/* fhandler_disk_file.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 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 "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 #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) { int res = 0; BY_HANDLE_FILE_INFORMATION local; /* NT 3.51 seems to have a bug when attempting to get vol serial numbers. This loop gets around this. */ for (int i = 0; i < 2; i++) { if (!(res = GetFileInformationByHandle (get_handle (), &local))) break; if (local.dwVolumeSerialNumber && (long) local.dwVolumeSerialNumber != -1) break; } debug_printf ("%d = GetFileInformationByHandle (%s, %d)", res, get_win32_name (), get_handle ()); if (res == 0) /* GetFileInformationByHandle will fail if it's given stdin/out/err or a pipe*/ { memset (&local, 0, sizeof (local)); local.nFileSizeLow = GetFileSize (get_handle (), &local.nFileSizeHigh); } return fstat_helper (buf, local.ftCreationTime, local.ftLastAccessTime, local.ftLastWriteTime, local.nFileSizeHigh, local.nFileSizeLow, local.nFileIndexHigh, local.nFileIndexLow, local.nNumberOfLinks); } 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); res = fstat_helper (buf, local.ftCreationTime, local.ftLastAccessTime, local.ftLastWriteTime, local.nFileSizeHigh, local.nFileSizeLow); } else if (pc.isdir ()) { FILETIME ft = {}; res = fstat_helper (buf, ft, ft, ft, 0, 0); } 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 | O_DIROPEN; bool query_open_already; if (get_io_handle ()) { if (get_nohandle ()) 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) set_query_open (query_open_already = true); else query_open_already = false; if (query_open_already && strncasematch (pc.volname (), "FAT", 3) && !strpbrk (get_win32_name (), "?*|<>")) oret = 0; else if (!(oret = open_fs (open_flags, 0)) && !query_open_already && get_errno () == EACCES) { /* If we couldn't open the file, try a "query open" with no permissions. This will allow us to determine *some* things about the file, at least. */ pc.set_exec (0); set_query_open (true); oret = open_fs (open_flags, 0); } if (!oret || get_nohandle ()) res = fstat_by_name (buf); else { res = fstat_by_handle (buf); close_fs (); } return res; } int __stdcall fhandler_base::fstat_helper (struct __stat64 *buf, FILETIME ftCreationTime, FILETIME ftLastAccessTime, FILETIME ftLastWriteTime, DWORD nFileSizeHigh, DWORD nFileSizeLow, DWORD nFileIndexHigh, DWORD nFileIndexLow, DWORD nNumberOfLinks) { /* This is for FAT filesystems, which don't support atime/ctime */ if (ftLastAccessTime.dwLowDateTime == 0 && ftLastAccessTime.dwHighDateTime == 0) ftLastAccessTime = ftLastWriteTime; if (ftCreationTime.dwLowDateTime == 0 && ftCreationTime.dwHighDateTime == 0) ftCreationTime = ftLastWriteTime; to_timestruc_t (&ftLastAccessTime, &buf->st_atim); to_timestruc_t (&ftLastWriteTime, &buf->st_mtim); to_timestruc_t (&ftCreationTime, &buf->st_ctim); buf->st_dev = 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; /* GetCompressedFileSize() gets autoloaded. It returns INVALID_FILE_SIZE if it doesn't exist. Since that's also a valid return value on 64bit capable file systems, we must additionally check for the win32 error. */ nFileSizeLow = GetCompressedFileSizeA (pc, &nFileSizeHigh); if (nFileSizeLow != INVALID_FILE_SIZE || GetLastError () == NO_ERROR) /* On systems supporting compressed (and sparsed) files, GetCompressedFileSize() returns the actual amount of bytes allocated on disk. */ buf->st_blocks = (((_off64_t)nFileSizeHigh << 32) + nFileSizeLow + S_BLKSIZE - 1) / S_BLKSIZE; else /* Just 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 ()) { /* symlinks are everything for everyone! */ buf->st_mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; get_file_attribute (pc.has_acls (), 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 (), get_win32_name (), &buf->st_mode, &buf->st_uid, &buf->st_gid) == 0) { /* If read-only attribute is set, modify ntsec return value */ if (pc.has_attribute (FILE_ATTRIBUTE_READONLY) && !get_symlink_p ()) buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); if (!(buf->st_mode & S_IFMT)) buf->st_mode |= S_IFREG; } else { buf->st_mode |= STD_RBITS; if (!pc.has_attribute (FILE_ATTRIBUTE_READONLY)) 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)) { set_execable_p (); pc.set_exec (); buf->st_mode |= STD_XBITS; } (void) 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) { return fstat_fs (buf); } fhandler_disk_file::fhandler_disk_file () : fhandler_base () { } 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; } set_has_acls (pc.has_acls ()); set_isremote (pc.isremote ()); 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 (has_acls (), get_win32_name (), mode); set_fs_flags (pc.fs_flags ()); set_symlink_p (pc.issymlink ()); set_execable_p (pc.exec_state ()); set_socket_p (pc.issocket ()); out: syscall_printf ("%d = fhandler_disk_file::open (%s, %p)", res, get_win32_name (), flags); return res; } int fhandler_disk_file::close () { return close_fs (); } int fhandler_base::close_fs () { int res = fhandler_base::close (); if (!res) user_shared->delqueue.process_queue (); 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; } DIR * fhandler_disk_file::opendir () { DIR *dir; DIR *res = NULL; size_t len; 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 (access_worker (pc, 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->set_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; if (pc.isencoded ()) set_encoded (); } 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; } struct dirent * fhandler_disk_file::readdir (DIR *dir) { WIN32_FIND_DATA buf; HANDLE handle; struct dirent *res = NULL; 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)) { seterrno_from_win_error (__FILE__, __LINE__, lasterr); return res; } } else if (dir->__handle == INVALID_HANDLE_VALUE) return res; else if (!FindNextFileA (dir->__handle, &buf)) { DWORD lasterr = GetLastError (); (void) FindClose (dir->__handle); dir->__handle = INVALID_HANDLE_VALUE; /* POSIX says you shouldn't set errno when readdir can't find any more files; so, if another error we leave it set. */ if (lasterr != ERROR_NO_MORE_FILES) seterrno_from_win_error (__FILE__, __LINE__, lasterr); syscall_printf ("%p = readdir (%p)", res, dir); return res; } /* 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 + 1]; 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 (get_encoded ()) (void) fnunmunge (dir->__d_dirent->d_name, buf.cFileName); else strcpy (dir->__d_dirent->d_name, buf.cFileName); dir->__d_position++; res = dir->__d_dirent; syscall_printf ("%p = readdir (%p) (%s)", &dir->__d_dirent, dir, buf.cFileName); 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) { (void) 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 != 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) { if (!iscygdrive_root ()) return fhandler_disk_file::fstat (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 && iscygdrive_root () && !ndrives) set_drives (); return dir; } struct dirent * fhandler_cygdrive::readdir (DIR *dir) { if (!iscygdrive_root ()) return fhandler_disk_file::readdir (dir); if (!pdrive || !*pdrive) return NULL; if (GetFileAttributes (pdrive) == INVALID_FILE_ATTRIBUTES) { pdrive = strchr (pdrive, '\0') + 1; return readdir (dir); } *dir->__d_dirent->d_name = cyg_tolower (*pdrive); dir->__d_dirent->d_name[1] = '\0'; dir->__d_position++; pdrive = strchr (pdrive, '\0') + 1; syscall_printf ("%p = readdir (%p) (%s)", &dir->__d_dirent, dir, dir->__d_dirent->d_name); return dir->__d_dirent; } _off64_t fhandler_cygdrive::telldir (DIR *dir) { return fhandler_disk_file::telldir (dir); } void fhandler_cygdrive::seekdir (DIR *dir, _off64_t loc) { if (!iscygdrive_root ()) return fhandler_disk_file::seekdir (dir, loc); for (pdrive = get_win32_name (), dir->__d_position = -1; *pdrive; pdrive = strchr (pdrive, '\0') + 1) if (++dir->__d_position >= loc) break; return; } void fhandler_cygdrive::rewinddir (DIR *dir) { if (!iscygdrive_root ()) return fhandler_disk_file::rewinddir (dir); pdrive = get_win32_name (); dir->__d_position = 0; return; } int fhandler_cygdrive::closedir (DIR *dir) { if (!iscygdrive_root ()) return fhandler_disk_file::closedir (dir); pdrive = get_win32_name (); return -1; }