450 lines
10 KiB
C++
450 lines
10 KiB
C++
/* fhandler_termios.cc
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Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010,
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2011, 2012 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 <stdlib.h>
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#include <ctype.h>
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#include "cygerrno.h"
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#include "path.h"
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#include "fhandler.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "tty.h"
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#include "cygtls.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "child_info.h"
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#include "ntdll.h"
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/* Common functions shared by tty/console */
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void
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fhandler_termios::tcinit (bool is_pty_master)
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{
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/* Initial termios values */
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if (is_pty_master || !tc ()->initialized ())
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{
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tc ()->ti.c_iflag = BRKINT | ICRNL | IXON;
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tc ()->ti.c_oflag = OPOST | ONLCR;
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tc ()->ti.c_cflag = B38400 | CS8 | CREAD;
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tc ()->ti.c_lflag = ISIG | ICANON | ECHO | IEXTEN;
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tc ()->ti.c_cc[VDISCARD] = CFLUSH;
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tc ()->ti.c_cc[VEOL] = CEOL;
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tc ()->ti.c_cc[VEOL2] = CEOL2;
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tc ()->ti.c_cc[VEOF] = CEOF;
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tc ()->ti.c_cc[VERASE] = CERASE;
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tc ()->ti.c_cc[VINTR] = CINTR;
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tc ()->ti.c_cc[VKILL] = CKILL;
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tc ()->ti.c_cc[VLNEXT] = CLNEXT;
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tc ()->ti.c_cc[VMIN] = 1;
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tc ()->ti.c_cc[VQUIT] = CQUIT;
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tc ()->ti.c_cc[VREPRINT] = CRPRNT;
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tc ()->ti.c_cc[VSTART] = CSTART;
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tc ()->ti.c_cc[VSTOP] = CSTOP;
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tc ()->ti.c_cc[VSUSP] = CSUSP;
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tc ()->ti.c_cc[VSWTC] = CSWTCH;
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tc ()->ti.c_cc[VTIME] = 0;
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tc ()->ti.c_cc[VWERASE] = CWERASE;
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tc ()->ti.c_ispeed = tc ()->ti.c_ospeed = B38400;
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tc ()->pgid = is_pty_master ? 0 : myself->pgid;
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tc ()->initialized (true);
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}
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}
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int
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fhandler_termios::tcsetpgrp (const pid_t pgid)
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{
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termios_printf ("%s, pgid %d, sid %d, tsid %d", tc ()->ttyname (), pgid,
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myself->sid, tc ()->getsid ());
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if (myself->sid != tc ()->getsid ())
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{
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set_errno (EPERM);
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return -1;
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}
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int res;
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while (1)
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{
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res = bg_check (-SIGTTOU);
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switch (res)
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{
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case bg_ok:
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tc ()->setpgid (pgid);
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if (tc ()->is_console && (strace.active () || !being_debugged ()))
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tc ()->kill_pgrp (__SIGSETPGRP);
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res = 0;
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break;
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case bg_signalled:
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if (_my_tls.call_signal_handler ())
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continue;
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set_errno (EINTR);
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/* fall through intentionally */
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default:
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res = -1;
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break;
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}
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break;
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}
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return res;
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}
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int
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fhandler_termios::tcgetpgrp ()
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{
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if (myself->ctty > 0 && myself->ctty == tc ()->ntty)
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return tc ()->pgid;
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set_errno (ENOTTY);
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return -1;
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}
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int
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fhandler_pty_master::tcgetpgrp ()
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{
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return tc ()->pgid;
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}
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static inline bool
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is_flush_sig (int sig)
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{
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return sig == SIGINT || sig == SIGQUIT || sig == SIGTSTP;
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}
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void
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tty_min::kill_pgrp (int sig)
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{
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bool killself = false;
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if (is_flush_sig (sig) && cygheap->ctty)
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cygheap->ctty->sigflush ();
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winpids pids ((DWORD) PID_MAP_RW);
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siginfo_t si = {0};
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si.si_signo = sig;
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si.si_code = SI_KERNEL;
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for (unsigned i = 0; i < pids.npids; i++)
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{
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_pinfo *p = pids[i];
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if (!p->exists () || p->ctty != ntty || p->pgid != pgid)
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continue;
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if (p == myself)
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killself = sig != __SIGSETPGRP && !exit_state;
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else
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sig_send (p, si);
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}
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if (killself)
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sig_send (myself, si);
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}
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int
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tty_min::is_orphaned_process_group (int pgid)
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{
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/* An orphaned process group is a process group in which the parent
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of every member is either itself a member of the group or is not
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a member of the group's session. */
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termios_printf ("checking pgid %d, my sid %d, my parent %d", pgid, myself->sid, myself->ppid);
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winpids pids ((DWORD) 0);
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for (unsigned i = 0; i < pids.npids; i++)
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{
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_pinfo *p = pids[i];
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termios_printf ("checking pid %d - has pgid %d\n", p->pid, p->pgid);
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if (!p || !p->exists () || p->pgid != pgid)
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continue;
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pinfo ppid (p->ppid);
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if (!ppid)
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continue;
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termios_printf ("ppid->pgid %d, ppid->sid %d", ppid->pgid, ppid->sid);
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if (ppid->pgid != pgid && ppid->sid == myself->sid)
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return 0;
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}
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return 1;
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}
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bg_check_types
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fhandler_termios::bg_check (int sig)
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{
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if (!myself->pgid || !tc () || tc ()->getpgid () == myself->pgid ||
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myself->ctty != tc ()->ntty ||
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((sig == SIGTTOU) && !(tc ()->ti.c_lflag & TOSTOP)))
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return bg_ok;
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if (sig < 0)
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sig = -sig;
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termios_printf ("%s, bg I/O pgid %d, tpgid %d, myctty %s", tc ()->ttyname (),
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myself->pgid, tc ()->getpgid (), myctty ());
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if (tc ()->getsid () == 0)
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{
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/* The pty has been closed by the master. Return an EOF
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indication. FIXME: There is nothing to stop somebody
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from reallocating this pty. I think this is the case
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which is handled by unlockpt on a Unix system. */
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termios_printf ("closed by master");
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return bg_eof;
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}
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int sigs_ignored =
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((void *) global_sigs[sig].sa_handler == (void *) SIG_IGN) ||
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(_main_tls->sigmask & SIGTOMASK (sig));
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/* If the process is ignoring SIGTT*, then background IO is OK. If
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the process is not ignoring SIGTT*, then the sig is to be sent to
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all processes in the process group (unless the process group of the
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process is orphaned, in which case we return EIO). */
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if (sigs_ignored)
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return bg_ok; /* Just allow the IO */
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else if (tc ()->is_orphaned_process_group (myself->pgid))
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{
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termios_printf ("process group is orphaned");
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set_errno (EIO); /* This is an IO error */
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return bg_error;
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}
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else
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{
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/* Don't raise a SIGTT* signal if we have already been
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interrupted by another signal. */
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if (cygwait ((DWORD) 0) != WAIT_SIGNALED)
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{
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siginfo_t si = {0};
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si.si_signo = sig;
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si.si_code = SI_KERNEL;
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kill_pgrp (myself->pgid, si);
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}
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return bg_signalled;
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}
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}
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#define set_input_done(x) input_done = input_done || (x)
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inline void
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fhandler_termios::echo_erase (int force)
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{
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if (force || tc ()->ti.c_lflag & ECHO)
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doecho ("\b \b", 3);
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}
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line_edit_status
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fhandler_termios::line_edit (const char *rptr, int nread, termios& ti)
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{
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line_edit_status ret = line_edit_ok;
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char c;
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int input_done = 0;
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bool sawsig = false;
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int iscanon = ti.c_lflag & ICANON;
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while (nread-- > 0)
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{
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c = *rptr++;
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paranoid_printf ("char %0c", c);
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if (ti.c_iflag & ISTRIP)
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c &= 0x7f;
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if (ti.c_lflag & ISIG)
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{
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int sig;
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if (CCEQ (ti.c_cc[VINTR], c))
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sig = SIGINT;
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else if (CCEQ (ti.c_cc[VQUIT], c))
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sig = SIGQUIT;
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else if (CCEQ (ti.c_cc[VSUSP], c))
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sig = SIGTSTP;
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else
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goto not_a_sig;
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termios_printf ("got interrupt %d, sending signal %d", c, sig);
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eat_readahead (-1);
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tc ()->kill_pgrp (sig);
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ti.c_lflag &= ~FLUSHO;
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sawsig = true;
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goto restart_output;
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}
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not_a_sig:
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if (ti.c_iflag & IXON)
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{
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if (CCEQ (ti.c_cc[VSTOP], c))
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{
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if (!tc ()->output_stopped)
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tc ()->output_stopped = true;
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continue;
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}
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else if (CCEQ (ti.c_cc[VSTART], c))
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{
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restart_output:
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tc ()->output_stopped = false;
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continue;
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}
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else if ((ti.c_iflag & IXANY) && tc ()->output_stopped)
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goto restart_output;
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}
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/* Check for special chars */
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if (c == '\r')
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{
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if (ti.c_iflag & IGNCR)
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continue;
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if (ti.c_iflag & ICRNL)
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{
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c = '\n';
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set_input_done (iscanon);
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}
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}
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else if (c == '\n')
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{
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if (ti.c_iflag & INLCR)
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c = '\r';
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else
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set_input_done (iscanon);
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}
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if (iscanon && ti.c_lflag & IEXTEN && CCEQ (ti.c_cc[VDISCARD], c))
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{
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ti.c_lflag ^= FLUSHO;
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continue;
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}
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if (!iscanon)
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/* nothing */;
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else if (CCEQ (ti.c_cc[VERASE], c))
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{
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if (eat_readahead (1))
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echo_erase ();
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continue;
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}
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else if (CCEQ (ti.c_cc[VWERASE], c))
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{
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int ch;
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do
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if (!eat_readahead (1))
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break;
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else
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echo_erase ();
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while ((ch = peek_readahead (1)) >= 0 && !isspace (ch));
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continue;
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}
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else if (CCEQ (ti.c_cc[VKILL], c))
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{
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int nchars = eat_readahead (-1);
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if (ti.c_lflag & ECHO)
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while (nchars--)
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echo_erase (1);
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continue;
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}
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else if (CCEQ (ti.c_cc[VREPRINT], c))
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{
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if (ti.c_lflag & ECHO)
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{
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doecho ("\n\r", 2);
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doecho (rabuf, ralen);
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}
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continue;
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}
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else if (CCEQ (ti.c_cc[VEOF], c))
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{
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termios_printf ("EOF");
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accept_input ();
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ret = line_edit_input_done;
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continue;
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}
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else if (CCEQ (ti.c_cc[VEOL], c) ||
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CCEQ (ti.c_cc[VEOL2], c) ||
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c == '\n')
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{
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set_input_done (1);
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termios_printf ("EOL");
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}
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if (ti.c_iflag & IUCLC && isupper (c))
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c = cyg_tolower (c);
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put_readahead (c);
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if (ti.c_lflag & ECHO)
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doecho (&c, 1);
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if (!iscanon || input_done)
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{
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int status = accept_input ();
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if (status != 1)
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{
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ret = status ? line_edit_error : line_edit_pipe_full;
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eat_readahead (1);
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break;
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}
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ret = line_edit_input_done;
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input_done = 0;
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}
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}
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if (!iscanon && ralen > 0)
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ret = line_edit_input_done;
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if (sawsig)
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ret = line_edit_signalled;
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return ret;
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}
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off_t
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fhandler_termios::lseek (off_t, int)
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{
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set_errno (ESPIPE);
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return -1;
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}
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void
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fhandler_termios::sigflush ()
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{
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/* FIXME: Checking get_ttyp() for NULL is not right since it should not
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be NULL while this is alive. However, we can conceivably close a
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ctty while exiting and that will zero this. */
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if ((!have_execed || have_execed_cygwin) && tc ()
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&& (tc ()->getpgid () == myself->pgid)
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&& !(tc ()->ti.c_lflag & NOFLSH))
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tcflush (TCIFLUSH);
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}
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pid_t
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fhandler_termios::tcgetsid ()
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{
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if (myself->ctty > 0 && myself->ctty == tc ()->ntty)
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return tc ()->getsid ();
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set_errno (ENOTTY);
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return -1;
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}
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int
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fhandler_termios::ioctl (int cmd, void *varg)
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{
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if (cmd != TIOCSCTTY)
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return 1; /* Not handled by this function */
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int arg = (int) (intptr_t) varg;
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if (arg != 0 && arg != 1)
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{
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set_errno (EINVAL);
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return -1;
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}
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termios_printf ("myself->ctty %d, myself->sid %d, myself->pid %d, arg %d, tc()->getsid () %d\n",
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myself->ctty, myself->sid, myself->pid, arg, tc ()->getsid ());
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if (myself->ctty > 0 || myself->sid != myself->pid || (!arg && tc ()->getsid () > 0))
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{
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set_errno (EPERM);
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return -1;
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}
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myself->ctty = -1;
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myself->set_ctty (this, 0);
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return 0;
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}
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