05297cca5f
an already sparse file. Drop check for FILE_SUPPORTS_SPARSE_FILES flag. Explicitely set FILE_ATTRIBUTE_SPARSE_FILE attribute in cached attributes. (fhandler_base::lseek): Only set did_lseek if sparseness is supported. * fhandler_disk_file.cc (fhandler_disk_file::ftruncate): Don't attempt to sparsify an already sparse file. Explicitely set FILE_ATTRIBUTE_SPARSE_FILE attribute in cached attributes. * mount.cc (oopt): Add "sparse" flag. (fillout_mntent): Ditto. * path.h (enum path_types): Add PATH_SPARSE. (path_conv::support_sparse): New method. (path_conv::fs_flags): Constify. (path_conv::fs_name_len): Ditto. include/sys/mount.h: Replace unused MOUNT_MIXED flag with MOUNT_SPARSE.
2102 lines
49 KiB
C++
2102 lines
49 KiB
C++
/* fhandler.cc. See console.cc for fhandler_console functions.
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|
|
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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, 2012 Red Hat, Inc.
|
|
|
|
This file is part of Cygwin.
|
|
|
|
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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#include "winsup.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/uio.h>
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#include <sys/acl.h>
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#include <sys/param.h>
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "security.h"
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#include "cygwin/version.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "pinfo.h"
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#include <assert.h>
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#include <winioctl.h>
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#include "ntdll.h"
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#include "cygtls.h"
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#include "sigproc.h"
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#include "shared_info.h"
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#include <asm/socket.h>
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#include "cygwait.h"
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#define MAX_OVERLAPPED_WRITE_LEN (64 * 1024 * 1024)
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#define MIN_OVERLAPPED_WRITE_LEN (1 * 1024 * 1024)
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static const int CHUNK_SIZE = 1024; /* Used for crlf conversions */
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struct __cygwin_perfile *perfile_table;
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HANDLE NO_COPY fhandler_base_overlapped::asio_done;
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LONG NO_COPY fhandler_base_overlapped::asio_close_counter;
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void
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fhandler_base::reset (const fhandler_base *from)
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{
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pc << from->pc;
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rabuf = NULL;
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ralen = 0;
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raixget = 0;
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raixput = 0;
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rabuflen = 0;
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_refcnt = 0;
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}
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int
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fhandler_base::puts_readahead (const char *s, size_t len)
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|
{
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int success = 1;
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while ((len == (size_t) -1 ? *s : len--)
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&& (success = put_readahead (*s++) > 0))
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continue;
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return success;
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}
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int
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fhandler_base::put_readahead (char value)
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|
{
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char *newrabuf;
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if (raixput < rabuflen)
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/* Nothing to do */;
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else if ((newrabuf = (char *) realloc (rabuf, rabuflen += 32)))
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rabuf = newrabuf;
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else
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return 0;
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rabuf[raixput++] = value;
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ralen++;
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return 1;
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}
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int
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fhandler_base::get_readahead ()
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|
{
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int chret = -1;
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if (raixget < ralen)
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chret = ((unsigned char) rabuf[raixget++]) & 0xff;
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/* FIXME - not thread safe */
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if (raixget >= ralen)
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raixget = raixput = ralen = 0;
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return chret;
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}
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int
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fhandler_base::peek_readahead (int queryput)
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|
{
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int chret = -1;
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if (!queryput && raixget < ralen)
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chret = ((unsigned char) rabuf[raixget]) & 0xff;
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else if (queryput && raixput > 0)
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chret = ((unsigned char) rabuf[raixput - 1]) & 0xff;
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return chret;
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|
}
|
|
|
|
void
|
|
fhandler_base::set_readahead_valid (int val, int ch)
|
|
{
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if (!val)
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ralen = raixget = raixput = 0;
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if (ch != -1)
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put_readahead (ch);
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|
}
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|
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|
int
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|
fhandler_base::eat_readahead (int n)
|
|
{
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|
int oralen = ralen;
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if (n < 0)
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n = ralen;
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if (n > 0 && ralen)
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|
{
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if ((int) (ralen -= n) < 0)
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ralen = 0;
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if (raixget >= ralen)
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raixget = raixput = ralen = 0;
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else if (raixput > ralen)
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raixput = ralen;
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}
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|
return oralen;
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}
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int
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fhandler_base::get_readahead_into_buffer (char *buf, size_t buflen)
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|
{
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int ch;
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int copied_chars = 0;
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while (buflen)
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if ((ch = get_readahead ()) < 0)
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break;
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else
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|
{
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buf[copied_chars++] = (unsigned char)(ch & 0xff);
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buflen--;
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}
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return copied_chars;
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}
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/* Record the file name. and name hash */
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void
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fhandler_base::set_name (path_conv &in_pc)
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{
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pc << in_pc;
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|
}
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char *fhandler_base::get_proc_fd_name (char *buf)
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|
{
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if (get_name ())
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return strcpy (buf, get_name ());
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if (dev ().name)
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return strcpy (buf, dev ().name);
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return strcpy (buf, "");
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}
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/* Detect if we are sitting at EOF for conditions where Windows
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returns an error but UNIX doesn't. */
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int __stdcall
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|
is_at_eof (HANDLE h)
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|
{
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IO_STATUS_BLOCK io;
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FILE_POSITION_INFORMATION fpi;
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FILE_STANDARD_INFORMATION fsi;
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if (NT_SUCCESS (NtQueryInformationFile (h, &io, &fsi, sizeof fsi,
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FileStandardInformation))
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&& NT_SUCCESS (NtQueryInformationFile (h, &io, &fpi, sizeof fpi,
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FilePositionInformation))
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&& fsi.EndOfFile.QuadPart == fpi.CurrentByteOffset.QuadPart)
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return 1;
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return 0;
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}
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void
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fhandler_base::set_flags (int flags, int supplied_bin)
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{
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int bin;
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int fmode;
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debug_printf ("flags %p, supplied_bin %p", flags, supplied_bin);
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if ((bin = flags & (O_BINARY | O_TEXT)))
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debug_printf ("O_TEXT/O_BINARY set in flags %p", bin);
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else if (rbinset () && wbinset ())
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bin = rbinary () ? O_BINARY : O_TEXT; // FIXME: Not quite right
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else if ((fmode = get_default_fmode (flags)) & O_BINARY)
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bin = O_BINARY;
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else if (fmode & O_TEXT)
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bin = O_TEXT;
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else if (supplied_bin)
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|
bin = supplied_bin;
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else
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bin = wbinary () || rbinary () ? O_BINARY : O_TEXT;
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|
openflags = flags | bin;
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bin &= O_BINARY;
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|
rbinary (bin ? true : false);
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|
wbinary (bin ? true : false);
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|
syscall_printf ("filemode set to %s", bin ? "binary" : "text");
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|
}
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|
|
/* Normal file i/o handlers. */
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/* Cover function to ReadFile to achieve (as much as possible) Posix style
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|
semantics and use of errno. */
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void __stdcall
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fhandler_base::raw_read (void *ptr, size_t& ulen)
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|
{
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|
#define bytes_read ulen
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int try_noreserve = 1;
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|
DWORD len = ulen;
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|
|
|
retry:
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|
ulen = (size_t) -1;
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|
BOOL res = ReadFile (get_handle (), ptr, len, (DWORD *) &ulen, NULL);
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|
if (!res)
|
|
{
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|
/* Some errors are not really errors. Detect such cases here. */
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|
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|
DWORD errcode = GetLastError ();
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|
switch (errcode)
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|
{
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|
case ERROR_BROKEN_PIPE:
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|
/* This is really EOF. */
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|
bytes_read = 0;
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|
break;
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case ERROR_MORE_DATA:
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|
/* `bytes_read' is supposedly valid. */
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|
break;
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|
case ERROR_NOACCESS:
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if (is_at_eof (get_handle ()))
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{
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bytes_read = 0;
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break;
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}
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if (try_noreserve)
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{
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|
try_noreserve = 0;
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|
switch (mmap_is_attached_or_noreserve (ptr, len))
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|
{
|
|
case MMAP_NORESERVE_COMMITED:
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|
goto retry;
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|
case MMAP_RAISE_SIGBUS:
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|
raise(SIGBUS);
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|
case MMAP_NONE:
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|
break;
|
|
}
|
|
}
|
|
/*FALLTHRU*/
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|
case ERROR_INVALID_FUNCTION:
|
|
case ERROR_INVALID_PARAMETER:
|
|
case ERROR_INVALID_HANDLE:
|
|
if (pc.isdir ())
|
|
{
|
|
set_errno (EISDIR);
|
|
bytes_read = (size_t) -1;
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|
break;
|
|
}
|
|
default:
|
|
syscall_printf ("ReadFile %s(%p) failed, %E", get_name (), get_handle ());
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|
__seterrno_from_win_error (errcode);
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|
bytes_read = (size_t) -1;
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|
break;
|
|
}
|
|
}
|
|
#undef bytes_read
|
|
}
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|
|
|
/* Cover function to WriteFile to provide Posix interface and semantics
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|
(as much as possible). */
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|
ssize_t __stdcall
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|
fhandler_base::raw_write (const void *ptr, size_t len)
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|
{
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|
NTSTATUS status;
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|
IO_STATUS_BLOCK io;
|
|
static _RDATA LARGE_INTEGER off_current =
|
|
{ QuadPart:FILE_USE_FILE_POINTER_POSITION };
|
|
static _RDATA LARGE_INTEGER off_append =
|
|
{ QuadPart:FILE_WRITE_TO_END_OF_FILE };
|
|
|
|
status = NtWriteFile (get_output_handle (), NULL, NULL, NULL, &io,
|
|
(PVOID) ptr, len,
|
|
(get_flags () & O_APPEND) ? &off_append : &off_current,
|
|
NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
if (get_errno () == EPIPE)
|
|
raise (SIGPIPE);
|
|
return -1;
|
|
}
|
|
return io.Information;
|
|
}
|
|
|
|
int
|
|
fhandler_base::get_default_fmode (int flags)
|
|
{
|
|
int fmode = __fmode;
|
|
if (perfile_table)
|
|
{
|
|
size_t nlen = strlen (get_name ());
|
|
unsigned accflags = (flags & O_ACCMODE);
|
|
for (__cygwin_perfile *pf = perfile_table; pf->name; pf++)
|
|
if (!*pf->name && (pf->flags & O_ACCMODE) == accflags)
|
|
{
|
|
fmode = pf->flags & ~O_ACCMODE;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
size_t pflen = strlen (pf->name);
|
|
const char *stem = get_name () + nlen - pflen;
|
|
if (pflen > nlen || (stem != get_name () && !isdirsep (stem[-1])))
|
|
continue;
|
|
else if ((pf->flags & O_ACCMODE) == accflags
|
|
&& pathmatch (stem, pf->name, !!pc.objcaseinsensitive ()))
|
|
{
|
|
fmode = pf->flags & ~O_ACCMODE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return fmode;
|
|
}
|
|
|
|
bool
|
|
fhandler_base::device_access_denied (int flags)
|
|
{
|
|
int mode = 0;
|
|
|
|
if (flags & O_RDWR)
|
|
mode |= R_OK | W_OK;
|
|
if (flags & (O_WRONLY | O_APPEND))
|
|
mode |= W_OK;
|
|
if (!mode)
|
|
mode |= R_OK;
|
|
|
|
return fhaccess (mode, true);
|
|
}
|
|
|
|
int
|
|
fhandler_base::fhaccess (int flags, bool effective)
|
|
{
|
|
int res = -1;
|
|
if (error ())
|
|
{
|
|
set_errno (error ());
|
|
goto done;
|
|
}
|
|
|
|
if (!exists ())
|
|
{
|
|
set_errno (ENOENT);
|
|
goto done;
|
|
}
|
|
|
|
if (!(flags & (R_OK | W_OK | X_OK)))
|
|
return 0;
|
|
|
|
if (is_fs_special ())
|
|
/* short circuit */;
|
|
else if (has_attribute (FILE_ATTRIBUTE_READONLY) && (flags & W_OK)
|
|
&& !pc.isdir ())
|
|
goto eaccess_done;
|
|
else if (has_acls ())
|
|
{
|
|
res = check_file_access (pc, flags, effective);
|
|
goto done;
|
|
}
|
|
else if (get_device () == FH_REGISTRY && open (O_RDONLY, 0) && get_handle ())
|
|
{
|
|
res = check_registry_access (get_handle (), flags, effective);
|
|
close ();
|
|
return res;
|
|
}
|
|
|
|
struct __stat64 st;
|
|
if (fstat (&st))
|
|
goto done;
|
|
|
|
if (flags & R_OK)
|
|
{
|
|
if (st.st_uid == (effective ? myself->uid : cygheap->user.real_uid))
|
|
{
|
|
if (!(st.st_mode & S_IRUSR))
|
|
goto eaccess_done;
|
|
}
|
|
else if (st.st_gid == (effective ? myself->gid : cygheap->user.real_gid))
|
|
{
|
|
if (!(st.st_mode & S_IRGRP))
|
|
goto eaccess_done;
|
|
}
|
|
else if (!(st.st_mode & S_IROTH))
|
|
goto eaccess_done;
|
|
}
|
|
|
|
if (flags & W_OK)
|
|
{
|
|
if (st.st_uid == (effective ? myself->uid : cygheap->user.real_uid))
|
|
{
|
|
if (!(st.st_mode & S_IWUSR))
|
|
goto eaccess_done;
|
|
}
|
|
else if (st.st_gid == (effective ? myself->gid : cygheap->user.real_gid))
|
|
{
|
|
if (!(st.st_mode & S_IWGRP))
|
|
goto eaccess_done;
|
|
}
|
|
else if (!(st.st_mode & S_IWOTH))
|
|
goto eaccess_done;
|
|
}
|
|
|
|
if (flags & X_OK)
|
|
{
|
|
if (st.st_uid == (effective ? myself->uid : cygheap->user.real_uid))
|
|
{
|
|
if (!(st.st_mode & S_IXUSR))
|
|
goto eaccess_done;
|
|
}
|
|
else if (st.st_gid == (effective ? myself->gid : cygheap->user.real_gid))
|
|
{
|
|
if (!(st.st_mode & S_IXGRP))
|
|
goto eaccess_done;
|
|
}
|
|
else if (!(st.st_mode & S_IXOTH))
|
|
goto eaccess_done;
|
|
}
|
|
|
|
res = 0;
|
|
goto done;
|
|
|
|
eaccess_done:
|
|
set_errno (EACCES);
|
|
done:
|
|
if (!res && (flags & W_OK) && get_device () == FH_FS
|
|
&& (pc.fs_flags () & FILE_READ_ONLY_VOLUME))
|
|
{
|
|
set_errno (EROFS);
|
|
res = -1;
|
|
}
|
|
debug_printf ("returning %d", res);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_base::open_with_arch (int flags, mode_t mode)
|
|
{
|
|
int res;
|
|
if (!(res = (archetype && archetype->io_handle)
|
|
|| open (flags, (mode & 07777) & ~cygheap->umask)))
|
|
{
|
|
if (archetype)
|
|
delete archetype;
|
|
}
|
|
else if (archetype)
|
|
{
|
|
if (!archetype->get_io_handle ())
|
|
{
|
|
copyto (archetype);
|
|
archetype_usecount (1);
|
|
archetype->archetype = NULL;
|
|
usecount = 0;
|
|
}
|
|
else
|
|
{
|
|
char *name;
|
|
/* Preserve any name (like /dev/tty) derived from build_fh_pc. */
|
|
if (!get_name ())
|
|
name = NULL;
|
|
else
|
|
{
|
|
name = (char *) alloca (strlen (get_name ()) + 1);
|
|
strcpy (name, get_name ());
|
|
}
|
|
fhandler_base *arch = archetype;
|
|
archetype->copyto (this);
|
|
if (name)
|
|
set_name (name);
|
|
archetype = arch;
|
|
archetype_usecount (1);
|
|
usecount = 0;
|
|
}
|
|
open_setup (flags);
|
|
}
|
|
|
|
close_on_exec (flags & O_CLOEXEC);
|
|
return res;
|
|
}
|
|
|
|
/* Open system call handler function. */
|
|
int
|
|
fhandler_base::open (int flags, mode_t mode)
|
|
{
|
|
int res = 0;
|
|
HANDLE fh;
|
|
ULONG file_attributes = 0;
|
|
ULONG shared = (get_major () == DEV_TAPE_MAJOR ? 0 : FILE_SHARE_VALID_FLAGS);
|
|
ULONG create_disposition;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
NTSTATUS status;
|
|
PFILE_FULL_EA_INFORMATION p = NULL;
|
|
ULONG plen = 0;
|
|
|
|
syscall_printf ("(%S, %p)", pc.get_nt_native_path (), flags);
|
|
|
|
pc.get_object_attr (attr, *sec_none_cloexec (flags));
|
|
|
|
options = FILE_OPEN_FOR_BACKUP_INTENT;
|
|
switch (query_open ())
|
|
{
|
|
case query_read_control:
|
|
access = READ_CONTROL;
|
|
break;
|
|
case query_read_attributes:
|
|
access = READ_CONTROL | FILE_READ_ATTRIBUTES;
|
|
break;
|
|
case query_write_control:
|
|
access = READ_CONTROL | WRITE_OWNER | WRITE_DAC | FILE_WRITE_ATTRIBUTES;
|
|
break;
|
|
case query_write_dac:
|
|
access = READ_CONTROL | WRITE_DAC | FILE_WRITE_ATTRIBUTES;
|
|
break;
|
|
case query_write_attributes:
|
|
access = READ_CONTROL | FILE_WRITE_ATTRIBUTES;
|
|
break;
|
|
default:
|
|
if ((flags & O_ACCMODE) == O_RDONLY)
|
|
access = GENERIC_READ;
|
|
else if ((flags & O_ACCMODE) == O_WRONLY)
|
|
access = GENERIC_WRITE | READ_CONTROL | FILE_READ_ATTRIBUTES;
|
|
else
|
|
access = GENERIC_READ | GENERIC_WRITE;
|
|
if (flags & O_SYNC)
|
|
options |= FILE_WRITE_THROUGH;
|
|
if (flags & O_DIRECT)
|
|
options |= FILE_NO_INTERMEDIATE_BUFFERING;
|
|
if (get_major () != DEV_SERIAL_MAJOR && get_major () != DEV_TAPE_MAJOR)
|
|
{
|
|
options |= FILE_SYNCHRONOUS_IO_NONALERT;
|
|
access |= SYNCHRONIZE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Don't use the FILE_OVERWRITE{_IF} flags here. See below for an
|
|
explanation, why that's not such a good idea. */
|
|
if ((flags & O_EXCL) && (flags & O_CREAT))
|
|
create_disposition = FILE_CREATE;
|
|
else
|
|
create_disposition = (flags & O_CREAT) ? FILE_OPEN_IF : FILE_OPEN;
|
|
|
|
if (get_device () == FH_FS)
|
|
{
|
|
/* Add the reparse point flag to native symlinks, otherwise we open the
|
|
target, not the symlink. This would break lstat. */
|
|
if (pc.is_rep_symlink ())
|
|
options |= FILE_OPEN_REPARSE_POINT;
|
|
|
|
if (pc.fs_is_nfs ())
|
|
{
|
|
/* Make sure we can read EAs of files on an NFS share. Also make
|
|
sure that we're going to act on the file itself, even if it's a
|
|
a symlink. */
|
|
access |= FILE_READ_EA;
|
|
if (query_open ())
|
|
{
|
|
if (query_open () >= query_write_control)
|
|
access |= FILE_WRITE_EA;
|
|
plen = sizeof nfs_aol_ffei;
|
|
p = (PFILE_FULL_EA_INFORMATION) &nfs_aol_ffei;
|
|
}
|
|
}
|
|
|
|
/* Starting with Windows 2000, when trying to overwrite an already
|
|
existing file with FILE_ATTRIBUTE_HIDDEN and/or FILE_ATTRIBUTE_SYSTEM
|
|
attribute set, CreateFile fails with ERROR_ACCESS_DENIED.
|
|
Per MSDN you have to create the file with the same attributes as
|
|
already specified for the file. */
|
|
if (((flags & O_CREAT) || create_disposition == FILE_OVERWRITE)
|
|
&& has_attribute (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM))
|
|
file_attributes |= pc.file_attributes ();
|
|
|
|
if (flags & O_CREAT)
|
|
{
|
|
file_attributes |= FILE_ATTRIBUTE_NORMAL;
|
|
|
|
if (pc.fs_is_nfs ())
|
|
{
|
|
/* When creating a file on an NFS share, we have to set the
|
|
file mode by writing a NFS fattr3 structure with the
|
|
correct mode bits set. */
|
|
access |= FILE_WRITE_EA;
|
|
plen = sizeof (FILE_FULL_EA_INFORMATION) + sizeof (NFS_V3_ATTR)
|
|
+ sizeof (fattr3);
|
|
p = (PFILE_FULL_EA_INFORMATION) alloca (plen);
|
|
p->NextEntryOffset = 0;
|
|
p->Flags = 0;
|
|
p->EaNameLength = sizeof (NFS_V3_ATTR) - 1;
|
|
p->EaValueLength = sizeof (fattr3);
|
|
strcpy (p->EaName, NFS_V3_ATTR);
|
|
fattr3 *nfs_attr = (fattr3 *) (p->EaName
|
|
+ p->EaNameLength + 1);
|
|
memset (nfs_attr, 0, sizeof (fattr3));
|
|
nfs_attr->type = NF3REG;
|
|
nfs_attr->mode = mode;
|
|
}
|
|
else if (!has_acls () && !(mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
|
|
/* If mode has no write bits set, and ACLs are not used, we set
|
|
the DOS R/O attribute. */
|
|
file_attributes |= FILE_ATTRIBUTE_READONLY;
|
|
/* The file attributes are needed for later use in, e.g. fchmod. */
|
|
pc.file_attributes (file_attributes);
|
|
/* Never set the WRITE_DAC flag here. Calls to fstat may return
|
|
wrong st_ctime information after calls to fchmod, fchown, etc
|
|
because Windows only guarantees the update of metadata when
|
|
the handle is closed or flushed. However, flushing the file
|
|
on every fstat to enforce POSIXy stat behaviour is excessivly
|
|
slow, compared to an extra open/close to change the file's
|
|
security descriptor. */
|
|
}
|
|
}
|
|
|
|
status = NtCreateFile (&fh, access, &attr, &io, NULL, file_attributes, shared,
|
|
create_disposition, options, p, plen);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
/* Trying to create a directory should return EISDIR, not ENOENT. */
|
|
PUNICODE_STRING upath = pc.get_nt_native_path ();
|
|
if (status == STATUS_OBJECT_NAME_INVALID && (flags & O_CREAT)
|
|
&& upath->Buffer[upath->Length / sizeof (WCHAR) - 1] == '\\')
|
|
set_errno (EISDIR);
|
|
else
|
|
__seterrno_from_nt_status (status);
|
|
if (!nohandle ())
|
|
goto done;
|
|
}
|
|
|
|
/* Always create files using a NULL SD. Create correct permission bits
|
|
afterwards, maintaining the owner and group information just like chmod.
|
|
|
|
This is done for two reasons.
|
|
|
|
On Windows filesystems we need to create the file with default
|
|
permissions to allow inheriting ACEs. When providing an explicit DACL
|
|
in calls to [Nt]CreateFile, the created file will not inherit default
|
|
permissions from the parent object. This breaks not only Windows
|
|
inheritance, but also POSIX ACL inheritance.
|
|
|
|
Another reason to do this are remote shares. Files on a remote share
|
|
are created as the user used for authentication. In a domain that's
|
|
usually the user you're logged in as. Outside of a domain you're
|
|
authenticating using a local user account on the sharing machine.
|
|
If the SIDs of the client machine are used, that's entirely
|
|
unexpected behaviour. Doing it like we do here creates the expected SD
|
|
in a domain as well as on standalone servers.
|
|
This is the result of a discussion on the samba-technical list, starting at
|
|
http://lists.samba.org/archive/samba-technical/2008-July/060247.html */
|
|
if (io.Information == FILE_CREATED && has_acls ())
|
|
set_file_attribute (fh, pc, ILLEGAL_UID, ILLEGAL_GID, S_JUSTCREATED | mode);
|
|
|
|
/* If you O_TRUNC a file on Linux, the data is truncated, but the EAs are
|
|
preserved. If you open a file on Windows with FILE_OVERWRITE{_IF} or
|
|
FILE_SUPERSEDE, all streams are truncated, including the EAs. So we don't
|
|
use the FILE_OVERWRITE{_IF} flags, but instead just open the file and set
|
|
the size of the data stream explicitely to 0. Apart from being more Linux
|
|
compatible, this implementation has the pleasant side-effect to be more
|
|
than 5% faster than using FILE_OVERWRITE{_IF} (tested on W7 32 bit). */
|
|
if ((flags & O_TRUNC)
|
|
&& (flags & O_ACCMODE) != O_RDONLY
|
|
&& io.Information != FILE_CREATED
|
|
&& get_device () == FH_FS)
|
|
{
|
|
FILE_END_OF_FILE_INFORMATION feofi = { EndOfFile:{ QuadPart:0 } };
|
|
status = NtSetInformationFile (fh, &io, &feofi, sizeof feofi,
|
|
FileEndOfFileInformation);
|
|
/* In theory, truncating the file should never fail, since the opened
|
|
handle has FILE_WRITE_DATA permissions, which is all you need to
|
|
be allowed to truncate a file. Better safe than sorry. */
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
NtClose (fh);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
set_io_handle (fh);
|
|
set_flags (flags, pc.binmode ());
|
|
|
|
res = 1;
|
|
set_open_status ();
|
|
done:
|
|
debug_printf ("%x = NtCreateFile "
|
|
"(%p, %x, %S, io, NULL, %x, %x, %x, %x, NULL, 0)",
|
|
status, fh, access, pc.get_nt_native_path (), file_attributes,
|
|
shared, create_disposition, options);
|
|
|
|
syscall_printf ("%d = fhandler_base::open(%S, %p)",
|
|
res, pc.get_nt_native_path (), flags);
|
|
return res;
|
|
}
|
|
|
|
/* states:
|
|
open buffer in binary mode? Just do the read.
|
|
|
|
open buffer in text mode? Scan buffer for control zs and handle
|
|
the first one found. Then scan buffer, converting every \r\n into
|
|
an \n. If last char is an \r, look ahead one more char, if \n then
|
|
modify \r, if not, remember char.
|
|
*/
|
|
void __stdcall
|
|
fhandler_base::read (void *in_ptr, size_t& len)
|
|
{
|
|
char *ptr = (char *) in_ptr;
|
|
ssize_t copied_chars = get_readahead_into_buffer (ptr, len);
|
|
|
|
if (copied_chars)
|
|
{
|
|
len = (size_t) copied_chars;
|
|
goto out;
|
|
}
|
|
|
|
len -= copied_chars;
|
|
if (!len)
|
|
{
|
|
len = (size_t) copied_chars;
|
|
goto out;
|
|
}
|
|
|
|
raw_read (ptr + copied_chars, len);
|
|
if (!copied_chars)
|
|
/* nothing */;
|
|
else if ((ssize_t) len > 0)
|
|
len += copied_chars;
|
|
else
|
|
len = copied_chars;
|
|
|
|
if (rbinary () || (ssize_t) len <= 0)
|
|
goto out;
|
|
|
|
/* Scan buffer and turn \r\n into \n */
|
|
char *src, *dst, *end;
|
|
src = (char *) ptr;
|
|
dst = (char *) ptr;
|
|
end = src + len - 1;
|
|
|
|
/* Read up to the last but one char - the last char needs special handling */
|
|
while (src < end)
|
|
{
|
|
if (*src == '\r' && src[1] == '\n')
|
|
src++;
|
|
*dst++ = *src++;
|
|
}
|
|
|
|
/* If not beyond end and last char is a '\r' then read one more
|
|
to see if we should translate this one too */
|
|
if (src > end)
|
|
/* nothing */;
|
|
else if (*src != '\r')
|
|
*dst++ = *src;
|
|
else
|
|
{
|
|
char c1;
|
|
size_t c1len = 1;
|
|
raw_read (&c1, c1len);
|
|
if (c1len <= 0)
|
|
/* nothing */;
|
|
else if (c1 == '\n')
|
|
*dst++ = '\n';
|
|
else
|
|
{
|
|
set_readahead_valid (1, c1);
|
|
*dst++ = *src;
|
|
}
|
|
}
|
|
|
|
len = dst - (char *) ptr;
|
|
|
|
#ifndef NOSTRACE
|
|
if (strace.active ())
|
|
{
|
|
char buf[16 * 6 + 1];
|
|
char *p = buf;
|
|
|
|
for (int i = 0; i < copied_chars && i < 16; ++i)
|
|
{
|
|
unsigned char c = ((unsigned char *) ptr)[i];
|
|
__small_sprintf (p, " %c", c);
|
|
p += strlen (p);
|
|
}
|
|
*p = '\0';
|
|
debug_printf ("read %d bytes (%s%s)", copied_chars, buf,
|
|
copied_chars > 16 ? " ..." : "");
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
debug_printf ("returning %d, %s mode", len, rbinary () ? "binary" : "text");
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_base::write (const void *ptr, size_t len)
|
|
{
|
|
int res;
|
|
|
|
if (did_lseek ())
|
|
{
|
|
IO_STATUS_BLOCK io;
|
|
FILE_POSITION_INFORMATION fpi;
|
|
FILE_STANDARD_INFORMATION fsi;
|
|
|
|
did_lseek (false); /* don't do it again */
|
|
|
|
if (!(get_flags () & O_APPEND)
|
|
&& !has_attribute (FILE_ATTRIBUTE_SPARSE_FILE)
|
|
&& NT_SUCCESS (NtQueryInformationFile (get_output_handle (),
|
|
&io, &fsi, sizeof fsi,
|
|
FileStandardInformation))
|
|
&& NT_SUCCESS (NtQueryInformationFile (get_output_handle (),
|
|
&io, &fpi, sizeof fpi,
|
|
FilePositionInformation))
|
|
&& fpi.CurrentByteOffset.QuadPart
|
|
>= fsi.EndOfFile.QuadPart + (128 * 1024))
|
|
{
|
|
/* If the file system supports sparse files and the application
|
|
is writing after a long seek beyond EOF, convert the file to
|
|
a sparse file. */
|
|
NTSTATUS status;
|
|
status = NtFsControlFile (get_output_handle (), NULL, NULL, NULL,
|
|
&io, FSCTL_SET_SPARSE, NULL, 0, NULL, 0);
|
|
if (NT_SUCCESS (status))
|
|
pc.file_attributes (pc.file_attributes ()
|
|
| FILE_ATTRIBUTE_SPARSE_FILE);
|
|
debug_printf ("%p = NtFsControlFile(%S, FSCTL_SET_SPARSE)",
|
|
status, pc.get_nt_native_path ());
|
|
}
|
|
}
|
|
|
|
if (wbinary ())
|
|
res = raw_write (ptr, len);
|
|
else
|
|
{
|
|
debug_printf ("text write");
|
|
/* This is the Microsoft/DJGPP way. Still not ideal, but it's
|
|
compatible.
|
|
Modified slightly by CGF 2000-10-07 */
|
|
|
|
int left_in_data = len;
|
|
char *data = (char *)ptr;
|
|
res = 0;
|
|
|
|
while (left_in_data > 0)
|
|
{
|
|
char buf[CHUNK_SIZE + 1], *buf_ptr = buf;
|
|
int left_in_buf = CHUNK_SIZE;
|
|
|
|
while (left_in_buf > 0 && left_in_data > 0)
|
|
{
|
|
char ch = *data++;
|
|
if (ch == '\n')
|
|
{
|
|
*buf_ptr++ = '\r';
|
|
left_in_buf--;
|
|
}
|
|
*buf_ptr++ = ch;
|
|
left_in_buf--;
|
|
left_in_data--;
|
|
if (left_in_data > 0 && ch == '\r' && *data == '\n')
|
|
{
|
|
*buf_ptr++ = *data++;
|
|
left_in_buf--;
|
|
left_in_data--;
|
|
}
|
|
}
|
|
|
|
/* We've got a buffer-full, or we're out of data. Write it out */
|
|
int nbytes;
|
|
int want = buf_ptr - buf;
|
|
if ((nbytes = raw_write (buf, want)) == want)
|
|
{
|
|
/* Keep track of how much written not counting additional \r's */
|
|
res = data - (char *)ptr;
|
|
continue;
|
|
}
|
|
|
|
if (nbytes == -1)
|
|
res = -1; /* Error */
|
|
else
|
|
res += nbytes; /* Partial write. Return total bytes written. */
|
|
break; /* All done */
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_base::readv (const struct iovec *const iov, const int iovcnt,
|
|
ssize_t tot)
|
|
{
|
|
assert (iov);
|
|
assert (iovcnt >= 1);
|
|
|
|
size_t len = tot;
|
|
if (iovcnt == 1)
|
|
{
|
|
len = iov->iov_len;
|
|
read (iov->iov_base, len);
|
|
return len;
|
|
}
|
|
|
|
if (tot == -1) // i.e. if not pre-calculated by the caller.
|
|
{
|
|
len = 0;
|
|
const struct iovec *iovptr = iov + iovcnt;
|
|
do
|
|
{
|
|
iovptr -= 1;
|
|
len += iovptr->iov_len;
|
|
}
|
|
while (iovptr != iov);
|
|
}
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
char *buf = (char *) malloc (len);
|
|
|
|
if (!buf)
|
|
{
|
|
set_errno (ENOMEM);
|
|
return -1;
|
|
}
|
|
|
|
read (buf, len);
|
|
ssize_t nbytes = (ssize_t) len;
|
|
|
|
const struct iovec *iovptr = iov;
|
|
|
|
char *p = buf;
|
|
while (nbytes > 0)
|
|
{
|
|
const int frag = MIN (nbytes, (ssize_t) iovptr->iov_len);
|
|
memcpy (iovptr->iov_base, p, frag);
|
|
p += frag;
|
|
iovptr += 1;
|
|
nbytes -= frag;
|
|
}
|
|
|
|
free (buf);
|
|
return len;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_base::writev (const struct iovec *const iov, const int iovcnt,
|
|
ssize_t tot)
|
|
{
|
|
assert (iov);
|
|
assert (iovcnt >= 1);
|
|
|
|
if (iovcnt == 1)
|
|
return write (iov->iov_base, iov->iov_len);
|
|
|
|
if (tot == -1) // i.e. if not pre-calculated by the caller.
|
|
{
|
|
tot = 0;
|
|
const struct iovec *iovptr = iov + iovcnt;
|
|
do
|
|
{
|
|
iovptr -= 1;
|
|
tot += iovptr->iov_len;
|
|
}
|
|
while (iovptr != iov);
|
|
}
|
|
|
|
assert (tot >= 0);
|
|
|
|
if (tot == 0)
|
|
return 0;
|
|
|
|
char *const buf = (char *) malloc (tot);
|
|
|
|
if (!buf)
|
|
{
|
|
set_errno (ENOMEM);
|
|
return -1;
|
|
}
|
|
|
|
char *bufptr = buf;
|
|
const struct iovec *iovptr = iov;
|
|
int nbytes = tot;
|
|
|
|
while (nbytes != 0)
|
|
{
|
|
const int frag = MIN (nbytes, (ssize_t) iovptr->iov_len);
|
|
memcpy (bufptr, iovptr->iov_base, frag);
|
|
bufptr += frag;
|
|
iovptr += 1;
|
|
nbytes -= frag;
|
|
}
|
|
ssize_t ret = write (buf, tot);
|
|
free (buf);
|
|
return ret;
|
|
}
|
|
|
|
_off64_t
|
|
fhandler_base::lseek (_off64_t offset, int whence)
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
FILE_POSITION_INFORMATION fpi;
|
|
FILE_STANDARD_INFORMATION fsi;
|
|
|
|
/* Seeks on text files is tough, we rewind and read till we get to the
|
|
right place. */
|
|
|
|
if (whence != SEEK_CUR || offset != 0)
|
|
{
|
|
if (whence == SEEK_CUR)
|
|
offset -= ralen - raixget;
|
|
set_readahead_valid (0);
|
|
}
|
|
|
|
switch (whence)
|
|
{
|
|
case SEEK_SET:
|
|
fpi.CurrentByteOffset.QuadPart = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
status = NtQueryInformationFile (get_handle (), &io, &fpi, sizeof fpi,
|
|
FilePositionInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
fpi.CurrentByteOffset.QuadPart += offset;
|
|
break;
|
|
default: /* SEEK_END */
|
|
status = NtQueryInformationFile (get_handle (), &io, &fsi, sizeof fsi,
|
|
FileStandardInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
fpi.CurrentByteOffset.QuadPart = fsi.EndOfFile.QuadPart + offset;
|
|
break;
|
|
}
|
|
|
|
debug_printf ("setting file pointer to %U", fpi.CurrentByteOffset.QuadPart);
|
|
status = NtSetInformationFile (get_handle (), &io, &fpi, sizeof fpi,
|
|
FilePositionInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
_off64_t res = fpi.CurrentByteOffset.QuadPart;
|
|
|
|
/* When next we write(), we will check to see if *this* seek went beyond
|
|
the end of the file and if so, potentially sparsify the file. */
|
|
if (pc.support_sparse ())
|
|
did_lseek (true);
|
|
|
|
/* If this was a SEEK_CUR with offset 0, we still might have
|
|
readahead that we have to take into account when calculating
|
|
the actual position for the application. */
|
|
if (whence == SEEK_CUR)
|
|
res -= ralen - raixget;
|
|
|
|
return res;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_base::pread (void *, size_t, _off64_t)
|
|
{
|
|
set_errno (ESPIPE);
|
|
return -1;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_base::pwrite (void *, size_t, _off64_t)
|
|
{
|
|
set_errno (ESPIPE);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::close_with_arch ()
|
|
{
|
|
int res;
|
|
fhandler_base *fh;
|
|
if (usecount)
|
|
{
|
|
if (!--usecount)
|
|
debug_printf ("closing passed in archetype, usecount %d", usecount);
|
|
else
|
|
{
|
|
debug_printf ("not closing passed in archetype, usecount %d", usecount);
|
|
return 0;
|
|
}
|
|
fh = this;
|
|
}
|
|
else if (!archetype)
|
|
fh = this;
|
|
else
|
|
{
|
|
cleanup ();
|
|
if (archetype_usecount (-1) == 0)
|
|
{
|
|
debug_printf ("closing archetype");
|
|
fh = archetype;
|
|
}
|
|
else
|
|
{
|
|
debug_printf ("not closing archetype");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
res = fh->close ();
|
|
if (archetype)
|
|
{
|
|
cygheap->fdtab.delete_archetype (archetype);
|
|
archetype = NULL;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_base::close ()
|
|
{
|
|
int res = -1;
|
|
|
|
syscall_printf ("closing '%s' handle %p", get_name (), get_handle ());
|
|
if (nohandle () || CloseHandle (get_handle ()))
|
|
res = 0;
|
|
else
|
|
{
|
|
paranoid_printf ("CloseHandle failed, %E");
|
|
__seterrno ();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
DWORD WINAPI
|
|
flush_async_io (void *arg)
|
|
{
|
|
fhandler_base_overlapped *fh = (fhandler_base_overlapped *) arg;
|
|
debug_only_printf ("waiting for write I/O for %s", fh->get_name ());
|
|
DWORD nbytes;
|
|
bool res = GetOverlappedResult (fh->get_output_handle (),
|
|
fh->get_overlapped (), &nbytes, true);
|
|
debug_printf ("finished waiting for I/O from %s, res %d", fh->get_name (),
|
|
res);
|
|
fh->close ();
|
|
delete fh;
|
|
|
|
InterlockedDecrement (&fhandler_base_overlapped::asio_close_counter);
|
|
SetEvent (fhandler_base_overlapped::asio_done);
|
|
|
|
_my_tls._ctinfo->auto_release ();
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_base_overlapped::flush_all_async_io ()
|
|
{
|
|
while (asio_close_counter > 0)
|
|
if (WaitForSingleObject (asio_done, INFINITE) != WAIT_OBJECT_0)
|
|
{
|
|
system_printf ("WaitForSingleObject failed, possible data loss in pipe, %E");
|
|
break;
|
|
}
|
|
asio_close_counter = 0;
|
|
if (asio_done)
|
|
CloseHandle (asio_done);
|
|
}
|
|
|
|
/* Start a thread to handle closing of overlapped asynchronous I/O since
|
|
Windows amazingly does not seem to always flush I/O on close. */
|
|
void
|
|
fhandler_base_overlapped::check_later ()
|
|
{
|
|
set_close_on_exec (true);
|
|
char buf[MAX_PATH];
|
|
if (!asio_done
|
|
&& !(asio_done = CreateEvent (&sec_none_nih, false, false,
|
|
shared_name (buf, "asio",
|
|
GetCurrentProcessId ()))))
|
|
api_fatal ("CreateEvent failed, %E");
|
|
|
|
InterlockedIncrement (&asio_close_counter);
|
|
if (!new cygthread(flush_async_io, this, "flasio"))
|
|
api_fatal ("couldn't create a thread to track async I/O, %E");
|
|
debug_printf ("started thread to handle asynchronous closing for %s", get_name ());
|
|
}
|
|
|
|
int
|
|
fhandler_base_overlapped::close ()
|
|
{
|
|
int res;
|
|
int writer = (get_access () & GENERIC_WRITE);
|
|
/* Need to treat non-blocking I/O specially because Windows appears to
|
|
be brain-dead */
|
|
if (writer && is_nonblocking () && has_ongoing_io ())
|
|
{
|
|
clone (HEAP_3_FHANDLER)->check_later ();
|
|
res = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Cancelling seems to be necessary for cases where a reader is
|
|
still executing when a signal handler performs a close. */
|
|
if (!writer)
|
|
CancelIo (get_io_handle ());
|
|
destroy_overlapped ();
|
|
res = fhandler_base::close ();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_base::ioctl (unsigned int cmd, void *buf)
|
|
{
|
|
int res;
|
|
|
|
switch (cmd)
|
|
{
|
|
case FIONBIO:
|
|
set_nonblocking (*(int *) buf);
|
|
res = 0;
|
|
break;
|
|
case FIONREAD:
|
|
case TIOCSCTTY:
|
|
set_errno (ENOTTY);
|
|
res = -1;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
res = -1;
|
|
break;
|
|
}
|
|
|
|
syscall_printf ("%d = ioctl(%x, %p)", res, cmd, buf);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_base::lock (int, struct __flock64 *)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_base::fstat (struct __stat64 *buf)
|
|
{
|
|
if (is_fs_special ())
|
|
return fstat_fs (buf);
|
|
|
|
switch (get_device ())
|
|
{
|
|
case FH_PIPE:
|
|
buf->st_mode = S_IFIFO | S_IRUSR | S_IWUSR;
|
|
break;
|
|
case FH_PIPEW:
|
|
buf->st_mode = S_IFIFO | S_IWUSR;
|
|
break;
|
|
case FH_PIPER:
|
|
buf->st_mode = S_IFIFO | S_IRUSR;
|
|
break;
|
|
case FH_FULL:
|
|
buf->st_mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
|
|
break;
|
|
default:
|
|
buf->st_mode = S_IFCHR | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
|
|
break;
|
|
}
|
|
|
|
buf->st_uid = geteuid32 ();
|
|
buf->st_gid = getegid32 ();
|
|
buf->st_nlink = 1;
|
|
buf->st_blksize = PREFERRED_IO_BLKSIZE;
|
|
|
|
buf->st_ctim.tv_sec = 1164931200L; /* Arbitrary value: 2006-12-01 */
|
|
buf->st_ctim.tv_nsec = 0L;
|
|
buf->st_birthtim = buf->st_ctim;
|
|
buf->st_mtim.tv_sec = time (NULL); /* Arbitrary value: current time,
|
|
like Linux */
|
|
buf->st_mtim.tv_nsec = 0L;
|
|
buf->st_atim = buf->st_mtim;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_base::fstatvfs (struct statvfs *sfs)
|
|
{
|
|
/* If we hit this base implementation, it's some device in /dev.
|
|
Just call statvfs on /dev for simplicity. */
|
|
path_conv pc ("/dev", PC_KEEP_HANDLE);
|
|
fhandler_disk_file fh (pc);
|
|
return fh.fstatvfs (sfs);
|
|
}
|
|
|
|
int
|
|
fhandler_base::init (HANDLE f, DWORD a, mode_t bin)
|
|
{
|
|
set_io_handle (f);
|
|
access = a;
|
|
a &= GENERIC_READ | GENERIC_WRITE;
|
|
int flags = 0;
|
|
if (a == GENERIC_READ)
|
|
flags = O_RDONLY;
|
|
else if (a == GENERIC_WRITE)
|
|
flags = O_WRONLY;
|
|
else if (a == (GENERIC_READ | GENERIC_WRITE))
|
|
flags = O_RDWR;
|
|
set_flags (flags | bin);
|
|
set_open_status ();
|
|
debug_printf ("created new fhandler_base for handle %p, bin %d", f, rbinary ());
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::dup (fhandler_base *child, int)
|
|
{
|
|
debug_printf ("in fhandler_base dup");
|
|
|
|
HANDLE nh;
|
|
if (!nohandle () && !archetype)
|
|
{
|
|
if (!DuplicateHandle (GetCurrentProcess (), get_handle (),
|
|
GetCurrentProcess (), &nh,
|
|
0, TRUE, DUPLICATE_SAME_ACCESS))
|
|
{
|
|
debug_printf ("dup(%s) failed, handle %x, %E",
|
|
get_name (), get_handle ());
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
|
|
VerifyHandle (nh);
|
|
child->set_io_handle (nh);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_base_overlapped::dup (fhandler_base *child, int flags)
|
|
{
|
|
int res = fhandler_base::dup (child, flags) ||
|
|
((fhandler_base_overlapped *) child)->setup_overlapped ();
|
|
return res;
|
|
}
|
|
|
|
int fhandler_base::fcntl (int cmd, void *arg)
|
|
{
|
|
int res;
|
|
|
|
switch (cmd)
|
|
{
|
|
case F_GETFD:
|
|
res = close_on_exec () ? FD_CLOEXEC : 0;
|
|
break;
|
|
case F_SETFD:
|
|
set_close_on_exec (((int) arg & FD_CLOEXEC) ? 1 : 0);
|
|
res = 0;
|
|
break;
|
|
case F_GETFL:
|
|
res = get_flags ();
|
|
debug_printf ("GETFL: %p", res);
|
|
break;
|
|
case F_SETFL:
|
|
{
|
|
/* Only O_APPEND, O_ASYNC and O_NONBLOCK/O_NDELAY are allowed.
|
|
Each other flag will be ignored.
|
|
Since O_ASYNC isn't defined in fcntl.h it's currently
|
|
ignored as well. */
|
|
const int allowed_flags = O_APPEND | O_NONBLOCK_MASK;
|
|
int new_flags = (int) arg & allowed_flags;
|
|
/* Carefully test for the O_NONBLOCK or deprecated OLD_O_NDELAY flag.
|
|
Set only the flag that has been passed in. If both are set, just
|
|
record O_NONBLOCK. */
|
|
if ((new_flags & OLD_O_NDELAY) && (new_flags & O_NONBLOCK))
|
|
new_flags &= ~OLD_O_NDELAY;
|
|
set_flags ((get_flags () & ~allowed_flags) | new_flags);
|
|
}
|
|
res = 0;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
res = -1;
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* Base terminal handlers. These just return errors. */
|
|
|
|
int
|
|
fhandler_base::tcflush (int)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcsendbreak (int)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcdrain ()
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcflow (int)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcsetattr (int, const struct termios *)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcgetattr (struct termios *)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcsetpgrp (const pid_t)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::tcgetpgrp ()
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
pid_t
|
|
fhandler_base::tcgetsid ()
|
|
{
|
|
set_errno (ENOTTY);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::ptsname_r (char *, size_t)
|
|
{
|
|
set_errno (ENOTTY);
|
|
return ENOTTY;
|
|
}
|
|
|
|
/* Normal I/O constructor */
|
|
fhandler_base::fhandler_base () :
|
|
status (),
|
|
open_status (),
|
|
access (0),
|
|
io_handle (NULL),
|
|
ino (0),
|
|
_refcnt (0),
|
|
openflags (0),
|
|
rabuf (NULL),
|
|
ralen (0),
|
|
raixget (0),
|
|
raixput (0),
|
|
rabuflen (0),
|
|
unique_id (0),
|
|
archetype (NULL),
|
|
usecount (0)
|
|
{
|
|
isclosed (false);
|
|
}
|
|
|
|
/* Normal I/O destructor */
|
|
fhandler_base::~fhandler_base ()
|
|
{
|
|
if (rabuf)
|
|
free (rabuf);
|
|
}
|
|
|
|
/**********************************************************************/
|
|
/* /dev/null */
|
|
|
|
fhandler_dev_null::fhandler_dev_null () :
|
|
fhandler_base ()
|
|
{
|
|
}
|
|
|
|
void
|
|
fhandler_base::set_no_inheritance (HANDLE &h, bool not_inheriting)
|
|
{
|
|
if (!SetHandleInformation (h, HANDLE_FLAG_INHERIT,
|
|
not_inheriting ? 0 : HANDLE_FLAG_INHERIT))
|
|
debug_printf ("SetHandleInformation failed, %E");
|
|
#ifdef DEBUGGING_AND_FDS_PROTECTED
|
|
if (h)
|
|
setclexec (oh, h, not_inheriting);
|
|
#endif
|
|
}
|
|
|
|
bool
|
|
fhandler_base::fork_fixup (HANDLE parent, HANDLE &h, const char *name)
|
|
{
|
|
HANDLE oh = h;
|
|
bool res = false;
|
|
if (/* !is_socket () && */ !close_on_exec ())
|
|
debug_printf ("handle %p already opened", h);
|
|
else if (!DuplicateHandle (parent, h, GetCurrentProcess (), &h,
|
|
0, !close_on_exec (), DUPLICATE_SAME_ACCESS))
|
|
system_printf ("%s - %E, handle %s<%p>", get_name (), name, h);
|
|
else
|
|
{
|
|
if (oh != h)
|
|
VerifyHandle (h);
|
|
res = true;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
void
|
|
fhandler_base::set_close_on_exec (bool val)
|
|
{
|
|
if (!nohandle ())
|
|
set_no_inheritance (io_handle, val);
|
|
close_on_exec (val);
|
|
debug_printf ("set close_on_exec for %s to %d", get_name (), val);
|
|
}
|
|
|
|
void
|
|
fhandler_base::fixup_after_fork (HANDLE parent)
|
|
{
|
|
debug_printf ("inheriting '%s' from parent", get_name ());
|
|
if (!nohandle ())
|
|
fork_fixup (parent, io_handle, "io_handle");
|
|
/* POSIX locks are not inherited across fork. */
|
|
if (unique_id)
|
|
del_my_locks (after_fork);
|
|
}
|
|
|
|
void
|
|
fhandler_base_overlapped::fixup_after_fork (HANDLE parent)
|
|
{
|
|
setup_overlapped ();
|
|
fhandler_base::fixup_after_fork (parent);
|
|
}
|
|
|
|
void
|
|
fhandler_base::fixup_after_exec ()
|
|
{
|
|
debug_printf ("here for '%s'", get_name ());
|
|
if (unique_id && close_on_exec ())
|
|
del_my_locks (after_exec);
|
|
}
|
|
void
|
|
fhandler_base_overlapped::fixup_after_exec ()
|
|
{
|
|
setup_overlapped ();
|
|
fhandler_base::fixup_after_exec ();
|
|
}
|
|
|
|
bool
|
|
fhandler_base::is_nonblocking ()
|
|
{
|
|
return (openflags & O_NONBLOCK_MASK) != 0;
|
|
}
|
|
|
|
void
|
|
fhandler_base::set_nonblocking (int yes)
|
|
{
|
|
int current = openflags & O_NONBLOCK_MASK;
|
|
int new_flags = yes ? (!current ? O_NONBLOCK : current) : 0;
|
|
openflags = (openflags & ~O_NONBLOCK_MASK) | new_flags;
|
|
}
|
|
|
|
int
|
|
fhandler_base::mkdir (mode_t)
|
|
{
|
|
if (exists ())
|
|
set_errno (EEXIST);
|
|
else
|
|
set_errno (EROFS);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::rmdir ()
|
|
{
|
|
if (!exists ())
|
|
set_errno (ENOENT);
|
|
else if (!pc.isdir ())
|
|
set_errno (ENOTDIR);
|
|
else
|
|
set_errno (EROFS);
|
|
return -1;
|
|
}
|
|
|
|
DIR *
|
|
fhandler_base::opendir (int fd)
|
|
{
|
|
set_errno (ENOTDIR);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
fhandler_base::readdir (DIR *, dirent *)
|
|
{
|
|
return ENOTDIR;
|
|
}
|
|
|
|
long
|
|
fhandler_base::telldir (DIR *)
|
|
{
|
|
set_errno (ENOTDIR);
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
fhandler_base::seekdir (DIR *, long)
|
|
{
|
|
set_errno (ENOTDIR);
|
|
}
|
|
|
|
void
|
|
fhandler_base::rewinddir (DIR *)
|
|
{
|
|
set_errno (ENOTDIR);
|
|
}
|
|
|
|
int
|
|
fhandler_base::closedir (DIR *)
|
|
{
|
|
set_errno (ENOTDIR);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fchmod (mode_t mode)
|
|
{
|
|
extern int chmod_device (path_conv& pc, mode_t mode);
|
|
if (pc.is_fs_special ())
|
|
return chmod_device (pc, mode);
|
|
/* By default, just succeeds. */
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fchown (__uid32_t uid, __gid32_t gid)
|
|
{
|
|
if (pc.is_fs_special ())
|
|
return ((fhandler_disk_file *) this)->fhandler_disk_file::fchown (uid, gid);
|
|
/* By default, just succeeds. */
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_base::facl (int cmd, int nentries, __aclent32_t *aclbufp)
|
|
{
|
|
int res = -1;
|
|
switch (cmd)
|
|
{
|
|
case SETACL:
|
|
/* By default, just succeeds. */
|
|
res = 0;
|
|
break;
|
|
case GETACL:
|
|
if (!aclbufp)
|
|
set_errno(EFAULT);
|
|
else if (nentries < MIN_ACL_ENTRIES)
|
|
set_errno (ENOSPC);
|
|
else
|
|
{
|
|
aclbufp[0].a_type = USER_OBJ;
|
|
aclbufp[0].a_id = myself->uid;
|
|
aclbufp[0].a_perm = (S_IRUSR | S_IWUSR) >> 6;
|
|
aclbufp[1].a_type = GROUP_OBJ;
|
|
aclbufp[1].a_id = myself->gid;
|
|
aclbufp[1].a_perm = (S_IRGRP | S_IWGRP) >> 3;
|
|
aclbufp[2].a_type = OTHER_OBJ;
|
|
aclbufp[2].a_id = ILLEGAL_GID;
|
|
aclbufp[2].a_perm = S_IROTH | S_IWOTH;
|
|
aclbufp[3].a_type = CLASS_OBJ;
|
|
aclbufp[3].a_id = ILLEGAL_GID;
|
|
aclbufp[3].a_perm = S_IRWXU | S_IRWXG | S_IRWXO;
|
|
res = MIN_ACL_ENTRIES;
|
|
}
|
|
break;
|
|
case GETACLCNT:
|
|
res = MIN_ACL_ENTRIES;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
ssize_t
|
|
fhandler_base::fgetxattr (const char *name, void *value, size_t size)
|
|
{
|
|
set_errno (ENOTSUP);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fsetxattr (const char *name, const void *value, size_t size,
|
|
int flags)
|
|
{
|
|
set_errno (ENOTSUP);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fadvise (_off64_t offset, _off64_t length, int advice)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::ftruncate (_off64_t length, bool allow_truncate)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::link (const char *newpath)
|
|
{
|
|
set_errno (EPERM);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::utimens (const struct timespec *tvp)
|
|
{
|
|
if (is_fs_special ())
|
|
return utimens_fs (tvp);
|
|
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fsync ()
|
|
{
|
|
if (!get_handle () || nohandle ())
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
if (pc.isdir ()) /* Just succeed. */
|
|
return 0;
|
|
if (FlushFileBuffers (get_handle ()))
|
|
return 0;
|
|
|
|
/* Ignore ERROR_INVALID_FUNCTION because FlushFileBuffers() always fails
|
|
with this code on raw devices which are unbuffered by default. */
|
|
DWORD errcode = GetLastError();
|
|
if (errcode == ERROR_INVALID_FUNCTION)
|
|
return 0;
|
|
|
|
__seterrno_from_win_error (errcode);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_base::fpathconf (int v)
|
|
{
|
|
int ret;
|
|
|
|
switch (v)
|
|
{
|
|
case _PC_LINK_MAX:
|
|
return pc.fs_is_ntfs () || pc.fs_is_samba () || pc.fs_is_nfs ()
|
|
? LINK_MAX : 1;
|
|
case _PC_MAX_CANON:
|
|
if (is_tty ())
|
|
return MAX_CANON;
|
|
set_errno (EINVAL);
|
|
break;
|
|
case _PC_MAX_INPUT:
|
|
if (is_tty ())
|
|
return MAX_INPUT;
|
|
set_errno (EINVAL);
|
|
break;
|
|
case _PC_NAME_MAX:
|
|
/* NAME_MAX is without trailing \0 */
|
|
if (!pc.isdir ())
|
|
return NAME_MAX;
|
|
ret = NT_MAX_PATH - strlen (get_name ()) - 2;
|
|
return ret < 0 ? 0 : ret > NAME_MAX ? NAME_MAX : ret;
|
|
case _PC_PATH_MAX:
|
|
/* PATH_MAX is with trailing \0 */
|
|
if (!pc.isdir ())
|
|
return PATH_MAX;
|
|
ret = NT_MAX_PATH - strlen (get_name ()) - 1;
|
|
return ret < 0 ? 0 : ret > PATH_MAX ? PATH_MAX : ret;
|
|
case _PC_PIPE_BUF:
|
|
if (pc.isdir ()
|
|
|| get_device () == FH_FIFO || get_device () == FH_PIPE
|
|
|| get_device () == FH_PIPER || get_device () == FH_PIPEW)
|
|
return PIPE_BUF;
|
|
set_errno (EINVAL);
|
|
break;
|
|
case _PC_CHOWN_RESTRICTED:
|
|
return 1;
|
|
case _PC_NO_TRUNC:
|
|
return 1;
|
|
case _PC_VDISABLE:
|
|
if (is_tty ())
|
|
return _POSIX_VDISABLE;
|
|
set_errno (EINVAL);
|
|
break;
|
|
case _PC_ASYNC_IO:
|
|
case _PC_PRIO_IO:
|
|
break;
|
|
case _PC_SYNC_IO:
|
|
return 1;
|
|
case _PC_FILESIZEBITS:
|
|
return FILESIZEBITS;
|
|
case _PC_2_SYMLINKS:
|
|
return 1;
|
|
case _PC_SYMLINK_MAX:
|
|
return SYMLINK_MAX;
|
|
case _PC_POSIX_PERMISSIONS:
|
|
case _PC_POSIX_SECURITY:
|
|
if (get_device () == FH_FS)
|
|
return pc.has_acls () || pc.fs_is_nfs ();
|
|
set_errno (EINVAL);
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
break;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Overlapped I/O */
|
|
|
|
int __stdcall __attribute__ ((regparm (1)))
|
|
fhandler_base_overlapped::setup_overlapped ()
|
|
{
|
|
OVERLAPPED *ov = get_overlapped_buffer ();
|
|
memset (ov, 0, sizeof (*ov));
|
|
set_overlapped (ov);
|
|
ov->hEvent = CreateEvent (&sec_none_nih, true, true, NULL);
|
|
io_pending = false;
|
|
return ov->hEvent ? 0 : -1;
|
|
}
|
|
|
|
void __stdcall __attribute__ ((regparm (1)))
|
|
fhandler_base_overlapped::destroy_overlapped ()
|
|
{
|
|
OVERLAPPED *ov = get_overlapped ();
|
|
if (ov && ov->hEvent)
|
|
{
|
|
SetEvent (ov->hEvent);
|
|
CloseHandle (ov->hEvent);
|
|
ov->hEvent = NULL;
|
|
}
|
|
io_pending = false;
|
|
get_overlapped () = NULL;
|
|
}
|
|
|
|
bool __stdcall __attribute__ ((regparm (1)))
|
|
fhandler_base_overlapped::has_ongoing_io ()
|
|
{
|
|
if (!io_pending)
|
|
return false;
|
|
|
|
if (!IsEventSignalled (get_overlapped ()->hEvent))
|
|
return true;
|
|
io_pending = false;
|
|
DWORD nbytes;
|
|
GetOverlappedResult (get_output_handle (), get_overlapped (), &nbytes, false);
|
|
return false;
|
|
}
|
|
|
|
fhandler_base_overlapped::wait_return __stdcall __attribute__ ((regparm (3)))
|
|
fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *bytes, bool nonblocking, DWORD len)
|
|
{
|
|
if (!get_overlapped ())
|
|
return inres ? overlapped_success : overlapped_error;
|
|
|
|
wait_return res = overlapped_unknown;
|
|
DWORD err;
|
|
if (inres)
|
|
/* handle below */;
|
|
else if ((err = GetLastError ()) != ERROR_IO_PENDING)
|
|
res = overlapped_error;
|
|
else if (!nonblocking)
|
|
/* handle below */;
|
|
else if (!writing)
|
|
SetEvent (get_overlapped ()->hEvent); /* Force immediate WFMO return */
|
|
else
|
|
{
|
|
*bytes = len; /* Assume that this worked */
|
|
io_pending = true; /* but don't allow subsequent */
|
|
res = overlapped_success; /* writes until completed */
|
|
}
|
|
if (res == overlapped_unknown)
|
|
{
|
|
DWORD wfres = cygwait (get_overlapped ()->hEvent);
|
|
HANDLE h = writing ? get_output_handle () : get_handle ();
|
|
BOOL wores;
|
|
if (isclosed ())
|
|
{
|
|
switch (wfres)
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
err = ERROR_INVALID_HANDLE;
|
|
break;
|
|
case WAIT_SIGNALED:
|
|
err = ERROR_INVALID_AT_INTERRUPT_TIME;
|
|
break;
|
|
default:
|
|
err = GetLastError ();
|
|
break;
|
|
}
|
|
res = overlapped_error;
|
|
}
|
|
else
|
|
{
|
|
/* Cancelling here to prevent races. It's possible that the I/O has
|
|
completed already, in which case this is a no-op. Otherwise,
|
|
WFMO returned because 1) This is a non-blocking call, 2) a signal
|
|
arrived, or 3) the operation was cancelled. These cases may be
|
|
overridden by the return of GetOverlappedResult which could detect
|
|
that I/O completion occurred. */
|
|
CancelIo (h);
|
|
wores = GetOverlappedResult (h, get_overlapped (), bytes, false);
|
|
err = GetLastError ();
|
|
ResetEvent (get_overlapped ()->hEvent); /* Probably not needed but CYA */
|
|
debug_printf ("wfres %d, wores %d, bytes %u", wfres, wores, *bytes);
|
|
if (wores)
|
|
res = overlapped_success; /* operation succeeded */
|
|
else if (wfres == WAIT_OBJECT_0 + 1)
|
|
{
|
|
err = ERROR_INVALID_AT_INTERRUPT_TIME; /* forces an EINTR below */
|
|
debug_printf ("signal");
|
|
res = overlapped_error;
|
|
}
|
|
else if (wfres == WAIT_OBJECT_0 + 2)
|
|
pthread::static_cancel_self (); /* never returns */
|
|
else if (nonblocking)
|
|
res = overlapped_nonblocking_no_data; /* more handling below */
|
|
else
|
|
{
|
|
debug_printf ("GetOverLappedResult failed, h %p, bytes %u, %E", h, *bytes);
|
|
res = overlapped_error;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (res == overlapped_success)
|
|
{
|
|
debug_printf ("normal %s, %u bytes ispipe() %d", writing ? "write" : "read", *bytes, ispipe ());
|
|
if (*bytes == 0 && !writing && ispipe ())
|
|
res = overlapped_nullread;
|
|
}
|
|
else if (res == overlapped_nonblocking_no_data)
|
|
{
|
|
*bytes = (DWORD) -1;
|
|
set_errno (EAGAIN);
|
|
debug_printf ("no data to read for nonblocking I/O");
|
|
}
|
|
else if (err == ERROR_HANDLE_EOF || err == ERROR_BROKEN_PIPE)
|
|
{
|
|
debug_printf ("EOF, %E");
|
|
*bytes = 0;
|
|
res = overlapped_success;
|
|
if (writing && err == ERROR_BROKEN_PIPE)
|
|
raise (SIGPIPE);
|
|
}
|
|
else
|
|
{
|
|
debug_printf ("res %u, Win32 Error %u", (unsigned) res, err);
|
|
*bytes = (DWORD) -1;
|
|
__seterrno_from_win_error (err);
|
|
if (writing && err == ERROR_NO_DATA)
|
|
raise (SIGPIPE);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void __stdcall __attribute__ ((regparm (3)))
|
|
fhandler_base_overlapped::raw_read (void *ptr, size_t& len)
|
|
{
|
|
DWORD nbytes;
|
|
bool keep_looping;
|
|
do
|
|
{
|
|
bool res = ReadFile (get_handle (), ptr, len, &nbytes,
|
|
get_overlapped ());
|
|
switch (wait_overlapped (res, false, &nbytes, is_nonblocking ()))
|
|
{
|
|
case overlapped_nullread:
|
|
keep_looping = true;
|
|
break;
|
|
default: /* Added to quiet gcc */
|
|
case overlapped_success:
|
|
case overlapped_error:
|
|
keep_looping = false;
|
|
break;
|
|
}
|
|
}
|
|
while (keep_looping);
|
|
len = (size_t) nbytes;
|
|
}
|
|
|
|
ssize_t __stdcall __attribute__ ((regparm (3)))
|
|
fhandler_base_overlapped::raw_write (const void *ptr, size_t len)
|
|
{
|
|
size_t nbytes;
|
|
if (has_ongoing_io ())
|
|
{
|
|
set_errno (EAGAIN);
|
|
nbytes = (DWORD) -1;
|
|
}
|
|
else
|
|
{
|
|
size_t chunk;
|
|
if (!max_atomic_write || len < max_atomic_write)
|
|
chunk = len;
|
|
else if (is_nonblocking ())
|
|
chunk = len = max_atomic_write;
|
|
else
|
|
chunk = max_atomic_write;
|
|
|
|
nbytes = 0;
|
|
DWORD nbytes_now = 0;
|
|
/* Write to fd in smaller chunks, accumlating a total.
|
|
If there's an error, just return the accumulated total
|
|
unless the first write fails, in which case return value
|
|
from wait_overlapped(). */
|
|
while (nbytes < len)
|
|
{
|
|
size_t left = len - nbytes;
|
|
size_t len1;
|
|
if (left > chunk)
|
|
len1 = chunk;
|
|
else
|
|
len1 = left;
|
|
bool res = WriteFile (get_output_handle (), ptr, len1, &nbytes_now,
|
|
get_overlapped ());
|
|
switch (wait_overlapped (res, true, &nbytes_now,
|
|
is_nonblocking (), len1))
|
|
{
|
|
case overlapped_success:
|
|
ptr = ((char *) ptr) + chunk;
|
|
nbytes += nbytes_now;
|
|
/* fall through intentionally */
|
|
case overlapped_error:
|
|
len = 0; /* terminate loop */
|
|
case overlapped_unknown:
|
|
case overlapped_nullread:
|
|
case overlapped_nonblocking_no_data:
|
|
break;
|
|
}
|
|
}
|
|
if (!nbytes)
|
|
nbytes = nbytes_now;
|
|
}
|
|
return nbytes;
|
|
}
|