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newlib-cygwin/winsup/cygwin/dtable.cc

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/* 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)
/* ok */;
else if (size < OPEN_MAX && min < OPEN_MAX)
new_size = OPEN_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 ());
if (fh->ispipe ())
{
fhandler_pipe *fhp = (fhandler_pipe *) fh;
fhp->set_pipe_buf_size ();
/* Set read pipe always to nonblocking */
fhp->set_pipe_non_blocking (fhp->get_device () == FH_PIPER ?
true : fhp->is_nonblocking ());
}
if (!fh->open_setup (openflags))
api_fatal ("open_setup failed, %E");
fh->usecount = 0;
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
set_std_handle (fd);
paranoid_printf ("fd %d, handle %p", fd, handle);
fh->post_open_setup (fd);
}
}
#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_DEV_FD:
fh = cnew (fhandler_dev_fd);
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_MQUEUE:
fh = cnew (fhandler_mqueue);
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)
{
fhandler_base *newfh = oldfh->clone ();
if (!newfh)
debug_printf ("clone failed");
else
{
if (!oldfh->archetype)
newfh->set_handle (NULL);
newfh->pc.close_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 || 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 ();
}
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