* fhandler.h (class fhandler_base): Declare new method link.
(class fhandler_socket): Ditto. (class fhandler_disk_file): Ditto. * fhandler.cc (fhandler_base::open): Add FILE_WRITE_ATTRIBUTES to query_write_control access flags. (fhandler_base::link): New method. * fhandler_disk_file.cc (fhandler_disk_file::fchmod): Don't try to open with O_WRONLY since query_write_control includes FILE_WRITE_ATTRIBUTES. (fhandler_disk_file::fchown): Ditto. (fhandler_disk_file::facl): Ditto. (fhandler_disk_file::link): New method. Touch st_ctime on successful link. * fhandler_socket.cc (fhandler_socket::link): New method. * syscalls.cc (link): Move functionality into fhandler method link. Just call this method from here.
This commit is contained in:
Corinna Vinschen
@@ -668,188 +668,25 @@ isatty (int fd)
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*/
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extern "C" int
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link (const char *a, const char *b)
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link (const char *oldpath, const char *newpath)
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{
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int res = -1;
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path_conv real_a (a, PC_SYM_NOFOLLOW | PC_FULL);
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path_conv real_b (b, PC_SYM_NOFOLLOW | PC_FULL);
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extern bool allow_winsymlinks;
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fhandler_base *fh;
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if (real_a.error)
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if (!(fh = build_fh_name (oldpath, NULL, PC_SYM_NOFOLLOW)))
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goto error;
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if (fh->error ())
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{
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set_errno (real_a.error);
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goto done;
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debug_printf ("got %d error from build_fh_name", fh->error ());
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set_errno (fh->error ());
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}
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if (real_b.error)
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{
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set_errno (real_b.case_clash ? ECASECLASH : real_b.error);
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goto done;
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}
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if (real_b.exists ())
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{
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syscall_printf ("file '%s' exists?", (char *) real_b);
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set_errno (EEXIST);
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goto done;
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}
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if (real_b[strlen (real_b) - 1] == '.')
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{
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syscall_printf ("trailing dot, bailing out");
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set_errno (EINVAL);
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goto done;
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}
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/* Shortcut hack. */
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char new_lnk_buf[CYG_MAX_PATH + 5];
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if (allow_winsymlinks && real_a.is_lnk_symlink () && !real_b.case_clash)
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{
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strcpy (new_lnk_buf, b);
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strcat (new_lnk_buf, ".lnk");
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b = new_lnk_buf;
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real_b.check (b, PC_SYM_NOFOLLOW | PC_FULL);
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}
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/* Try to make hard link first on Windows NT */
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if (wincap.has_hard_links ())
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{
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if (CreateHardLinkA (real_b, real_a, NULL))
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goto success;
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/* There are two cases to consider:
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- The FS doesn't support hard links ==> ERROR_INVALID_FUNCTION
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We copy the file.
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- CreateHardLinkA is not supported ==> ERROR_PROC_NOT_FOUND
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In that case (<= NT4) we try the old-style method.
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Any other error should be taken seriously. */
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if (GetLastError () == ERROR_INVALID_FUNCTION)
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{
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syscall_printf ("FS doesn't support hard links: Copy file");
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goto docopy;
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}
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if (GetLastError () != ERROR_PROC_NOT_FOUND)
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{
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syscall_printf ("CreateHardLinkA failed");
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__seterrno ();
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goto done;
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}
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HANDLE hFileSource;
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WIN32_STREAM_ID StreamId;
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DWORD dwBytesWritten;
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LPVOID lpContext;
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DWORD cbPathLen;
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DWORD StreamSize;
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WCHAR wbuf[CYG_MAX_PATH];
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BOOL bSuccess;
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DWORD write_err;
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hFileSource = CreateFile (real_a, FILE_WRITE_ATTRIBUTES,
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FILE_SHARE_READ | FILE_SHARE_WRITE /*| FILE_SHARE_DELETE*/,
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&sec_none_nih, // sa
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OPEN_EXISTING, 0, NULL);
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if (hFileSource == INVALID_HANDLE_VALUE)
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{
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syscall_printf ("cannot open source, %E");
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goto docopy;
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}
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cbPathLen = sys_mbstowcs (wbuf, real_b, CYG_MAX_PATH) * sizeof (WCHAR);
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StreamId.dwStreamId = BACKUP_LINK;
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StreamId.dwStreamAttributes = 0;
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StreamId.dwStreamNameSize = 0;
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StreamId.Size.HighPart = 0;
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StreamId.Size.LowPart = cbPathLen;
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StreamSize = sizeof (WIN32_STREAM_ID) - sizeof (WCHAR**) +
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StreamId.dwStreamNameSize;
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lpContext = NULL;
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write_err = 0;
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/* Write the WIN32_STREAM_ID */
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bSuccess = BackupWrite (
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hFileSource,
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(LPBYTE) &StreamId, // buffer to write
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StreamSize, // number of bytes to write
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&dwBytesWritten,
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FALSE, // don't abort yet
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FALSE, // don't process security
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&lpContext);
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if (bSuccess)
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{
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/* write the buffer containing the path */
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/* FIXME: BackupWrite sometimes traps if linkname is invalid.
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Need to handle. */
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bSuccess = BackupWrite (
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hFileSource,
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(LPBYTE) wbuf, // buffer to write
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cbPathLen, // number of bytes to write
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&dwBytesWritten,
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FALSE, // don't abort yet
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FALSE, // don't process security
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&lpContext
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);
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if (!bSuccess)
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{
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write_err = GetLastError ();
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syscall_printf ("cannot write linkname, %E");
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}
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/* Free context */
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BackupWrite (
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hFileSource,
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NULL, // buffer to write
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0, // number of bytes to write
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&dwBytesWritten,
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TRUE, // abort
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FALSE, // don't process security
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&lpContext);
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}
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else
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{
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write_err = GetLastError ();
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syscall_printf ("cannot write streamId, %E");
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}
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CloseHandle (hFileSource);
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if (!bSuccess)
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{
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/* Only copy file if FS doesn't support hard links */
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if (write_err == ERROR_INVALID_FUNCTION)
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{
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syscall_printf ("FS doesn't support hard links: Copy file");
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goto docopy;
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}
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__seterrno_from_win_error (write_err);
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goto done;
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}
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success:
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res = 0;
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if (!allow_winsymlinks && real_a.is_lnk_symlink ())
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SetFileAttributes (real_b, (DWORD) real_a
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| FILE_ATTRIBUTE_SYSTEM
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| FILE_ATTRIBUTE_READONLY);
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goto done;
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}
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docopy:
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/* do this with a copy */
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if (CopyFileA (real_a, real_b, 1))
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res = 0;
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else
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__seterrno ();
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res = fh->link (newpath);
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done:
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syscall_printf ("%d = link (%s, %s)", res, a, b);
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delete fh;
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error:
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syscall_printf ("%d = link (%s, %s)", res, oldpath, newpath);
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return res;
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}
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