unit: add ConditionACPower=

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index 59d8544d053b9eca14e917e5c51c45ad5bb76603..3f00db7f2c2ed8fc521b892069827d1d0d28392f 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -5282,9 +5282,13 @@ int can_sleep(const char *type) {
 
         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)
@@ -5302,9 +5306,14 @@ int can_sleep_disk(const char *type) {
 
         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) {
@@ -5754,3 +5763,81 @@ char *strip_tab_ansi(char **ibuf, size_t *_isz) {
 
         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;
+}