X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=49b58444c7213da9a96f7cbe9afffb3410babeeb;hb=d5a89d7dc17a5ba5cf4fc71f82963c5c94a31c3d;hp=d01c2061b423c6b60a4dc422a1d358e46eb5dad5;hpb=23406ce58aa7142e8df3c5c9e5ac34a01e90e3e0;p=elogind.git

diff --git a/src/shared/util.c b/src/shared/util.c
index d01c2061b..49b58444c 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -2851,6 +2851,9 @@ int get_ctty_devnr(pid_t pid, dev_t *d) {
                    &ttynr) != 1)
                 return -EIO;
 
+        if (major(ttynr) == 0 && minor(ttynr) == 0)
+                return -ENOENT;
+
         *d = (dev_t) ttynr;
         return 0;
 }
@@ -5279,9 +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)
@@ -5299,9 +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) {
@@ -5670,7 +5682,7 @@ oom:
 }
 
 char *strip_tab_ansi(char **ibuf, size_t *_isz) {
-        const char *i, *begin;
+        const char *i, *begin = NULL;
         enum {
                 STATE_OTHER,
                 STATE_ESCAPE,
@@ -5751,3 +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;
+}