util-lib: make timestamp generation and parsing reversible (#3869)

[elogind.git] / src / basic / mount-util.c

diff --git a/src/basic/mount-util.c b/src/basic/mount-util.c
index d04a49e2fef7af05a0ee7c9c6230ef8ba3785ca9..121619eed08d844c11e19fbb59b3954f1a05493d 100644 (file)
--- a/src/basic/mount-util.c
+++ b/src/basic/mount-util.c
@@ -534,3 +534,28 @@ int repeat_unmount(const char *path, int flags) {
         }
 }
 #endif // 0
+
+const char* mode_to_inaccessible_node(mode_t mode) {
+        /* This function maps a node type to the correspondent inaccessible node type.
+         * Character and block inaccessible devices may not be created (because major=0 and minor=0),
+         * in such case we map character and block devices to the inaccessible node type socket. */
+        switch(mode & S_IFMT) {
+                case S_IFREG:
+                        return "/run/systemd/inaccessible/reg";
+                case S_IFDIR:
+                        return "/run/systemd/inaccessible/dir";
+                case S_IFCHR:
+                        if (access("/run/systemd/inaccessible/chr", F_OK) == 0)
+                                return "/run/systemd/inaccessible/chr";
+                        return "/run/systemd/inaccessible/sock";
+                case S_IFBLK:
+                        if (access("/run/systemd/inaccessible/blk", F_OK) == 0)
+                                return "/run/systemd/inaccessible/blk";
+                        return "/run/systemd/inaccessible/sock";
+                case S_IFIFO:
+                        return "/run/systemd/inaccessible/fifo";
+                case S_IFSOCK:
+                        return "/run/systemd/inaccessible/sock";
+        }
+        return NULL;
+}