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/* Copyright 1988,1990,1993,1994 by Paul Vixie
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
*/
#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Id: cron.c,v 2.11 1994/01/15 20:43:43 vixie Exp $";
#endif
#define MAIN_PROGRAM
#include "cron.h"
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <libgen.h>
#include <strings.h>
static void usage __P((void)),
run_reboot_jobs __P((cron_db *)),
find_jobs __P((time_min, cron_db *, int, int)),
set_time __P((int)),
cron_sleep __P((time_min)),
#ifdef USE_SIGCHLD
sigchld_handler __P((int)),
#endif
sighup_handler __P((int)),
parse_args __P((int c, char *v[]));
static void
usage() {
#if DEBUGGING
char **dflags;
fprintf(stderr, "usage: %s [-x [", ProgramName);
for(dflags = DebugFlagNames; *dflags; dflags++)
fprintf(stderr, "%s%s", *dflags, dflags[1] ? "," : "]");
fprintf(stderr, "]\n");
#else
fprintf(stderr, "usage: %s\n", ProgramName);
#endif
exit(ERROR_EXIT);
}
int
main(argc, argv)
int argc;
char *argv[];
{
cron_db database;
char *cs;
ProgramName = basename(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);
/* Reopen stdin in case some idiot closed it before starting
us - it will only be closed, but not having it open here
screws up other things that will be opened */
if (fdopen(0,"r") == NULL) {
(void) open("dev/null", 0);
}
acquire_daemonlock(0);
set_cron_uid();
set_cron_cwd();
#if defined(POSIX)
setenv("PATH", _PATH_DEFPATH, 1);
#endif
/* Get the default locale character set for the mail
* "Content-Type: ...; charset=" header
*/
setlocale(LC_ALL,""); /* set locale to system defaults or to
that specified by any LC_* env vars */
setlocale(LC_COLLATE, "C"); /* Except for collation, since load_database() uses a-z */
/* Except that "US-ASCII" is preferred to "ANSI_x3.4-1968" in MIME,
* even though "ANSI_x3.4-1968" is the official charset name. */
if ( ( cs = nl_langinfo( CODESET ) ) != 0L &&
strcasecmp(cs, "ANSI_x3.4-1968") != 0 )
strncpy( cron_default_mail_charset, cs, MAX_ENVSTR );
else
strcpy( cron_default_mail_charset, "US-ASCII" );
/* if there are no debug flags turned on, fork as a daemon should.
*/
# if DEBUGGING
if (DebugFlags) {
# else
if (0) {
# endif
(void) fprintf(stderr, "[%d] cron started\n", getpid());
} else if (!stay_foreground) {
switch (fork()) {
case -1:
log_it("CRON",getpid(),"DEATH","can't fork");
exit(0);
break;
case 0:
/* child process */
log_it("CRON",getpid(),"STARTUP","fork ok");
(void) setsid();
freopen("/dev/null", "r", stdin);
freopen("/dev/null", "w", stdout);
freopen("/dev/null", "w", stderr);
break;
default:
/* parent process should just die */
_exit(0);
}
}
acquire_daemonlock(0);
database.head = NULL;
database.tail = NULL;
database.sys_mtime = (time_t) 0;
database.user_mtime = (time_t) 0;
#ifdef DEBIAN
database.sysd_mtime = (time_t) 0;
#endif
load_database(&database);
set_time(TRUE);
run_reboot_jobs(&database);
timeRunning = virtualTime = clockTime;
/*
* too many clocks, not enough time (Al. Einstein)
* These clocks are in minutes since the epoch (time()/60).
* virtualTime: is the time it *would* be if we woke up
* promptly and nobody ever changed the clock. It is
* monotonically increasing... unless a timejump happens.
* At the top of the loop, all jobs for 'virtualTime' have run.
* timeRunning: is the time we last awakened.
* clockTime: is the time when set_time was last called.
*/
while (TRUE) {
time_min timeDiff;
int wakeupKind;
/* ... wait for the time (in minutes) to change ... */
do {
cron_sleep(timeRunning + 1);
set_time(FALSE);
} while (clockTime == timeRunning);
timeRunning = clockTime;
check_orphans(&database);
load_database(&database);
/*
* ... calculate how the current time differs from
* our virtual clock. Classify the change into one
* of 4 cases
*/
timeDiff = timeRunning - virtualTime;
Debug(DSCH, ("[%d] pulse: %d = %d - %d\n",
getpid(), timeDiff, timeRunning, virtualTime));
/* shortcut for the most common case */
if (timeDiff == 1) {
virtualTime = timeRunning;
find_jobs(virtualTime, &database, TRUE, TRUE);
} else {
wakeupKind = -1;
if (timeDiff > -(3*MINUTE_COUNT))
wakeupKind = 0;
if (timeDiff > 0)
wakeupKind = 1;
if (timeDiff > 5)
wakeupKind = 2;
if (timeDiff > (3*MINUTE_COUNT))
wakeupKind = 3;
switch (wakeupKind) {
case 1:
/*
* case 1: timeDiff is a small positive number
* (wokeup late) run jobs for each virtual minute
* until caught up.
*/
Debug(DSCH, ("[%d], normal case %d minutes to go\n",
getpid(), timeRunning - virtualTime))
do {
if (job_runqueue())
sleep(10);
virtualTime++;
find_jobs(virtualTime, &database, TRUE, TRUE);
} while (virtualTime< timeRunning);
break;
case 2:
/*
* case 2: timeDiff is a medium-sized positive number,
* for example because we went to DST run wildcard
* jobs once, then run any fixed-time jobs that would
* otherwise be skipped if we use up our minute
* (possible, if there are a lot of jobs to run) go
* around the loop again so that wildcard jobs have
* a chance to run, and we do our housekeeping
*/
Debug(DSCH, ("[%d], DST begins %d minutes to go\n",
getpid(), timeRunning - virtualTime))
/* run wildcard jobs for current minute */
find_jobs(timeRunning, &database, TRUE, FALSE);
/* run fixed-time jobs for each minute missed */
do {
if (job_runqueue())
sleep(10);
virtualTime++;
find_jobs(virtualTime, &database, FALSE, TRUE);
set_time(FALSE);
} while (virtualTime< timeRunning &&
clockTime == timeRunning);
break;
case 0:
/*
* case 3: timeDiff is a small or medium-sized
* negative num, eg. because of DST ending just run
* the wildcard jobs. The fixed-time jobs probably
* have already run, and should not be repeated
* virtual time does not change until we are caught up
*/
Debug(DSCH, ("[%d], DST ends %d minutes to go\n",
getpid(), virtualTime - timeRunning))
find_jobs(timeRunning, &database, TRUE, FALSE);
break;
default:
/*
* other: time has changed a *lot*,
* jump virtual time, and run everything
*/
Debug(DSCH, ("[%d], clock jumped\n", getpid()))
virtualTime = timeRunning;
find_jobs(timeRunning, &database, TRUE, TRUE);
}
}
/* jobs to be run (if any) are loaded. clear the queue */
job_runqueue();
}
}
#ifdef DEBIAN
#include <sys/stat.h>
#include <fcntl.h>
#endif
static void
run_reboot_jobs(db)
cron_db *db;
{
register user *u;
register entry *e;
int rbfd;
#ifdef DEBIAN
#define REBOOT_FILE "/var/run/crond.reboot"
/* Run on actual reboot, rather than cron restart */
if (access(REBOOT_FILE, F_OK) == 0) {
/* File exists, return */
log_it("CRON", getpid(),"INFO",
"Skipping @reboot jobs -- not system startup");
return;
}
/* Create the file */
if ((rbfd = creat(REBOOT_FILE, S_IRUSR&S_IWUSR)) < 0) {
/* Bad news, bail out */
log_it("CRON",getpid(),"DEATH","Can't create reboot check file");
exit(0);
} else {
close(rbfd);
log_it("CRON", getpid(),"INFO", "Running @reboot jobs");
}
Debug(DMISC, ("[%d], Debian running reboot jobs\n",getpid()));
#endif
Debug(DMISC, ("[%d], vixie running reboot jobs\n", getpid()));
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
find_jobs(vtime, db, doWild, doNonWild)
time_min vtime;
cron_db *db;
int doWild;
int doNonWild;
{
time_t virtualSecond = vtime * SECONDS_PER_MINUTE;
register struct tm *tm = gmtime(&virtualSecond);
register int minute, hour, dom, month, dow;
register user *u;
register entry *e;
/* make 0-based values out of these so we can use them as indicies
*/
minute = tm->tm_min -FIRST_MINUTE;
hour = tm->tm_hour -FIRST_HOUR;
dom = tm->tm_mday -FIRST_DOM;
month = tm->tm_mon +1 /* 0..11 -> 1..12 */ -FIRST_MONTH;
dow = tm->tm_wday -FIRST_DOW;
Debug(DSCH, ("[%d] tick(%d,%d,%d,%d,%d) %s %s\n",
getpid(), minute, hour, dom, month, dow,
doWild?" ":"No wildcard",doNonWild?" ":"Wildcard only"))
/* the dom/dow situation is odd. '* * 1,15 * Sun' will run on the
* first and fifteenth AND every Sunday; '* * * * Sun' will run *only*
* on Sundays; '* * 1,15 * *' will run *only* the 1st and 15th. this
* is why we keep 'e->dow_star' and 'e->dom_star'. yes, it's bizarre.
* like many bizarre things, it's the standard.
*/
for (u = db->head; u != NULL; u = u->next) {
for (e = u->crontab; e != NULL; e = e->next) {
Debug(DSCH|DEXT, ("user [%s:%d:%d:...] cmd=\"%s\"\n",
env_get("LOGNAME", e->envp),
e->uid, e->gid, e->cmd))
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)))) {
if ((doNonWild && !(e->flags & (MIN_STAR|HR_STAR)))
|| (doWild && (e->flags & (MIN_STAR|HR_STAR))))
job_add(e, u);
}
}
}
}
/*
* Set StartTime and clockTime to the current time.
* These are used for computing what time it really is right now.
* Note that clockTime is a unix wallclock time converted to minutes.
*/
static void
set_time(int initialize)
{
struct tm tm;
static int isdst;
StartTime = time(NULL);
/* We adjust the time to GMT so we can catch DST changes. */
tm = *localtime(&StartTime);
if (initialize || tm.tm_isdst != isdst) {
isdst = tm.tm_isdst;
GMToff = get_gmtoff(&StartTime, &tm);
Debug(DSCH, ("[%d] GMToff=%ld\n",
getpid(), (long)GMToff))
}
clockTime = (StartTime + GMToff) / (time_t)SECONDS_PER_MINUTE;
}
/*
* try to just hit the next minute
*/
static void
cron_sleep(target)
time_min target;
{
time_t t;
int seconds_to_wait;
t = time(NULL) + GMToff;
seconds_to_wait = (int)(target * SECONDS_PER_MINUTE - t) + 1;
Debug(DSCH, ("[%d] TargetTime=%ld, sec-to-wait=%d\n",
getpid(), (long)target*SECONDS_PER_MINUTE, seconds_to_wait))
if (seconds_to_wait > 0 && seconds_to_wait < 65)
sleep((unsigned int) seconds_to_wait);
}
#ifdef USE_SIGCHLD
static void
sigchld_handler(x) {
int save_errno = errno;
WAIT_T waiter;
PID_T pid;
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()))
errno = save_errno;
return;
case 0:
Debug(DPROC,
("[%d] sigchld...no dead kids\n", getpid()))
errno = save_errno;
return;
default:
Debug(DPROC,
("[%d] sigchld...pid #%d died, stat=%d\n",
getpid(), pid, WEXITSTATUS(waiter)))
}
}
errno = save_errno;
}
#endif /*USE_SIGCHLD*/
static void
sighup_handler(x) {
log_close();
/* we should use sigaction for proper signal blocking as this
has a race, but... */
signal(SIGHUP, sighup_handler);
}
static void
parse_args(argc, argv)
int argc;
char *argv[];
{
int argch;
log_level = 1;
stay_foreground = 0;
lsbsysinit_mode = 0;
fqdn_in_subject = 0;
while (EOF != (argch = getopt(argc, argv, "lfnx:L:"))) {
switch (argch) {
default:
usage();
case 'f':
stay_foreground = 1;
break;
case 'x':
if (!set_debug_flags(optarg))
usage();
break;
case 'l':
lsbsysinit_mode = 1;
break;
case 'n':
fqdn_in_subject = 1;
break;
case 'L':
log_level = atoi(optarg);
break;
}
}
}
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