+int audit_session_from_pid(pid_t pid, uint32_t *id) {
+ char *p, *s;
+ uint32_t u;
+ int r;
+
+ assert(pid >= 1);
+ assert(id);
+
+ if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
+ return -ENOENT;
+
+ if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0)
+ return -ENOMEM;
+
+ r = read_one_line_file(p, &s);
+ free(p);
+ if (r < 0)
+ return r;
+
+ r = safe_atou32(s, &u);
+ free(s);
+
+ if (r < 0)
+ return r;
+
+ if (u == (uint32_t) -1 || u <= 0)
+ return -ENOENT;
+
+ *id = u;
+ return 0;
+}
+
+bool display_is_local(const char *display) {
+ assert(display);
+
+ return
+ display[0] == ':' &&
+ display[1] >= '0' &&
+ display[1] <= '9';
+}
+
+int socket_from_display(const char *display, char **path) {
+ size_t k;
+ char *f, *c;
+
+ assert(display);
+ assert(path);
+
+ if (!display_is_local(display))
+ return -EINVAL;
+
+ k = strspn(display+1, "0123456789");
+
+ f = new(char, sizeof("/tmp/.X11-unix/X") + k);
+ if (!f)
+ return -ENOMEM;
+
+ c = stpcpy(f, "/tmp/.X11-unix/X");
+ memcpy(c, display+1, k);
+ c[k] = 0;
+
+ *path = f;
+
+ return 0;
+}
+