| 1 | /* Emulate fsync on platforms that lack it, primarily Windows and |
| 2 | cross-compilers like MinGW. |
| 3 | |
| 4 | This is derived from sqlite3 sources. |
| 5 | http://www.sqlite.org/cvstrac/rlog?f=sqlite/src/os_win.c |
| 6 | http://www.sqlite.org/copyright.html |
| 7 | |
| 8 | Written by Richard W.M. Jones <rjones.at.redhat.com> |
| 9 | |
| 10 | Copyright (C) 2008-2014 Free Software Foundation, Inc. |
| 11 | |
| 12 | This library is free software; you can redistribute it and/or |
| 13 | modify it under the terms of the GNU Lesser General Public |
| 14 | License as published by the Free Software Foundation; either |
| 15 | version 2.1 of the License, or (at your option) any later version. |
| 16 | |
| 17 | This library is distributed in the hope that it will be useful, |
| 18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | Lesser General Public License for more details. |
| 21 | |
| 22 | You should have received a copy of the GNU Lesser General Public License |
| 23 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 24 | |
| 25 | #include <config.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
| 29 | |
| 30 | /* FlushFileBuffers */ |
| 31 | # define WIN32_LEAN_AND_MEAN |
| 32 | # include <windows.h> |
| 33 | |
| 34 | # include <errno.h> |
| 35 | |
| 36 | /* Get _get_osfhandle. */ |
| 37 | # include "msvc-nothrow.h" |
| 38 | |
| 39 | int |
| 40 | fsync (int fd) |
| 41 | { |
| 42 | HANDLE h = (HANDLE) _get_osfhandle (fd); |
| 43 | DWORD err; |
| 44 | |
| 45 | if (h == INVALID_HANDLE_VALUE) |
| 46 | { |
| 47 | errno = EBADF; |
| 48 | return -1; |
| 49 | } |
| 50 | |
| 51 | if (!FlushFileBuffers (h)) |
| 52 | { |
| 53 | /* Translate some Windows errors into rough approximations of Unix |
| 54 | * errors. MSDN is useless as usual - in this case it doesn't |
| 55 | * document the full range of errors. |
| 56 | */ |
| 57 | err = GetLastError (); |
| 58 | switch (err) |
| 59 | { |
| 60 | case ERROR_ACCESS_DENIED: |
| 61 | /* For a read-only handle, fsync should succeed, even though we have |
| 62 | no way to sync the access-time changes. */ |
| 63 | return 0; |
| 64 | |
| 65 | /* eg. Trying to fsync a tty. */ |
| 66 | case ERROR_INVALID_HANDLE: |
| 67 | errno = EINVAL; |
| 68 | break; |
| 69 | |
| 70 | default: |
| 71 | errno = EIO; |
| 72 | } |
| 73 | return -1; |
| 74 | } |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | #else /* !Windows */ |
| 80 | |
| 81 | # error "This platform lacks fsync function, and Gnulib doesn't provide a replacement. This is a bug in Gnulib." |
| 82 | |
| 83 | #endif /* !Windows */ |