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HANDLE r, w;
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bool res;
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if (!not_allocated (r, w))
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res = true;
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else
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{
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/* Handles are left open when not_allocated finds a non-open "tty" */
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CloseHandle (r);
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CloseHandle (w);
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res = false;
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}
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debug_printf ("exists %d", res);
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return res;
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}
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bool
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tty::slave_alive ()
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{
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HANDLE ev;
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if ((ev = open_inuse (READ_CONTROL)))
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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_mutex (const char *mutex, ACCESS_MASK access)
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{
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char buf[MAX_PATH];
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shared_name (buf, mutex, get_minor ());
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return OpenMutex (access, TRUE, buf);
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}
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HANDLE
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tty::open_inuse (ACCESS_MASK access)
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{
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char buf[MAX_PATH];
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shared_name (buf, TTY_SLAVE_ALIVE, get_minor ());
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return OpenEvent (access, FALSE, buf);
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}
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HANDLE
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tty::create_inuse (PSECURITY_ATTRIBUTES sa)
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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, TTY_SLAVE_ALIVE, get_minor ());
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h = CreateEvent (sa, 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 %s, %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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was_opened = false;
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master_pid = 0;
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is_console = false;
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column = 0;
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h_pseudo_console = NULL;
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switch_to_pcon_in = false;
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mask_switch_to_pcon_in = false;
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pcon_pid = 0;
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term_code_page = 0;
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pcon_last_time = 0;
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pcon_start = false;
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pcon_cap_checked = false;
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has_csi6n = false;
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has_set_title = false;
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do_not_resize_pcon = false;
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}
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HANDLE
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tty::get_event (const char *fmt, PSECURITY_ATTRIBUTES sa, 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, get_minor ());
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if (!sa)
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sa = &sec_all;
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if (!(hev = CreateEvent (sa, 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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const char *
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tty_min::ttyname ()
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{
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device d;
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d.parse (ntty);
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return d.name ();
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}
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void
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tty::wait_pcon_fwd (void)
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{
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/* The forwarding in pseudo console sometimes stops for
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16-32 msec even if it already has data to transfer.
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If the time without transfer exceeds 32 msec, the
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forwarding is supposed to be finished. pcon_last_time
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is reset to GetTickCount() in pty master forwarding
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thread when the last data is transfered. */
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const int sleep_in_pcon = 16;
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const int time_to_wait = sleep_in_pcon * 2 + 1/* margine */;
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pcon_last_time = GetTickCount ();
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while (GetTickCount () - pcon_last_time < time_to_wait)
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{
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int tw = time_to_wait - (GetTickCount () - pcon_last_time);
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cygwait (tw);
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}
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}
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