1052 lines
25 KiB
C++
1052 lines
25 KiB
C++
/* dtable.cc: file descriptor support.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009, 2010, 2011 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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#define __INSIDE_CYGWIN_NET__
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#include "winsup.h"
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#include <sys/socket.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <wchar.h>
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#define USE_SYS_TYPES_FD_SET
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#include <winsock.h>
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#include "pinfo.h"
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "path.h"
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#include "fhandler.h"
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#include "select.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "tls_pbuf.h"
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#include "ntdll.h"
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#include "shared_info.h"
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static const NO_COPY DWORD std_consts[] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
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STD_ERROR_HANDLE};
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static bool handle_to_fn (HANDLE, char *);
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#define WCLEN(x) ((sizeof (x) / sizeof (WCHAR)) - 1)
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char unknown_file[] = "some disk file";
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const WCHAR DEV_NULL[] = L"\\Device\\Null";
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static const WCHAR DEV_SOCKET[] = L"\\Device\\Afd";
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const WCHAR DEVICE_PREFIX[] = L"\\device\\";
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const size_t DEVICE_PREFIX_LEN WCLEN (DEVICE_PREFIX);
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static const WCHAR DEV_NAMED_PIPE[] = L"\\Device\\NamedPipe\\";
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static const size_t DEV_NAMED_PIPE_LEN = WCLEN (DEV_NAMED_PIPE);
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static const WCHAR DEV_REMOTE[] = L"\\Device\\LanmanRedirector\\";
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static const size_t DEV_REMOTE_LEN = WCLEN (DEV_REMOTE);
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static const WCHAR DEV_REMOTE1[] = L"\\Device\\WinDfs\\Root\\";
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static const size_t DEV_REMOTE1_LEN = WCLEN (DEV_REMOTE1);
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/* Set aside space for the table of fds */
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void
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dtable_init ()
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{
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if (!cygheap->fdtab.size)
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cygheap->fdtab.extend (NOFILE_INCR);
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}
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void __stdcall
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set_std_handle (int fd)
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{
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if (fd == 0)
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SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_handle ());
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else if (fd <= 2)
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SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_output_handle ());
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}
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int
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dtable::extend (int howmuch)
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{
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int new_size = size + howmuch;
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fhandler_base **newfds;
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if (howmuch <= 0)
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return 0;
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if (new_size > OPEN_MAX_MAX)
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{
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set_errno (EMFILE);
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return 0;
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}
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/* Try to allocate more space for fd table. We can't call realloc ()
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here to preserve old table if memory allocation fails */
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if (!(newfds = (fhandler_base **) ccalloc (HEAP_ARGV, new_size, sizeof newfds[0])))
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{
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debug_printf ("calloc failed");
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set_errno (ENOMEM);
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return 0;
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}
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if (fds)
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{
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memcpy (newfds, fds, size * sizeof (fds[0]));
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cfree (fds);
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}
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size = new_size;
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fds = newfds;
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debug_printf ("size %d, fds %p", size, fds);
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return 1;
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}
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void
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dtable::get_debugger_info ()
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{
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extern bool jit_debug;
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if (!jit_debug && being_debugged ())
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{
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char std[3][sizeof ("/dev/ttyNNNN")];
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std[0][0] = std[1][0] = std [2][0] = '\0';
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char buf[sizeof ("cYgstd %x") + 32];
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sprintf (buf, "cYgstd %x %x %x", (unsigned) &std, sizeof (std[0]), 3);
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OutputDebugString (buf);
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for (int i = 0; i < 3; i++)
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if (std[i][0])
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{
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HANDLE h = GetStdHandle (std_consts[i]);
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fhandler_base *fh = build_fh_name (std[i]);
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if (!fh)
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continue;
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fds[i] = fh;
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if (!fh->open ((i ? (i == 2 ? O_RDWR : O_WRONLY) : O_RDONLY)
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| O_BINARY, 0777))
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release (i);
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else
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CloseHandle (h);
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/* Copy to Windows' idea of a standard handle, otherwise
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we have invalid standard handles when calling Windows
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functions (small_printf and strace might suffer, too). */
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SetStdHandle (std_consts[i], i ? fh->get_output_handle ()
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: fh->get_handle ());
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}
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}
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}
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/* Initialize the file descriptor/handle mapping table.
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This function should only be called when a cygwin function is invoked
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by a non-cygwin function, i.e., it should only happen very rarely. */
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void
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dtable::stdio_init ()
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{
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/* Set these before trying to output anything from strace.
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Also, always set them even if we're to pick up our parent's fds
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in case they're missed. */
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if (myself->cygstarted || ISSTATE (myself, PID_CYGPARENT))
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{
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tty_min *t = cygwin_shared->tty.get_tty (myself->ctty);
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if (t && t->getpgid () == myself->pid && t->gethwnd ())
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init_console_handler (true);
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return;
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}
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HANDLE in = GetStdHandle (STD_INPUT_HANDLE);
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HANDLE out = GetStdHandle (STD_OUTPUT_HANDLE);
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HANDLE err = GetStdHandle (STD_ERROR_HANDLE);
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init_std_file_from_handle (0, in);
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/* STD_ERROR_HANDLE has been observed to be the same as
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STD_OUTPUT_HANDLE. We need separate handles (e.g. using pipes
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to pass data from child to parent). */
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/* CV 2008-10-17: Under debugger control, std fd's have been potentially
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initialized in dtable::get_debugger_info (). In this case
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init_std_file_from_handle is a no-op, so, even if out == err we don't
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want to duplicate the handle since it will be unused. */
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if (out == err && (!being_debugged () || !not_open (2)))
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{
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/* Since this code is not invoked for forked tasks, we don't have
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to worry about the close-on-exec flag here. */
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if (!DuplicateHandle (GetCurrentProcess (), out,
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GetCurrentProcess (), &err,
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0, TRUE, DUPLICATE_SAME_ACCESS))
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{
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/* If that fails, do this as a fall back. */
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err = out;
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system_printf ("couldn't make stderr distinct from stdout, %E");
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}
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}
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init_std_file_from_handle (1, out);
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init_std_file_from_handle (2, err);
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}
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const int dtable::initial_archetype_size;
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fhandler_base *
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dtable::find_archetype (device& dev)
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{
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for (unsigned i = 0; i < farchetype; i++)
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if (archetypes[i]->get_device () == (unsigned) dev)
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return archetypes[i];
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return NULL;
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}
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fhandler_base **
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dtable::add_archetype ()
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{
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if (farchetype++ >= narchetypes)
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archetypes = (fhandler_base **) crealloc_abort (archetypes, (narchetypes += initial_archetype_size) * sizeof archetypes[0]);
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return archetypes + farchetype - 1;
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}
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void
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dtable::delete_archetype (fhandler_base *fh)
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{
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for (unsigned i = 0; i < farchetype; i++)
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if (fh == archetypes[i])
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{
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debug_printf ("deleting element %d for %s", i, fh->get_name ());
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if (i < --farchetype)
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archetypes[i] = archetypes[farchetype];
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break;
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}
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delete fh;
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}
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int
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dtable::find_unused_handle (int start)
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{
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do
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{
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for (size_t i = start; i < size; i++)
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/* See if open -- no need for overhead of not_open */
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if (fds[i] == NULL)
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return i;
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}
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while (extend (NOFILE_INCR));
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return -1;
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}
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void
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dtable::release (int fd)
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{
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if (!not_open (fd))
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{
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if (fds[fd]->need_fixup_before ())
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dec_need_fixup_before ();
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fhandler_base *arch = fds[fd]->archetype;
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delete fds[fd];
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if (arch && !arch->usecount)
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cygheap->fdtab.delete_archetype (arch);
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fds[fd] = NULL;
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}
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}
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extern "C" int
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cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
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DWORD myaccess)
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{
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if (fd == -1)
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fd = cygheap->fdtab.find_unused_handle ();
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fhandler_base *fh = build_fh_name (name);
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cygheap->fdtab[fd] = fh;
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fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
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return fd;
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}
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void
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dtable::init_std_file_from_handle (int fd, HANDLE handle)
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{
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CONSOLE_SCREEN_BUFFER_INFO buf;
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DCB dcb;
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unsigned bin = O_BINARY;
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device dev;
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dev.devn = 0; /* FIXME: device */
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first_fd_for_open = 0;
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if (!not_open (fd))
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return;
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SetLastError (0);
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DWORD access = 0;
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DWORD ft = GetFileType (handle);
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char name[NT_MAX_PATH];
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name[0] = '\0';
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if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE)
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/* can't figure out what this is */;
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else if (ft == FILE_TYPE_PIPE)
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{
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int rcv = 0, len = sizeof (int);
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if (handle_to_fn (handle, name))
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dev.parse (name);
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else if (strcmp (name, ":sock:") == 0
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/* NtQueryObject returns an error when called on an LSP socket
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handle. While fdsock now tries to fetch the underlying
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base socket, this only works on Vista and later. */
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|| (strcmp (name, unknown_file) == 0
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&& !::getsockopt ((SOCKET) handle, SOL_SOCKET, SO_RCVBUF,
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(char *) &rcv, &len)))
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{
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/* socket */
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dev = *tcp_dev;
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name[0] = '\0';
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}
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else if (fd == 0)
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dev = *piper_dev;
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else
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dev = *pipew_dev;
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}
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else if (GetConsoleScreenBufferInfo (handle, &buf))
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{
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/* Console output */
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if (ISSTATE (myself, PID_USETTY))
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dev.parse (FH_TTY);
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else
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dev = *console_dev;
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}
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else if (GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
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{
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/* Console input */
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if (ISSTATE (myself, PID_USETTY))
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dev.parse (FH_TTY);
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else
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dev = *console_dev;
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}
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else if (GetCommState (handle, &dcb))
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/* serial */
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dev.parse (DEV_TTYS_MAJOR, 0);
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else
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/* Try to figure it out from context - probably a disk file */
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handle_to_fn (handle, name);
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if (!name[0] && !dev)
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fds[fd] = NULL;
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else
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{
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fhandler_base *fh;
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if (dev)
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fh = build_fh_dev (dev);
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else
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fh = build_fh_name (name);
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if (name[0])
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{
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bin = fh->pc_binmode ();
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if (!bin)
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{
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bin = fh->get_default_fmode (O_RDWR);
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if (!bin && dev)
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bin = O_BINARY;
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}
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}
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IO_STATUS_BLOCK io;
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FILE_ACCESS_INFORMATION fai;
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/* Console windows are not kernel objects, so the access mask returned
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by NtQueryInformationFile is meaningless. CMD always hands down
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stdin handles as R/O handles, but our tty slave sides are R/W. */
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if (dev == FH_TTY || dev == FH_CONSOLE || dev.major == DEV_TTYS_MAJOR)
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access |= GENERIC_READ | GENERIC_WRITE;
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else if (NT_SUCCESS (NtQueryInformationFile (handle, &io, &fai,
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sizeof fai,
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FileAccessInformation)))
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{
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if (fai.AccessFlags & FILE_READ_DATA)
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access |= GENERIC_READ;
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if (fai.AccessFlags & FILE_WRITE_DATA)
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access |= GENERIC_WRITE;
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}
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else if (fd == 0)
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access |= GENERIC_READ;
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else
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access |= GENERIC_WRITE; /* Should be rdwr for stderr but not sure that's
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possible for some versions of handles */
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/* FIXME: Workaround Windows 7 issue. If the parent process of
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the process tree closes the original handles to the console window,
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strange problems occur when starting child processes later on if
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stdio redirection is used.
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CV 2009-08-08: It looks like this problem has been fixed only
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half-heartedly in RTM. Unfortunately the new implementation
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has still a problem which now also occurs on the 32 bit release
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of Windows 7. It's still not quite clear what happens but it's
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easily reproducible. Just start X via the start menu entry.
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This opens an xterm window with a shell. Exit from the shell,
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and you get a Windows error box reporting a crash in the
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Console Window Host application (conhost.exe) due to an access
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violation.
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This needs further investigation but the workaround not to close
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the handles will have a marginal hit of three extra handles per
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process at most. */
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if (!fh->init (dev == FH_CONSOLE && wincap.has_console_handle_problem ()
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? INVALID_HANDLE_VALUE : handle, access, bin))
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api_fatal ("couldn't initialize fd %d for %s", fd, fh->get_name ());
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cygheap->fdtab[fd] = fh;
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set_std_handle (fd);
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paranoid_printf ("fd %d, handle %p", fd, handle);
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}
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}
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#define cnew(name) new ((void *) ccalloc (HEAP_FHANDLER, 1, sizeof (name))) name
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fhandler_base *
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build_fh_name (const char *name, unsigned opt, suffix_info *si)
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{
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path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
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if (pc.error)
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{
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fhandler_base *fh = cnew (fhandler_nodevice) ();
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if (fh)
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fh->set_error (pc.error);
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set_errno (fh ? pc.error : EMFILE);
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return fh;
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}
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return build_fh_pc (pc);
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}
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fhandler_base *
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build_fh_dev (const device& dev, const char *unix_name)
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{
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path_conv pc (dev);
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if (unix_name)
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pc.set_normalized_path (unix_name);
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else
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pc.set_normalized_path (dev.name);
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return build_fh_pc (pc);
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}
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#define fh_unset ((fhandler_base *) 1)
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fhandler_base *
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build_fh_pc (path_conv& pc, bool set_name)
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{
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fhandler_base *fh = fh_unset;
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switch (pc.dev.major)
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{
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case DEV_TTYS_MAJOR:
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fh = cnew (fhandler_tty_slave) ();
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break;
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case DEV_TTYM_MAJOR:
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fh = cnew (fhandler_tty_master) ();
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break;
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case DEV_CYGDRIVE_MAJOR:
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fh = cnew (fhandler_cygdrive) ();
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break;
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case DEV_FLOPPY_MAJOR:
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case DEV_CDROM_MAJOR:
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case DEV_SD_MAJOR:
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case DEV_SD1_MAJOR:
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case DEV_SD2_MAJOR:
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case DEV_SD3_MAJOR:
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case DEV_SD4_MAJOR:
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case DEV_SD5_MAJOR:
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case DEV_SD6_MAJOR:
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case DEV_SD7_MAJOR:
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fh = cnew (fhandler_dev_floppy) ();
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break;
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case DEV_TAPE_MAJOR:
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fh = cnew (fhandler_dev_tape) ();
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break;
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case DEV_SERIAL_MAJOR:
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fh = cnew (fhandler_serial) ();
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break;
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default:
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switch (pc.dev)
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{
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case FH_CONSOLE:
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case FH_CONIN:
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case FH_CONOUT:
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fh = cnew (fhandler_console) ();
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break;
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case FH_PTYM:
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fh = cnew (fhandler_pty_master) ();
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break;
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case FH_WINDOWS:
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fh = cnew (fhandler_windows) ();
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break;
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case FH_FIFO:
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fh = cnew (fhandler_fifo) ();
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break;
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case FH_PIPE:
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case FH_PIPER:
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case FH_PIPEW:
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fh = cnew (fhandler_pipe) ();
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break;
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case FH_TCP:
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case FH_UDP:
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case FH_ICMP:
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case FH_UNIX:
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case FH_STREAM:
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case FH_DGRAM:
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fh = cnew (fhandler_socket) ();
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break;
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case FH_FS:
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fh = cnew (fhandler_disk_file) ();
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break;
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case FH_NULL:
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fh = cnew (fhandler_dev_null) ();
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break;
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case FH_ZERO:
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case FH_FULL:
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fh = cnew (fhandler_dev_zero) ();
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break;
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case FH_RANDOM:
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case FH_URANDOM:
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fh = cnew (fhandler_dev_random) ();
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break;
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case FH_MEM:
|
|
case FH_PORT:
|
|
fh = cnew (fhandler_dev_mem) ();
|
|
break;
|
|
case FH_CLIPBOARD:
|
|
fh = cnew (fhandler_dev_clipboard) ();
|
|
break;
|
|
case FH_OSS_DSP:
|
|
fh = cnew (fhandler_dev_dsp) ();
|
|
break;
|
|
case FH_PROC:
|
|
fh = cnew (fhandler_proc) ();
|
|
break;
|
|
case FH_REGISTRY:
|
|
fh = cnew (fhandler_registry) ();
|
|
break;
|
|
case FH_PROCESS:
|
|
case FH_PROCESSFD:
|
|
fh = cnew (fhandler_process) ();
|
|
break;
|
|
case FH_PROCNET:
|
|
fh = cnew (fhandler_procnet) ();
|
|
break;
|
|
case FH_PROCSYS:
|
|
fh = cnew (fhandler_procsys) ();
|
|
break;
|
|
case FH_PROCSYSVIPC:
|
|
fh = cnew (fhandler_procsysvipc) ();
|
|
break;
|
|
case FH_NETDRIVE:
|
|
fh = cnew (fhandler_netdrive) ();
|
|
break;
|
|
case FH_TTY:
|
|
{
|
|
if (myself->ctty == TTY_CONSOLE)
|
|
fh = cnew (fhandler_console) ();
|
|
else if (myself->ctty >= 0)
|
|
fh = cnew (fhandler_tty_slave) ();
|
|
break;
|
|
}
|
|
case FH_KMSG:
|
|
fh = cnew (fhandler_mailslot) ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fh == fh_unset)
|
|
fh = cnew (fhandler_nodevice) ();
|
|
|
|
if (!fh)
|
|
set_errno (EMFILE);
|
|
else if (set_name)
|
|
fh->set_name (pc);
|
|
|
|
debug_printf ("fh %p", fh);
|
|
return fh;
|
|
}
|
|
|
|
fhandler_base *
|
|
dtable::dup_worker (fhandler_base *oldfh, int flags)
|
|
{
|
|
/* Don't call set_name in build_fh_pc. It will be called in
|
|
fhandler_base::operator= below. Calling it twice will result
|
|
in double allocation. */
|
|
fhandler_base *newfh = build_fh_pc (oldfh->pc, false);
|
|
if (!newfh)
|
|
debug_printf ("build_fh_pc failed");
|
|
else
|
|
{
|
|
*newfh = *oldfh;
|
|
newfh->set_io_handle (NULL);
|
|
newfh->pc.reset_conv_handle ();
|
|
if (oldfh->dup (newfh))
|
|
{
|
|
delete newfh;
|
|
newfh = NULL;
|
|
debug_printf ("oldfh->dup failed");
|
|
}
|
|
else
|
|
{
|
|
/* The O_CLOEXEC flag enforces close-on-exec behaviour. */
|
|
if (flags & O_CLOEXEC)
|
|
newfh->set_close_on_exec (true);
|
|
else
|
|
newfh->close_on_exec (false);
|
|
debug_printf ("duped '%s' old %p, new %p", oldfh->get_name (), oldfh->get_io_handle (), newfh->get_io_handle ());
|
|
}
|
|
}
|
|
return newfh;
|
|
}
|
|
|
|
int
|
|
dtable::dup3 (int oldfd, int newfd, int flags)
|
|
{
|
|
int res = -1;
|
|
fhandler_base *newfh = NULL; // = NULL to avoid an incorrect warning
|
|
|
|
MALLOC_CHECK;
|
|
debug_printf ("dup3 (%d, %d, %p)", oldfd, newfd, flags);
|
|
lock ();
|
|
|
|
if (not_open (oldfd))
|
|
{
|
|
syscall_printf ("fd %d not open", oldfd);
|
|
set_errno (EBADF);
|
|
goto done;
|
|
}
|
|
if (newfd < 0)
|
|
{
|
|
syscall_printf ("new fd out of bounds: %d", newfd);
|
|
set_errno (EBADF);
|
|
goto done;
|
|
}
|
|
if ((flags & ~O_CLOEXEC) != 0)
|
|
{
|
|
syscall_printf ("invalid flags value %x", flags);
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
if ((newfh = dup_worker (fds[oldfd], flags)) == NULL)
|
|
{
|
|
res = -1;
|
|
goto done;
|
|
}
|
|
|
|
debug_printf ("newfh->io_handle %p, oldfh->io_handle %p, new win32_name %p, old win32_name %p",
|
|
newfh->get_io_handle (), fds[oldfd]->get_io_handle (), newfh->get_win32_name (), fds[oldfd]->get_win32_name ());
|
|
|
|
if (!not_open (newfd))
|
|
close (newfd);
|
|
else if ((size_t) newfd < size)
|
|
/* nothing to do */;
|
|
else if (find_unused_handle (newfd) < 0)
|
|
{
|
|
newfh->close ();
|
|
res = -1;
|
|
goto done;
|
|
}
|
|
|
|
fds[newfd] = newfh;
|
|
|
|
if ((res = newfd) <= 2)
|
|
set_std_handle (res);
|
|
|
|
done:
|
|
MALLOC_CHECK;
|
|
unlock ();
|
|
syscall_printf ("%d = dup3 (%d, %d, %p)", res, oldfd, newfd, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
bool
|
|
dtable::select_read (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return false;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_read (ss);
|
|
s->fd = fd;
|
|
if (!s->fh)
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name (), fd);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
dtable::select_write (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return NULL;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_write (ss);
|
|
s->fd = fd;
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name ());
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
dtable::select_except (int fd, select_stuff *ss)
|
|
{
|
|
if (not_open (fd))
|
|
{
|
|
set_errno (EBADF);
|
|
return NULL;
|
|
}
|
|
fhandler_base *fh = fds[fd];
|
|
select_record *s = fh->select_except (ss);
|
|
s->fd = fd;
|
|
s->fh = fh;
|
|
s->thread_errno = 0;
|
|
debug_printf ("%s fd %d", fh->get_name (), fd);
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dtable::move_fd (int from, int to)
|
|
{
|
|
// close (to); /* It is assumed that this is close-on-exec */
|
|
fds[to] = fds[from];
|
|
fds[from] = NULL;
|
|
}
|
|
|
|
void
|
|
dtable::set_file_pointers_for_exec ()
|
|
{
|
|
/* This is not POSIX-compliant so the function is only called for
|
|
non-Cygwin processes. */
|
|
LONG off_high = 0;
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL && fh->get_flags () & O_APPEND)
|
|
SetFilePointer (fh->get_handle (), 0, &off_high, FILE_END);
|
|
unlock ();
|
|
}
|
|
|
|
void
|
|
dtable::fixup_after_exec ()
|
|
{
|
|
first_fd_for_open = 0;
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
fh->clear_readahead ();
|
|
fh->fixup_after_exec ();
|
|
if (fh->close_on_exec ())
|
|
{
|
|
if (fh->archetype)
|
|
{
|
|
debug_printf ("closing fd %d since it is an archetype", i);
|
|
fh->close ();
|
|
}
|
|
release (i);
|
|
}
|
|
else if (fh->get_popen_pid ())
|
|
close (i);
|
|
else if (i == 0)
|
|
SetStdHandle (std_consts[i], fh->get_io_handle ());
|
|
else if (i <= 2)
|
|
SetStdHandle (std_consts[i], fh->get_output_handle ());
|
|
}
|
|
}
|
|
|
|
void
|
|
dtable::fixup_after_fork (HANDLE parent)
|
|
{
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
if (fh->close_on_exec () || fh->need_fork_fixup ())
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_after_fork (parent);
|
|
}
|
|
if (i == 0)
|
|
SetStdHandle (std_consts[i], fh->get_io_handle ());
|
|
else if (i <= 2)
|
|
SetStdHandle (std_consts[i], fh->get_output_handle ());
|
|
}
|
|
}
|
|
|
|
#ifdef NEWVFORK
|
|
int
|
|
dtable::vfork_child_dup ()
|
|
{
|
|
fhandler_base **newtable;
|
|
lock ();
|
|
newtable = (fhandler_base **) ccalloc (HEAP_ARGV, size, sizeof (fds[0]));
|
|
int res = 1;
|
|
|
|
/* Remove impersonation */
|
|
cygheap->user.deimpersonate ();
|
|
if (cygheap->ctty)
|
|
{
|
|
cygheap->ctty->usecount++;
|
|
cygheap->console_count++;
|
|
report_tty_counts (cygheap->ctty, "vfork dup", "incremented ", "");
|
|
}
|
|
|
|
for (size_t i = 0; i < size; i++)
|
|
if (not_open (i))
|
|
continue;
|
|
else if ((newtable[i] = dup_worker (fds[i])) != NULL)
|
|
newtable[i]->set_close_on_exec (fds[i]->close_on_exec ());
|
|
else
|
|
{
|
|
res = 0;
|
|
goto out;
|
|
}
|
|
|
|
fds_on_hold = fds;
|
|
fds = newtable;
|
|
|
|
out:
|
|
/* Restore impersonation */
|
|
cygheap->user.reimpersonate ();
|
|
|
|
unlock ();
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
dtable::vfork_parent_restore ()
|
|
{
|
|
lock ();
|
|
|
|
fhandler_tty_slave *ctty_on_hold = cygheap->ctty_on_hold;
|
|
close_all_files ();
|
|
fhandler_base **deleteme = fds;
|
|
fds = fds_on_hold;
|
|
fds_on_hold = NULL;
|
|
cfree (deleteme);
|
|
unlock ();
|
|
|
|
if (cygheap->ctty != ctty_on_hold)
|
|
{
|
|
cygheap->ctty = ctty_on_hold; // revert
|
|
cygheap->ctty->close (); // Undo previous bump of this archetype
|
|
}
|
|
cygheap->ctty_on_hold = NULL;
|
|
}
|
|
|
|
void
|
|
dtable::vfork_child_fixup ()
|
|
{
|
|
if (!fds_on_hold)
|
|
return;
|
|
debug_printf ("here");
|
|
fhandler_base **saveme = fds;
|
|
fds = fds_on_hold;
|
|
|
|
fhandler_base *fh;
|
|
for (int i = 0; i < (int) size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
fh->clear_readahead ();
|
|
if (!fh->archetype && fh->close_on_exec ())
|
|
release (i);
|
|
else
|
|
{
|
|
fh->close ();
|
|
release (i);
|
|
}
|
|
}
|
|
|
|
fds = saveme;
|
|
cfree (fds_on_hold);
|
|
fds_on_hold = NULL;
|
|
|
|
if (cygheap->ctty_on_hold)
|
|
{
|
|
cygheap->ctty_on_hold->close ();
|
|
cygheap->ctty_on_hold = NULL;
|
|
}
|
|
}
|
|
#endif /*NEWVFORK*/
|
|
|
|
static void
|
|
decode_tty (char *buf, WCHAR *w32)
|
|
{
|
|
int ttyn = wcstol (w32, NULL, 10);
|
|
__small_sprintf (buf, "/dev/tty%d", ttyn);
|
|
}
|
|
|
|
/* Try to derive posix filename from given handle. Return true if
|
|
the handle is associated with a cygwin tty. */
|
|
static bool
|
|
handle_to_fn (HANDLE h, char *posix_fn)
|
|
{
|
|
tmp_pathbuf tp;
|
|
ULONG len = 0;
|
|
WCHAR *maxmatchdos = NULL;
|
|
int maxmatchlen = 0;
|
|
OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) tp.w_get ();
|
|
|
|
NTSTATUS status = NtQueryObject (h, ObjectNameInformation, ntfn, 65536, &len);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("NtQueryObject failed, %p", status);
|
|
// NT seems to do this on an unopened file
|
|
else if (!ntfn->Name.Buffer)
|
|
debug_printf ("nt->Name.Buffer == NULL");
|
|
else
|
|
{
|
|
WCHAR *w32 = ntfn->Name.Buffer;
|
|
size_t w32len = ntfn->Name.Length / sizeof (WCHAR);
|
|
w32[w32len] = L'\0';
|
|
|
|
if (wcscasecmp (w32, DEV_NULL) == 0)
|
|
{
|
|
strcpy (posix_fn, "/dev/null");
|
|
return false;
|
|
}
|
|
|
|
if (wcscasecmp (w32, DEV_SOCKET) == 0)
|
|
{
|
|
strcpy (posix_fn, ":sock:");
|
|
return false;
|
|
}
|
|
|
|
if (wcsncasecmp (w32, DEV_NAMED_PIPE, DEV_NAMED_PIPE_LEN) == 0)
|
|
{
|
|
w32 += DEV_NAMED_PIPE_LEN;
|
|
if (wcsncmp (w32, L"cygwin-", WCLEN (L"cygwin-")) != 0)
|
|
return false;
|
|
w32 += WCLEN (L"cygwin-");
|
|
/* Check for installation key and trailing dash. */
|
|
w32len = installation_key.Length / sizeof (WCHAR);
|
|
if (w32len && wcsncmp (w32, installation_key.Buffer, w32len) != 0)
|
|
return false;
|
|
w32 += w32len;
|
|
if (*w32 != L'-')
|
|
return false;
|
|
++w32;
|
|
bool istty = wcsncmp (w32, L"tty", WCLEN (L"tty")) == 0;
|
|
if (istty)
|
|
decode_tty (posix_fn, w32 + WCLEN (L"tty"));
|
|
else if (wcsncmp (w32, L"pipe", WCLEN (L"pipe")) == 0)
|
|
strcpy (posix_fn, "/dev/pipe");
|
|
return istty;
|
|
}
|
|
|
|
WCHAR fnbuf[64 * 1024];
|
|
if (wcsncasecmp (w32, DEVICE_PREFIX, DEVICE_PREFIX_LEN) != 0
|
|
|| !QueryDosDeviceW (NULL, fnbuf, sizeof (fnbuf)))
|
|
{
|
|
sys_wcstombs (posix_fn, NT_MAX_PATH, w32, w32len);
|
|
return false;
|
|
}
|
|
|
|
for (WCHAR *s = fnbuf; *s; s = wcschr (s, '\0') + 1)
|
|
{
|
|
WCHAR device[NT_MAX_PATH];
|
|
if (!QueryDosDeviceW (s, device, sizeof (device)))
|
|
continue;
|
|
if (wcschr (s, ':') == NULL)
|
|
continue;
|
|
WCHAR *q = wcsrchr (device, ';');
|
|
if (q)
|
|
{
|
|
WCHAR *r = wcschr (q, '\\');
|
|
if (r)
|
|
wcscpy (q, r + 1);
|
|
}
|
|
int devlen = wcslen (device);
|
|
if (device[devlen - 1] == L'\\')
|
|
device[--devlen] = L'\0';
|
|
if (devlen < maxmatchlen)
|
|
continue;
|
|
if (wcsncmp (device, w32, devlen) != 0||
|
|
(w32[devlen] != L'\0' && w32[devlen] != L'\\'))
|
|
continue;
|
|
maxmatchlen = devlen;
|
|
maxmatchdos = s;
|
|
debug_printf ("current match '%W' = '%W'\n", s, device);
|
|
}
|
|
|
|
if (maxmatchlen)
|
|
{
|
|
WCHAR *p = wcschr (w32 + DEVICE_PREFIX_LEN, L'\\');
|
|
size_t n = wcslen (maxmatchdos);
|
|
WCHAR ch;
|
|
if (!p)
|
|
ch = L'\0';
|
|
else
|
|
{
|
|
if (maxmatchdos[n - 1] == L'\\')
|
|
n--;
|
|
w32 += maxmatchlen - n;
|
|
ch = L'\\';
|
|
}
|
|
memcpy (w32, maxmatchdos, n * sizeof (WCHAR));
|
|
w32[n] = ch;
|
|
}
|
|
else if (wcsncmp (w32, DEV_REMOTE, DEV_REMOTE_LEN) == 0)
|
|
{
|
|
w32 += DEV_REMOTE_LEN - 2;
|
|
*w32 = L'\\';
|
|
debug_printf ("remote drive");
|
|
}
|
|
else if (wcsncmp (w32, DEV_REMOTE1, DEV_REMOTE1_LEN) == 0)
|
|
{
|
|
w32 += DEV_REMOTE1_LEN - 2;
|
|
*w32 = L'\\';
|
|
debug_printf ("remote drive");
|
|
}
|
|
|
|
cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_ABSOLUTE, w32, posix_fn,
|
|
NT_MAX_PATH);
|
|
|
|
debug_printf ("derived path '%W', posix '%s'", w32, posix_fn);
|
|
return false;
|
|
}
|
|
|
|
strcpy (posix_fn, unknown_file);
|
|
return false;
|
|
}
|
|
|
|
void
|
|
dtable::fixup_before_fork (DWORD target_proc_id)
|
|
{
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL)
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_before_fork_exec (target_proc_id);
|
|
}
|
|
unlock ();
|
|
}
|
|
void
|
|
dtable::fixup_before_exec (DWORD target_proc_id)
|
|
{
|
|
lock ();
|
|
fhandler_base *fh;
|
|
for (size_t i = 0; i < size; i++)
|
|
if ((fh = fds[i]) != NULL && !fh->close_on_exec ())
|
|
{
|
|
debug_printf ("fd %d (%s)", i, fh->get_name ());
|
|
fh->fixup_before_fork_exec (target_proc_id);
|
|
}
|
|
unlock ();
|
|
}
|
|
|