| /* |
| can_clone_file.c -- does the current filesystem support cloning |
| Copyright (C) 1999-2017 Dieter Baron and Thomas Klausner |
| |
| This file is part of libzip, a library to manipulate ZIP archives. |
| The authors can be contacted at <libzip@nih.at> |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in |
| the documentation and/or other materials provided with the |
| distribution. |
| 3. The names of the authors may not be used to endorse or promote |
| products derived from this software without specific prior |
| written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS |
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
| IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "config.h" |
| |
| #ifdef HAVE_CLONEFILE |
| #include <sys/attr.h> |
| #include <sys/param.h> |
| #include <sys/mount.h> |
| #include <unistd.h> |
| #endif |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| #ifdef HAVE_CLONEFILE |
| struct statfs fs; |
| struct attrlist attribute_list; |
| struct { |
| uint32_t size; |
| vol_capabilities_attr_t capabilities; |
| } volume_attributes; |
| |
| if (statfs(".", &fs) < 0) { |
| fprintf(stderr, "%s: can't get mount point of current directory: %s\n", argv[0], strerror(errno)); |
| exit(1); |
| } |
| |
| /* Not all volumes support clonefile(). A volume can be tested for |
| clonefile() support by using getattrlist(2) to get the volume |
| capabilities attribute ATTR_VOL_CAPABILITIES, and then testing the |
| VOL_CAP_INT_CLONE flag. */ |
| |
| memset(&attribute_list, 0, sizeof(attribute_list)); |
| attribute_list.bitmapcount = ATTR_BIT_MAP_COUNT; |
| attribute_list.volattr = ATTR_VOL_INFO|ATTR_VOL_CAPABILITIES; |
| memset(&volume_attributes, 0, sizeof(volume_attributes)); |
| |
| if (getattrlist(fs.f_mntonname, &attribute_list, &volume_attributes, sizeof(volume_attributes), 0) < 0) { |
| fprintf(stderr, "%s: can't get volume capabilities of '%s': %s\n", argv[0], fs.f_mntonname, strerror(errno)); |
| exit(1); |
| } |
| |
| if (volume_attributes.capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_CLONE) { |
| exit(0); |
| } |
| #endif |
| |
| exit(1); |
| } |