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plugins: sys: use counting semaphores to handle >1 AC supply

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- Track number of ac and ac online
 - Use systemd logic to assert sys/pwr/ac also when no supply

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2021-05-13 08:45:49 +02:00
parent 6f82b806ad
commit c27f3603e6
1 changed files with 40 additions and 9 deletions
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plugins/sys.c
+40 -9
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@@ -36,21 +36,28 @@
#define _PATH_SYSFS_PWR "/sys/class/power_supply"
static struct iwatch iw_sys;
static int num_ac_online;
static int num_ac;
static void check_online(char *path, int clear)
static void sys_cond(int set)
{
char cond[MAX_COND_LEN] = COND_SYS;
strlcat(cond, "pwr/ac", sizeof(cond));
if (set)
cond_set_oneshot(cond);
else
cond_clear(cond);
}
static int check_online(char *path)
{
int val;
if (fngetint(path, &val))
return;
return 0;
strlcat(cond, "pwr/ac", sizeof(cond));
if (val)
cond_set_oneshot(cond);
else if (clear)
cond_clear(cond);
return val;
}
static void sys_callback(void *arg, int fd, int events)
@@ -86,7 +93,19 @@ static void sys_callback(void *arg, int fd, int events)
if (!iwp)
continue;
check_online(iwp->path, 1);
if (check_online(iwp->path)) {
if (!num_ac_online)
sys_cond(1);
if (num_ac_online < num_ac)
num_ac_online++;
} else {
if (num_ac_online > 0)
num_ac_online--;
if (!num_ac_online)
sys_cond(0);
}
}
}
@@ -122,6 +141,13 @@ static int is_ac(char *path, size_t len)
return 0;
}
/*
* Called when base filesystem is up, modules have been probed,
* or insmodded from /etc/finit.conf, so by now we should have
* /sys/class/power_supply/ available for probing. If none is
* found we assert /sys/pwr/ac condition anyway, this is what
* systemd does (ConditionACPower) and also makes most sense.
*/
static void sys_init(void *arg)
{
struct dirent **d = NULL;
@@ -147,7 +173,8 @@ static void sys_init(void *arg)
num_ac++;
snprintf(path, sizeof(path), "%s/%s/online", _PATH_SYSFS_PWR, nm);
check_online(path, 0);
if (check_online(path))
num_ac_online++;
if (iwatch_add(&iw_sys, path, 0))
_pe("Failed setting up pwr monitor for %s", path);
@@ -155,6 +182,10 @@ static void sys_init(void *arg)
free(d[i]);
}
free(d);
/* if any power_supply is online, or none can be found */
if (num_ac == 0 || num_ac_online > 0)
sys_cond(1);
}
static plugin_t plugin = {