2 This file is part of systemd.
4 Copyright 2010-2012 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/types.h>
25 #include <linux/magic.h>
26 #include <sys/statvfs.h>
29 #include "dirent-util.h"
33 #include "stat-util.h"
34 #include "string-util.h"
36 #if 0 /// UNNEEDED by elogind
37 int is_symlink(const char *path) {
42 if (lstat(path, &info) < 0)
45 return !!S_ISLNK(info.st_mode);
49 int is_dir(const char* path, bool follow) {
62 return !!S_ISDIR(st.st_mode);
65 #if 0 /// UNNEEDED by elogind
66 int is_device_node(const char *path) {
71 if (lstat(path, &info) < 0)
74 return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode));
77 int dir_is_empty(const char *path) {
78 _cleanup_closedir_ DIR *d;
85 FOREACH_DIRENT(de, d, return -errno)
92 bool null_or_empty(struct stat *st) {
95 if (S_ISREG(st->st_mode) && st->st_size <= 0)
98 /* We don't want to hardcode the major/minor of /dev/null,
99 * hence we do a simpler "is this a device node?" check. */
101 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
107 int null_or_empty_path(const char *fn) {
112 if (stat(fn, &st) < 0)
115 return null_or_empty(&st);
118 #if 0 /// UNNEEDED by elogind
119 int null_or_empty_fd(int fd) {
124 if (fstat(fd, &st) < 0)
127 return null_or_empty(&st);
131 int path_is_read_only_fs(const char *path) {
136 if (statvfs(path, &st) < 0)
139 if (st.f_flag & ST_RDONLY)
142 /* On NFS, statvfs() might not reflect whether we can actually
143 * write to the remote share. Let's try again with
144 * access(W_OK) which is more reliable, at least sometimes. */
145 if (access(path, W_OK) < 0 && errno == EROFS)
151 #if 0 /// UNNEEDED by elogind
152 int path_is_os_tree(const char *path) {
158 /* We use /usr/lib/os-release as flag file if something is an OS */
159 p = strjoina(path, "/usr/lib/os-release");
164 /* Also check for the old location in /etc, just in case. */
165 p = strjoina(path, "/etc/os-release");
172 int files_same(const char *filea, const char *fileb) {
178 if (stat(filea, &a) < 0)
181 if (stat(fileb, &b) < 0)
184 return a.st_dev == b.st_dev &&
185 a.st_ino == b.st_ino;
188 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
190 assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));
192 return F_TYPE_EQUAL(s->f_type, magic_value);
195 #if 0 /// UNNEEDED by elogind
196 int fd_check_fstype(int fd, statfs_f_type_t magic_value) {
199 if (fstatfs(fd, &s) < 0)
202 return is_fs_type(&s, magic_value);
205 int path_check_fstype(const char *path, statfs_f_type_t magic_value) {
206 _cleanup_close_ int fd = -1;
208 fd = open(path, O_RDONLY);
212 return fd_check_fstype(fd, magic_value);
216 bool is_temporary_fs(const struct statfs *s) {
217 return is_fs_type(s, TMPFS_MAGIC) ||
218 is_fs_type(s, RAMFS_MAGIC);
221 int fd_is_temporary_fs(int fd) {
224 if (fstatfs(fd, &s) < 0)
227 return is_temporary_fs(&s);