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newlib/winsup/cygwin/dtable.cc

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/* dtable.cc: file descriptor support.
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
2005, 2006, 2007, 2008 Red Hat, Inc.
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 <sys/socket.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 "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
#include "ntdll.h"
#include "shared_info.h"
static const NO_COPY 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)
char unknown_file[] = "some disk file";
const WCHAR DEV_NULL[] = L"\\Device\\Null";
const WCHAR DEVICE_PREFIX[] = L"\\device\\";
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);
}
void __stdcall
set_std_handle (int fd)
{
if (fd == 0)
SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_handle ());
else if (fd <= 2)
SetStdHandle (std_consts[fd], cygheap->fdtab[fd]->get_output_handle ());
}
int
dtable::extend (int howmuch)
{
int new_size = size + howmuch;
fhandler_base **newfds;
if (howmuch <= 0)
return 0;
if (new_size > (100 * NOFILE_INCR))
{
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 %d, fds %p", size, fds);
return 1;
}
void
dtable::get_debugger_info ()
{
if (being_debugged ())
{
char std[3][sizeof ("/dev/ttyNNNN")];
std[0][0] = std[1][0] = std [2][0] = '\0';
char buf[sizeof ("cYgstd %x") + 32];
sprintf (buf, "cYgstd %x %x %x", (unsigned) &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);
}
}
}
/* 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 ()
{
extern void set_console_ctty ();
/* Set these before trying to output anything from strace.
Also, always set them even if we're to pick up our parent's fds
in case they're missed. */
if (myself->cygstarted || ISSTATE (myself, PID_CYGPARENT))
{
tty_min *t = cygwin_shared->tty.get_tty (myself->ctty);
if (t && t->getpgid () == myself->pid && t->gethwnd ())
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). */
if (out == err)
{
/* Since this code is not invoked for forked tasks, we don't have
to worry about the close-on-exec flag here. */
if (!DuplicateHandle (hMainProc, out, hMainProc, &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");
}
}
init_std_file_from_handle (1, out);
init_std_file_from_handle (2, err);
/* Assign the console as the controlling tty for this process if we actually
have a console and no other controlling tty has been assigned. */
if (!fhandler_console::need_invisible () && myself->ctty < 0)
set_console_ctty ();
}
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 () == (unsigned) 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", i, fh->get_name ());
if (i < --farchetype)
archetypes[i] = archetypes[farchetype];
break;
}
delete fh;
}
int
dtable::find_unused_handle (int start)
{
do
{
for (size_t i = start; i < size; i++)
/* See if open -- no need for overhead of not_open */
if (fds[i] == NULL)
return i;
}
while (extend (NOFILE_INCR));
return -1;
}
void
dtable::release (int fd)
{
if (!not_open (fd))
{
fhandler_base *arch = fds[fd]->archetype;
delete fds[fd];
if (arch && !arch->usecount)
cygheap->fdtab.delete_archetype (arch);
fds[fd] = NULL;
}
}
extern "C" int
cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
DWORD myaccess)
{
if (fd == -1)
fd = cygheap->fdtab.find_unused_handle ();
fhandler_base *fh = build_fh_name (name);
cygheap->fdtab[fd] = fh;
fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
return fd;
}
void
dtable::init_std_file_from_handle (int fd, HANDLE handle)
{
CONSOLE_SCREEN_BUFFER_INFO buf;
struct sockaddr sa;
int sal = sizeof (sa);
DCB dcb;
unsigned bin = O_BINARY;
device dev;
tmp_pathbuf tp;
dev.devn = 0; /* FIXME: device */
first_fd_for_open = 0;
if (!not_open (fd))
return;
SetLastError (0);
DWORD access = 0;
DWORD ft = GetFileType (handle);
char name[NT_MAX_PATH];
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)
{
if (handle_to_fn (handle, name))
/* ok */;
else if (fd == 0)
dev = *piper_dev;
else
dev = *pipew_dev;
if (name[0])
access = FILE_CREATE_PIPE_INSTANCE;
}
else if (GetConsoleScreenBufferInfo (handle, &buf))
{
/* Console output */
if (ISSTATE (myself, PID_USETTY))
dev.parse (FH_TTY);
else
dev = *console_dev;
}
else if (GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
{
/* Console input */
if (ISSTATE (myself, PID_USETTY))
dev.parse (FH_TTY);
else
dev = *console_dev;
}
else if (wsock_started && getpeername ((SOCKET) handle, &sa, &sal) == 0)
/* socket */
dev = *tcp_dev;
else if (GetCommState (handle, &dcb))
/* serial */
dev.parse (DEV_TTYS_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)
cygheap->fdtab[fd] = fh;
if (name[0])
{
bin = fh->pc_binmode ();
if (!bin)
{
bin = fh->get_default_fmode (O_RDWR);
if (!bin && dev)
bin = O_BINARY;
}
}
if (dev == FH_TTY || dev == FH_CONSOLE)
access |= GENERIC_READ | GENERIC_WRITE;
else if (fd == 0)
access |= GENERIC_READ;
else
access |= GENERIC_WRITE; /* Should be rdwr for stderr but not sure that's
possible for some versions of handles */
fh->init (handle, access, bin);
set_std_handle (fd);
paranoid_printf ("fd %d, handle %p", fd, handle);
}
}
#define cnew(name) new ((void *) ccalloc (HEAP_FHANDLER, 1, sizeof (name))) name
static fhandler_base *
build_fh_name_worker (path_conv& pc, HANDLE h, unsigned opt, suffix_info *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;
}
if (!pc.exists () && h)
pc.fillin (h);
return build_fh_pc (pc);
}
fhandler_base *
build_fh_name (const char *name, HANDLE h, unsigned opt, suffix_info *si)
{
path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
return build_fh_name_worker (pc, h, opt, si);
}
#if 0 /* Not needed yet */
#define cnew(name) new ((void *) ccalloc (HEAP_FHANDLER, 1, sizeof (name))) name
fhandler_base *
build_fh_name (const UNICODE_STRING *name, HANDLE h, unsigned opt, suffix_info *si)
{
path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
return build_fh_name_worker (pc, h, opt, si);
}
#endif
fhandler_base *
build_fh_dev (const device& dev, const char *unix_name)
{
path_conv pc (dev);
if (unix_name)
pc.set_normalized_path (unix_name);
else
pc.set_normalized_path (dev.name);
return build_fh_pc (pc);
}
#define fh_unset ((fhandler_base *) 1)
fhandler_base *
build_fh_pc (path_conv& pc)
{
fhandler_base *fh = fh_unset;
switch (pc.dev.major)
{
case DEV_TTYS_MAJOR:
fh = cnew (fhandler_tty_slave) ();
break;
case DEV_TTYM_MAJOR:
fh = cnew (fhandler_tty_master) ();
break;
case DEV_CYGDRIVE_MAJOR:
fh = cnew (fhandler_cygdrive) ();
break;
case DEV_FLOPPY_MAJOR:
case DEV_CDROM_MAJOR:
case DEV_SD_MAJOR:
case DEV_SD1_MAJOR:
case DEV_SD2_MAJOR:
case DEV_SD3_MAJOR:
case DEV_SD4_MAJOR:
case DEV_SD5_MAJOR:
case DEV_SD6_MAJOR:
case DEV_SD7_MAJOR:
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;
default:
switch (pc.dev)
{
case FH_CONSOLE:
case FH_CONIN:
case FH_CONOUT:
fh = cnew (fhandler_console) ();
break;
case FH_PTYM:
fh = cnew (fhandler_pty_master) ();
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_TCP:
case FH_UDP:
case FH_ICMP:
case FH_UNIX:
case FH_STREAM:
case FH_DGRAM:
fh = cnew (fhandler_socket) ();
break;
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_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:
fh = cnew (fhandler_process) ();
break;
case FH_PROCNET:
fh = cnew (fhandler_procnet) ();
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)
fh->set_name (pc);
else
set_errno (EMFILE);
debug_printf ("fh %p", fh);
return fh;
}
fhandler_base *
dtable::dup_worker (fhandler_base *oldfh)
{
fhandler_base *newfh = build_fh_pc (oldfh->pc);
if (!newfh)
debug_printf ("build_fh_pc failed");
else
{
*newfh = *oldfh;
newfh->set_io_handle (NULL);
if (oldfh->dup (newfh))
{
cfree (newfh);
debug_printf ("oldfh->dup failed");
}
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::dup2 (int oldfd, int newfd)
{
int res = -1;
fhandler_base *newfh = NULL; // = NULL to avoid an incorrect warning
MALLOC_CHECK;
debug_printf ("dup2 (%d, %d)", oldfd, newfd);
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 (newfd == oldfd)
{
res = 0;
goto done;
}
if ((newfh = dup_worker (fds[oldfd])) == NULL)
{
res = -1;
goto done;
}
debug_printf ("newfh->io_handle %p, oldfh->io_handle %p",
newfh->get_io_handle (), fds[oldfd]->get_io_handle ());
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 = dup2 (%d, %d)", res, oldfd, newfd);
return res;
}
select_record *
dtable::select_read (int fd, select_record *s)
{
if (not_open (fd))
{
set_errno (EBADF);
return NULL;
}
fhandler_base *fh = fds[fd];
s = fh->select_read (s);
s->fd = fd;
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return s;
}
select_record *
dtable::select_write (int fd, select_record *s)
{
if (not_open (fd))
{
set_errno (EBADF);
return NULL;
}
fhandler_base *fh = fds[fd];
s = fh->select_write (s);
s->fd = fd;
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return s;
}
select_record *
dtable::select_except (int fd, select_record *s)
{
if (not_open (fd))
{
set_errno (EBADF);
return NULL;
}
fhandler_base *fh = fds[fd];
s = fh->select_except (s);
s->fd = fd;
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return s;
}
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 (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;
OBJECT_NAME_INFORMATION dummy_oni;
WCHAR *maxmatchdos = NULL;
int maxmatchlen = 0;
NtQueryObject (h, ObjectNameInformation, &dummy_oni, sizeof (dummy_oni), &len);
if (!len)
debug_printf ("NtQueryObject failed 1");
else
{
OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) alloca (len + sizeof (WCHAR));
NTSTATUS res = NtQueryObject (h, ObjectNameInformation, ntfn, len, NULL);
if (!NT_SUCCESS (res))
debug_printf ("NtQueryObject failed 2");
// 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 (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-");
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;
}
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