external/gpl2/lvm2/dist/lib/misc/lvm-file.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef _LVM_FILE_H
  19 #define _LVM_FILE_H
  20
  21 /*
  22  * Create a temporary filename, and opens a descriptor to the file.
  23  */
  24 int create_temp_name(const char *dir, char *buffer, size_t len, int *fd,
  25                      unsigned *seed);
  26
  27 /*
  28  * NFS-safe rename of a temporary file to a common name, designed
  29  * to avoid race conditions and not overwrite the destination if
  30  * it exists.
  31  */
  32 int lvm_rename(const char *old, const char *new);
  33
  34 /*
  35  * Return 1 if path exists else return 0
  36  */
  37 int path_exists(const char *path);
  38 int dir_exists(const char *path);
  39
  40 /*
  41  * Return 1 if dir is empty
  42  */
  43 int is_empty_dir(const char *dir);
  44
  45 /* Sync directory changes */
  46 void sync_dir(const char *file);
  47
  48 /* fcntl locking wrappers */
  49 int fcntl_lock_file(const char *file, short lock_type, int warn_if_read_only);
  50 void fcntl_unlock_file(int lockfd);
  51
  52 #define is_same_inode(buf1, buf2) \
  53   ((buf1).st_ino == (buf2).st_ino && \
  54    (buf1).st_dev == (buf2).st_dev)
  55
  56 /*
  57  * Close the specified stream, taking care to detect and diagnose any write
  58  * error.  If there is an error, use the supplied file name in a diagnostic
  59  * that is reported via log_error or log_sys_error, as appropriate.
  60  * Use this function to close a stream when you've written data to it via
  61  * unchecked fprintf, fputc, etc. calls.  Return 0 on success, EOF on failure.
  62  */
  63 int lvm_fclose(FILE *fp, const char *filename);
  64
  65 #endif