aaa812cbd0
handling when stopped by CTRL-S. * fhandler_tty.cc (bytes_available): Add arguments to debug_only_printf call. * sigproc.cc (proc_subproc): Simplify some if logic.
1776 lines
45 KiB
C++
1776 lines
45 KiB
C++
/* fhandler_tty.cc
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|
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Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 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 <sys/param.h>
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#include <cygwin/kd.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 "sigproc.h"
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#include "pinfo.h"
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#include "ntdll.h"
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#include "cygheap.h"
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#include "shared_info.h"
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#include "cygthread.h"
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#include "child_info.h"
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#include <asm/socket.h>
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#include "cygwait.h"
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|
|
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#define close_maybe(h) \
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do { \
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if (h && h != INVALID_HANDLE_VALUE) \
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CloseHandle (h); \
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} while (0)
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/* pty master control pipe messages */
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struct pipe_request {
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DWORD pid;
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};
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struct pipe_reply {
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HANDLE from_master;
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HANDLE to_master;
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DWORD error;
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};
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int
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fhandler_pty_slave::get_unit ()
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{
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return dev ().get_minor ();
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}
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bool
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bytes_available (DWORD& n, HANDLE h)
|
|
{
|
|
DWORD navail, nleft;
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navail = nleft = 0;
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bool succeeded = PeekNamedPipe (h, NULL, 0, NULL, &navail, &nleft);
|
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if (succeeded)
|
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/* nleft should always be the right choice unless something has written 0
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bytes to the pipe. In that pathological case we return the actual number
|
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of bytes available in the pipe. See cgf-000008 for more details. */
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n = nleft ?: navail;
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|
else
|
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{
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|
termios_printf ("PeekNamedPipe(%p) failed, %E", h);
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n = 0;
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|
}
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debug_only_printf ("n %u, nleft %u, navail %u", n, nleft, navail);
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return succeeded;
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}
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bool
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fhandler_pty_common::bytes_available (DWORD &n)
|
|
{
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return ::bytes_available (n, get_handle ());
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}
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#ifdef DEBUGGING
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static class mutex_stack
|
|
{
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public:
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const char *fn;
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int ln;
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const char *tname;
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} ostack[100];
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static int osi;
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#endif /*DEBUGGING*/
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void
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fhandler_pty_master::flush_to_slave ()
|
|
{
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if (get_readahead_valid () && !(get_ttyp ()->ti.c_lflag & ICANON))
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accept_input ();
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}
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DWORD
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fhandler_pty_common::__acquire_output_mutex (const char *fn, int ln,
|
|
DWORD ms)
|
|
{
|
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if (strace.active ())
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strace.prntf (_STRACE_TERMIOS, fn, "(%d): pty output_mutex (%p): waiting %d ms", ln, output_mutex, ms);
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DWORD res = WaitForSingleObject (output_mutex, ms);
|
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if (res == WAIT_OBJECT_0)
|
|
{
|
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#ifndef DEBUGGING
|
|
if (strace.active ())
|
|
strace.prntf (_STRACE_TERMIOS, fn, "(%d): pty output_mutex: acquired", ln, res);
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#else
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ostack[osi].fn = fn;
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ostack[osi].ln = ln;
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ostack[osi].tname = cygthread::name ();
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termios_printf ("acquired for %s:%d, osi %d", fn, ln, osi);
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osi++;
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#endif
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}
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return res;
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}
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|
|
void
|
|
fhandler_pty_common::__release_output_mutex (const char *fn, int ln)
|
|
{
|
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if (ReleaseMutex (output_mutex))
|
|
{
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|
#ifndef DEBUGGING
|
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if (strace.active ())
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strace.prntf (_STRACE_TERMIOS, fn, "(%d): pty output_mutex(%p) released", ln, output_mutex);
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#else
|
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if (osi > 0)
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osi--;
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termios_printf ("released(%p) at %s:%d, osi %d", output_mutex, fn, ln, osi);
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termios_printf (" for %s:%d (%s)", ostack[osi].fn, ostack[osi].ln, ostack[osi].tname);
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ostack[osi].ln = -ln;
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#endif
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}
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#ifdef DEBUGGING
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else if (osi > 0)
|
|
{
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system_printf ("couldn't release output mutex but we seem to own it, %E");
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try_to_debug ();
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|
}
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#endif
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}
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/* Process pty input. */
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void
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fhandler_pty_master::doecho (const void *str, DWORD len)
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|
{
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|
acquire_output_mutex (INFINITE);
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if (!WriteFile (to_master, str, len, &len, NULL))
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termios_printf ("Write to %p failed, %E", to_master);
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release_output_mutex ();
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|
}
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int
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fhandler_pty_master::accept_input ()
|
|
{
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|
DWORD bytes_left;
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int ret = 1;
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WaitForSingleObject (input_mutex, INFINITE);
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bytes_left = eat_readahead (-1);
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if (!bytes_left)
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{
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termios_printf ("sending EOF to slave");
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get_ttyp ()->read_retval = 0;
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|
}
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else
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{
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|
char *p = rabuf;
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DWORD rc;
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DWORD written = 0;
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paranoid_printf ("about to write %d chars to slave", bytes_left);
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rc = WriteFile (get_output_handle (), p, bytes_left, &written, NULL);
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if (!rc)
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{
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debug_printf ("error writing to pipe %p %E", get_output_handle ());
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get_ttyp ()->read_retval = -1;
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ret = -1;
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}
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else
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{
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get_ttyp ()->read_retval = 1;
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p += written;
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bytes_left -= written;
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if (bytes_left > 0)
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{
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debug_printf ("to_slave pipe is full");
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puts_readahead (p, bytes_left);
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ret = 0;
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}
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}
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}
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SetEvent (input_available_event);
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ReleaseMutex (input_mutex);
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return ret;
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}
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bool
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fhandler_pty_master::hit_eof ()
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|
{
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if (get_ttyp ()->was_opened && !get_ttyp ()->slave_alive ())
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|
{
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/* We have the only remaining open handle to this pty, and
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the slave pty has been opened at least once. We treat
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this as EOF. */
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termios_printf ("all other handles closed");
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return 1;
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}
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return 0;
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}
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/* Process pty output requests */
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|
int
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fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on)
|
|
{
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|
size_t rlen;
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char outbuf[OUT_BUFFER_SIZE + 1];
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DWORD n;
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int column = 0;
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int rc = 0;
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flush_to_slave ();
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if (len == 0)
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goto out;
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if (need_nl)
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{
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/* We need to return a left over \n character, resulting from
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\r\n conversion. Note that we already checked for FLUSHO and
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output_stopped at the time that we read the character, so we
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|
don't check again here. */
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if (buf)
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buf[0] = '\n';
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need_nl = 0;
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rc = 1;
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goto out;
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}
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for (;;)
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{
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/* Set RLEN to the number of bytes to read from the pipe. */
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rlen = len;
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if (get_ttyp ()->ti.c_oflag & OPOST && get_ttyp ()->ti.c_oflag & ONLCR)
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{
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/* We are going to expand \n to \r\n, so don't read more than
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half of the number of bytes requested. */
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rlen /= 2;
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if (rlen == 0)
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rlen = 1;
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}
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if (rlen > sizeof outbuf)
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rlen = sizeof outbuf;
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n = 0;
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for (;;)
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{
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if (!bytes_available (n))
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goto err;
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if (n)
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break;
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|
if (hit_eof ())
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goto out;
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/* DISCARD (FLUSHO) and tcflush can finish here. */
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|
if ((get_ttyp ()->ti.c_lflag & FLUSHO || !buf))
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|
goto out;
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|
if (is_nonblocking ())
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|
{
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set_errno (EAGAIN);
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rc = -1;
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goto out;
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}
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|
pthread_testcancel ();
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if (cygwait (NULL, 10, cw_sig_eintr) == WAIT_SIGNALED
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|
&& !_my_tls.call_signal_handler ())
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|
{
|
|
set_errno (EINTR);
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|
rc = -1;
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goto out;
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|
}
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flush_to_slave ();
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|
}
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|
|
if (!ReadFile (get_handle (), outbuf, rlen, &n, NULL))
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|
{
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|
termios_printf ("ReadFile failed, %E");
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|
goto err;
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|
}
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|
|
termios_printf ("bytes read %u", n);
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get_ttyp ()->write_error = 0;
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|
|
|
if (get_ttyp ()->ti.c_lflag & FLUSHO || !buf)
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|
continue;
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|
|
|
char *optr;
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optr = buf;
|
|
if (pktmode_on)
|
|
*optr++ = TIOCPKT_DATA;
|
|
|
|
if (!(get_ttyp ()->ti.c_oflag & OPOST)) // post-process output
|
|
{
|
|
memcpy (optr, outbuf, n);
|
|
optr += n;
|
|
}
|
|
else // raw output mode
|
|
{
|
|
char *iptr = outbuf;
|
|
|
|
while (n--)
|
|
{
|
|
switch (*iptr)
|
|
{
|
|
case '\r':
|
|
if ((get_ttyp ()->ti.c_oflag & ONOCR) && column == 0)
|
|
{
|
|
iptr++;
|
|
continue;
|
|
}
|
|
if (get_ttyp ()->ti.c_oflag & OCRNL)
|
|
*iptr = '\n';
|
|
else
|
|
column = 0;
|
|
break;
|
|
case '\n':
|
|
if (get_ttyp ()->ti.c_oflag & ONLCR)
|
|
{
|
|
*optr++ = '\r';
|
|
column = 0;
|
|
}
|
|
if (get_ttyp ()->ti.c_oflag & ONLRET)
|
|
column = 0;
|
|
break;
|
|
default:
|
|
column++;
|
|
break;
|
|
}
|
|
|
|
/* Don't store data past the end of the user's buffer. This
|
|
can happen if the user requests a read of 1 byte when
|
|
doing \r\n expansion. */
|
|
if (optr - buf >= (int) len)
|
|
{
|
|
if (*iptr != '\n' || n != 0)
|
|
system_printf ("internal error: %d unexpected characters", n);
|
|
need_nl = 1;
|
|
break;
|
|
}
|
|
|
|
*optr++ = *iptr++;
|
|
}
|
|
}
|
|
rc = optr - buf;
|
|
break;
|
|
|
|
err:
|
|
if (GetLastError () == ERROR_BROKEN_PIPE)
|
|
rc = 0;
|
|
else
|
|
{
|
|
__seterrno ();
|
|
rc = -1;
|
|
}
|
|
break;
|
|
}
|
|
|
|
out:
|
|
termios_printf ("returning %d", rc);
|
|
return rc;
|
|
}
|
|
|
|
/* pty slave stuff */
|
|
|
|
fhandler_pty_slave::fhandler_pty_slave (int unit)
|
|
: fhandler_pty_common (), inuse (NULL)
|
|
{
|
|
if (unit >= 0)
|
|
dev ().parse (DEV_PTYS_MAJOR, unit);
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::open (int flags, mode_t)
|
|
{
|
|
HANDLE pty_owner, from_master_local, to_master_local;
|
|
HANDLE *handles[] =
|
|
{
|
|
&from_master_local, &input_available_event, &input_mutex, &inuse,
|
|
&output_mutex, &to_master_local, &pty_owner,
|
|
NULL
|
|
};
|
|
|
|
for (HANDLE **h = handles; *h; h++)
|
|
**h = NULL;
|
|
|
|
_tc = cygwin_shared->tty[get_unit ()];
|
|
|
|
tcinit (false);
|
|
|
|
cygwin_shared->tty.attach (get_unit ());
|
|
|
|
/* Create synchronisation events */
|
|
char buf[MAX_PATH];
|
|
|
|
const char *errmsg = NULL;
|
|
|
|
if (!(output_mutex = get_ttyp ()->open_output_mutex (MAXIMUM_ALLOWED)))
|
|
{
|
|
errmsg = "open output mutex failed, %E";
|
|
goto err;
|
|
}
|
|
if (!(input_mutex = get_ttyp ()->open_input_mutex (MAXIMUM_ALLOWED)))
|
|
{
|
|
errmsg = "open input mutex failed, %E";
|
|
goto err;
|
|
}
|
|
shared_name (buf, INPUT_AVAILABLE_EVENT, get_unit ());
|
|
if (!(input_available_event = OpenEvent (MAXIMUM_ALLOWED, TRUE, buf)))
|
|
{
|
|
errmsg = "open input event failed, %E";
|
|
goto err;
|
|
}
|
|
|
|
/* FIXME: Needs a method to eliminate tty races */
|
|
{
|
|
/* Create security attribute. Default permissions are 0620. */
|
|
security_descriptor sd;
|
|
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
|
|
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
|
|
SECURITY_ATTRIBUTES sa = { sizeof (SECURITY_ATTRIBUTES), NULL, TRUE };
|
|
if (!create_object_sd_from_attribute (NULL, myself->uid, myself->gid,
|
|
S_IFCHR | S_IRUSR | S_IWUSR | S_IWGRP,
|
|
sd))
|
|
sa.lpSecurityDescriptor = (PSECURITY_DESCRIPTOR) sd;
|
|
acquire_output_mutex (500);
|
|
inuse = get_ttyp ()->create_inuse (&sa);
|
|
get_ttyp ()->was_opened = true;
|
|
release_output_mutex ();
|
|
}
|
|
|
|
if (!get_ttyp ()->from_master || !get_ttyp ()->to_master)
|
|
{
|
|
errmsg = "pty handles have been closed";
|
|
set_errno (EACCES);
|
|
goto err_no_errno;
|
|
}
|
|
|
|
if (get_ttyp ()->is_master_closed ())
|
|
{
|
|
errmsg = "*** master is closed";
|
|
set_errno (EAGAIN);
|
|
goto err_no_errno;
|
|
}
|
|
/* Three case for duplicating the pipe handles:
|
|
- Either we're the master. In this case, just duplicate the handles.
|
|
- Or, we have the right to open the master process for handle duplication.
|
|
In this case, just duplicate the handles.
|
|
- Or, we have to ask the master process itself. In this case, send our
|
|
pid to the master process and check the reply. The reply contains
|
|
either the handles, or an error code which tells us why we didn't
|
|
get the handles. */
|
|
if (myself->pid == get_ttyp ()->master_pid)
|
|
{
|
|
/* This is the most common case, just calling openpty. */
|
|
termios_printf ("dup handles within myself.");
|
|
pty_owner = GetCurrentProcess ();
|
|
}
|
|
else
|
|
{
|
|
pinfo p (get_ttyp ()->master_pid);
|
|
if (!p)
|
|
termios_printf ("*** couldn't find pty master");
|
|
else
|
|
{
|
|
pty_owner = OpenProcess (PROCESS_DUP_HANDLE, FALSE, p->dwProcessId);
|
|
if (pty_owner)
|
|
termios_printf ("dup handles directly since I'm the owner");
|
|
}
|
|
}
|
|
if (pty_owner)
|
|
{
|
|
if (!DuplicateHandle (pty_owner, get_ttyp ()->from_master,
|
|
GetCurrentProcess (), &from_master_local, 0, TRUE,
|
|
DUPLICATE_SAME_ACCESS))
|
|
{
|
|
termios_printf ("can't duplicate input from %u/%p, %E",
|
|
get_ttyp ()->master_pid, get_ttyp ()->from_master);
|
|
__seterrno ();
|
|
goto err_no_msg;
|
|
}
|
|
if (!DuplicateHandle (pty_owner, get_ttyp ()->to_master,
|
|
GetCurrentProcess (), &to_master_local, 0, TRUE,
|
|
DUPLICATE_SAME_ACCESS))
|
|
{
|
|
errmsg = "can't duplicate output, %E";
|
|
goto err;
|
|
}
|
|
if (pty_owner != GetCurrentProcess ())
|
|
CloseHandle (pty_owner);
|
|
}
|
|
else
|
|
{
|
|
pipe_request req = { GetCurrentProcessId () };
|
|
pipe_reply repl;
|
|
DWORD len;
|
|
|
|
__small_sprintf (buf, "\\\\.\\pipe\\cygwin-%S-pty%d-master-ctl",
|
|
&cygheap->installation_key, get_unit ());
|
|
termios_printf ("dup handles via master control pipe %s", buf);
|
|
if (!CallNamedPipe (buf, &req, sizeof req, &repl, sizeof repl,
|
|
&len, 500))
|
|
{
|
|
errmsg = "can't call master, %E";
|
|
goto err;
|
|
}
|
|
from_master_local = repl.from_master;
|
|
to_master_local = repl.to_master;
|
|
if (!from_master_local || !to_master_local)
|
|
{
|
|
SetLastError (repl.error);
|
|
errmsg = "error duplicating pipes, %E";
|
|
goto err;
|
|
}
|
|
}
|
|
VerifyHandle (from_master_local);
|
|
VerifyHandle (to_master_local);
|
|
|
|
termios_printf ("duplicated from_master %p->%p from pty_owner",
|
|
get_ttyp ()->from_master, from_master_local);
|
|
termios_printf ("duplicated to_master %p->%p from pty_owner",
|
|
get_ttyp ()->to_master, to_master_local);
|
|
|
|
set_io_handle (from_master_local);
|
|
set_output_handle (to_master_local);
|
|
|
|
fhandler_console::need_invisible ();
|
|
set_open_status ();
|
|
return 1;
|
|
|
|
err:
|
|
if (GetLastError () == ERROR_FILE_NOT_FOUND)
|
|
set_errno (ENXIO);
|
|
else
|
|
__seterrno ();
|
|
err_no_errno:
|
|
termios_printf (errmsg);
|
|
err_no_msg:
|
|
for (HANDLE **h = handles; *h; h++)
|
|
if (**h && **h != INVALID_HANDLE_VALUE)
|
|
CloseHandle (**h);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_pty_slave::open_setup (int flags)
|
|
{
|
|
set_flags ((flags & ~O_TEXT) | O_BINARY);
|
|
myself->set_ctty (this, flags);
|
|
report_tty_counts (this, "opened", "");
|
|
}
|
|
|
|
void
|
|
fhandler_pty_slave::cleanup ()
|
|
{
|
|
/* This used to always call fhandler_pty_common::close when we were execing
|
|
but that caused multiple closes of the handles associated with this pty.
|
|
Since close_all_files is not called until after the cygwin process has
|
|
synced or before a non-cygwin process has exited, it should be safe to
|
|
just close this normally. cgf 2006-05-20 */
|
|
report_tty_counts (this, "closed", "");
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::close ()
|
|
{
|
|
termios_printf ("closing last open %s handle", ttyname ());
|
|
if (inuse && !CloseHandle (inuse))
|
|
termios_printf ("CloseHandle (inuse), %E");
|
|
if (!ForceCloseHandle (input_available_event))
|
|
termios_printf ("CloseHandle (input_available_event<%p>), %E", input_available_event);
|
|
if ((unsigned) myself->ctty == FHDEV (DEV_PTYS_MAJOR, get_unit ()))
|
|
fhandler_console::free_console (); /* assumes that we are the last pty closer */
|
|
return fhandler_pty_common::close ();
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::init (HANDLE h, DWORD a, mode_t)
|
|
{
|
|
int flags = 0;
|
|
|
|
a &= GENERIC_READ | GENERIC_WRITE;
|
|
if (a == GENERIC_READ)
|
|
flags = O_RDONLY;
|
|
if (a == GENERIC_WRITE)
|
|
flags = O_WRONLY;
|
|
if (a == (GENERIC_READ | GENERIC_WRITE))
|
|
flags = O_RDWR;
|
|
|
|
int ret = open_with_arch (flags);
|
|
|
|
if (ret && !cygwin_finished_initializing && !being_debugged ())
|
|
{
|
|
/* This only occurs when called from dtable::init_std_file_from_handle
|
|
We have been started from a non-Cygwin process. So we should become
|
|
pty process group leader.
|
|
TODO: Investigate how SIGTTIN should be handled with pure-windows
|
|
programs. */
|
|
pinfo p (tc ()->getpgid ());
|
|
/* We should only grab this when the process group owner for this
|
|
pty is a non-cygwin process or we've been started directly
|
|
from a non-Cygwin process with no Cygwin ancestry. */
|
|
if (!p || ISSTATE (p, PID_NOTCYGWIN))
|
|
{
|
|
termios_printf ("Setting process group leader to %d since %W(%d) is not a cygwin process",
|
|
myself->pgid, p->progname, p->pid);
|
|
tc ()->setpgid (myself->pgid);
|
|
}
|
|
}
|
|
|
|
if (h != INVALID_HANDLE_VALUE)
|
|
CloseHandle (h); /* Reopened by open */
|
|
|
|
return ret;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_pty_slave::write (const void *ptr, size_t len)
|
|
{
|
|
DWORD n, towrite = len;
|
|
|
|
bg_check_types bg = bg_check (SIGTTOU);
|
|
if (bg <= bg_eof)
|
|
return (ssize_t) bg;
|
|
|
|
termios_printf ("pty%d, write(%x, %d)", get_unit (), ptr, len);
|
|
|
|
push_process_state process_state (PID_TTYOU);
|
|
|
|
while (len)
|
|
{
|
|
n = MIN (OUT_BUFFER_SIZE, len);
|
|
char *buf = (char *)ptr;
|
|
ptr = (char *) ptr + n;
|
|
len -= n;
|
|
|
|
while (tc ()->output_stopped)
|
|
cygwait (10);
|
|
acquire_output_mutex (INFINITE);
|
|
|
|
/* Previous write may have set write_error to != 0. Check it here.
|
|
This is less than optimal, but the alternative slows down pty
|
|
writes enormously. */
|
|
if (get_ttyp ()->write_error)
|
|
{
|
|
set_errno (get_ttyp ()->write_error);
|
|
towrite = (DWORD) -1;
|
|
get_ttyp ()->write_error = 0;
|
|
release_output_mutex ();
|
|
break;
|
|
}
|
|
|
|
BOOL res = WriteFile (get_output_handle (), buf, n, &n, NULL);
|
|
release_output_mutex ();
|
|
if (!res)
|
|
{
|
|
DWORD err = GetLastError ();
|
|
termios_printf ("WriteFile failed, %E");
|
|
switch (err)
|
|
{
|
|
case ERROR_NO_DATA:
|
|
err = ERROR_IO_DEVICE;
|
|
default:
|
|
__seterrno_from_win_error (err);
|
|
}
|
|
raise (SIGHUP); /* FIXME: Should this be SIGTTOU? */
|
|
towrite = (DWORD) -1;
|
|
break;
|
|
}
|
|
}
|
|
return towrite;
|
|
}
|
|
|
|
void __stdcall
|
|
fhandler_pty_slave::read (void *ptr, size_t& len)
|
|
{
|
|
int totalread = 0;
|
|
int vmin = 0;
|
|
int vtime = 0; /* Initialized to prevent -Wuninitialized warning */
|
|
size_t readlen;
|
|
DWORD bytes_in_pipe;
|
|
char buf[INP_BUFFER_SIZE];
|
|
DWORD time_to_wait;
|
|
|
|
bg_check_types bg = bg_check (SIGTTIN);
|
|
if (bg <= bg_eof)
|
|
{
|
|
len = (size_t) bg;
|
|
return;
|
|
}
|
|
|
|
termios_printf ("read(%x, %d) handle %p", ptr, len, get_handle ());
|
|
|
|
push_process_state process_state (PID_TTYIN);
|
|
|
|
if (is_nonblocking () || !ptr) /* Indicating tcflush(). */
|
|
time_to_wait = 0;
|
|
else if ((get_ttyp ()->ti.c_lflag & ICANON))
|
|
time_to_wait = INFINITE;
|
|
else
|
|
{
|
|
vmin = get_ttyp ()->ti.c_cc[VMIN];
|
|
if (vmin > INP_BUFFER_SIZE)
|
|
vmin = INP_BUFFER_SIZE;
|
|
vtime = get_ttyp ()->ti.c_cc[VTIME];
|
|
if (vmin < 0)
|
|
vmin = 0;
|
|
if (vtime < 0)
|
|
vtime = 0;
|
|
if (!vmin && !vtime)
|
|
time_to_wait = 0;
|
|
else
|
|
time_to_wait = !vtime ? INFINITE : 100 * vtime;
|
|
}
|
|
|
|
while (len)
|
|
{
|
|
switch (cygwait (input_available_event, time_to_wait))
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
if (get_ttyp ()->is_master_closed ())
|
|
{
|
|
raise (SIGHUP);
|
|
totalread = 0;
|
|
goto out;
|
|
}
|
|
break;
|
|
case WAIT_SIGNALED:
|
|
if (totalread > 0)
|
|
goto out;
|
|
termios_printf ("wait catched signal");
|
|
set_sig_errno (EINTR);
|
|
totalread = -1;
|
|
goto out;
|
|
case WAIT_CANCELED:
|
|
process_state.pop ();
|
|
pthread::static_cancel_self ();
|
|
/*NOTREACHED*/
|
|
case WAIT_TIMEOUT:
|
|
termios_printf ("wait timed out, time_to_wait %u", time_to_wait);
|
|
if (!totalread)
|
|
{
|
|
set_sig_errno (EAGAIN);
|
|
totalread = -1;
|
|
}
|
|
goto out;
|
|
default:
|
|
termios_printf ("wait for input event failed, %E");
|
|
if (!totalread)
|
|
{
|
|
__seterrno ();
|
|
totalread = -1;
|
|
}
|
|
goto out;
|
|
}
|
|
/* Now that we know that input is available we have to grab the
|
|
input mutex. */
|
|
switch (cygwait (input_mutex, 1000))
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
case WAIT_ABANDONED_0:
|
|
break;
|
|
case WAIT_SIGNALED:
|
|
if (totalread > 0)
|
|
goto out;
|
|
termios_printf ("wait for mutex caught signal");
|
|
set_sig_errno (EINTR);
|
|
totalread = -1;
|
|
goto out;
|
|
case WAIT_CANCELED:
|
|
process_state.pop ();
|
|
pthread::static_cancel_self ();
|
|
/*NOTREACHED*/
|
|
case WAIT_TIMEOUT:
|
|
termios_printf ("failed to acquire input mutex after input event "
|
|
"arrived");
|
|
/* If we have a timeout, we can simply handle this failure to
|
|
grab the mutex as an EAGAIN situation. Otherwise, if this
|
|
is an infinitely blocking read, restart the loop. */
|
|
if (time_to_wait != INFINITE)
|
|
{
|
|
if (!totalread)
|
|
{
|
|
set_sig_errno (EAGAIN);
|
|
totalread = -1;
|
|
}
|
|
goto out;
|
|
}
|
|
continue;
|
|
default:
|
|
termios_printf ("wait for input mutex failed, %E");
|
|
if (!totalread)
|
|
{
|
|
__seterrno ();
|
|
totalread = -1;
|
|
}
|
|
goto out;
|
|
}
|
|
if (!bytes_available (bytes_in_pipe))
|
|
raise (SIGHUP);
|
|
|
|
/* On first peek determine no. of bytes to flush. */
|
|
if (!ptr && len == UINT_MAX)
|
|
len = (size_t) bytes_in_pipe;
|
|
|
|
if (ptr && !bytes_in_pipe && !vmin && !time_to_wait)
|
|
{
|
|
ReleaseMutex (input_mutex);
|
|
len = (size_t) bytes_in_pipe;
|
|
return;
|
|
}
|
|
|
|
readlen = MIN (bytes_in_pipe, MIN (len, sizeof (buf)));
|
|
|
|
if (ptr && vmin && readlen > (unsigned) vmin)
|
|
readlen = vmin;
|
|
|
|
DWORD n = 0;
|
|
if (readlen)
|
|
{
|
|
termios_printf ("reading %d bytes (vtime %d)", readlen, vtime);
|
|
if (!ReadFile (get_handle (), buf, readlen, &n, NULL))
|
|
{
|
|
termios_printf ("read failed, %E");
|
|
raise (SIGHUP);
|
|
bytes_in_pipe = 0;
|
|
ptr = NULL;
|
|
}
|
|
else
|
|
{
|
|
/* MSDN states that 5th prameter can be used to determine total
|
|
number of bytes in pipe, but for some reason this number doesn't
|
|
change after successful read. So we have to peek into the pipe
|
|
again to see if input is still available */
|
|
if (!bytes_available (bytes_in_pipe))
|
|
raise (SIGHUP);
|
|
if (n)
|
|
{
|
|
len -= n;
|
|
totalread += n;
|
|
if (ptr)
|
|
{
|
|
memcpy (ptr, buf, n);
|
|
ptr = (char *) ptr + n;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!bytes_in_pipe)
|
|
ResetEvent (input_available_event);
|
|
|
|
ReleaseMutex (input_mutex);
|
|
|
|
if (!ptr)
|
|
{
|
|
if (!bytes_in_pipe)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
if (get_ttyp ()->read_retval < 0) // read error
|
|
{
|
|
set_errno (-get_ttyp ()->read_retval);
|
|
totalread = -1;
|
|
break;
|
|
}
|
|
if (get_ttyp ()->read_retval == 0) //EOF
|
|
{
|
|
termios_printf ("saw EOF");
|
|
break;
|
|
}
|
|
if (get_ttyp ()->ti.c_lflag & ICANON || is_nonblocking ())
|
|
break;
|
|
if (vmin && totalread >= vmin)
|
|
break;
|
|
|
|
/* vmin == 0 && vtime == 0:
|
|
* we've already read all input, if any, so return immediately
|
|
* vmin == 0 && vtime > 0:
|
|
* we've waited for input 10*vtime ms in WFSO(input_available_event),
|
|
* no matter whether any input arrived, we shouldn't wait any longer,
|
|
* so return immediately
|
|
* vmin > 0 && vtime == 0:
|
|
* here, totalread < vmin, so continue waiting until more data
|
|
* arrive
|
|
* vmin > 0 && vtime > 0:
|
|
* similar to the previous here, totalread < vmin, and timer
|
|
* hadn't expired -- WFSO(input_available_event) != WAIT_TIMEOUT,
|
|
* so "restart timer" and wait until more data arrive
|
|
*/
|
|
|
|
if (vmin == 0)
|
|
break;
|
|
}
|
|
out:
|
|
termios_printf ("%d=read(%x, %d)", totalread, ptr, len);
|
|
len = (size_t) totalread;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::dup (fhandler_base *child, int flags)
|
|
{
|
|
/* This code was added in Oct 2001 for some undisclosed reason.
|
|
However, setting the controlling tty on a dup causes rxvt to
|
|
hang when the parent does a dup since the controlling pgid changes.
|
|
Specifically testing for -2 (ctty has been setsid'ed) works around
|
|
this problem. However, it's difficult to see scenarios in which you
|
|
have a dup'able fd, no controlling tty, and not having run setsid.
|
|
So, we might want to consider getting rid of the set_ctty in tty-like dup
|
|
methods entirely at some point */
|
|
if (myself->ctty != -2)
|
|
myself->set_ctty (this, flags);
|
|
report_tty_counts (child, "duped slave", "");
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::dup (fhandler_base *child, int)
|
|
{
|
|
report_tty_counts (child, "duped master", "");
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::tcgetattr (struct termios *t)
|
|
{
|
|
*t = get_ttyp ()->ti;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::tcsetattr (int, const struct termios *t)
|
|
{
|
|
acquire_output_mutex (INFINITE);
|
|
get_ttyp ()->ti = *t;
|
|
release_output_mutex ();
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::tcflush (int queue)
|
|
{
|
|
int ret = 0;
|
|
|
|
termios_printf ("tcflush(%d) handle %p", queue, get_handle ());
|
|
|
|
if (queue == TCIFLUSH || queue == TCIOFLUSH)
|
|
{
|
|
size_t len = UINT_MAX;
|
|
read (NULL, len);
|
|
ret = ((int) len) >= 0 ? 0 : -1;
|
|
}
|
|
if (queue == TCOFLUSH || queue == TCIOFLUSH)
|
|
{
|
|
/* do nothing for now. */
|
|
}
|
|
|
|
termios_printf ("%d=tcflush(%d)", ret, queue);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_slave::ioctl (unsigned int cmd, void *arg)
|
|
{
|
|
termios_printf ("ioctl (%x)", cmd);
|
|
int res = fhandler_termios::ioctl (cmd, arg);
|
|
if (res <= 0)
|
|
return res;
|
|
|
|
if (myself->pgid && get_ttyp ()->getpgid () != myself->pgid
|
|
&& (unsigned) myself->ctty == FHDEV (DEV_PTYS_MAJOR, get_unit ())
|
|
&& (get_ttyp ()->ti.c_lflag & TOSTOP))
|
|
{
|
|
/* background process */
|
|
termios_printf ("bg ioctl pgid %d, tpgid %d, %s", myself->pgid,
|
|
get_ttyp ()->getpgid (), myctty ());
|
|
raise (SIGTTOU);
|
|
}
|
|
|
|
int retval;
|
|
switch (cmd)
|
|
{
|
|
case TIOCGWINSZ:
|
|
case TIOCSWINSZ:
|
|
break;
|
|
case TIOCGPGRP:
|
|
{
|
|
pid_t pid = this->tcgetpgrp ();
|
|
if (pid < 0)
|
|
retval = -1;
|
|
else
|
|
{
|
|
*((pid_t *) arg) = pid;
|
|
retval = 0;
|
|
}
|
|
}
|
|
goto out;
|
|
case TIOCSPGRP:
|
|
retval = this->tcsetpgrp ((pid_t) arg);
|
|
goto out;
|
|
case FIONREAD:
|
|
{
|
|
DWORD n;
|
|
if (!bytes_available (n))
|
|
{
|
|
set_errno (EINVAL);
|
|
retval = -1;
|
|
}
|
|
else
|
|
{
|
|
*(int *) arg = (int) n;
|
|
retval = 0;
|
|
}
|
|
}
|
|
goto out;
|
|
default:
|
|
return fhandler_base::ioctl (cmd, arg);
|
|
}
|
|
|
|
acquire_output_mutex (INFINITE);
|
|
|
|
get_ttyp ()->cmd = cmd;
|
|
get_ttyp ()->ioctl_retval = 0;
|
|
switch (cmd)
|
|
{
|
|
case TIOCGWINSZ:
|
|
get_ttyp ()->arg.winsize = get_ttyp ()->winsize;
|
|
*(struct winsize *) arg = get_ttyp ()->arg.winsize;
|
|
get_ttyp ()->winsize = get_ttyp ()->arg.winsize;
|
|
break;
|
|
case TIOCSWINSZ:
|
|
if (get_ttyp ()->winsize.ws_row != ((struct winsize *) arg)->ws_row
|
|
|| get_ttyp ()->winsize.ws_col != ((struct winsize *) arg)->ws_col)
|
|
{
|
|
get_ttyp ()->arg.winsize = *(struct winsize *) arg;
|
|
get_ttyp ()->winsize = *(struct winsize *) arg;
|
|
killsys (-get_ttyp ()->getpgid (), SIGWINCH);
|
|
}
|
|
break;
|
|
}
|
|
|
|
release_output_mutex ();
|
|
retval = get_ttyp ()->ioctl_retval;
|
|
if (retval < 0)
|
|
{
|
|
set_errno (-retval);
|
|
retval = -1;
|
|
}
|
|
|
|
out:
|
|
termios_printf ("%d = ioctl(%x)", retval, cmd);
|
|
return retval;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_pty_slave::fstat (struct __stat64 *st)
|
|
{
|
|
fhandler_base::fstat (st);
|
|
|
|
bool to_close = false;
|
|
if (!input_available_event)
|
|
{
|
|
char buf[MAX_PATH];
|
|
shared_name (buf, INPUT_AVAILABLE_EVENT, get_unit ());
|
|
input_available_event = OpenEvent (READ_CONTROL, TRUE, buf);
|
|
if (input_available_event)
|
|
to_close = true;
|
|
}
|
|
if (!input_available_event
|
|
|| get_object_attribute (input_available_event, &st->st_uid, &st->st_gid,
|
|
&st->st_mode))
|
|
{
|
|
/* If we can't access the ACL, or if the tty doesn't actually exist,
|
|
then fake uid and gid to strict, system-like values. */
|
|
st->st_mode = S_IFCHR | S_IRUSR | S_IWUSR;
|
|
st->st_uid = 18;
|
|
st->st_gid = 544;
|
|
}
|
|
if (to_close)
|
|
CloseHandle (input_available_event);
|
|
return 0;
|
|
}
|
|
|
|
/* Helper function for fchmod and fchown, which just opens all handles
|
|
and signals success via bool return. */
|
|
bool
|
|
fhandler_pty_slave::fch_open_handles ()
|
|
{
|
|
char buf[MAX_PATH];
|
|
|
|
_tc = cygwin_shared->tty[get_unit ()];
|
|
shared_name (buf, INPUT_AVAILABLE_EVENT, get_unit ());
|
|
input_available_event = OpenEvent (READ_CONTROL | WRITE_DAC | WRITE_OWNER,
|
|
TRUE, buf);
|
|
output_mutex = get_ttyp ()->open_output_mutex (WRITE_DAC | WRITE_OWNER);
|
|
input_mutex = get_ttyp ()->open_input_mutex (WRITE_DAC | WRITE_OWNER);
|
|
inuse = get_ttyp ()->open_inuse (WRITE_DAC | WRITE_OWNER);
|
|
if (!input_available_event || !output_mutex || !input_mutex || !inuse)
|
|
{
|
|
__seterrno ();
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Helper function for fchmod and fchown, which sets the new security
|
|
descriptor on all objects representing the pty. */
|
|
int
|
|
fhandler_pty_slave::fch_set_sd (security_descriptor &sd, bool chown)
|
|
{
|
|
security_descriptor sd_old;
|
|
|
|
get_object_sd (input_available_event, sd_old);
|
|
if (!set_object_sd (input_available_event, sd, chown)
|
|
&& !set_object_sd (output_mutex, sd, chown)
|
|
&& !set_object_sd (input_mutex, sd, chown)
|
|
&& !set_object_sd (inuse, sd, chown))
|
|
return 0;
|
|
set_object_sd (input_available_event, sd_old, chown);
|
|
set_object_sd (output_mutex, sd_old, chown);
|
|
set_object_sd (input_mutex, sd_old, chown);
|
|
set_object_sd (inuse, sd_old, chown);
|
|
return -1;
|
|
}
|
|
|
|
/* Helper function for fchmod and fchown, which closes all object handles in
|
|
the pty. */
|
|
void
|
|
fhandler_pty_slave::fch_close_handles ()
|
|
{
|
|
close_maybe (get_io_handle ());
|
|
close_maybe (get_output_handle ());
|
|
close_maybe (input_available_event);
|
|
close_maybe (output_mutex);
|
|
close_maybe (input_mutex);
|
|
close_maybe (inuse);
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_pty_slave::fchmod (mode_t mode)
|
|
{
|
|
int ret = -1;
|
|
bool to_close = false;
|
|
security_descriptor sd;
|
|
__uid32_t uid;
|
|
__gid32_t gid;
|
|
|
|
if (!input_available_event)
|
|
{
|
|
to_close = true;
|
|
if (!fch_open_handles ())
|
|
goto errout;
|
|
}
|
|
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
|
|
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
|
|
if (!get_object_attribute (input_available_event, &uid, &gid, NULL)
|
|
&& !create_object_sd_from_attribute (NULL, uid, gid, S_IFCHR | mode, sd))
|
|
ret = fch_set_sd (sd, false);
|
|
errout:
|
|
if (to_close)
|
|
fch_close_handles ();
|
|
return ret;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_pty_slave::fchown (__uid32_t uid, __gid32_t gid)
|
|
{
|
|
int ret = -1;
|
|
bool to_close = false;
|
|
mode_t mode = 0;
|
|
__uid32_t o_uid;
|
|
__gid32_t o_gid;
|
|
security_descriptor sd;
|
|
|
|
if (uid == ILLEGAL_UID && gid == ILLEGAL_GID)
|
|
return 0;
|
|
if (!input_available_event)
|
|
{
|
|
to_close = true;
|
|
if (!fch_open_handles ())
|
|
goto errout;
|
|
}
|
|
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
|
|
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
|
|
if (!get_object_attribute (input_available_event, &o_uid, &o_gid, &mode))
|
|
{
|
|
if ((uid == ILLEGAL_UID || uid == o_uid)
|
|
&& (gid == ILLEGAL_GID || gid == o_gid))
|
|
ret = 0;
|
|
else if (!create_object_sd_from_attribute (input_available_event,
|
|
uid, gid, S_IFCHR | mode, sd))
|
|
ret = fch_set_sd (sd, true);
|
|
}
|
|
errout:
|
|
if (to_close)
|
|
fch_close_handles ();
|
|
return ret;
|
|
}
|
|
|
|
/*******************************************************
|
|
fhandler_pty_master
|
|
*/
|
|
fhandler_pty_master::fhandler_pty_master (int unit)
|
|
: fhandler_pty_common (), pktmode (0), master_ctl (NULL),
|
|
master_thread (NULL), from_master (NULL), to_master (NULL),
|
|
dwProcessId (0), need_nl (0)
|
|
{
|
|
if (unit >= 0)
|
|
dev ().parse (DEV_PTYM_MAJOR, unit);
|
|
else if (!setup ())
|
|
{
|
|
dev ().parse (FH_ERROR);
|
|
return;
|
|
}
|
|
set_name ("/dev/ptmx");
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::open (int flags, mode_t)
|
|
{
|
|
set_open_status ();
|
|
dwProcessId = GetCurrentProcessId ();
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
fhandler_pty_master::open_setup (int flags)
|
|
{
|
|
set_flags ((flags & ~O_TEXT) | O_BINARY);
|
|
char buf[sizeof ("opened pty master for ptyNNNNNNNNNNN")];
|
|
__small_sprintf (buf, "opened pty master for pty%d", get_unit ());
|
|
report_tty_counts (this, buf, "");
|
|
}
|
|
|
|
_off64_t
|
|
fhandler_pty_common::lseek (_off64_t, int)
|
|
{
|
|
set_errno (ESPIPE);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_common::close ()
|
|
{
|
|
termios_printf ("pty%d <%p,%p> closing", get_unit (), get_handle (), get_output_handle ());
|
|
if (!ForceCloseHandle (input_mutex))
|
|
termios_printf ("CloseHandle (input_mutex<%p>), %E", input_mutex);
|
|
if (!ForceCloseHandle (output_mutex))
|
|
termios_printf ("CloseHandle (output_mutex<%p>), %E", output_mutex);
|
|
if (!ForceCloseHandle1 (get_handle (), from_pty))
|
|
termios_printf ("CloseHandle (get_handle ()<%p>), %E", get_handle ());
|
|
if (!ForceCloseHandle1 (get_output_handle (), to_pty))
|
|
termios_printf ("CloseHandle (get_output_handle ()<%p>), %E", get_output_handle ());
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_pty_master::cleanup ()
|
|
{
|
|
report_tty_counts (this, "closing master", "");
|
|
if (archetype)
|
|
from_master = to_master = NULL;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::close ()
|
|
{
|
|
termios_printf ("closing from_master(%p)/to_master(%p) since we own them(%d)",
|
|
from_master, to_master, dwProcessId);
|
|
if (cygwin_finished_initializing)
|
|
{
|
|
if (master_ctl && get_ttyp ()->master_pid == myself->pid)
|
|
{
|
|
char buf[MAX_PATH];
|
|
pipe_request req = { (DWORD) -1 };
|
|
pipe_reply repl;
|
|
DWORD len;
|
|
|
|
__small_sprintf (buf, "\\\\.\\pipe\\cygwin-%S-pty%d-master-ctl",
|
|
&cygheap->installation_key, get_unit ());
|
|
CallNamedPipe (buf, &req, sizeof req, &repl, sizeof repl, &len, 500);
|
|
CloseHandle (master_ctl);
|
|
master_thread->detach ();
|
|
}
|
|
}
|
|
|
|
if (!ForceCloseHandle (from_master))
|
|
termios_printf ("error closing from_master %p, %E", from_master);
|
|
if (!ForceCloseHandle (to_master))
|
|
termios_printf ("error closing from_master %p, %E", to_master);
|
|
from_master = to_master = NULL;
|
|
|
|
fhandler_pty_common::close ();
|
|
|
|
if (have_execed || get_ttyp ()->master_pid != myself->pid)
|
|
termios_printf ("not clearing: %d, master_pid %d", have_execed, get_ttyp ()->master_pid);
|
|
else
|
|
{
|
|
get_ttyp ()->set_master_closed ();
|
|
SetEvent (input_available_event);
|
|
}
|
|
if (!ForceCloseHandle (input_available_event))
|
|
termios_printf ("CloseHandle (input_available_event<%p>), %E", input_available_event);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This is just to catch error conditions. Since the constructor
|
|
actually opens some handles, and stat() does not open an fd, they need
|
|
to be closed when the fhandler goes away. */
|
|
fhandler_pty_master::~fhandler_pty_master ()
|
|
{
|
|
if (from_master && to_master)
|
|
close_with_arch ();
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_pty_master::write (const void *ptr, size_t len)
|
|
{
|
|
int i;
|
|
char *p = (char *) ptr;
|
|
termios ti = tc ()->ti;
|
|
|
|
bg_check_types bg = bg_check (SIGTTOU);
|
|
if (bg <= bg_eof)
|
|
return (ssize_t) bg;
|
|
|
|
push_process_state process_state (PID_TTYOU);
|
|
|
|
for (i = 0; i < (int) len; i++)
|
|
{
|
|
line_edit_status status = line_edit (p++, 1, ti);
|
|
if (status > line_edit_signalled)
|
|
{
|
|
if (status != line_edit_pipe_full)
|
|
i = -1;
|
|
break;
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void __stdcall
|
|
fhandler_pty_master::read (void *ptr, size_t& len)
|
|
{
|
|
bg_check_types bg = bg_check (SIGTTIN);
|
|
if (bg <= bg_eof)
|
|
{
|
|
len = (size_t) bg;
|
|
return;
|
|
}
|
|
push_process_state process_state (PID_TTYIN);
|
|
len = (size_t) process_slave_output ((char *) ptr, len, pktmode);
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::tcgetattr (struct termios *t)
|
|
{
|
|
*t = cygwin_shared->tty[get_unit ()]->ti;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::tcsetattr (int, const struct termios *t)
|
|
{
|
|
cygwin_shared->tty[get_unit ()]->ti = *t;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::tcflush (int queue)
|
|
{
|
|
int ret = 0;
|
|
|
|
termios_printf ("tcflush(%d) handle %p", queue, get_handle ());
|
|
|
|
if (queue == TCIFLUSH || queue == TCIOFLUSH)
|
|
ret = process_slave_output (NULL, OUT_BUFFER_SIZE, 0);
|
|
else if (queue == TCIFLUSH || queue == TCIOFLUSH)
|
|
{
|
|
/* do nothing for now. */
|
|
}
|
|
|
|
termios_printf ("%d=tcflush(%d)", ret, queue);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::ioctl (unsigned int cmd, void *arg)
|
|
{
|
|
int res = fhandler_termios::ioctl (cmd, arg);
|
|
if (res <= 0)
|
|
return res;
|
|
|
|
switch (cmd)
|
|
{
|
|
case TIOCPKT:
|
|
pktmode = *(int *) arg;
|
|
break;
|
|
case TIOCGWINSZ:
|
|
*(struct winsize *) arg = get_ttyp ()->winsize;
|
|
break;
|
|
case TIOCSWINSZ:
|
|
if (get_ttyp ()->winsize.ws_row != ((struct winsize *) arg)->ws_row
|
|
|| get_ttyp ()->winsize.ws_col != ((struct winsize *) arg)->ws_col)
|
|
{
|
|
get_ttyp ()->winsize = *(struct winsize *) arg;
|
|
killsys (-get_ttyp ()->getpgid (), SIGWINCH);
|
|
}
|
|
break;
|
|
case TIOCGPGRP:
|
|
*((pid_t *) arg) = this->tcgetpgrp ();
|
|
break;
|
|
case TIOCSPGRP:
|
|
return this->tcsetpgrp ((pid_t) arg);
|
|
case FIONREAD:
|
|
{
|
|
DWORD n;
|
|
if (!::bytes_available (n, to_master))
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
*(int *) arg = (int) n;
|
|
}
|
|
break;
|
|
default:
|
|
return fhandler_base::ioctl (cmd, arg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_pty_master::ptsname_r (char *buf, size_t buflen)
|
|
{
|
|
char tmpbuf[TTY_NAME_MAX];
|
|
|
|
__ptsname (tmpbuf, get_unit ());
|
|
if (buflen <= strlen (tmpbuf))
|
|
{
|
|
set_errno (ERANGE);
|
|
return ERANGE;
|
|
}
|
|
strcpy (buf, tmpbuf);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_pty_common::set_close_on_exec (bool val)
|
|
{
|
|
// Cygwin processes will handle this specially on exec.
|
|
close_on_exec (val);
|
|
}
|
|
|
|
void
|
|
fhandler_pty_slave::fixup_after_fork (HANDLE parent)
|
|
{
|
|
// fork_fixup (parent, inuse, "inuse");
|
|
// fhandler_pty_common::fixup_after_fork (parent);
|
|
report_tty_counts (this, "inherited", "");
|
|
}
|
|
|
|
void
|
|
fhandler_pty_slave::fixup_after_exec ()
|
|
{
|
|
if (!close_on_exec ())
|
|
fixup_after_fork (NULL);
|
|
}
|
|
|
|
#ifndef __MINGW64_VERSION_MAJOR
|
|
extern "C" BOOL WINAPI GetNamedPipeClientProcessId (HANDLE, PULONG);
|
|
#endif
|
|
|
|
/* This thread function handles the master control pipe. It waits for a
|
|
client to connect. Then it checks if the client process has permissions
|
|
to access the tty handles. If so, it opens the client process and
|
|
duplicates the handles into that process. If that fails, it sends a reply
|
|
with at least one handle set to NULL and an error code. Last but not
|
|
least, the client is disconnected and the thread waits for the next client.
|
|
|
|
A special case is when the master side of the tty is about to be closed.
|
|
The client side is the fhandler_pty_master::close function and it sends
|
|
a PID -1 in that case. On Vista and later a check is performed that the
|
|
request to leave really comes from the master process itself. On earlier
|
|
OSes there's no function to check for the PID of the client process so
|
|
we have to trust the client side.
|
|
|
|
Since there's always only one pipe instance, there's a chance that clients
|
|
have to wait to connect to the master control pipe. Therefore the client
|
|
calls to CallNamedPipe should have a big enough timeout value. For now this
|
|
is 500ms. Hope that's enough. */
|
|
|
|
DWORD
|
|
fhandler_pty_master::pty_master_thread ()
|
|
{
|
|
bool exit = false;
|
|
GENERIC_MAPPING map = { EVENT_QUERY_STATE, EVENT_MODIFY_STATE, 0,
|
|
EVENT_QUERY_STATE | EVENT_MODIFY_STATE };
|
|
pipe_request req;
|
|
DWORD len;
|
|
security_descriptor sd;
|
|
HANDLE token;
|
|
PRIVILEGE_SET ps;
|
|
DWORD pid;
|
|
NTSTATUS status;
|
|
|
|
termios_printf ("Entered");
|
|
while (!exit && (ConnectNamedPipe (master_ctl, NULL)
|
|
|| GetLastError () == ERROR_PIPE_CONNECTED))
|
|
{
|
|
pipe_reply repl = { NULL, NULL, 0 };
|
|
bool deimp = false;
|
|
NTSTATUS allow = STATUS_ACCESS_DENIED;
|
|
ACCESS_MASK access = EVENT_MODIFY_STATE;
|
|
HANDLE client = NULL;
|
|
|
|
if (!ReadFile (master_ctl, &req, sizeof req, &len, NULL))
|
|
{
|
|
termios_printf ("ReadFile, %E");
|
|
goto reply;
|
|
}
|
|
/* This function is only available since Vista, unfortunately.
|
|
In earlier OSes we simply have to believe that the client
|
|
has no malicious intent (== sends arbitrary PIDs). */
|
|
if (!GetNamedPipeClientProcessId (master_ctl, &pid))
|
|
pid = req.pid;
|
|
if (get_object_sd (input_available_event, sd))
|
|
{
|
|
termios_printf ("get_object_sd, %E");
|
|
goto reply;
|
|
}
|
|
cygheap->user.deimpersonate ();
|
|
deimp = true;
|
|
if (!ImpersonateNamedPipeClient (master_ctl))
|
|
{
|
|
termios_printf ("ImpersonateNamedPipeClient, %E");
|
|
goto reply;
|
|
}
|
|
status = NtOpenThreadToken (GetCurrentThread (), TOKEN_QUERY, TRUE,
|
|
&token);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
termios_printf ("NtOpenThreadToken, %p", status);
|
|
SetLastError (RtlNtStatusToDosError (status));
|
|
goto reply;
|
|
}
|
|
len = sizeof ps;
|
|
status = NtAccessCheck (sd, token, access, &map, &ps, &len, &access,
|
|
&allow);
|
|
NtClose (token);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
termios_printf ("NtAccessCheck, %p", status);
|
|
SetLastError (RtlNtStatusToDosError (status));
|
|
goto reply;
|
|
}
|
|
if (!RevertToSelf ())
|
|
{
|
|
termios_printf ("RevertToSelf, %E");
|
|
goto reply;
|
|
}
|
|
if (req.pid == (DWORD) -1) /* Request to finish thread. */
|
|
{
|
|
/* Pre-Vista: Just believe in the good of the client process.
|
|
Post-Vista: Check if the requesting process is the master
|
|
process itself. */
|
|
if (pid == (DWORD) -1 || pid == GetCurrentProcessId ())
|
|
exit = true;
|
|
goto reply;
|
|
}
|
|
if (NT_SUCCESS (allow))
|
|
{
|
|
client = OpenProcess (PROCESS_DUP_HANDLE, FALSE, pid);
|
|
if (!client)
|
|
{
|
|
termios_printf ("OpenProcess, %E");
|
|
goto reply;
|
|
}
|
|
if (!DuplicateHandle (GetCurrentProcess (), from_master,
|
|
client, &repl.from_master,
|
|
0, TRUE, DUPLICATE_SAME_ACCESS))
|
|
{
|
|
termios_printf ("DuplicateHandle (from_master), %E");
|
|
goto reply;
|
|
}
|
|
if (!DuplicateHandle (GetCurrentProcess (), to_master,
|
|
client, &repl.to_master,
|
|
0, TRUE, DUPLICATE_SAME_ACCESS))
|
|
{
|
|
termios_printf ("DuplicateHandle (to_master), %E");
|
|
goto reply;
|
|
}
|
|
}
|
|
reply:
|
|
repl.error = GetLastError ();
|
|
if (client)
|
|
CloseHandle (client);
|
|
if (deimp)
|
|
cygheap->user.reimpersonate ();
|
|
sd.free ();
|
|
termios_printf ("Reply: from %p, to %p, error %lu",
|
|
repl.from_master, repl.to_master, repl.error );
|
|
if (!WriteFile (master_ctl, &repl, sizeof repl, &len, NULL))
|
|
termios_printf ("WriteFile, %E");
|
|
if (!DisconnectNamedPipe (master_ctl))
|
|
termios_printf ("DisconnectNamedPipe, %E");
|
|
}
|
|
termios_printf ("Leaving");
|
|
return 0;
|
|
}
|
|
|
|
static DWORD WINAPI
|
|
pty_master_thread (VOID *arg)
|
|
{
|
|
return ((fhandler_pty_master *) arg)->pty_master_thread ();
|
|
}
|
|
|
|
bool
|
|
fhandler_pty_master::setup ()
|
|
{
|
|
int res;
|
|
security_descriptor sd;
|
|
SECURITY_ATTRIBUTES sa = { sizeof (SECURITY_ATTRIBUTES), NULL, TRUE };
|
|
|
|
/* Find an unallocated pty to use. */
|
|
int unit = cygwin_shared->tty.allocate (from_master, get_output_handle ());
|
|
if (unit < 0)
|
|
return false;
|
|
|
|
ProtectHandle1 (get_output_handle (), to_pty);
|
|
|
|
tty& t = *cygwin_shared->tty[unit];
|
|
_tc = (tty_min *) &t;
|
|
|
|
tcinit (true); /* Set termios information. Force initialization. */
|
|
|
|
const char *errstr = NULL;
|
|
DWORD pipe_mode = PIPE_NOWAIT;
|
|
|
|
if (!SetNamedPipeHandleState (get_output_handle (), &pipe_mode, NULL, NULL))
|
|
termios_printf ("can't set output_handle(%p) to non-blocking mode",
|
|
get_output_handle ());
|
|
|
|
char pipename[sizeof("ptyNNNN-from-master")];
|
|
__small_sprintf (pipename, "pty%d-to-master", unit);
|
|
res = fhandler_pipe::create (&sec_none, &get_io_handle (), &to_master,
|
|
fhandler_pty_common::pipesize, pipename, 0);
|
|
if (res)
|
|
{
|
|
errstr = "output pipe";
|
|
goto err;
|
|
}
|
|
|
|
ProtectHandle1 (get_io_handle (), from_pty);
|
|
|
|
/* Create security attribute. Default permissions are 0620. */
|
|
sd.malloc (sizeof (SECURITY_DESCRIPTOR));
|
|
RtlCreateSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
|
|
if (!create_object_sd_from_attribute (NULL, myself->uid, myself->gid,
|
|
S_IFCHR | S_IRUSR | S_IWUSR | S_IWGRP,
|
|
sd))
|
|
sa.lpSecurityDescriptor = (PSECURITY_DESCRIPTOR) sd;
|
|
|
|
/* Carefully check that the input_available_event didn't already exist.
|
|
This is a measure to make sure that the event security descriptor
|
|
isn't occupied by a malicious process. We must make sure that the
|
|
event's security descriptor is what we expect it to be. */
|
|
if (!(input_available_event = t.get_event (errstr = INPUT_AVAILABLE_EVENT,
|
|
&sa, TRUE))
|
|
|| GetLastError () == ERROR_ALREADY_EXISTS)
|
|
goto err;
|
|
|
|
char buf[MAX_PATH];
|
|
errstr = shared_name (buf, OUTPUT_MUTEX, unit);
|
|
if (!(output_mutex = CreateMutex (&sa, FALSE, buf)))
|
|
goto err;
|
|
|
|
errstr = shared_name (buf, INPUT_MUTEX, unit);
|
|
if (!(input_mutex = CreateMutex (&sa, FALSE, buf)))
|
|
goto err;
|
|
|
|
/* Create master control pipe which allows the master to duplicate
|
|
the pty pipe handles to processes which deserve it. */
|
|
__small_sprintf (buf, "\\\\.\\pipe\\cygwin-%S-pty%d-master-ctl",
|
|
&cygheap->installation_key, unit);
|
|
master_ctl = CreateNamedPipe (buf, PIPE_ACCESS_DUPLEX,
|
|
PIPE_WAIT | PIPE_TYPE_MESSAGE
|
|
| PIPE_READMODE_MESSAGE, 1, 4096, 4096,
|
|
0, &sec_all_nih);
|
|
if (master_ctl == INVALID_HANDLE_VALUE)
|
|
{
|
|
errstr = "pty master control pipe";
|
|
goto err;
|
|
}
|
|
master_thread = new cygthread (::pty_master_thread, this, "ptym");
|
|
if (!master_thread)
|
|
{
|
|
errstr = "pty master control thread";
|
|
goto err;
|
|
}
|
|
|
|
t.from_master = from_master;
|
|
t.to_master = to_master;
|
|
t.winsize.ws_col = 80;
|
|
t.winsize.ws_row = 25;
|
|
t.master_pid = myself->pid;
|
|
|
|
dev ().parse (DEV_PTYM_MAJOR, unit);
|
|
|
|
termios_printf ("this %p, pty%d opened - from_pty %p, to_pty %p", this, unit,
|
|
get_io_handle (), get_output_handle ());
|
|
return true;
|
|
|
|
err:
|
|
__seterrno ();
|
|
close_maybe (get_io_handle ());
|
|
close_maybe (get_output_handle ());
|
|
close_maybe (input_available_event);
|
|
close_maybe (output_mutex);
|
|
close_maybe (input_mutex);
|
|
close_maybe (from_master);
|
|
close_maybe (to_master);
|
|
close_maybe (master_ctl);
|
|
termios_printf ("pty%d open failed - failed to create %s", unit, errstr);
|
|
return false;
|
|
}
|
|
|
|
void
|
|
fhandler_pty_master::fixup_after_fork (HANDLE parent)
|
|
{
|
|
DWORD wpid = GetCurrentProcessId ();
|
|
fhandler_pty_master *arch = (fhandler_pty_master *) archetype;
|
|
if (arch->dwProcessId != wpid)
|
|
{
|
|
tty& t = *get_ttyp ();
|
|
if (myself->pid == t.master_pid)
|
|
{
|
|
t.from_master = arch->from_master;
|
|
t.to_master = arch->to_master;
|
|
}
|
|
arch->dwProcessId = wpid;
|
|
}
|
|
from_master = arch->from_master;
|
|
to_master = arch->to_master;
|
|
report_tty_counts (this, "inherited master", "");
|
|
}
|
|
|
|
void
|
|
fhandler_pty_master::fixup_after_exec ()
|
|
{
|
|
if (!close_on_exec ())
|
|
fixup_after_fork (spawn_info->parent);
|
|
else
|
|
from_master = to_master = NULL;
|
|
}
|