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udev-util: re-implement on_ac_power() with sd-device

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(cherry picked from commit 01d4ad3bde)
This commit is contained in:
Yu Watanabe 2022-01-05 08:29:00 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 435bd3077a
commit dbfaed242e
1 changed files with 40 additions and 35 deletions
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75
src/shared/udev-util.c
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@ -2,7 +2,6 @@
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/inotify.h>
#include <unistd.h>
@ -10,12 +9,10 @@
#include "device-nodes.h"
#include "device-private.h"
#include "device-util.h"
#include "dirent-util.h"
#include "env-file.h"
#include "errno-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
@ -584,60 +581,68 @@ int udev_queue_init(void) {
}
int on_ac_power(void) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
bool found_offline = false, found_online = false;
_cleanup_closedir_ DIR *d = NULL;
sd_device *d;
int r;
d = opendir("/sys/class/power_supply");
if (!d)
return errno == ENOENT ? true : -errno;
r = sd_device_enumerator_new(&e);
if (r < 0)
return r;
FOREACH_DIRENT(de, d, return -errno) {
_cleanup_close_ int device_fd = -1;
_cleanup_free_ char *contents = NULL;
r = sd_device_enumerator_allow_uninitialized(e);
if (r < 0)
return r;
r = sd_device_enumerator_add_match_subsystem(e, "power_supply", true);
if (r < 0)
return r;
FOREACH_DEVICE(e, d) {
const char *val;
unsigned v;
device_fd = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC);
if (device_fd < 0) {
if (IN_SET(errno, ENOENT, ENOTDIR))
continue;
return -errno;
}
r = read_virtual_file_at(device_fd, "type", SIZE_MAX, &contents, NULL);
if (r == -ENOENT)
r = sd_device_get_sysattr_value(d, "type", &val);
if (r < 0) {
log_device_debug_errno(d, r, "Failed to read 'type' sysfs attribute, ignoring: %m");
continue;
if (r < 0)
return r;
delete_trailing_chars(contents, NEWLINE);
}
/* We assume every power source is AC, except for batteries. See
* https://github.com/torvalds/linux/blob/4eef766b7d4d88f0b984781bc1bcb574a6eafdc7/include/linux/power_supply.h#L176
* for defined power source types. Also see:
* https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power */
if (streq(contents, "Battery"))
if (streq(val, "Battery")) {
log_device_debug(d, "The power supply is battery, ignoring.");
continue;
}
contents = mfree(contents);
r = read_virtual_file_at(device_fd, "online", SIZE_MAX, &contents, NULL);
if (r == -ENOENT)
r = sd_device_get_sysattr_value(d, "online", &val);
if (r < 0) {
log_device_debug_errno(d, r, "Failed to read 'online' sysfs attribute, ignoring: %m");
continue;
if (r < 0)
return r;
}
delete_trailing_chars(contents, NEWLINE);
r = safe_atou(val, &v);
if (r < 0) {
log_device_debug_errno(d, r, "Failed to parse 'online' attribute, ignoring: %m");
continue;
}
r = safe_atou(contents, &v);
if (r < 0)
return r;
if (v > 0) /* At least 1 and 2 are defined as different types of 'online' */
found_online = true;
else
found_offline = true;
log_device_debug(d, "The power supply is currently %s.", v > 0 ? "online" : "offline");
}
if (found_online)
log_debug("Found at least one online non-battery power supply, system is running on AC power.");
else if (!found_offline)
log_debug("Found no offline non-battery power supply, assuming system is running on AC power.");
else
log_debug("All non-battery power supplies are offline, assuming system is running with battery.");
return found_online || !found_offline;
}