&ttynr) != 1)
return -EIO;
+ if (major(ttynr) == 0 && minor(ttynr) == 0)
+ return -ENOENT;
+
*d = (dev_t) ttynr;
return 0;
}
snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
char_array_0(fn);
- if ((k = readlink_malloc(fn, &s)) < 0) {
+ k = readlink_malloc(fn, &s);
+ if (k < 0) {
if (k != -ENOENT)
return k;
* symlink in /dev/char. Let's return something
* vaguely useful. */
- if (!(b = strdup(fn + 5)))
+ b = strdup(fn + 5);
+ if (!b)
return -ENOMEM;
*r = b;
assert(type);
+ /* If /sys is read-only we cannot sleep */
+ if (access("/sys/power/state", W_OK) < 0)
+ return false;
+
r = read_one_line_file("/sys/power/state", &p);
if (r < 0)
- return r == -ENOENT ? 0 : r;
+ return false;
k = strlen(type);
FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state)
assert(type);
+ /* If /sys is read-only we cannot sleep */
+ if (access("/sys/power/state", W_OK) < 0 ||
+ access("/sys/power/disk", W_OK) < 0)
+ return false;
+
r = read_one_line_file("/sys/power/disk", &p);
if (r < 0)
- return r == -ENOENT ? 0 : r;
+ return false;
k = strlen(type);
FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) {
}
char *strip_tab_ansi(char **ibuf, size_t *_isz) {
- const char *i, *begin;
+ const char *i, *begin = NULL;
enum {
STATE_OTHER,
STATE_ESCAPE,
return obuf;
}
+
+int on_ac_power(void) {
+ bool found_offline = false, found_online = false;
+ _cleanup_closedir_ DIR *d = NULL;
+
+ d = opendir("/sys/class/power_supply");
+ if (!d)
+ return -errno;
+
+ for (;;) {
+ struct dirent *de;
+ union dirent_storage buf;
+ _cleanup_free_ char *p = NULL;
+ _cleanup_close_ int fd = -1, device = -1;
+ char contents[6];
+ ssize_t n;
+ int k;
+
+ k = readdir_r(d, &buf.de, &de);
+ if (k != 0)
+ return -k;
+
+ if (!de)
+ break;
+
+ if (ignore_file(de->d_name))
+ continue;
+
+ device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (device < 0) {
+ if (errno == ENOENT || errno == ENOTDIR)
+ continue;
+
+ return -errno;
+ }
+
+ fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ continue;
+
+ return -errno;
+ }
+
+ n = read(fd, contents, sizeof(contents));
+ if (n < 0)
+ return -errno;
+
+ if (n != 6 || memcmp(contents, "Mains\n", 6))
+ continue;
+
+ close_nointr_nofail(fd);
+ fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0) {
+ if (errno == ENOENT)
+ continue;
+
+ return -errno;
+ }
+
+ n = read(fd, contents, sizeof(contents));
+ if (n < 0)
+ return -errno;
+
+ if (n != 2 || contents[1] != '\n')
+ return -EIO;
+
+ if (contents[0] == '1') {
+ found_online = true;
+ break;
+ } else if (contents[0] == '0')
+ found_offline = true;
+ else
+ return -EIO;
+ }
+
+ return found_online || !found_offline;
+}