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/* SPDX-License-Identifier: ISC */
#include "init.h"
/* service configurations */
static service_list_t cfg;
/* service run time data, sorted by target and topological order */
static svc_run_data_t *rt_data = NULL;
static size_t rt_count = 0;
/* maps a target to range in rt_data */
static size_t queue_start[TGT_MAX];
static size_t queue_count[TGT_MAX];
/* current state */
static size_t queue_idx = 0;
static int target = TGT_BOOT;
static size_t singleshot = 0;
static bool waiting = false;
/*****************************************************************************/
static const char *status_str[] = {
[STATE_OFF] = NULL,
[STATE_QUEUED] = NULL,
[STATE_RUNNING] ="\033[22;33m UP \033[0m",
[STATE_COMPLETED] = "\033[22;32mDONE\033[0m",
[STATE_FAILED] ="\033[22;31mFAIL\033[0m",
};
static void print_status(const char *msg, int type)
{
printf("[%s] %s\n", status_str[type], msg);
fflush(stdout);
}
static void respawn(svc_run_data_t *rt)
{
if (rt->svc->rspwn_limit > 0) {
rt->rspwn_count += 1;
if (rt->rspwn_count >= rt->svc->rspwn_limit)
goto fail;
}
rt->pid = runsvc(rt->svc);
if (rt->pid == -1)
goto fail;
rt->state = STATE_RUNNING;
return;
fail:
rt->state = STATE_FAILED;
print_status(rt->svc->desc, rt->state);
return;
}
static void check_target_completion(void)
{
if (singleshot > 0 || queue_idx < queue_count[target] || waiting)
return;
switch (target) {
case TGT_BOOT:
break;
case TGT_SHUTDOWN:
for (;;)
reboot(RB_POWER_OFF);
break;
case TGT_REBOOT:
for (;;)
reboot(RB_AUTOBOOT);
break;
}
}
void supervisor_handle_exited(pid_t pid, int status)
{
svc_run_data_t *rt;
service_t *svc;
size_t i;
for (i = 0; i < rt_count; ++i) {
if (rt_data[i].pid == pid)
break;
}
if (i >= rt_count)
return;
rt = rt_data + i;
svc = rt->svc;
rt->status = status;
rt->pid = -1;
if (svc->type == SVC_RESPAWN) {
if (target != TGT_REBOOT && target != TGT_SHUTDOWN)
respawn(rt);
} else {
if (rt->status == EXIT_SUCCESS) {
rt->state = STATE_COMPLETED;
} else {
rt->state = STATE_FAILED;
}
print_status(svc->desc, rt->state);
if (svc->type == SVC_ONCE) {
singleshot -= 1;
} else if (svc->type == SVC_WAIT) {
waiting = false;
}
check_target_completion();
}
}
void supervisor_set_target(int next)
{
if (target == TGT_REBOOT || target == TGT_SHUTDOWN || next == target)
return;
if (queue_idx < queue_count[target]) {
if (next != TGT_REBOOT && next != TGT_SHUTDOWN)
return;
}
target = next;
queue_idx = 0;
}
void supervisor_init(void)
{
int status = STATE_FAILED;
service_t *it;
size_t i, j;
if (svcscan(SVCDIR, &cfg))
goto out;
/* allocate run time data */
rt_count = 0;
for (i = 0; i < TGT_MAX; ++i) {
for (it = cfg.targets[i]; it != NULL; it = it->next)
++rt_count;
}
rt_data = calloc(rt_count, sizeof(rt_data[0]));
if (rt_data == NULL) {
rt_count = 0;
goto out;
}
/* map runtime data to services */
j = 0;
for (i = 0; i < TGT_MAX; ++i) {
queue_start[i] = j;
for (it = cfg.targets[i]; it != NULL; it = it->next) {
rt_data[j].svc = it;
rt_data[j].state = STATE_OFF;
rt_data[j].pid = -1;
++j;
}
queue_count[i] = j - queue_start[i];
}
/* initialize state */
status = STATE_COMPLETED;
for (i = 0; i < queue_count[target]; ++i)
rt_data[queue_start[target] + i].state = STATE_QUEUED;
out:
print_status("reading configuration from " SVCDIR, status);
}
bool supervisor_process_queues(void)
{
sigset_t mask, old_mask;
svc_run_data_t *rt;
service_t *svc;
size_t count;
bool ret = false;
sigfillset(&mask);
sigprocmask(SIG_SETMASK, &mask, &old_mask);
if (waiting)
goto out_unblock;
count = queue_count[target];
if (queue_idx >= count)
goto out_unblock;
rt = rt_data + queue_start[target] + queue_idx++;
svc = rt->svc;
ret = true;
if (svc->flags & SVC_FLAG_HAS_EXEC) {
rt->pid = runsvc(rt->svc);
if (rt->pid == -1) {
rt->state = STATE_FAILED;
} else {
rt->state = STATE_RUNNING;
switch (svc->type) {
case SVC_WAIT:
waiting = true;
break;
case SVC_ONCE:
singleshot += 1;
break;
}
}
} else {
rt->status = EXIT_SUCCESS;
rt->state = STATE_COMPLETED;
}
print_status(svc->desc, rt->state);
check_target_completion();
out_unblock:
sigprocmask(SIG_SETMASK, &old_mask, NULL);
return ret;
}
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