4
0
mirror of git://sourceware.org/git/newlib-cygwin.git synced 2025-01-20 21:39:21 +08:00
Takashi Yano bb42852062 Cygwin: pty: Implement new pseudo console support.
- In this implementation, pseudo console is created for each native
  console app. Advantages and disadvantages of this implementation
  over the previous implementation are as follows.

  Advantages:
  1) No performance degradation in pty output for cygwin process.
      https://cygwin.com/pipermail/cygwin/2020-February/243858.html
  2) Free from the problem caused by difference of behaviour of control
     sequences between real terminal and pseudo console.
      https://cygwin.com/pipermail/cygwin/2019-December/243281.html
      https://cygwin.com/pipermail/cygwin/2020-February/243855.html
  3) Free from the problem in cgdb and emacs gud.
      https://cygwin.com/pipermail/cygwin/2020-January/243601.html
      https://cygwin.com/pipermail/cygwin/2020-March/244146.html
  4) Redrawing screen on executing native console apps is not necessary.
  5) cygwin-console-helper is not necessary for the pseudo console
     support.
  6) The codes for pseudo console support are much simpler than that
     of the previous one.

  Disadvantages:
  1) The cygwin program which calls console API directly does not work.
  2) The apps which use console API cannot be debugged with gdb. This
     is because pseudo console is not activated since gdb uses
     CreateProcess() rather than exec(). Even with this limitation,
     attaching gdb to native apps, in which pseudo console is already
     activated, works.
  3) Typeahead key inputs are discarded while native console app is
     executed. Simirally, typeahead key inputs while cygwin app is
     executed are not inherited to native console app.
  4) Code page cannot be changed by chcp.com. Acctually, chcp works
     itself and changes code page of its own pseudo console.  However,
     since pseudo console is recreated for another process, it cannot
     inherit the code page.
  5) system_printf() does not work after stderr is closed. (Same with
     cygwin 3.0.7)
  6) Startup time of native console apps is about 3 times slower than
     previous implemenation.
  7) Pseudo console cannot be activated if it is already activated for
     another process on same pty.
2020-08-22 13:43:49 +02:00

1099 lines
27 KiB
C++

/* dtable.cc: file descriptor support.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#define __INSIDE_CYGWIN_NET__
#include "winsup.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <wchar.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock.h>
#include "pinfo.h"
#include "cygerrno.h"
#include "perprocess.h"
#include "path.h"
#include "fhandler.h"
#include "select.h"
#include "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
#include "ntdll.h"
#include "shared_info.h"
static const DWORD std_consts[] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
STD_ERROR_HANDLE};
static bool handle_to_fn (HANDLE, char *);
#define WCLEN(x) ((sizeof (x) / sizeof (WCHAR)) - 1)
static const char unknown_file[] = "some disk file";
static const WCHAR DEV_NULL[] = L"\\Device\\Null";
static const WCHAR DEV_SOCKET[] = L"\\Device\\Afd";
static const WCHAR DEVICE_PREFIX[] = L"\\device\\";
static const size_t DEVICE_PREFIX_LEN WCLEN (DEVICE_PREFIX);
static const WCHAR DEV_NAMED_PIPE[] = L"\\Device\\NamedPipe\\";
static const size_t DEV_NAMED_PIPE_LEN = WCLEN (DEV_NAMED_PIPE);
static const WCHAR DEV_REMOTE[] = L"\\Device\\LanmanRedirector\\";
static const size_t DEV_REMOTE_LEN = WCLEN (DEV_REMOTE);
static const WCHAR DEV_REMOTE1[] = L"\\Device\\WinDfs\\Root\\";
static const size_t DEV_REMOTE1_LEN = WCLEN (DEV_REMOTE1);
/* Set aside space for the table of fds */
void
dtable_init ()
{
if (!cygheap->fdtab.size)
cygheap->fdtab.extend (NOFILE_INCR, 0);
}
void __stdcall
set_std_handle (int fd)
{
fhandler_base *fh = cygheap->fdtab[fd];
if (fd == 0)
SetStdHandle (std_consts[fd], fh ? fh->get_handle () : NULL);
else if (fd <= 2)
SetStdHandle (std_consts[fd], fh ? fh->get_output_handle () : NULL);
}
int
dtable::extend (size_t howmuch, size_t min)
{
size_t new_size = size + howmuch;
fhandler_base **newfds;
if (new_size <= OPEN_MAX_MAX)
/* ok */;
else if (size < OPEN_MAX_MAX && min < OPEN_MAX_MAX)
new_size = OPEN_MAX_MAX;
else
{
set_errno (EMFILE);
return 0;
}
/* Try to allocate more space for fd table. We can't call realloc ()
here to preserve old table if memory allocation fails */
if (!(newfds = (fhandler_base **) ccalloc (HEAP_ARGV, new_size, sizeof newfds[0])))
{
debug_printf ("calloc failed");
set_errno (ENOMEM);
return 0;
}
if (fds)
{
memcpy (newfds, fds, size * sizeof (fds[0]));
cfree (fds);
}
size = new_size;
fds = newfds;
debug_printf ("size %ld, fds %p", size, fds);
return 1;
}
void
dtable::get_debugger_info ()
{
extern bool jit_debug;
if (!jit_debug && being_debugged ())
{
char std[3][sizeof ("/dev/ptyNNNN")];
std[0][0] = std[1][0] = std [2][0] = '\0';
char buf[sizeof ("cYgstd %x") + 64];
sprintf (buf, "cYgstd %p %zx %x", &std, sizeof (std[0]), 3);
OutputDebugString (buf);
for (int i = 0; i < 3; i++)
if (std[i][0])
{
HANDLE h = GetStdHandle (std_consts[i]);
fhandler_base *fh = build_fh_name (std[i]);
if (!fh)
continue;
fds[i] = fh;
if (!fh->open ((i ? (i == 2 ? O_RDWR : O_WRONLY) : O_RDONLY)
| O_BINARY, 0777))
release (i);
else
{
CloseHandle (h);
/* Copy to Windows' idea of a standard handle, otherwise
we have invalid standard handles when calling Windows
functions (small_printf and strace might suffer, too). */
SetStdHandle (std_consts[i], i ? fh->get_output_handle ()
: fh->get_handle ());
}
}
}
}
/* Initialize the file descriptor/handle mapping table.
This function should only be called when a cygwin function is invoked
by a non-cygwin function, i.e., it should only happen very rarely. */
void
dtable::stdio_init ()
{
if (myself->cygstarted || ISSTATE (myself, PID_CYGPARENT))
{
tty_min *t = cygwin_shared->tty.get_cttyp ();
if (t && t->is_console)
init_console_handler (true);
return;
}
HANDLE in = GetStdHandle (STD_INPUT_HANDLE);
HANDLE out = GetStdHandle (STD_OUTPUT_HANDLE);
HANDLE err = GetStdHandle (STD_ERROR_HANDLE);
init_std_file_from_handle (0, in);
/* STD_ERROR_HANDLE has been observed to be the same as
STD_OUTPUT_HANDLE. We need separate handles (e.g. using pipes
to pass data from child to parent). */
/* CV 2008-10-17: Under debugger control, std fd's have been potentially
initialized in dtable::get_debugger_info (). In this case
init_std_file_from_handle is a no-op, so, even if out == err we don't
want to duplicate the handle since it will be unused. */
if (out == err && (!being_debugged () || not_open (2)))
{
/* Since this code is not invoked for forked tasks, we don't have
to worry about the close-on-exec flag here. */
if (!DuplicateHandle (GetCurrentProcess (), out,
GetCurrentProcess (), &err,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
/* If that fails, do this as a fall back. */
err = out;
system_printf ("couldn't make stderr distinct from stdout, %E");
}
}
init_std_file_from_handle (1, out);
init_std_file_from_handle (2, err);
}
const int dtable::initial_archetype_size;
fhandler_base *
dtable::find_archetype (device& dev)
{
for (unsigned i = 0; i < farchetype; i++)
if (archetypes[i]->get_device () == (dev_t) dev)
return archetypes[i];
return NULL;
}
fhandler_base **
dtable::add_archetype ()
{
if (farchetype++ >= narchetypes)
archetypes = (fhandler_base **) crealloc_abort (archetypes, (narchetypes += initial_archetype_size) * sizeof archetypes[0]);
return archetypes + farchetype - 1;
}
void
dtable::delete_archetype (fhandler_base *fh)
{
for (unsigned i = 0; i < farchetype; i++)
if (fh == archetypes[i])
{
debug_printf ("deleting element %d for %s(%d/%d)", i, fh->get_name (),
fh->dev ().get_major (), fh->dev ().get_minor ());
if (i < --farchetype)
archetypes[i] = archetypes[farchetype];
break;
}
delete fh;
}
int
dtable::find_unused_handle (size_t start)
{
/* When extending, try to allocate a NOFILE_INCR chunk
following the empty fd. */
size_t extendby = NOFILE_INCR + ((start >= size) ? 1 + start - size : 0);
/* This do loop should only ever execute twice. */
int res = -1;
do
{
for (size_t i = start; i < size; i++)
if (fds[i] == NULL)
{
res = (int) i;
goto out;
}
}
while (extend (extendby, start));
out:
return res;
}
void
dtable::release (int fd)
{
if (fds[fd]->need_fixup_before ())
dec_need_fixup_before ();
fds[fd]->dec_refcnt ();
fds[fd] = NULL;
if (fd <= 2)
set_std_handle (fd);
}
extern "C" int
cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
DWORD myaccess)
{
cygheap->fdtab.lock ();
if (fd == -1)
fd = cygheap->fdtab.find_unused_handle ();
fhandler_base *fh = build_fh_name (name);
if (!fh)
fd = -1;
else
{
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
}
cygheap->fdtab.unlock ();
return fd;
}
void
dtable::init_std_file_from_handle (int fd, HANDLE handle)
{
tmp_pathbuf tp;
CONSOLE_SCREEN_BUFFER_INFO buf;
DCB dcb;
unsigned bin = O_BINARY;
device dev;
first_fd_for_open = 0;
if (!not_open (fd))
return;
SetLastError (0);
DWORD access = 0;
DWORD ft = GetFileType (handle);
char *name = tp.c_get ();
name[0] = '\0';
if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE)
/* can't figure out what this is */;
else if (ft == FILE_TYPE_PIPE)
{
int rcv = 0, len = sizeof (int);
if (handle_to_fn (handle, name))
dev.parse (name);
else if (strcmp (name, ":sock:") == 0
/* NtQueryObject returns an error when called on an LSP socket
handle. fhandler_socket::set_socket_handle tries to fetch
the underlying base socket, but this might fail. */
|| (strcmp (name, unknown_file) == 0
&& !::getsockopt ((SOCKET) handle, SOL_SOCKET, SO_RCVBUF,
(char *) &rcv, &len)))
{
/* socket */
dev = *af_inet_dev;
name[0] = '\0';
}
else if (fd == 0)
dev = *piper_dev;
else
dev = *pipew_dev;
}
else if (GetConsoleScreenBufferInfo (handle, &buf)
|| GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
{
/* Console I/O */
if (myself->ctty > 0)
dev.parse (myself->ctty);
else
{
dev.parse (FH_CONSOLE);
CloseHandle (handle);
handle = INVALID_HANDLE_VALUE;
}
}
else if (GetCommState (handle, &dcb))
/* FIXME: Not right - assumes ttyS0 */
dev.parse (DEV_SERIAL_MAJOR, 0);
else
/* Try to figure it out from context - probably a disk file */
handle_to_fn (handle, name);
if (!name[0] && !dev)
fds[fd] = NULL;
else
{
fhandler_base *fh;
if (dev)
fh = build_fh_dev (dev);
else
fh = build_fh_name (name);
if (!fh)
return;
if (name[0])
{
bin = fh->pc_binmode ();
if (!bin)
{
bin = fh->get_default_fmode (O_RDWR);
if (!bin && dev)
bin = O_BINARY;
}
}
IO_STATUS_BLOCK io;
FILE_ACCESS_INFORMATION fai;
int openflags = O_BINARY;
/* Console windows are no kernel objects up to Windows 7/2008R2, so the
access mask returned by NtQueryInformationFile is meaningless. CMD
always hands down stdin handles as R/O handles, but our tty slave
sides are R/W. */
if (fh->is_tty ())
{
openflags |= O_RDWR;
access |= GENERIC_READ | GENERIC_WRITE;
}
else if (!iscons_dev (dev)
&& NT_SUCCESS (NtQueryInformationFile (handle, &io, &fai,
sizeof fai,
FileAccessInformation)))
{
if (fai.AccessFlags & FILE_WRITE_DATA)
{
openflags |= O_WRONLY;
access |= GENERIC_WRITE;
}
if (fai.AccessFlags & FILE_READ_DATA)
{
openflags |= openflags & O_WRONLY ? O_RDWR : O_RDONLY;
access |= GENERIC_READ;
}
}
else if (fd == 0)
{
openflags |= O_RDONLY;
access |= GENERIC_READ;
}
else
{
openflags |= O_WRONLY;
access |= GENERIC_WRITE; /* Should be rdwr for stderr but not sure that's
possible for some versions of handles */
}
if (!fh->init (handle, access, bin))
api_fatal ("couldn't initialize fd %d for %s", fd, fh->get_name ());
fh->open_setup (openflags);
fh->usecount = 0;
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
set_std_handle (fd);
paranoid_printf ("fd %d, handle %p", fd, handle);
}
}
#define cnew(name, ...) \
({ \
void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
ptr ? new (ptr) name (__VA_ARGS__) : NULL; \
})
#define cnew_no_ctor(name, ...) \
({ \
void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
ptr ? new (ptr) name (ptr) : NULL; \
})
fhandler_base *
build_fh_name (const char *name, unsigned opt, suffix_info *si)
{
path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
if (pc.error)
{
fhandler_base *fh = cnew (fhandler_nodevice);
if (fh)
fh->set_error (pc.error);
set_errno (fh ? pc.error : EMFILE);
return fh;
}
return build_fh_pc (pc);
}
fhandler_base *
build_fh_dev (const device& dev, const char *unix_name)
{
path_conv pc (dev);
if (unix_name)
pc.set_posix (unix_name);
else
pc.set_posix (dev.name ());
return build_fh_pc (pc);
}
#define fh_unset ((fhandler_base *) 1)
static device last_tty_dev;
#define fh_last_tty_dev ((fhandler_termios *) cygheap->fdtab.find_archetype (last_tty_dev))
static fhandler_base *
fh_alloc (path_conv& pc)
{
fhandler_base *fh = fh_unset;
fhandler_base *fhraw = NULL;
switch (pc.dev.get_major ())
{
case DEV_PTYS_MAJOR:
fh = cnew (fhandler_pty_slave, pc.dev.get_minor ());
break;
case DEV_PTYM_MAJOR:
fh = cnew (fhandler_pty_master, pc.dev.get_minor ());
break;
case DEV_FLOPPY_MAJOR:
case DEV_CDROM_MAJOR:
case DEV_SD_MAJOR:
case DEV_SD1_MAJOR ... DEV_SD7_MAJOR:
case DEV_SD_HIGHPART_START ... DEV_SD_HIGHPART_END:
fh = cnew (fhandler_dev_floppy);
break;
case DEV_TAPE_MAJOR:
fh = cnew (fhandler_dev_tape);
break;
case DEV_SERIAL_MAJOR:
fh = cnew (fhandler_serial);
break;
case DEV_CONS_MAJOR:
fh = cnew (fhandler_console, pc.dev);
break;
default:
switch ((dev_t) pc.dev)
{
case FH_CONSOLE:
case FH_CONIN:
case FH_CONOUT:
fh = cnew (fhandler_console, pc.dev);
break;
case FH_PTMX:
if (pc.isopen ())
fh = cnew (fhandler_pty_master, -1);
else
fhraw = cnew_no_ctor (fhandler_pty_master, -1);
break;
case FH_WINDOWS:
fh = cnew (fhandler_windows);
break;
case FH_FIFO:
fh = cnew (fhandler_fifo);
break;
case FH_PIPE:
case FH_PIPER:
case FH_PIPEW:
fh = cnew (fhandler_pipe);
break;
case FH_INET:
fh = cnew (fhandler_socket_inet);
break;
case FH_LOCAL:
fh = cnew (fhandler_socket_local);
break;
#ifdef __WITH_AF_UNIX
case FH_UNIX:
fh = cnew (fhandler_socket_unix);
break;
#endif /* __WITH_AF_UNIX */
case FH_FS:
fh = cnew (fhandler_disk_file);
break;
case FH_NULL:
fh = cnew (fhandler_dev_null);
break;
case FH_ZERO:
case FH_FULL:
fh = cnew (fhandler_dev_zero);
break;
case FH_RANDOM:
case FH_URANDOM:
fh = cnew (fhandler_dev_random);
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:
fh = cnew (fhandler_process);
break;
case FH_PROCESSFD:
fh = cnew (fhandler_process_fd);
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_DEV:
fh = cnew (fhandler_dev);
break;
case FH_CYGDRIVE:
fh = cnew (fhandler_cygdrive);
break;
case FH_SIGNALFD:
fh = cnew (fhandler_signalfd);
break;
case FH_TIMERFD:
fh = cnew (fhandler_timerfd);
break;
case FH_TTY:
if (!pc.isopen ())
{
fhraw = cnew_no_ctor (fhandler_console, -1);
debug_printf ("not called from open for /dev/tty");
}
else if (myself->ctty <= 0 && last_tty_dev
&& !myself->set_ctty (fh_last_tty_dev, 0))
debug_printf ("no /dev/tty assigned");
else if (myself->ctty > 0)
{
debug_printf ("determining /dev/tty assignment for ctty %p", myself->ctty);
if (iscons_dev (myself->ctty))
fh = cnew (fhandler_console, pc.dev);
else
fh = cnew (fhandler_pty_slave, myself->ctty);
if (fh->dev () != FH_NADA)
fh->set_name ("/dev/tty");
}
break;
}
}
/* If `fhraw' is set that means that this fhandler is just a dummy
set up for stat(). Mock it up for use by stat without actually
trying to do any real initialization. */
if (fhraw)
{
fh = fhraw;
fh->set_name (pc);
if (fh->use_archetype ())
fh->archetype = fh;
}
if (fh == fh_unset)
fh = cnew (fhandler_nodevice);
else if (fh->dev () == FH_ERROR)
{
if (!pc.isopen () && pc.dev.isfs ())
fh->dev () = pc.dev; /* Special case: This file actually exists on
disk and we're not trying to open it so just
return the info from pc. */
else
{
delete fh;
fh = NULL;
}
}
return fh;
}
fhandler_base *
build_fh_pc (path_conv& pc)
{
fhandler_base *fh = fh_alloc (pc);
if (!fh)
{
set_errno (ENXIO);
goto out;
}
if (!fh->use_archetype ())
fh->set_name (pc);
else if ((fh->archetype = cygheap->fdtab.find_archetype (fh->dev ())))
{
debug_printf ("found an archetype for %s(%d/%d) io_handle %p", fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor (),
fh->archetype->get_handle ());
if (!fh->get_name ())
fh->set_name (fh->archetype->dev ().name ());
}
else if (cygwin_finished_initializing && !pc.isopen ())
fh->set_name (pc);
else
{
if (!fh->get_name ())
fh->set_name (fh->dev ().native ());
fh->archetype = fh->clone ();
debug_printf ("created an archetype (%p) for %s(%d/%d)", fh->archetype, fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor ());
fh->archetype->archetype = NULL;
*cygheap->fdtab.add_archetype () = fh->archetype;
}
/* Keep track of the last tty-like thing opened. We could potentially want
to open it if /dev/tty is referenced. */
if (myself->ctty > 0 || !fh->is_tty () || !pc.isctty_capable ())
last_tty_dev = FH_NADA;
else
last_tty_dev = fh->dev ();
out:
debug_printf ("fh %p, dev %08x", fh, fh ? (dev_t) fh->dev () : 0);
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 = oldfh->clone ();
if (!newfh)
debug_printf ("build_fh_pc failed");
else
{
if (!oldfh->archetype)
newfh->set_handle (NULL);
newfh->pc.reset_conv_handle ();
if (oldfh->dup (newfh, flags))
{
delete newfh;
newfh = NULL;
debug_printf ("oldfh->dup failed");
}
else
{
/* Don't increment refcnt here since we don't know if this is a
allocated fd. So we leave this chore to the caller. */
newfh->usecount = 0;
newfh->archetype_usecount (1);
/* The O_CLOEXEC flag enforces close-on-exec behaviour. */
newfh->set_close_on_exec (!!(flags & O_CLOEXEC));
debug_printf ("duped '%s' old %p, new %p", oldfh->get_name (),
oldfh->get_handle (), newfh->get_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
debug_printf ("dup3 (%d, %d, %y)", oldfd, newfd, flags);
lock ();
bool do_unlock = true;
bool unlock_on_return;
if (!(flags & O_EXCL))
unlock_on_return = true; /* Relinquish lock on return */
else
{
flags &= ~O_EXCL;
unlock_on_return = false; /* Return with lock set on success */
}
if (not_open (oldfd))
{
syscall_printf ("fd %d not open", oldfd);
set_errno (EBADF);
goto done;
}
if (newfd >= OPEN_MAX_MAX || 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 %y", flags);
set_errno (EINVAL);
return -1;
}
/* This is a temporary kludge until all utilities can catch up with
a change in behavior that implements linux functionality: opening
a tty should not automatically cause it to become the controlling
tty for the process. */
if (newfd > 2)
flags |= O_NOCTTY;
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_handle (), fds[oldfd]->get_handle (), newfh->get_win32_name (), fds[oldfd]->get_win32_name ());
if (!not_open (newfd))
close (newfd);
else if ((size_t) newfd >= size
&& find_unused_handle (newfd) < 0)
/* couldn't extend fdtab */
{
newfh->close ();
res = -1;
goto done;
}
fds[newfd] = newfh;
if ((res = newfd) <= 2)
set_std_handle (res);
do_unlock = unlock_on_return;
done:
if (do_unlock)
unlock ();
syscall_printf ("%R = dup3(%d, %d, %y)", 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 (), fd);
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. */
LARGE_INTEGER eof = { QuadPart: 0 };
lock ();
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL && fh->get_flags () & O_APPEND)
SetFilePointerEx (fh->get_handle (), eof, NULL, FILE_END);
unlock ();
}
void
dtable::fixup_close (size_t i, fhandler_base *fh)
{
if (fh->archetype)
{
debug_printf ("closing fd %d since it is an archetype", i);
fh->close_with_arch ();
}
release (i);
}
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 ();
/* Close the handle if it's close-on-exec or if an error was detected
(typically with opening a console in a gui app) by fixup_after_exec.
*/
if (fh->close_on_exec () || (!fh->nohandle () && !fh->get_handle ()))
fixup_close (i, fh);
else if (fh->get_popen_pid ())
close (i);
else if (i == 0)
SetStdHandle (std_consts[i], fh->get_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 (!fh->nohandle () && !fh->get_handle ())
{
/* This should actually never happen but it's here to make sure
we don't crash due to access of an unopened file handle. */
fixup_close (i, fh);
continue;
}
}
if (i == 0)
SetStdHandle (std_consts[i], fh->get_handle ());
else if (i <= 2)
SetStdHandle (std_consts[i], fh->get_output_handle ());
}
}
static void
decode_tty (char *buf, WCHAR *w32)
{
int ttyn = wcstol (w32, NULL, 10);
__ptsname (buf, 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;
PWCHAR device = tp.w_get ();
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, %y", 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 = cygheap->installation_key.Length / sizeof (WCHAR);
if (w32len
&& wcsncmp (w32, cygheap->installation_key.Buffer, w32len) != 0)
return false;
w32 += w32len;
if (*w32 != L'-')
return false;
++w32;
bool istty = wcsncmp (w32, L"pty", WCLEN (L"pty")) == 0;
if (istty)
decode_tty (posix_fn, w32 + WCLEN (L"pty"));
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) / sizeof (WCHAR)))
{
sys_wcstombs (posix_fn, NT_MAX_PATH, w32, w32len);
return false;
}
for (WCHAR *s = fnbuf; *s; s = wcschr (s, '\0') + 1)
{
if (!QueryDosDeviceW (s, device, NT_MAX_PATH))
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 ();
}