/* fhandler_disk_file.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include #include #include #include #include #include "cygerrno.h" #include "perprocess.h" #include "security.h" #include "cygwin/version.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "shared_info.h" #include "pinfo.h" #include #include "ntdll.h" #include #include #include #define _COMPILING_NEWLIB #include unsigned __stdcall path_conv::ndisk_links (DWORD nNumberOfLinks) { if (!isdir () || isremote ()) return nNumberOfLinks; int len = strlen (*this); char fn[len + 3]; strcpy (fn, *this); const char *s; unsigned count; if (nNumberOfLinks <= 1) { s = "/*"; count = 0; } else { s = "/.."; count = nNumberOfLinks; } if (len == 0 || isdirsep (fn[len - 1])) strcpy (fn + len, s + 1); else strcpy (fn + len, s); WIN32_FIND_DATA buf; HANDLE h = FindFirstFile (fn, &buf); int saw_dot = 2; if (h != INVALID_HANDLE_VALUE) { if (nNumberOfLinks > 1) saw_dot--; else do { if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) count++; if (buf.cFileName[0] == '.' && (buf.cFileName[1] == '\0' || (buf.cFileName[1] == '.' && buf.cFileName[2] == '\0'))) saw_dot--; } while (FindNextFileA (h, &buf)); FindClose (h); } if (nNumberOfLinks > 1) { fn[len + 2] = '\0'; h = FindFirstFile (fn, &buf); if (h) saw_dot--; FindClose (h); } return count + saw_dot; } int __stdcall fhandler_base::fstat_by_handle (struct __stat64 *buf) { BY_HANDLE_FILE_INFORMATION local; if (wincap.is_winnt ()) { NTSTATUS status; IO_STATUS_BLOCK io; /* The entries potentially contain a name of MAX_PATH wide characters. */ DWORD fvi_size = 2 * CYG_MAX_PATH + sizeof (FILE_FS_VOLUME_INFORMATION); DWORD fai_size = 2 * CYG_MAX_PATH + sizeof (FILE_ALL_INFORMATION); PFILE_FS_VOLUME_INFORMATION pfvi = (PFILE_FS_VOLUME_INFORMATION) alloca (fvi_size); PFILE_ALL_INFORMATION pfai = (PFILE_ALL_INFORMATION) alloca (fai_size); status = NtQueryVolumeInformationFile (get_handle (), &io, pfvi, fvi_size, FileFsVolumeInformation); if (!NT_SUCCESS (status)) { debug_printf ("%u = NtQueryVolumeInformationFile)", RtlNtStatusToDosError (status)); pfvi->VolumeSerialNumber = 0; /* Set to pc.volser () in helper. */ } status = NtQueryInformationFile (get_handle (), &io, pfai, fai_size, FileAllInformation); if (NT_SUCCESS (status)) { /* If the change time is 0, it's a file system which doesn't support a change timestamp. In that case use the LastWriteTime entry, as in other calls to fstat_helper. */ pc.file_attributes (pfai->BasicInformation.FileAttributes); return fstat_helper (buf, pfai->BasicInformation.ChangeTime.QuadPart ? *(FILETIME *) &pfai->BasicInformation.ChangeTime : *(FILETIME *) &pfai->BasicInformation.LastWriteTime, *(FILETIME *) &pfai->BasicInformation.LastAccessTime, *(FILETIME *) &pfai->BasicInformation.LastWriteTime, pfvi->VolumeSerialNumber, pfai->StandardInformation.EndOfFile.HighPart, pfai->StandardInformation.EndOfFile.LowPart, pfai->StandardInformation.AllocationSize.QuadPart, pfai->InternalInformation.IndexNumber.HighPart, pfai->InternalInformation.IndexNumber.LowPart, pfai->StandardInformation.NumberOfLinks, pfai->BasicInformation.FileAttributes); } debug_printf ("%u = NtQueryInformationFile)", RtlNtStatusToDosError (status)); } BOOL res = GetFileInformationByHandle (get_handle (), &local); debug_printf ("%d = GetFileInformationByHandle (%s, %d)", res, get_win32_name (), get_handle ()); /* GetFileInformationByHandle will fail if it's given stdio handle or pipe. It also fails on 9x when trying to access directories on shares. */ if (!res) { memset (&local, 0, sizeof (local)); local.nFileSizeLow = GetFileSize (get_handle (), &local.nFileSizeHigh); /* Even GetFileSize fails on 9x when trying to access directories on shares. In this case reset filesize to 0. */ if (local.nFileSizeLow == 0xffffffff && GetLastError ()) local.nFileSizeLow = 0; local.dwFileAttributes = DWORD (pc); } else pc.file_attributes (local.dwFileAttributes); return fstat_helper (buf, local.ftLastWriteTime, /* see fstat_helper comment */ local.ftLastAccessTime, local.ftLastWriteTime, local.dwVolumeSerialNumber, local.nFileSizeHigh, local.nFileSizeLow, -1LL, local.nFileIndexHigh, local.nFileIndexLow, local.nNumberOfLinks, local.dwFileAttributes); } int __stdcall fhandler_base::fstat_by_name (struct __stat64 *buf) { int res; HANDLE handle; WIN32_FIND_DATA local; if (!pc.exists ()) { debug_printf ("already determined that pc does not exist"); set_errno (ENOENT); res = -1; } else if ((handle = FindFirstFile (pc, &local)) != INVALID_HANDLE_VALUE) { FindClose (handle); pc.file_attributes (local.dwFileAttributes); res = fstat_helper (buf, local.ftLastWriteTime, /* see fstat_helper comment */ local.ftLastAccessTime, local.ftLastWriteTime, pc.volser (), local.nFileSizeHigh, local.nFileSizeLow, -1LL, 0, 0, 1, local.dwFileAttributes); } else if (pc.isdir ()) { FILETIME ft = {}; res = fstat_helper (buf, ft, ft, ft, pc.volser (), 0, 0, -1LL, 0, 0, 1, FILE_ATTRIBUTE_DIRECTORY); } else { debug_printf ("FindFirstFile failed for '%s', %E", (char *) pc); __seterrno (); res = -1; } return res; } int __stdcall fhandler_base::fstat_fs (struct __stat64 *buf) { int res = -1; int oret; int open_flags = O_RDONLY | O_BINARY; if (get_io_handle ()) { if (nohandle () || is_fs_special ()) return fstat_by_name (buf); else return fstat_by_handle (buf); } /* If we don't care if the file is executable or we already know if it is, then just do a "query open" as it is apparently much faster. */ if (pc.exec_state () != dont_know_if_executable) { if (pc.fs_is_fat () && !strpbrk (get_win32_name (), "?*|<>")) return fstat_by_name (buf); query_open (query_stat_control); } if (!(oret = open_fs (open_flags, 0)) && get_errno () == EACCES) { /* If we couldn't open the file, try a query open with no permissions. This allows us to determine *some* things about the file, at least. */ pc.set_exec (0); query_open (query_read_control); oret = open_fs (open_flags, 0); } if (oret) { /* We now have a valid handle, regardless of the "nohandle" state. Since fhandler_base::open only calls CloseHandle if !nohandle, we have to set it to false before calling close_fs and restore the state afterwards. */ res = fstat_by_handle (buf); bool no_handle = nohandle (); nohandle (false); close_fs (); nohandle (no_handle); set_io_handle (NULL); } else res = fstat_by_name (buf); return res; } /* The ftChangeTime is taken from the NTFS ChangeTime entry, if reading the file information using NtQueryInformationFile succeeded. If not, it's faked using the LastWriteTime entry from GetFileInformationByHandle or FindFirstFile. We're deliberatly not using the creation time anymore to simplify interaction with native Windows applications which choke on creation times >= access or write times. Note that the dwFileAttributes member of the file information evaluated in the calling function is used here, not the pc.fileattr member, since the latter might be old and not reflect the actual state of the file. */ int __stdcall fhandler_base::fstat_helper (struct __stat64 *buf, FILETIME ftChangeTime, FILETIME ftLastAccessTime, FILETIME ftLastWriteTime, DWORD dwVolumeSerialNumber, DWORD nFileSizeHigh, DWORD nFileSizeLow, LONGLONG nAllocSize, DWORD nFileIndexHigh, DWORD nFileIndexLow, DWORD nNumberOfLinks, DWORD dwFileAttributes) { IO_STATUS_BLOCK st; FILE_COMPRESSION_INFORMATION fci; to_timestruc_t (&ftLastAccessTime, &buf->st_atim); to_timestruc_t (&ftLastWriteTime, &buf->st_mtim); to_timestruc_t (&ftChangeTime, &buf->st_ctim); buf->st_dev = dwVolumeSerialNumber ?: pc.volser (); buf->st_size = ((_off64_t) nFileSizeHigh << 32) + nFileSizeLow; /* The number of links to a directory includes the number of subdirectories in the directory, since all those subdirectories point to it. This is too slow on remote drives, so we do without it. Setting the count to 2 confuses `find (1)' command. So let's try it with `1' as link count. */ buf->st_nlink = pc.ndisk_links (nNumberOfLinks); /* Assume that if a drive has ACL support it MAY have valid "inodes". It definitely does not have valid inodes if it does not have ACL support. */ switch (pc.has_acls () && (nFileIndexHigh || nFileIndexLow) ? pc.drive_type () : DRIVE_UNKNOWN) { case DRIVE_FIXED: case DRIVE_REMOVABLE: case DRIVE_CDROM: case DRIVE_RAMDISK: /* Although the documentation indicates otherwise, it seems like "inodes" on these devices are persistent, at least across reboots. */ buf->st_ino = (((__ino64_t) nFileIndexHigh) << 32) | (__ino64_t) nFileIndexLow; break; default: /* Either the nFileIndex* fields are unreliable or unavailable. Use the next best alternative. */ buf->st_ino = get_namehash (); break; } buf->st_blksize = S_BLKSIZE; if (nAllocSize >= 0LL) /* A successful NtQueryInformationFile returns the allocation size correctly for compressed and sparse files as well. */ buf->st_blocks = (nAllocSize + S_BLKSIZE - 1) / S_BLKSIZE; else if (::has_attribute (dwFileAttributes, FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_SPARSE_FILE) && get_io_handle () && !is_fs_special () && !NtQueryInformationFile (get_io_handle (), &st, (PVOID) &fci, sizeof fci, FileCompressionInformation)) /* Otherwise we request the actual amount of bytes allocated for compressed and sparsed files. */ buf->st_blocks = (fci.CompressedSize.QuadPart + S_BLKSIZE - 1) / S_BLKSIZE; else /* Otherwise compute no. of blocks from file size. */ buf->st_blocks = (buf->st_size + S_BLKSIZE - 1) / S_BLKSIZE; buf->st_mode = 0; /* Using a side effect: get_file_attibutes checks for directory. This is used, to set S_ISVTX, if needed. */ if (pc.isdir ()) buf->st_mode = S_IFDIR; else if (pc.issymlink ()) { buf->st_size = pc.get_symlink_length (); /* symlinks are everything for everyone! */ buf->st_mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; get_file_attribute (pc.has_acls (), get_io_handle (), get_win32_name (), NULL, &buf->st_uid, &buf->st_gid); goto done; } else if (pc.issocket ()) buf->st_mode = S_IFSOCK; if (!get_file_attribute (pc.has_acls (), is_fs_special () ? NULL: get_io_handle (), get_win32_name (), &buf->st_mode, &buf->st_uid, &buf->st_gid)) { /* If read-only attribute is set, modify ntsec return value */ if (::has_attribute (dwFileAttributes, FILE_ATTRIBUTE_READONLY) && !pc.issymlink ()) buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); if (buf->st_mode & S_IFMT) /* nothing */; else if (!is_fs_special ()) buf->st_mode |= S_IFREG; else { buf->st_dev = dev (); buf->st_mode = dev ().mode; } } else { buf->st_mode |= STD_RBITS; if (!::has_attribute (dwFileAttributes, FILE_ATTRIBUTE_READONLY) && !pc.issymlink ()) buf->st_mode |= STD_WBITS; /* | S_IWGRP | S_IWOTH; we don't give write to group etc */ if (S_ISDIR (buf->st_mode)) buf->st_mode |= S_IFDIR | STD_XBITS; else if (buf->st_mode & S_IFMT) /* nothing */; else if (is_fs_special ()) { buf->st_dev = dev (); buf->st_mode = dev ().mode; } else { buf->st_mode |= S_IFREG; if (pc.exec_state () == dont_know_if_executable) { DWORD cur, done; char magic[3]; /* First retrieve current position, set to beginning of file if not already there. */ cur = SetFilePointer (get_handle (), 0, NULL, FILE_CURRENT); if (cur != INVALID_SET_FILE_POINTER && (!cur || SetFilePointer (get_handle (), 0, NULL, FILE_BEGIN) != INVALID_SET_FILE_POINTER)) { /* FIXME should we use /etc/magic ? */ magic[0] = magic[1] = magic[2] = '\0'; if (ReadFile (get_handle (), magic, 3, &done, NULL) && has_exec_chars (magic, done)) { pc.set_exec (); buf->st_mode |= STD_XBITS; } SetFilePointer (get_handle (), cur, NULL, FILE_BEGIN); } } } if (pc.exec_state () == is_executable) buf->st_mode |= STD_XBITS; /* This fakes the permissions of all files to match the current umask. */ buf->st_mode &= ~(cygheap->umask); } done: syscall_printf ("0 = fstat (, %p) st_atime=%x st_size=%D, st_mode=%p, st_ino=%d, sizeof=%d", buf, buf->st_atime, buf->st_size, buf->st_mode, (int) buf->st_ino, sizeof (*buf)); return 0; } int __stdcall fhandler_disk_file::fstat (struct __stat64 *buf) { /* Changing inode data requires setting ctime (only 9x). */ if (has_changed ()) touch_ctime (); return fstat_fs (buf); } void fhandler_disk_file::touch_ctime () { FILETIME ft; GetSystemTimeAsFileTime (&ft); /* Modification time is touched if the file data has changed as well. This happens for instance on write() or ftruncate(). */ if (!SetFileTime (get_io_handle (), NULL, NULL, &ft)) debug_printf ("SetFileTime (%s) failed, %E", get_win32_name ()); else has_changed (false); } int __stdcall fhandler_disk_file::fchmod (mode_t mode) { extern int chmod_device (path_conv& pc, mode_t mode); int res = -1; int oret = 0; if (pc.is_fs_special ()) return chmod_device (pc, mode); /* Also open on 9x, otherwise we can't touch ctime. */ if (!get_io_handle ()) { query_open (query_write_control); if (!(oret = open (O_BINARY, 0))) { /* If the file couldn't be opened, that's really only a problem if ACLs or EAs should get written. */ if ((allow_ntsec && pc.has_acls ()) || allow_ntea) return -1; } } if ((allow_ntsec && pc.has_acls ()) || allow_ntea) { if (!allow_ntsec && allow_ntea) /* Not necessary when manipulating SD. */ SetFileAttributes (pc, (DWORD) pc & ~FILE_ATTRIBUTE_READONLY); if (pc.isdir ()) mode |= S_IFDIR; if (!set_file_attribute (pc.has_acls (), get_io_handle (), pc, ILLEGAL_UID, ILLEGAL_GID, mode) && allow_ntsec) res = 0; } /* if the mode we want has any write bits set, we can't be read only. */ if (mode & (S_IWUSR | S_IWGRP | S_IWOTH)) pc &= (DWORD) ~FILE_ATTRIBUTE_READONLY; else pc |= (DWORD) FILE_ATTRIBUTE_READONLY; if (!SetFileAttributes (pc, pc)) __seterrno (); else if (!allow_ntsec || !pc.has_acls ()) /* Correct NTFS security attributes have higher priority */ res = 0; /* Set ctime on success. */ if (!res && !wincap.is_winnt ()) has_changed (true); if (oret) close (); return res; } int __stdcall fhandler_disk_file::fchown (__uid32_t uid, __gid32_t gid) { int oret = 0; if (!pc.has_acls () || !allow_ntsec) { /* fake - if not supported, pretend we're like win95 where it just works */ return 0; } if (!get_io_handle ()) { query_open (query_write_control); if (!(oret = fhandler_disk_file::open (O_BINARY, 0))) return -1; } mode_t attrib = 0; if (pc.isdir ()) attrib |= S_IFDIR; int res = get_file_attribute (pc.has_acls (), get_io_handle (), pc, &attrib); if (!res) res = set_file_attribute (pc.has_acls (), get_io_handle (), pc, uid, gid, attrib); if (oret) close (); return res; } int _stdcall fhandler_disk_file::facl (int cmd, int nentries, __aclent32_t *aclbufp) { int res = -1; int oret = 0; if (!pc.has_acls () || !allow_ntsec) { switch (cmd) { struct __stat64 st; case SETACL: /* Open for writing required to be able to set ctime (even though setting the ACL is just pretended). */ if (!get_io_handle ()) oret = open (O_WRONLY | O_BINARY, 0); res = 0; break; case GETACL: if (!aclbufp) set_errno(EFAULT); else if (nentries < MIN_ACL_ENTRIES) set_errno (ENOSPC); else { if (!get_io_handle ()) { query_open (query_read_control); if (!(oret = open (O_BINARY, 0))) return -1; } if (!fstat_by_handle (&st)) { aclbufp[0].a_type = USER_OBJ; aclbufp[0].a_id = st.st_uid; aclbufp[0].a_perm = (st.st_mode & S_IRWXU) >> 6; aclbufp[1].a_type = GROUP_OBJ; aclbufp[1].a_id = st.st_gid; aclbufp[1].a_perm = (st.st_mode & S_IRWXG) >> 3; aclbufp[2].a_type = OTHER_OBJ; aclbufp[2].a_id = ILLEGAL_GID; aclbufp[2].a_perm = st.st_mode & S_IRWXO; 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; } } else { if (!get_io_handle ()) { query_open (cmd == SETACL ? query_write_control : query_read_control); if (!(oret = open (O_BINARY, 0))) return -1; } switch (cmd) { case SETACL: if (!aclsort32 (nentries, 0, aclbufp)) res = setacl (get_io_handle (), pc, nentries, aclbufp); break; case GETACL: if (!aclbufp) set_errno(EFAULT); else res = getacl (get_io_handle (), pc, pc, nentries, aclbufp); break; case GETACLCNT: res = getacl (get_io_handle (), pc, pc, 0, NULL); break; default: set_errno (EINVAL); break; } } if (oret) close (); return res; } int fhandler_disk_file::ftruncate (_off64_t length) { int res = -1, res_bug = 0; if (length < 0 || !get_output_handle ()) set_errno (EINVAL); else if (pc.isdir ()) set_errno (EISDIR); else if (!(get_access () & GENERIC_WRITE)) set_errno (EBADF); else { _off64_t prev_loc = lseek (0, SEEK_CUR); if (lseek (length, SEEK_SET) >= 0) { if (get_fs_flags (FILE_SUPPORTS_SPARSE_FILES)) { _off64_t actual_length; DWORD size_high = 0; actual_length = GetFileSize (get_output_handle (), &size_high); actual_length += ((_off64_t) size_high) << 32; if (length >= actual_length + (128 * 1024)) { DWORD dw; BOOL r = DeviceIoControl (get_output_handle (), FSCTL_SET_SPARSE, NULL, 0, NULL, 0, &dw, NULL); syscall_printf ("%d = DeviceIoControl(%p, FSCTL_SET_SPARSE)", r, get_output_handle ()); } } else if (wincap.has_lseek_bug ()) res_bug = write (&res, 0); if (!SetEndOfFile (get_output_handle ())) __seterrno (); else res = res_bug; /* restore original file pointer location */ lseek (prev_loc, SEEK_SET); } } return res; } int fhandler_disk_file::link (const char *newpath) { path_conv newpc (newpath, PC_SYM_NOFOLLOW | PC_POSIX); extern bool allow_winsymlinks; if (newpc.error) { set_errno (newpc.case_clash ? ECASECLASH : newpc.error); return -1; } if (newpc.exists ()) { syscall_printf ("file '%s' exists?", (char *) newpc); set_errno (EEXIST); return -1; } if (newpc[strlen (newpc) - 1] == '.') { syscall_printf ("trailing dot, bailing out"); set_errno (EINVAL); return -1; } /* Shortcut hack. */ char new_lnk_buf[CYG_MAX_PATH + 5]; if (allow_winsymlinks && pc.is_lnk_special () && !newpc.case_clash) { strcpy (new_lnk_buf, newpath); strcat (new_lnk_buf, ".lnk"); newpath = new_lnk_buf; newpc.check (newpath, PC_SYM_NOFOLLOW); } query_open (query_write_attributes); if (!open (O_BINARY, 0)) { syscall_printf ("Opening file failed"); __seterrno (); return -1; } /* Try to make hard link first on Windows NT */ if (wincap.has_hard_links ()) { if (CreateHardLinkA (newpc, pc, NULL)) goto success; /* There are two cases to consider: - The FS doesn't support hard links ==> ERROR_INVALID_FUNCTION We copy the file. - CreateHardLinkA is not supported ==> ERROR_PROC_NOT_FOUND In that case (<= NT4) we try the old-style method. Any other error should be taken seriously. */ if (GetLastError () == ERROR_INVALID_FUNCTION) { syscall_printf ("FS doesn't support hard links: Copy file"); goto docopy; } if (GetLastError () != ERROR_PROC_NOT_FOUND) { syscall_printf ("CreateHardLinkA failed"); __seterrno (); close (); return -1; } WIN32_STREAM_ID stream_id; LPVOID context; WCHAR wbuf[CYG_MAX_PATH]; BOOL ret; DWORD written, write_err, path_len, size; path_len = sys_mbstowcs (wbuf, newpc, CYG_MAX_PATH) * sizeof (WCHAR); stream_id.dwStreamId = BACKUP_LINK; stream_id.dwStreamAttributes = 0; stream_id.dwStreamNameSize = 0; stream_id.Size.HighPart = 0; stream_id.Size.LowPart = path_len; size = sizeof (WIN32_STREAM_ID) - sizeof (WCHAR**) + stream_id.dwStreamNameSize; context = NULL; write_err = 0; /* Write WIN32_STREAM_ID */ ret = BackupWrite (get_handle (), (LPBYTE) &stream_id, size, &written, FALSE, FALSE, &context); if (ret) { /* write the buffer containing the path */ /* FIXME: BackupWrite sometimes traps if linkname is invalid. Need to handle. */ ret = BackupWrite (get_handle (), (LPBYTE) wbuf, path_len, &written, FALSE, FALSE, &context); if (!ret) { write_err = GetLastError (); syscall_printf ("cannot write linkname, %E"); } /* Free context */ BackupWrite (get_handle (), NULL, 0, &written, TRUE, FALSE, &context); } else { write_err = GetLastError (); syscall_printf ("cannot write stream_id, %E"); } if (!ret) { /* Only copy file if FS doesn't support hard links */ if (write_err == ERROR_INVALID_FUNCTION) { syscall_printf ("FS doesn't support hard links: Copy file"); goto docopy; } close (); __seterrno_from_win_error (write_err); return -1; } success: close (); if (!allow_winsymlinks && pc.is_lnk_special ()) SetFileAttributes (newpc, (DWORD) pc | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_READONLY); return 0; } docopy: /* do this with a copy */ if (!CopyFileA (pc, newpc, 1)) { __seterrno (); return -1; } /* Set ctime on success (copy gets it automatically). */ if (!wincap.is_winnt ()) has_changed (true); close (); fhandler_disk_file fh (newpc); fh.query_open (query_write_attributes); if (fh.open (O_BINARY, 0)) fh.close (); return 0; } int fhandler_disk_file::utimes (const struct timeval *tvp) { return utimes_fs (tvp); } int fhandler_base::utimes_fs (const struct timeval *tvp) { FILETIME lastaccess, lastwrite; struct timeval tmp[2]; bool closeit; if (get_handle ()) closeit = false; else { query_open (query_write_attributes); if (!open_fs (O_BINARY, 0)) { /* It's documented in MSDN that FILE_WRITE_ATTRIBUTES is sufficient to change the timestamps. Unfortunately it's not sufficient for a remote HPFS which requires GENERIC_WRITE, so we just retry to open for writing, though this fails for R/O files of course. */ query_open (no_query); if (!open_fs (O_WRONLY | O_BINARY, 0)) { syscall_printf ("Opening file failed"); return -1; } } closeit = true; } if (nohandle ()) /* Directory query_open on 9x. */ return 0; gettimeofday (&tmp[0], 0); if (!tvp) { tmp[1] = tmp[0]; tvp = tmp; } timeval_to_filetime (&tvp[0], &lastaccess); timeval_to_filetime (&tvp[1], &lastwrite); debug_printf ("incoming lastaccess %08x %08x", tvp[0].tv_sec, tvp[0].tv_usec); if (is_fs_special ()) SetFileAttributes (pc, (DWORD) pc & ~FILE_ATTRIBUTE_READONLY); BOOL res = SetFileTime (get_handle (), NULL, &lastaccess, &lastwrite); DWORD errcode = GetLastError (); if (is_fs_special ()) SetFileAttributes (pc, pc); /* Opening a directory on a 9x share from a NT machine works(!), but then the SetFileTimes fails with ERROR_NOT_SUPPORTED. Oh well... */ if (!res && errcode != ERROR_NOT_SUPPORTED) { close (); __seterrno_from_win_error (errcode); return -1; } if (closeit) close (); return 0; } fhandler_disk_file::fhandler_disk_file () : fhandler_base () { } fhandler_disk_file::fhandler_disk_file (path_conv &pc) : fhandler_base () { set_name (pc); } int fhandler_disk_file::open (int flags, mode_t mode) { return open_fs (flags, mode); } int fhandler_base::open_fs (int flags, mode_t mode) { if (pc.case_clash && flags & O_CREAT) { debug_printf ("case clash detected"); set_errno (ECASECLASH); return 0; } /* Unfortunately NT allows to open directories for writing, but that's disallowed according to SUSv3. */ if (pc.isdir () && (flags & (O_WRONLY | O_RDWR))) { set_errno (EISDIR); return 0; } int res = fhandler_base::open (flags | O_DIROPEN, mode); if (!res) goto out; /* This is for file systems known for having a buggy CreateFile call which might return a valid HANDLE without having actually opened the file. The only known file system to date is the SUN NFS Solstice Client 3.1 which returns a valid handle when trying to open a file in a nonexistent directory. */ if (pc.has_buggy_open () && !pc.exists ()) { debug_printf ("Buggy open detected."); close_fs (); set_errno (ENOENT); return 0; } /* Attributes may be set only if a file is _really_ created. This code is now only used for ntea here since the files security attributes are set in CreateFile () now. */ if (flags & O_CREAT && GetLastError () != ERROR_ALREADY_EXISTS && !allow_ntsec && allow_ntea) set_file_attribute (false, NULL, get_win32_name (), mode); set_fs_flags (pc.fs_flags ()); out: syscall_printf ("%d = fhandler_disk_file::open (%s, %p)", res, get_win32_name (), flags); return res; } int fhandler_disk_file::close () { if (!hExeced) { /* Changing inode data requires setting ctime (only 9x). */ if (has_changed ()) touch_ctime (); } return close_fs (); } int fhandler_base::close_fs () { int res = fhandler_base::close (); if (!res) user_shared->delqueue.process_queue (); return res; } ssize_t __stdcall fhandler_disk_file::pread (void *buf, size_t count, _off64_t offset) { ssize_t res; _off64_t curpos = lseek (0, SEEK_CUR); if (curpos < 0 || lseek (offset, SEEK_SET) < 0) res = -1; else { size_t tmp_count = count; read (buf, tmp_count); if (lseek (curpos, SEEK_SET) == 0) res = (ssize_t) tmp_count; else res = -1; } debug_printf ("%d = pread (%p, %d, %d)\n", res, buf, count, offset); return res; } ssize_t __stdcall fhandler_disk_file::pwrite (void *buf, size_t count, _off64_t offset) { int res; _off64_t curpos = lseek (0, SEEK_CUR); if (curpos < 0 || lseek (offset, SEEK_SET) < 0) res = curpos; else { res = (ssize_t) write (buf, count); if (lseek (curpos, SEEK_SET) < 0) res = -1; } debug_printf ("%d = pwrite (%p, %d, %d)\n", res, buf, count, offset); return res; } /* FIXME: The correct way to do this to get POSIX locking semantics is to keep a linked list of posix lock requests and map them into Win32 locks. he problem is that Win32 does not deal correctly with overlapping lock requests. Also another pain is that Win95 doesn't do non-blocking or non-exclusive locks at all. For '95 just convert all lock requests into blocking,exclusive locks. This shouldn't break many apps but denying all locking would. For now just convert to Win32 locks and hope for the best. */ int fhandler_disk_file::lock (int cmd, struct __flock64 *fl) { _off64_t win32_start; _off64_t win32_len; _off64_t startpos; /* * We don't do getlck calls yet. */ if (cmd == F_GETLK) { set_errno (ENOSYS); return -1; } /* * Calculate where in the file to start from, * then adjust this by fl->l_start. */ switch (fl->l_whence) { case SEEK_SET: startpos = 0; break; case SEEK_CUR: if ((startpos = lseek (0, SEEK_CUR)) == ILLEGAL_SEEK) return -1; break; case SEEK_END: { BY_HANDLE_FILE_INFORMATION finfo; if (GetFileInformationByHandle (get_handle (), &finfo) == 0) { __seterrno (); return -1; } startpos = ((_off64_t)finfo.nFileSizeHigh << 32) + finfo.nFileSizeLow; break; } default: set_errno (EINVAL); return -1; } /* * Now the fun starts. Adjust the start and length * fields until they make sense. */ win32_start = startpos + fl->l_start; if (fl->l_len < 0) { win32_start -= fl->l_len; win32_len = -fl->l_len; } else win32_len = fl->l_len; if (win32_start < 0) { /* watch the signs! */ win32_len -= -win32_start; if (win32_len <= 0) { /* Failure ! */ set_errno (EINVAL); return -1; } win32_start = 0; } DWORD off_high, off_low, len_high, len_low; off_low = (DWORD)(win32_start & UINT32_MAX); off_high = (DWORD)(win32_start >> 32); if (win32_len == 0) { /* Special case if len == 0 for POSIX means lock to the end of the entire file (and all future extensions). */ /* CV, 2003-12-03: And yet another Win 9x bugginess. For some reason offset + length must be <= 0x100000000. I'm using 0xffffffff as upper border here, this should be sufficient. */ len_low = UINT32_MAX - (wincap.lock_file_highword () ? 0 : off_low); len_high = wincap.lock_file_highword (); } else { len_low = (DWORD)(win32_len & UINT32_MAX); len_high = (DWORD)(win32_len >> 32); } BOOL res; if (wincap.has_lock_file_ex ()) { DWORD lock_flags = (cmd == F_SETLK) ? LOCKFILE_FAIL_IMMEDIATELY : 0; lock_flags |= (fl->l_type == F_WRLCK) ? LOCKFILE_EXCLUSIVE_LOCK : 0; OVERLAPPED ov; ov.Internal = 0; ov.InternalHigh = 0; ov.Offset = off_low; ov.OffsetHigh = off_high; ov.hEvent = (HANDLE) 0; if (fl->l_type == F_UNLCK) { res = UnlockFileEx (get_handle (), 0, len_low, len_high, &ov); } else { res = LockFileEx (get_handle (), lock_flags, 0, len_low, len_high, &ov); /* Deal with the fail immediately case. */ /* * FIXME !! I think this is the right error to check for * but I must admit I haven't checked.... */ if ((res == 0) && (lock_flags & LOCKFILE_FAIL_IMMEDIATELY) && (GetLastError () == ERROR_LOCK_FAILED)) { set_errno (EAGAIN); return -1; } } } else { /* Windows 95 -- use primitive lock call */ if (fl->l_type == F_UNLCK) res = UnlockFile (get_handle (), off_low, off_high, len_low, len_high); else res = LockFile (get_handle (), off_low, off_high, len_low, len_high); } if (res == 0) { __seterrno (); return -1; } return 0; } int fhandler_disk_file::mkdir (mode_t mode) { int res = -1; SECURITY_ATTRIBUTES sa = sec_none_nih; security_descriptor sd; if (allow_ntsec && has_acls ()) set_security_attribute (S_IFDIR | ((mode & 07777) & ~cygheap->umask), &sa, sd); if (CreateDirectoryA (get_win32_name (), &sa)) { if (!allow_ntsec && allow_ntea) set_file_attribute (false, NULL, get_win32_name (), S_IFDIR | ((mode & 07777) & ~cygheap->umask)); #ifdef HIDDEN_DOT_FILES char *c = strrchr (real_dir.get_win32 (), '\\'); if ((c && c[1] == '.') || *get_win32_name () == '.') SetFileAttributes (get_win32_name (), FILE_ATTRIBUTE_HIDDEN); #endif res = 0; } else __seterrno (); return res; } int fhandler_disk_file::rmdir () { int res = -1; /* Even own directories can't be removed if R/O attribute is set. */ if (pc.has_attribute (FILE_ATTRIBUTE_READONLY)) SetFileAttributes (get_win32_name (), (DWORD) pc & ~FILE_ATTRIBUTE_READONLY); for (bool is_cwd = false; ; is_cwd = true) { DWORD err, att = 0; int rc = RemoveDirectory (get_win32_name ()); if (isremote () && exists ()) att = GetFileAttributes (get_win32_name ()); /* Sometimes smb indicates failure when it really succeeds, so check for this case specifically. */ if (rc || att == INVALID_FILE_ATTRIBUTES) { /* RemoveDirectory on a samba drive doesn't return an error if the directory can't be removed because it's not empty. Checking for existence afterwards keeps us informed about success. */ if (!isremote () || att == INVALID_FILE_ATTRIBUTES) { res = 0; break; } err = ERROR_DIR_NOT_EMPTY; } else err = GetLastError (); /* This kludge detects if we are attempting to remove the current working directory. If so, we will move elsewhere to potentially allow the rmdir to succeed. This means that cygwin's concept of the current working directory != Windows concept but, hey, whaddaregonnado? Note that this will not cause something like the following to work: $ cd foo $ rmdir . since the shell will have foo "open" in the above case and so Windows will not allow the deletion. (Actually it does on 9X.) FIXME: A potential workaround for this is for cygwin apps to *never* call SetCurrentDirectory. */ extern char windows_system_directory[]; if (strcasematch (get_win32_name (), cygheap->cwd.win32) && !strcasematch (windows_system_directory, cygheap->cwd.win32) && !is_cwd && SetCurrentDirectory (windows_system_directory)) continue; /* On 9X ERROR_ACCESS_DENIED is returned if you try to remove a non-empty directory. */ if (err == ERROR_ACCESS_DENIED && wincap.access_denied_on_delete ()) err = ERROR_DIR_NOT_EMPTY; /* ...and, that's *not* funny, when trying to remove a non-existing directory on a share, which is hosted by a 9x machine, the error code ERROR_INVALID_FUNCTION is returned. */ else if (err == ERROR_INVALID_FUNCTION) err = ERROR_FILE_NOT_FOUND; __seterrno_from_win_error (err); /* Directory still exists, restore its characteristics. */ if (pc.has_attribute (FILE_ATTRIBUTE_READONLY)) SetFileAttributes (get_win32_name (), (DWORD) pc); if (is_cwd) SetCurrentDirectory (get_win32_name ()); break; } return res; } DIR * fhandler_disk_file::opendir () { DIR *dir; DIR *res = NULL; size_t len; path_conv rootdir ("/"); if (!pc.isdir ()) set_errno (ENOTDIR); else if ((len = strlen (pc)) > CYG_MAX_PATH - 3) set_errno (ENAMETOOLONG); else if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL) set_errno (ENOMEM); else if ((dir->__d_dirname = (char *) malloc (len + 3)) == NULL) { set_errno (ENOMEM); goto free_dir; } else if ((dir->__d_dirent = (struct dirent *) malloc (sizeof (struct dirent))) == NULL) { set_errno (ENOMEM); goto free_dirname; } else if (fhaccess (R_OK) != 0) goto free_dirent; else { strcpy (dir->__d_dirname, get_win32_name ()); dir->__d_dirent->d_version = __DIRENT_VERSION; cygheap_fdnew fd; if (fd < 0) goto free_dirent; fd = this; fd->nohandle (true); dir->__d_dirent->d_fd = fd; dir->__fh = this; /* FindFirstFile doesn't seem to like duplicate /'s. */ len = strlen (dir->__d_dirname); if (len == 0 || isdirsep (dir->__d_dirname[len - 1])) strcat (dir->__d_dirname, "*"); else strcat (dir->__d_dirname, "\\*"); /**/ dir->__d_cookie = __DIRENT_COOKIE; dir->__handle = INVALID_HANDLE_VALUE; dir->__d_position = 0; dir->__d_dirhash = get_namehash (); res = dir; dir->__flags = strcasematch (pc, rootdir) ? dirent_isroot : 0; } syscall_printf ("%p = opendir (%s)", res, get_name ()); return res; free_dirent: free (dir->__d_dirent); free_dirname: free (dir->__d_dirname); free_dir: free (dir); return res; } int fhandler_disk_file::readdir (DIR *dir, dirent *de) { WIN32_FIND_DATA buf; HANDLE handle; int res; if (!dir->__handle) { res = ENMFILE; goto out; } if (dir->__handle == INVALID_HANDLE_VALUE && dir->__d_position == 0) { handle = FindFirstFileA (dir->__d_dirname, &buf); DWORD lasterr = GetLastError (); dir->__handle = handle; if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) { res = geterrno_from_win_error (); goto out; } } else if (dir->__handle == INVALID_HANDLE_VALUE) { res = EBADF; goto out; } else if (!FindNextFileA (dir->__handle, &buf)) { bool added = false; if (!(dir->__flags & dirent_isroot)) /* nothing */; else if (0 && !(dir->__flags & dirent_saw_dev)) { strcpy (buf.cFileName, "dev"); added = true; } else if (!(dir->__flags & dirent_saw_proc)) { strcpy (buf.cFileName, "proc"); added = true; } else if (!(dir->__flags & dirent_saw_cygdrive) && mount_table->cygdrive_len > 1) { strcpy (buf.cFileName, mount_table->cygdrive + 1); buf.cFileName[mount_table->cygdrive_len - 2] = '\0'; added = true; } if (added) buf.dwFileAttributes = 0; else { res = geterrno_from_win_error (); FindClose (dir->__handle); dir->__handle = NULL; goto out; } } /* Check for Windows shortcut. If it's a Cygwin or U/WIN symlink, drop the .lnk suffix. */ if (buf.dwFileAttributes & FILE_ATTRIBUTE_READONLY) { char *c = buf.cFileName; int len = strlen (c); if (strcasematch (c + len - 4, ".lnk")) { char fbuf[CYG_MAX_PATH]; strcpy (fbuf, dir->__d_dirname); strcpy (fbuf + strlen (fbuf) - 1, c); path_conv fpath (fbuf, PC_SYM_NOFOLLOW); if (fpath.issymlink () || fpath.isspecial ()) c[len - 4] = '\0'; } } /* We get here if `buf' contains valid data. */ if (pc.isencoded ()) fnunmunge (de->d_name, buf.cFileName); else strcpy (de->d_name, buf.cFileName); if (dir->__flags && dirent_isroot) { if (strcasematch (de->d_name, "dev")) dir->__flags |= dirent_saw_dev; else if (strcasematch (de->d_name, "proc")) dir->__flags |= dirent_saw_proc; if (strlen (de->d_name) == mount_table->cygdrive_len - 2 && strncasematch (de->d_name, mount_table->cygdrive + 1, mount_table->cygdrive_len - 2)) dir->__flags |= dirent_saw_cygdrive; } dir->__d_position++; res = 0; out: syscall_printf ("%d = readdir (%p) (%s)", dir, &de, de->d_name); return res; } _off64_t fhandler_disk_file::telldir (DIR *dir) { return dir->__d_position; } void fhandler_disk_file::seekdir (DIR *dir, _off64_t loc) { rewinddir (dir); while (loc > dir->__d_position) if (!::readdir (dir)) break; } void fhandler_disk_file::rewinddir (DIR *dir) { if (dir->__handle != INVALID_HANDLE_VALUE) { if (dir->__handle) FindClose (dir->__handle); dir->__handle = INVALID_HANDLE_VALUE; } dir->__d_position = 0; } int fhandler_disk_file::closedir (DIR *dir) { int res = 0; if (dir->__handle && dir->__handle != INVALID_HANDLE_VALUE && FindClose (dir->__handle) == 0) { __seterrno (); res = -1; } syscall_printf ("%d = closedir (%p)", res, dir); return 0; } fhandler_cygdrive::fhandler_cygdrive () : fhandler_disk_file (), ndrives (0), pdrive (NULL) { } #define DRVSZ sizeof ("x:\\") void fhandler_cygdrive::set_drives () { const int len = 2 + 26 * DRVSZ; char *p = const_cast (get_win32_name ()); pdrive = p; ndrives = GetLogicalDriveStrings (len, p) / DRVSZ; } int fhandler_cygdrive::fstat (struct __stat64 *buf) { buf->st_mode = S_IFDIR | 0555; if (!ndrives) set_drives (); buf->st_nlink = ndrives + 2; return 0; } DIR * fhandler_cygdrive::opendir () { DIR *dir; dir = fhandler_disk_file::opendir (); if (dir && !ndrives) set_drives (); return dir; } int fhandler_cygdrive::readdir (DIR *dir, dirent *de) { if (!pdrive || !*pdrive) return ENMFILE; if (GetFileAttributes (pdrive) == INVALID_FILE_ATTRIBUTES) { pdrive = strchr (pdrive, '\0') + 1; return readdir (dir, de); } *de->d_name = cyg_tolower (*pdrive); de->d_name[1] = '\0'; dir->__d_position++; pdrive = strchr (pdrive, '\0') + 1; syscall_printf ("%p = readdir (%p) (%s)", &de, dir, de->d_name); return 0; } void fhandler_cygdrive::rewinddir (DIR *dir) { pdrive = get_win32_name (); dir->__d_position = 0; } int fhandler_cygdrive::closedir (DIR *dir) { pdrive = get_win32_name (); return 0; }