1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010-2012 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <linux/magic.h>
24 #include <sys/statvfs.h>
27 #include "dirent-util.h"
31 #include "stat-util.h"
32 #include "string-util.h"
34 /// UNNEEDED by elogind
36 int is_symlink(const char *path) {
41 if (lstat(path, &info) < 0)
44 return !!S_ISLNK(info.st_mode);
48 int is_dir(const char* path, bool follow) {
61 return !!S_ISDIR(st.st_mode);
64 /// 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 /// UNNEEDED by elogind
120 int null_or_empty_fd(int fd) {
125 if (fstat(fd, &st) < 0)
128 return null_or_empty(&st);
132 int path_is_read_only_fs(const char *path) {
137 if (statvfs(path, &st) < 0)
140 if (st.f_flag & ST_RDONLY)
143 /* On NFS, statvfs() might not reflect whether we can actually
144 * write to the remote share. Let's try again with
145 * access(W_OK) which is more reliable, at least sometimes. */
146 if (access(path, W_OK) < 0 && errno == EROFS)
152 /// UNNEEDED by elogind
154 int path_is_os_tree(const char *path) {
160 /* We use /usr/lib/os-release as flag file if something is an OS */
161 p = strjoina(path, "/usr/lib/os-release");
166 /* Also check for the old location in /etc, just in case. */
167 p = strjoina(path, "/etc/os-release");
174 int files_same(const char *filea, const char *fileb) {
180 if (stat(filea, &a) < 0)
183 if (stat(fileb, &b) < 0)
186 return a.st_dev == b.st_dev &&
187 a.st_ino == b.st_ino;
190 bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
192 assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));
194 return F_TYPE_EQUAL(s->f_type, magic_value);
197 /// UNNEEDED by elogind
199 int fd_check_fstype(int fd, statfs_f_type_t magic_value) {
202 if (fstatfs(fd, &s) < 0)
205 return is_fs_type(&s, magic_value);
208 int path_check_fstype(const char *path, statfs_f_type_t magic_value) {
209 _cleanup_close_ int fd = -1;
211 fd = open(path, O_RDONLY);
215 return fd_check_fstype(fd, magic_value);
219 bool is_temporary_fs(const struct statfs *s) {
220 return is_fs_type(s, TMPFS_MAGIC) ||
221 is_fs_type(s, RAMFS_MAGIC);
224 int fd_is_temporary_fs(int fd) {
227 if (fstatfs(fd, &s) < 0)
230 return is_temporary_fs(&s);