/* tty.cc This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include "miscfuncs.h" #include #include #include #include "cygerrno.h" #include "security.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "pinfo.h" #include "shared_info.h" HANDLE NO_COPY tty_list::mutex = NULL; extern "C" int getpt (void) { return open ("/dev/ptmx", O_RDWR | O_NOCTTY); } extern "C" int posix_openpt (int oflags) { return open ("/dev/ptmx", oflags); } extern "C" int grantpt (int fd) { cygheap_fdget cfd (fd); return cfd < 0 ? -1 : 0; } extern "C" int unlockpt (int fd) { cygheap_fdget cfd (fd); return cfd < 0 ? -1 : 0; } extern "C" int revoke (char *ttyname) { set_errno (ENOSYS); return -1; } extern "C" int ttyslot (void) { if (myself->ctty <= 0 || iscons_dev (myself->ctty)) return -1; return device::minor (myself->ctty); } void __stdcall tty_list::init_session () { char mutex_name[MAX_PATH]; char *name = shared_name (mutex_name, "tty_list::mutex", 0); /* tty_list::mutex is used while searching for a tty slot */ if (!(mutex = CreateMutex (&sec_all_nih, FALSE, name))) api_fatal ("can't create tty_list::mutex '%s', %E", name); ProtectHandle (mutex); } void __stdcall tty::init_session () { if (!myself->cygstarted && NOTSTATE (myself, PID_CYGPARENT)) cygheap->fdtab.get_debugger_info (); } int __reg2 tty_list::attach (int n) { int res; if (iscons_dev (n)) res = -1; else if (n != -1) res = connect (device::minor (n)); else res = -1; return res; } int tty_list::connect (int ttynum) { if (ttynum < 0 || ttynum >= NTTYS) { termios_printf ("ttynum (%d) out of range", ttynum); return -1; } if (!ttys[ttynum].exists ()) { termios_printf ("pty %d was not allocated", ttynum); set_errno (ENXIO); return -1; } return ttynum; } void tty_list::init () { for (int i = 0; i < NTTYS; i++) { ttys[i].init (); ttys[i].setntty (DEV_PTYS_MAJOR, i); } } /* Search for a free tty and allocate it. Return tty number or -1 if error. */ int tty_list::allocate (HANDLE& r, HANDLE& w) { lock_ttys here; int freetty = -1; tty *t = NULL; for (int i = 0; i < NTTYS; i++) if (ttys[i].not_allocated (r, w)) { t = ttys + i; t->init (); t->setsid (0); freetty = i; break; } if (freetty >= 0) termios_printf ("pty%d allocated", freetty); else { system_printf ("No pty allocated"); r = w = NULL; } return freetty; } bool tty::not_allocated (HANDLE& r, HANDLE& w) { /* Attempt to open the from-master side of the tty. If it is accessible then it exists although we may not have privileges to actually use it. */ char pipename[sizeof("ptyNNNN-from-master")]; __small_sprintf (pipename, "pty%d-from-master", get_minor ()); /* fhandler_pipe::create returns 0 when creation succeeds */ return fhandler_pipe::create (&sec_none, &r, &w, fhandler_pty_common::pipesize, pipename, 0) == 0; } bool tty::exists () { HANDLE r, w; bool res; if (!not_allocated (r, w)) res = true; else { /* Handles are left open when not_allocated finds a non-open "tty" */ CloseHandle (r); CloseHandle (w); res = false; } debug_printf ("exists %d", res); return res; } bool tty::slave_alive () { HANDLE ev; if ((ev = open_inuse (READ_CONTROL))) CloseHandle (ev); return ev != NULL; } HANDLE tty::open_mutex (const char *mutex, ACCESS_MASK access) { char buf[MAX_PATH]; shared_name (buf, mutex, get_minor ()); return OpenMutex (access, TRUE, buf); } HANDLE tty::open_inuse (ACCESS_MASK access) { char buf[MAX_PATH]; shared_name (buf, TTY_SLAVE_ALIVE, get_minor ()); return OpenEvent (access, FALSE, buf); } HANDLE tty::create_inuse (PSECURITY_ATTRIBUTES sa) { HANDLE h; char buf[MAX_PATH]; shared_name (buf, TTY_SLAVE_ALIVE, get_minor ()); h = CreateEvent (sa, TRUE, FALSE, buf); termios_printf ("%s %p", buf, h); if (!h) termios_printf ("couldn't open inuse event %s, %E", buf); return h; } void tty::init () { output_stopped = 0; setsid (0); pgid = 0; was_opened = false; master_pid = 0; is_console = false; attach_pcon_in_fork = false; hPseudoConsole = NULL; column = 0; switch_to_pcon_in = false; switch_to_pcon_out = false; screen_alternated = false; mask_switch_to_pcon_in = false; pcon_pid = 0; num_pcon_attached_slaves = 0; term_code_page = 0; need_clear_screen = false; } HANDLE tty::get_event (const char *fmt, PSECURITY_ATTRIBUTES sa, BOOL manual_reset) { HANDLE hev; char buf[MAX_PATH]; shared_name (buf, fmt, get_minor ()); if (!sa) sa = &sec_all; if (!(hev = CreateEvent (sa, manual_reset, FALSE, buf))) { termios_printf ("couldn't create %s", buf); set_errno (ENOENT); /* FIXME this can't be the right errno */ return NULL; } termios_printf ("created event %s", buf); return hev; } lock_ttys::lock_ttys (DWORD howlong): release_me (true) { if (WaitForSingleObject (tty_list::mutex, howlong) == WAIT_FAILED) { termios_printf ("WFSO for mutex %p failed, %E", tty_list::mutex); release_me = false; } } void lock_ttys::release () { ReleaseMutex (tty_list::mutex); } const char * tty_min::ttyname () { device d; d.parse (ntty); return d.name (); }