+
+unsigned long personality_from_string(const char *p) {
+
+ /* Parse a personality specifier. We introduce our own
+ * identifiers that indicate specific ABIs, rather than just
+ * hints regarding the register size, since we want to keep
+ * things open for multiple locally supported ABIs for the
+ * same register size. We try to reuse the ABI identifiers
+ * used by libseccomp. */
+
+#if defined(__x86_64__)
+
+ if (streq(p, "x86"))
+ return PER_LINUX32;
+
+ if (streq(p, "x86-64"))
+ return PER_LINUX;
+
+#elif defined(__i386__)
+
+ if (streq(p, "x86"))
+ return PER_LINUX;
+#endif
+
+ /* personality(7) documents that 0xffffffffUL is used for
+ * querying the current personality, hence let's use that here
+ * as error indicator. */
+ return 0xffffffffUL;
+}
+
+const char* personality_to_string(unsigned long p) {
+
+#if defined(__x86_64__)
+
+ if (p == PER_LINUX32)
+ return "x86";
+
+ if (p == PER_LINUX)
+ return "x86-64";
+
+#elif defined(__i386__)
+
+ if (p == PER_LINUX)
+ return "x86";
+#endif
+
+ return NULL;
+}
+
+uint64_t physical_memory(void) {
+ long mem;
+
+ /* We return this as uint64_t in case we are running as 32bit
+ * process on a 64bit kernel with huge amounts of memory */
+
+ mem = sysconf(_SC_PHYS_PAGES);
+ assert(mem > 0);
+
+ return (uint64_t) mem * (uint64_t) page_size();
+}
+
+char* mount_test_option(const char *haystack, const char *needle) {
+
+ struct mntent me = {
+ .mnt_opts = (char*) haystack
+ };
+
+ assert(needle);
+
+ /* Like glibc's hasmntopt(), but works on a string, not a
+ * struct mntent */
+
+ if (!haystack)
+ return NULL;
+
+ return hasmntopt(&me, needle);
+}
+
+void hexdump(FILE *f, const void *p, size_t s) {
+ const uint8_t *b = p;
+ unsigned n = 0;
+
+ assert(s == 0 || b);
+
+ while (s > 0) {
+ size_t i;
+
+ fprintf(f, "%04x ", n);
+
+ for (i = 0; i < 16; i++) {
+
+ if (i >= s)
+ fputs(" ", f);
+ else
+ fprintf(f, "%02x ", b[i]);
+
+ if (i == 7)
+ fputc(' ', f);
+ }
+
+ fputc(' ', f);
+
+ for (i = 0; i < 16; i++) {
+
+ if (i >= s)
+ fputc(' ', f);
+ else
+ fputc(isprint(b[i]) ? (char) b[i] : '.', f);
+ }
+
+ fputc('\n', f);
+
+ if (s < 16)
+ break;
+
+ n += 16;
+ b += 16;
+ s -= 16;
+ }
+}
+
+int update_reboot_param_file(const char *param) {
+ int r = 0;
+
+ if (param) {
+
+ r = write_string_file(REBOOT_PARAM_FILE, param);
+ if (r < 0)
+ log_error("Failed to write reboot param to "
+ REBOOT_PARAM_FILE": %s", strerror(-r));
+ } else
+ unlink(REBOOT_PARAM_FILE);
+
+ return r;
+}
+
+int umount_recursive(const char *prefix, int flags) {
+ bool again;
+ int n = 0, r;
+
+ /* Try to umount everything recursively below a
+ * directory. Also, take care of stacked mounts, and keep
+ * unmounting them until they are gone. */
+
+ do {
+ _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
+
+ again = false;
+ r = 0;
+
+ proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
+ if (!proc_self_mountinfo)
+ return -errno;
+
+ for (;;) {
+ _cleanup_free_ char *path = NULL, *p = NULL;
+ int k;
+
+ k = fscanf(proc_self_mountinfo,
+ "%*s " /* (1) mount id */
+ "%*s " /* (2) parent id */
+ "%*s " /* (3) major:minor */
+ "%*s " /* (4) root */
+ "%ms " /* (5) mount point */
+ "%*s" /* (6) mount options */
+ "%*[^-]" /* (7) optional fields */
+ "- " /* (8) separator */
+ "%*s " /* (9) file system type */
+ "%*s" /* (10) mount source */
+ "%*s" /* (11) mount options 2 */
+ "%*[^\n]", /* some rubbish at the end */
+ &path);
+
+ if (k != 1) {
+ if (k == EOF)
+ break;
+
+ continue;
+ }
+
+ p = cunescape(path);
+ if (!p)
+ return -ENOMEM;
+
+ if (!path_startswith(p, prefix))
+ continue;
+
+ if (umount2(p, flags) < 0) {
+ r = -errno;
+ continue;
+ }
+
+ again = true;
+ n++;
+
+ break;
+ }
+
+ } while (again);
+
+ return r ? r : n;
+}