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Return unique inode numbers when calling stat/fstat on pipes and IP sockets

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* fhandler.h (class fhandler_base): Convert unique_id to int64_t.
        (fhandler_base::set_ino): New protected inline method.
        (fhandler_base::get_unique_id): Convert to int64_t.
        (fhandler_base::set_unique_id): New inline method taking int64_t.
        (fhandler_pipe::fstat): Declare.
        (fhandler_pipe::init): Take extra parameter.
        (fhandler_pipe::create): Ditto.
        * fhandler_socket.cc (fhandler_socket::init_events): Set inode number
        to serial number.
        (fhandler_socket::fstat): Set device to DEV_TCP_MAJOR.  Create st_ino
        from get_ino.
        * include/cygwin/signal.h (struct _sigcommune): Replace
        _si_pipe_fhandler with _si_pipe_unique_id.
        * pinfo.h (_pinfo::pipe_fhandler): Take unique id instead of HANDLE.
        * pinfo.cc (commune_process): Accommodate change to _si_pipe_unique_id.
        (_pinfo::commune_request): Ditto.
        (_pinfo::pipe_fhandler): Ditto.
        * pipe.cc (fhandler_pipe::init): Take unique id as argument and set
        inode number and unique_id from there.
        (fhandler_pipe::open): Rework to find any matching pipe from unique
        id in filename.
        (fhandler_pipe::get_proc_fd_name): Create filename using inode number.
        (fhandler_pipe::create): Generate and return unique id from process pid
        and pipe_unique_id.  In outer method, call init with additional unique
        id as parameter.
        (fhandler_pipe::fstat): New method.
        (pipe_worker): Accommodate using 64 bit inode number in filename.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-01-11 12:35:41 +01:00
parent 20ddde2f55
commit a10d969231
7 changed files with 88 additions and 45 deletions
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11
winsup/cygwin/fhandler.h
View File

@ -182,8 +182,9 @@ class fhandler_base
size_t rabuflen;
/* Used for advisory file locking. See flock.cc. */
long long unique_id;
int64_t unique_id;
void del_my_locks (del_lock_called_from);
void set_ino (ino_t i) { ino = i; }
HANDLE read_state;
@ -304,7 +305,7 @@ class fhandler_base
const char *get_win32_name () { return pc.get_win32 (); }
virtual dev_t get_dev () { return get_device (); }
ino_t get_ino () { return ino ?: ino = hash_path_name (0, pc.get_nt_native_path ()); }
long long get_unique_id () const { return unique_id; }
int64_t get_unique_id () const { return unique_id; }
/* Returns name used for /proc/<pid>/fd in buf. */
virtual char *get_proc_fd_name (char *buf);
@ -319,6 +320,7 @@ class fhandler_base
int open_null (int flags);
virtual int open (int, mode_t);
virtual void open_setup (int flags);
void set_unique_id (int64_t u) { unique_id = u; }
void set_unique_id () { NtAllocateLocallyUniqueId ((PLUID) &unique_id); }
int close_with_arch ();
@ -731,13 +733,14 @@ public:
int open (int flags, mode_t mode = 0);
int dup (fhandler_base *child, int);
int ioctl (unsigned int cmd, void *);
int __reg2 fstat (struct stat *buf);
int __reg2 fstatvfs (struct statvfs *buf);
int __reg3 fadvise (off_t, off_t, int);
int __reg3 ftruncate (off_t, bool);
int init (HANDLE, DWORD, mode_t);
int init (HANDLE, DWORD, mode_t, int64_t);
static int create (fhandler_pipe *[2], unsigned, int);
static DWORD create (LPSECURITY_ATTRIBUTES, HANDLE *, HANDLE *, DWORD,
const char *, DWORD);
const char *, DWORD, int64_t *unique_id = NULL);
fhandler_pipe (void *) {}
void copyto (fhandler_base *x)

5
winsup/cygwin/fhandler_socket.cc
View File

@ -594,6 +594,7 @@ fhandler_socket::init_events ()
InterlockedIncrement (&socket_serial_number);
if (!new_serial_number) /* 0 is reserved for global mutex */
InterlockedIncrement (&socket_serial_number);
set_ino (new_serial_number);
RtlInitUnicodeString (&uname, sock_shared_name (name, new_serial_number));
InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT | OBJ_OPENIF,
get_session_parent_dir (),
@ -937,8 +938,8 @@ fhandler_socket::fstat (struct stat *buf)
res = fhandler_base::fstat (buf);
if (!res)
{
buf->st_dev = 0;
buf->st_ino = (ino_t) ((uintptr_t) get_handle ());
buf->st_dev = FHDEV (DEV_TCP_MAJOR, 0);
buf->st_ino = (ino_t) get_ino ();
buf->st_mode = S_IFSOCK | S_IRWXU | S_IRWXG | S_IRWXO;
buf->st_size = 0;
}

2
winsup/cygwin/include/cygwin/signal.h
View File

@ -188,7 +188,7 @@ struct _sigcommune
__extension__ union
{
int _si_fd;
void *_si_pipe_fhandler;
int64_t _si_pipe_unique_id;
char *_si_str;
};
};

10
winsup/cygwin/pinfo.cc
View File

@ -622,11 +622,11 @@ commune_process (void *arg)
case PICOM_PIPE_FHANDLER:
{
sigproc_printf ("processing PICOM_FDS");
HANDLE hdl = si._si_commune._si_pipe_fhandler;
int64_t unique_id = si._si_commune._si_pipe_unique_id;
unsigned int n = 0;
cygheap_fdenum cfd;
while (cfd.next () >= 0)
if (cfd->get_handle () == hdl)
if (cfd->get_unique_id () == unique_id)
{
fhandler_pipe *fh = cfd;
n = sizeof *fh;
@ -701,7 +701,7 @@ _pinfo::commune_request (__uint32_t code, ...)
switch (code)
{
case PICOM_PIPE_FHANDLER:
si._si_commune._si_pipe_fhandler = va_arg (args, HANDLE);
si._si_commune._si_pipe_unique_id = va_arg (args, int64_t);
break;
case PICOM_FD:
@ -781,13 +781,13 @@ out:
}
fhandler_pipe *
_pinfo::pipe_fhandler (HANDLE hdl, size_t &n)
_pinfo::pipe_fhandler (int64_t unique_id, size_t &n)
{
if (!this || !pid)
return NULL;
if (pid == myself->pid)
return NULL;
commune_result cr = commune_request (PICOM_PIPE_FHANDLER, hdl);
commune_result cr = commune_request (PICOM_PIPE_FHANDLER, unique_id);
n = cr.n;
return (fhandler_pipe *) cr.s;
}

2
winsup/cygwin/pinfo.h
View File

@ -103,7 +103,7 @@ public:
commune_result commune_request (__uint32_t, ...);
bool alive ();
fhandler_pipe *pipe_fhandler (HANDLE, size_t &);
fhandler_pipe *pipe_fhandler (int64_t, size_t &);
char *fd (int fd, size_t &);
char *fds (size_t &);
char *root (size_t &);

100
winsup/cygwin/pipe.cc
View File

@ -31,7 +31,7 @@ fhandler_pipe::fhandler_pipe ()
}
int
fhandler_pipe::init (HANDLE f, DWORD a, mode_t mode)
fhandler_pipe::init (HANDLE f, DWORD a, mode_t mode, int64_t uniq_id)
{
/* FIXME: Have to clean this up someday
FIXME: Do we have to check for both !get_win32_name() and
@ -54,6 +54,8 @@ fhandler_pipe::init (HANDLE f, DWORD a, mode_t mode)
a &= ~FILE_CREATE_PIPE_INSTANCE;
fhandler_base::init (f, a, mode);
close_on_exec (mode & O_CLOEXEC);
set_ino (uniq_id);
set_unique_id (uniq_id | !!(mode & GENERIC_WRITE));
if (opened_properly)
setup_overlapped ();
else
@ -66,27 +68,33 @@ extern "C" int sscanf (const char *, const char *, ...);
int
fhandler_pipe::open (int flags, mode_t mode)
{
HANDLE proc, pipe_hdl, nio_hdl = NULL;
fhandler_pipe *fh = NULL;
HANDLE proc, nio_hdl = NULL;
int64_t uniq_id;
fhandler_pipe *fh = NULL, *fhr = NULL, *fhw = NULL;
size_t size;
int pid, rwflags = (flags & O_ACCMODE);
bool inh;
bool got_one = false;
sscanf (get_name (), "/proc/%d/fd/pipe:[%lu]",
&pid, (unsigned long *) &pipe_hdl);
sscanf (get_name (), "/proc/%d/fd/pipe:[%lld]",
&pid, (long long *) &uniq_id);
if (pid == myself->pid)
{
cygheap_fdenum cfd (true);
while (cfd.next () >= 0)
{
if (cfd->get_handle () != pipe_hdl)
/* Windows doesn't allow to copy a pipe HANDLE with another access
mode. So we check for read and write side of pipe and try to
find the one matching the requested access mode. */
if (cfd->get_unique_id () == uniq_id)
got_one = true;
else if (cfd->get_unique_id () == uniq_id + 1)
got_one = true;
else
continue;
if ((rwflags == O_RDONLY && !(cfd->get_access () & GENERIC_READ))
|| (rwflags == O_WRONLY && !(cfd->get_access () & GENERIC_WRITE)))
{
set_errno (EACCES);
return 0;
}
continue;
cfd->copyto (this);
set_io_handle (NULL);
pc.reset_conv_handle ();
@ -94,7 +102,9 @@ fhandler_pipe::open (int flags, mode_t mode)
return 1;
return 0;
}
set_errno (ENOENT);
/* Found the pipe but access mode didn't match? EACCES.
Otherwise ENOENT */
set_errno (got_one ? EACCES : ENOENT);
return 0;
}
@ -109,27 +119,30 @@ fhandler_pipe::open (int flags, mode_t mode)
__seterrno ();
return 0;
}
if (!(fh = p->pipe_fhandler (pipe_hdl, size)) || !size)
fhr = p->pipe_fhandler (uniq_id, size);
if (fhr && rwflags == O_RDONLY)
fh = fhr;
else
{
set_errno (ENOENT);
goto out;
fhw = p->pipe_fhandler (uniq_id + 1, size);
if (fhw && rwflags == O_WRONLY)
fh = fhw;
}
/* Too bad, but Windows only allows the same access mode when dup'ing
the pipe. */
if ((rwflags == O_RDONLY && !(fh->get_access () & GENERIC_READ))
|| (rwflags == O_WRONLY && !(fh->get_access () & GENERIC_WRITE)))
if (!fh)
{
set_errno (EACCES);
/* Too bad, but Windows only allows the same access mode when dup'ing
the pipe. */
set_errno (fhr || fhw ? EACCES : ENOENT);
goto out;
}
inh = !(flags & O_CLOEXEC);
if (!DuplicateHandle (proc, pipe_hdl, GetCurrentProcess (), &nio_hdl,
0, inh, DUPLICATE_SAME_ACCESS))
if (!DuplicateHandle (proc, fh->get_handle (), GetCurrentProcess (),
&nio_hdl, 0, inh, DUPLICATE_SAME_ACCESS))
{
__seterrno ();
goto out;
}
init (nio_hdl, fh->get_access (), mode & O_TEXT ?: O_BINARY);
init (nio_hdl, fh->get_access (), mode & O_TEXT ?: O_BINARY, fh->get_ino ());
cfree (fh);
CloseHandle (proc);
return 1;
@ -168,7 +181,7 @@ fhandler_pipe::ftruncate (off_t length, bool allow_truncate)
char *
fhandler_pipe::get_proc_fd_name (char *buf)
{
__small_sprintf (buf, "pipe:[%lu]", get_handle ());
__small_sprintf (buf, "pipe:[%D]", get_ino ());
return buf;
}
@ -199,7 +212,8 @@ fhandler_pipe::dup (fhandler_base *child, int flags)
unlike CreatePipe, which returns a bool for success or failure. */
DWORD
fhandler_pipe::create (LPSECURITY_ATTRIBUTES sa_ptr, PHANDLE r, PHANDLE w,
DWORD psize, const char *name, DWORD open_mode)
DWORD psize, const char *name, DWORD open_mode,
int64_t *unique_id)
{
/* Default to error. */
if (r)
@ -241,8 +255,12 @@ fhandler_pipe::create (LPSECURITY_ATTRIBUTES sa_ptr, PHANDLE r, PHANDLE w,
{
static volatile ULONG pipe_unique_id;
if (!name)
__small_sprintf (pipename + len, "pipe-%p",
InterlockedIncrement ((LONG *) &pipe_unique_id));
{
LONG id = InterlockedIncrement ((LONG *) &pipe_unique_id);
__small_sprintf (pipename + len, "pipe-%p", id);
if (unique_id)
*unique_id = ((int64_t) id << 32 | GetCurrentProcessId ());
}
debug_printf ("name %s, size %u, mode %s", pipename, psize,
(pipe_mode & PIPE_TYPE_MESSAGE)
@ -341,8 +359,9 @@ fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode)
HANDLE r, w;
SECURITY_ATTRIBUTES *sa = sec_none_cloexec (mode);
int res = -1;
int64_t unique_id;
int ret = create (sa, &r, &w, psize, NULL, FILE_FLAG_OVERLAPPED);
int ret = create (sa, &r, &w, psize, NULL, FILE_FLAG_OVERLAPPED, &unique_id);
if (ret)
__seterrno_from_win_error (ret);
else if ((fhs[0] = (fhandler_pipe *) build_fh_dev (*piper_dev)) == NULL)
@ -358,8 +377,10 @@ fhandler_pipe::create (fhandler_pipe *fhs[2], unsigned psize, int mode)
else
{
mode |= mode & O_TEXT ?: O_BINARY;
fhs[0]->init (r, FILE_CREATE_PIPE_INSTANCE | GENERIC_READ, mode);
fhs[1]->init (w, FILE_CREATE_PIPE_INSTANCE | GENERIC_WRITE, mode);
fhs[0]->init (r, FILE_CREATE_PIPE_INSTANCE | GENERIC_READ, mode,
unique_id);
fhs[1]->init (w, FILE_CREATE_PIPE_INSTANCE | GENERIC_WRITE, mode,
unique_id);
res = 0;
}
@ -394,6 +415,21 @@ fhandler_pipe::ioctl (unsigned int cmd, void *p)
return 0;
}
int __reg2
fhandler_pipe::fstat (struct stat *buf)
{
int ret = fhandler_base::fstat (buf);
if (!ret)
{
buf->st_dev = FH_PIPE;
/* Don't use get_ino, it doesn't return 0 but a hash instead. */
if (!(buf->st_ino = get_unique_id ()))
sscanf (get_name (), "/proc/%*d/fd/pipe:[%lld]",
(long long *) &buf->st_ino);
}
return ret;
}
int __reg2
fhandler_pipe::fstatvfs (struct statvfs *sfs)
{
@ -410,10 +446,10 @@ pipe_worker (int filedes[2], unsigned int psize, int mode)
{
cygheap_fdnew fdin;
cygheap_fdnew fdout (fdin, false);
char buf[sizeof ("/dev/fd/pipe:[2147483647]")];
__small_sprintf (buf, "/dev/fd/pipe:[%d]", (int) fdin);
char buf[sizeof ("/dev/fd/pipe:[9223372036854775807]")];
__small_sprintf (buf, "/dev/fd/pipe:[%D]", fhs[0]->get_ino ());
fhs[0]->pc.set_posix (buf);
__small_sprintf (buf, "pipe:[%d]", (int) fdout);
__small_sprintf (buf, "pipe:[%D]", fhs[1]->get_ino ());
fhs[1]->pc.set_posix (buf);
fdin = fhs[0];
fdout = fhs[1];

3
winsup/cygwin/release/2.4.0
View File

@ -81,3 +81,6 @@ Bug Fixes
- *Always* zero out descriptor arrays when returning from select due to
timeout, per POSIX.
Addresses: https://cygwin.com/ml/cygwin/2015-12/msg00332.html
- Return unique inode numbers when calling stat/fstat on pipes and IP sockets.
Addresses: https://cygwin.com/ml/cygwin/2015-12/msg00310.html