#if !defined(lint) && !defined(LINT)
static const char rcsid[] =
"$FreeBSD: src/usr.sbin/cron/cron/cron.c,v 1.18 2006/07/20 09:11:08 stefanf Exp $";
#endif
#define MAIN_PROGRAM
#include "cron.h"
#include <sys/signal.h>
#if SYS_TIME_H
# include <sys/time.h>
#else
# include <time.h>
#endif
static void usage __P((void)),
run_reboot_jobs __P((cron_db *)),
cron_tick __P((cron_db *)),
cron_sync __P((void)),
cron_sleep __P((cron_db *)),
cron_clean __P((cron_db *)),
#ifdef USE_SIGCHLD
sigchld_handler __P((int)),
#endif
sighup_handler __P((int)),
parse_args __P((int c, char *v[]));
static time_t last_time = 0;
static int dst_enabled = 0;
struct pidfh *pfh;
static void
usage() {
char **dflags;
#ifdef __APPLE__
fprintf(stderr, "usage: cron "
#else
fprintf(stderr, "usage: cron [-j jitter] [-J rootjitter] "
#endif
"[-s] [-o] [-x debugflag[,...]]\n");
fprintf(stderr, "\ndebugflags: ");
for(dflags = DebugFlagNames; *dflags; dflags++) {
fprintf(stderr, "%s ", *dflags);
}
fprintf(stderr, "\n");
exit(ERROR_EXIT);
}
static void
open_pidfile(void)
{
char pidfile[MAX_FNAME];
char buf[MAX_TEMPSTR];
int otherpid;
(void) snprintf(pidfile, sizeof(pidfile), PIDFILE, PIDDIR);
pfh = pidfile_open(pidfile, 0600, &otherpid);
if (pfh == NULL) {
if (errno == EEXIST) {
snprintf(buf, sizeof(buf),
"cron already running, pid: %d", otherpid);
} else {
snprintf(buf, sizeof(buf),
"can't open or create %s: %s", pidfile,
strerror(errno));
}
log_it("CRON", getpid(), "DEATH", buf);
errx(ERROR_EXIT, "%s", buf);
}
}
int
main(argc, argv)
int argc;
char *argv[];
{
cron_db database;
ProgramName = argv[0];
#if defined(BSD)
setlinebuf(stdout);
setlinebuf(stderr);
#endif
parse_args(argc, argv);
#ifdef USE_SIGCHLD
(void) signal(SIGCHLD, sigchld_handler);
#else
(void) signal(SIGCLD, SIG_IGN);
#endif
(void) signal(SIGHUP, sighup_handler);
open_pidfile();
set_cron_uid();
set_cron_cwd();
#if defined(POSIX)
setenv("PATH", _PATH_DEFPATH, 1);
#endif
# if DEBUGGING
if (DebugFlags) {
# else
if (0) {
# endif
(void) fprintf(stderr, "[%d] cron started\n", getpid());
} else {
#ifdef __APPLE__
if (getppid() != 1 && daemon(1, 0) == -1) {
#else
if (daemon(1, 0) == -1) {
#endif
pidfile_remove(pfh);
log_it("CRON",getpid(),"DEATH","can't become daemon");
exit(0);
}
}
pidfile_write(pfh);
database.head = NULL;
database.tail = NULL;
database.mtime = (time_t) 0;
load_database(&database);
run_reboot_jobs(&database);
cron_sync();
while (TRUE) {
# if DEBUGGING
# endif
cron_sleep(&database);
load_database(&database);
cron_tick(&database);
TargetTime += 60;
}
}
static void
run_reboot_jobs(db)
cron_db *db;
{
register user *u;
register entry *e;
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
if (e->flags & WHEN_REBOOT) {
job_add(e, u);
}
}
}
(void) job_runqueue();
}
static void
cron_tick(db)
cron_db *db;
{
static struct tm lasttm;
static time_t diff = 0,
difflimit = 0;
struct tm otztm;
#ifdef __APPLE__
int otzminute = 0;
int otzhour = 0;
int otzdom = 0;
int otzmonth = 0;
int otzdow = 0;
#else
int otzminute, otzhour, otzdom, otzmonth, otzdow;
#endif
register struct tm *tm = localtime(&TargetTime);
register int minute, hour, dom, month, dow;
register user *u;
register entry *e;
minute = tm->tm_min -FIRST_MINUTE;
hour = tm->tm_hour -FIRST_HOUR;
dom = tm->tm_mday -FIRST_DOM;
month = tm->tm_mon +1 -FIRST_MONTH;
dow = tm->tm_wday -FIRST_DOW;
Debug(DSCH, ("[%d] tick(%d,%d,%d,%d,%d)\n",
getpid(), minute, hour, dom, month, dow))
if (dst_enabled && last_time != 0
&& TargetTime > last_time
&& tm->tm_gmtoff != lasttm.tm_gmtoff ) {
diff = tm->tm_gmtoff - lasttm.tm_gmtoff;
if ( diff > 0 ) {
difflimit = TargetTime + diff;
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
e->flags &= ~NOT_UNTIL;
if ( e->lastrun >= TargetTime )
e->lastrun = 0;
if ( e->lastrun < TargetTime - 3600 )
e->flags |= RUN_AT;
else
e->flags &= ~RUN_AT;
}
}
} else {
difflimit = TargetTime - diff;
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
e->flags |= NOT_UNTIL;
e->flags &= ~RUN_AT;
}
}
}
}
if (diff != 0) {
if (last_time == 0 || TargetTime >= difflimit) {
diff = 0;
difflimit = 0;
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
e->flags &= ~(RUN_AT|NOT_UNTIL);
}
}
} else {
time_t difftime = TargetTime + tm->tm_gmtoff - diff;
gmtime_r(&difftime, &otztm);
otzminute = otztm.tm_min -FIRST_MINUTE;
otzhour = otztm.tm_hour -FIRST_HOUR;
otzdom = otztm.tm_mday -FIRST_DOM;
otzmonth = otztm.tm_mon +1 -FIRST_MONTH;
otzdow = otztm.tm_wday -FIRST_DOW;
}
}
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
#ifdef __APPLE__
Debug(DSCH|DEXT, ("user [%s:%s:%s:...] cmd=\"%s\"\n",
env_get("LOGNAME", e->envp),
e->uname, e->gname, e->cmd))
#else
Debug(DSCH|DEXT, ("user [%s:%d:%d:...] cmd=\"%s\"\n",
env_get("LOGNAME", e->envp),
e->uid, e->gid, e->cmd))
#endif
if ( diff != 0 && (e->flags & (RUN_AT|NOT_UNTIL)) ) {
if (bit_test(e->minute, otzminute)
&& bit_test(e->hour, otzhour)
&& bit_test(e->month, otzmonth)
&& ( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR))
? (bit_test(e->dow,otzdow) && bit_test(e->dom,otzdom))
: (bit_test(e->dow,otzdow) || bit_test(e->dom,otzdom))
)
) {
if ( e->flags & RUN_AT ) {
e->flags &= ~RUN_AT;
e->lastrun = TargetTime;
job_add(e, u);
continue;
} else
e->flags &= ~NOT_UNTIL;
} else if ( e->flags & NOT_UNTIL )
continue;
}
if (bit_test(e->minute, minute)
&& bit_test(e->hour, hour)
&& bit_test(e->month, month)
&& ( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR))
? (bit_test(e->dow,dow) && bit_test(e->dom,dom))
: (bit_test(e->dow,dow) || bit_test(e->dom,dom))
)
) {
e->flags &= ~RUN_AT;
e->lastrun = TargetTime;
job_add(e, u);
}
}
}
last_time = TargetTime;
lasttm = *tm;
}
static void
cron_sync() {
register struct tm *tm;
TargetTime = time((time_t*)0);
tm = localtime(&TargetTime);
TargetTime += (60 - tm->tm_sec);
}
static void
cron_sleep(db)
cron_db *db;
{
int seconds_to_wait = 0;
for (;;) {
seconds_to_wait = (int) (TargetTime - time((time_t*)0));
if (seconds_to_wait < -600 || seconds_to_wait > 600) {
cron_clean(db);
cron_sync();
continue;
}
Debug(DSCH, ("[%d] TargetTime=%ld, sec-to-wait=%d\n",
getpid(), (long)TargetTime, seconds_to_wait))
if (seconds_to_wait <= 0)
break;
if (job_runqueue() == 0) {
Debug(DSCH, ("[%d] sleeping for %d seconds\n",
getpid(), seconds_to_wait))
sleep(seconds_to_wait);
}
}
}
static void
cron_clean(db)
cron_db *db;
{
user *u;
entry *e;
last_time = 0;
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
e->flags &= ~(RUN_AT|NOT_UNTIL);
}
}
}
#ifdef USE_SIGCHLD
static void
sigchld_handler(int x)
{
WAIT_T waiter;
PID_T pid;
#ifdef __APPLE__
x = x; #endif
for (;;) {
#ifdef POSIX
pid = waitpid(-1, &waiter, WNOHANG);
#else
pid = wait3(&waiter, WNOHANG, (struct rusage *)0);
#endif
switch (pid) {
case -1:
Debug(DPROC,
("[%d] sigchld...no children\n", getpid()))
return;
case 0:
Debug(DPROC,
("[%d] sigchld...no dead kids\n", getpid()))
return;
default:
Debug(DPROC,
("[%d] sigchld...pid #%d died, stat=%d\n",
getpid(), pid, WEXITSTATUS(waiter)))
}
}
}
#endif
static void
sighup_handler(int x)
{
#ifdef __APPLE__
x = x; #endif
log_close();
}
static void
parse_args(argc, argv)
int argc;
char *argv[];
{
int argch;
#ifndef __APPLE__
char *endp;
#endif
#ifdef __APPLE__
while ((argch = getopt(argc, argv, "osx:")) != -1) {
switch (argch) {
#else
while ((argch = getopt(argc, argv, "j:J:osx:")) != -1) {
switch (argch) {
case 'j':
Jitter = strtoul(optarg, &endp, 10);
if (*optarg == '\0' || *endp != '\0' || Jitter > 60)
errx(ERROR_EXIT,
"bad value for jitter: %s", optarg);
break;
case 'J':
RootJitter = strtoul(optarg, &endp, 10);
if (*optarg == '\0' || *endp != '\0' || RootJitter > 60)
errx(ERROR_EXIT,
"bad value for root jitter: %s", optarg);
break;
#endif
case 'o':
dst_enabled = 0;
break;
case 's':
dst_enabled = 1;
break;
case 'x':
if (!set_debug_flags(optarg))
usage();
break;
default:
usage();
}
}
}