std::string Process::readline() {
std::string result;
while (!readbufferedline(result))
{
ssize_t size = readchunk();
if (size == 0)
{
break;
}
}
return result;
}
int
main(int argc, char *argv[]) {
char *buf;
struct disk *disks, *dp;
int ch, ok;
long long minwait, nextwait;
struct sigaction sa;
long long counter;
int initial_debug;
const char *conf_file, *save_file;
conf_file = _PATH_CONF;
save_file = _PATH_SAVE;
debug = 0;
while ((ch = getopt(argc, argv, "df:o:")) != -1)
switch (ch) {
case 'd':
if (debug)
debug *= 2;
else
debug = 1;
break;
case 'f':
conf_file = optarg;
break;
case 'o':
save_file = optarg;
break;
default:
usage();
/* NOTREACHED */
}
argv += optind;
argc -= optind;
if (argc != 0)
usage();
initial_debug = debug;
openlog("diskcheckd", LOG_CONS|LOG_PID|(debug?LOG_PERROR:0),
LOG_DAEMON);
if (!debug && daemon(0, 0) < 0) {
syslog(LOG_NOTICE, "daemon() failure: %m");
exit(EXIT_FAILURE);
}
sa.sa_handler = sigterm;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sa.sa_handler = sighup;
sigaction(SIGHUP, &sa, NULL);
/* Read the configuration file and the saved offsets */
disks = readconf(conf_file);
readoffsets(disks, save_file);
if ((buf = malloc(READ_SIZE)) == NULL) {
syslog(LOG_NOTICE, "malloc failure: %m");
exit(EXIT_FAILURE);
}
/* The main disk checking loop.
*
* We wait the shortest amount of time we need to before
* another disk is due for a read -- this time is updated
* in the 'nextwait' variable, which is then copied to
* 'minwait'. After a sleep, 'minwait' is subtracted from
* each disk's 'next' field, and when that reaches zero,
* that disk is read again.
*/
counter = 0LL;
minwait = 0LL;
while (!got_sigterm) {
ok = 0;
nextwait = LLONG_MAX;
for (dp = disks; dp->device != NULL; dp++)
if (dp->fd != -1) {
if (debug > 1)
fprintf(stderr,
"%s: next(%qd) -= %qd\n",
dp->device, dp->next, minwait);
if ((dp->next -= minwait) == 0) {
ok = 1;
readchunk(dp, buf);
}
/* XXX debugging */
if (dp->next < 0LL) {
syslog(LOG_NOTICE,
"dp->next < 0 for %s", dp->device);
abort();
}
if (dp->next < nextwait)
nextwait = dp->next;
}
if (!ok) {
syslog(LOG_EMERG, "all disks had read errors");
exit(EXIT_FAILURE);
}
/* 300 seconds => 5 minutes */
if (counter >= 300000000LL) {
if (debug)
fprintf(stderr, "counter rollover %qd => 0\n",
counter);
updateproctitle(disks);
writeoffsets(disks, save_file);
counter = 0LL;
}
minwait = nextwait;
if (debug > 1) {
--debug;
fprintf(stderr, "sleep %qd, counter %qd\n",
minwait, counter);
}
/*
* Handle whole seconds and usec separately to avoid overflow
* when calling usleep -- useconds_t is only 32 bits on at
* least some architectures, and minwait (being long long)
* may exceed INT_MAX.
*/
if (minwait > 1000000LL)
sleep((unsigned int)(minwait / 1000000));
if ((minwait % 1000000) > 0)
usleep((useconds_t)(minwait % 1000000));
counter += minwait;
if (got_sighup) {
/*
* Got a SIGHUP, so save the offsets, free the
* memory used for the disk structures, and then
* re-read the config file and the disk offsets.
*/
if (debug) {
fprintf(stderr, "got SIGHUP, counter == %qd\n",
counter);
debug = initial_debug;
}
writeoffsets(disks, save_file);
for (dp = disks; dp->device != NULL; dp++) {
free(dp->device);
close(dp->fd);
}
free(disks);
disks = readconf(conf_file);
readoffsets(disks, save_file);
minwait = 0LL;
got_sighup = 0;
}
}
if (debug)
fprintf(stderr, "got %s, counter == %qd\n",
got_sigterm==SIGTERM?"SIGTERM":"SIGINT", counter);
writeoffsets(disks, save_file);
return (EXIT_SUCCESS);
}
