crond: reorder functions to follow usual order: "main last"
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
9388b4e720
commit
4a09aefae2
@ -17,25 +17,25 @@
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/* glibc frees previous setenv'ed value when we do next setenv()
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* of the same variable. uclibc does not do this! */
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#if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
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#define SETENV_LEAKS 0
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# define SETENV_LEAKS 0
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#else
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#define SETENV_LEAKS 1
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# define SETENV_LEAKS 1
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#endif
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#define TMPDIR CONFIG_FEATURE_CROND_DIR
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#define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
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#ifndef SENDMAIL
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#define SENDMAIL "sendmail"
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# define SENDMAIL "sendmail"
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#endif
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#ifndef SENDMAIL_ARGS
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#define SENDMAIL_ARGS "-ti", NULL
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# define SENDMAIL_ARGS "-ti", NULL
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#endif
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#ifndef CRONUPDATE
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#define CRONUPDATE "cron.update"
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# define CRONUPDATE "cron.update"
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#endif
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#ifndef MAXLINES
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#define MAXLINES 256 /* max lines in non-root crontabs */
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# define MAXLINES 256 /* max lines in non-root crontabs */
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#endif
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@ -108,20 +108,6 @@ struct globals {
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} while (0)
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static void CheckUpdates(void);
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static void SynchronizeDir(void);
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static int TestJobs(time_t t1, time_t t2);
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static void RunJobs(void);
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static int CheckJobs(void);
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static void RunJob(const char *user, CronLine *line);
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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static void EndJob(const char *user, CronLine *line);
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#else
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#define EndJob(user, line) ((line)->cl_Pid = 0)
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#endif
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static void DeleteFile(const char *userName);
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/* 0 is the most verbose, default 8 */
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#define LVL5 "\x05"
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#define LVL7 "\x07"
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@ -163,101 +149,6 @@ static void crondlog(const char *ctl, ...)
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exit(20);
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}
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int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int crond_main(int argc UNUSED_PARAM, char **argv)
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{
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time_t t2;
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int rescan;
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int sleep_time;
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unsigned opts;
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INIT_G();
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/* "-b after -f is ignored", and so on for every pair a-b */
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opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
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":l+:d+"; /* -l and -d have numeric param */
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opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
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&LogLevel, &LogFile, &CDir
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IF_FEATURE_CROND_D(,&LogLevel));
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/* both -d N and -l N set the same variable: LogLevel */
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if (!(opts & OPT_f)) {
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/* close stdin, stdout, stderr.
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* close unused descriptors - don't need them. */
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bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
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}
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if (!(opts & OPT_d) && LogFile == NULL) {
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/* logging to syslog */
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openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
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logmode = LOGMODE_SYSLOG;
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}
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xchdir(CDir);
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//signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
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xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
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crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", LogLevel);
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SynchronizeDir();
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write_pidfile("/var/run/crond.pid");
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/* main loop - synchronize to 1 second after the minute, minimum sleep
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* of 1 second. */
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t2 = time(NULL);
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rescan = 60;
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sleep_time = 60;
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for (;;) {
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time_t t1;
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long dt;
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t1 = t2;
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sleep((sleep_time + 1) - (time(NULL) % sleep_time));
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t2 = time(NULL);
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dt = (long)t2 - (long)t1;
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/*
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* The file 'cron.update' is checked to determine new cron
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* jobs. The directory is rescanned once an hour to deal
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* with any screwups.
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*
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* Check for time jump. Disparities over an hour either way
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* result in resynchronization. A negative disparity
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* less than an hour causes us to effectively sleep until we
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* match the original time (i.e. no re-execution of jobs that
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* have just been run). A positive disparity less than
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* an hour causes intermediate jobs to be run, but only once
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* in the worst case.
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*
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* When running jobs, the inequality used is greater but not
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* equal to t1, and less then or equal to t2.
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*/
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if (--rescan == 0) {
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rescan = 60;
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SynchronizeDir();
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}
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CheckUpdates();
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if (DebugOpt)
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crondlog(LVL5 "wakeup dt=%ld", dt);
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if (dt < -60 * 60 || dt > 60 * 60) {
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crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
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/* and we do not run any jobs in this case */
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} else if (dt > 0) {
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/* Usual case: time advances forwad, as expected */
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TestJobs(t1, t2);
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RunJobs();
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sleep(5);
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if (CheckJobs() > 0) {
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sleep_time = 10;
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} else {
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sleep_time = 60;
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}
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}
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/* else: time jumped back, do not run any jobs */
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} /* for (;;) */
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return 0; /* not reached */
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}
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#if SETENV_LEAKS
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/* We set environment *before* vfork (because we want to use vfork),
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* so we cannot use setenv() - repeated calls to setenv() may leak memory!
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@ -452,6 +343,48 @@ static void FixDayDow(CronLine *line)
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}
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}
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/*
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* DeleteFile() - delete user database
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*
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* Note: multiple entries for same user may exist if we were unable to
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* completely delete a database due to running processes.
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*/
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static void DeleteFile(const char *userName)
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{
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CronFile **pfile = &FileBase;
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CronFile *file;
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while ((file = *pfile) != NULL) {
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if (strcmp(userName, file->cf_User) == 0) {
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CronLine **pline = &file->cf_LineBase;
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CronLine *line;
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file->cf_Running = 0;
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file->cf_Deleted = 1;
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while ((line = *pline) != NULL) {
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if (line->cl_Pid > 0) {
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file->cf_Running = 1;
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pline = &line->cl_Next;
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} else {
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*pline = line->cl_Next;
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free(line->cl_Shell);
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free(line);
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}
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}
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if (file->cf_Running == 0) {
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*pfile = file->cf_Next;
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free(file->cf_User);
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free(file);
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} else {
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pfile = &file->cf_Next;
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}
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} else {
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pfile = &file->cf_Next;
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}
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}
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}
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static void SynchronizeFile(const char *fileName)
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{
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struct parser_t *parser;
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@ -600,51 +533,7 @@ static void SynchronizeDir(void)
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}
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/*
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* DeleteFile() - delete user database
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*
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* Note: multiple entries for same user may exist if we were unable to
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* completely delete a database due to running processes.
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*/
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static void DeleteFile(const char *userName)
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{
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CronFile **pfile = &FileBase;
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CronFile *file;
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while ((file = *pfile) != NULL) {
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if (strcmp(userName, file->cf_User) == 0) {
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CronLine **pline = &file->cf_LineBase;
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CronLine *line;
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file->cf_Running = 0;
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file->cf_Deleted = 1;
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while ((line = *pline) != NULL) {
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if (line->cl_Pid > 0) {
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file->cf_Running = 1;
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pline = &line->cl_Next;
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} else {
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*pline = line->cl_Next;
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free(line->cl_Shell);
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free(line);
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}
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}
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if (file->cf_Running == 0) {
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*pfile = file->cf_Next;
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free(file->cf_User);
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free(file);
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} else {
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pfile = &file->cf_Next;
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}
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} else {
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pfile = &file->cf_Next;
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}
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}
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}
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/*
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* TestJobs()
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*
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* determine which jobs need to be run. Under normal conditions, the
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* Determine which jobs need to be run. Under normal conditions, the
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* period is about a minute (one scan). Worst case it will be one
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* hour (60 scans).
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*/
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@ -695,35 +584,63 @@ static int TestJobs(time_t t1, time_t t2)
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return nJobs;
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}
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static void RunJobs(void)
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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static void
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ForkJob(const char *user, CronLine *line, int mailFd,
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const char *prog, const char *cmd, const char *arg,
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const char *mail_filename);
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/*
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* EndJob - called when job terminates and when mail terminates
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*/
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static void EndJob(const char *user, CronLine *line)
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{
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CronFile *file;
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CronLine *line;
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int mailFd;
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char mailFile[128];
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struct stat sbuf;
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for (file = FileBase; file; file = file->cf_Next) {
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if (!file->cf_Ready)
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continue;
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/* No job */
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if (line->cl_Pid <= 0) {
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line->cl_Pid = 0;
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return;
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}
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file->cf_Ready = 0;
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for (line = file->cf_LineBase; line; line = line->cl_Next) {
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if (line->cl_Pid >= 0)
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continue;
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/*
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* End of job and no mail file
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* End of sendmail job
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*/
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snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
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line->cl_Pid = 0;
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RunJob(file->cf_User, line);
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crondlog(LVL8 "USER %s pid %3d cmd %s",
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file->cf_User, (int)line->cl_Pid, line->cl_Shell);
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if (line->cl_Pid < 0) {
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file->cf_Ready = 1;
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} else if (line->cl_Pid > 0) {
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file->cf_Running = 1;
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if (line->cl_MailFlag == 0) {
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return;
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}
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line->cl_MailFlag = 0;
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/*
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* End of primary job - check for mail file. If size has increased and
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* the file is still valid, we sendmail it.
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*/
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mailFd = open(mailFile, O_RDONLY);
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unlink(mailFile);
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if (mailFd < 0) {
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return;
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}
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if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
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|| sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
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|| !S_ISREG(sbuf.st_mode)
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) {
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close(mailFd);
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return;
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}
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if (line->cl_MailTo)
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ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
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}
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#else
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# define EndJob(user, line) ((line)->cl_Pid = 0)
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#endif
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/*
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* CheckJobs() - check for job completion
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*
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* Check for job completion, return number of jobs still running after
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* all done.
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*/
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@ -855,55 +772,7 @@ static void RunJob(const char *user, CronLine *line)
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ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
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}
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/*
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* EndJob - called when job terminates and when mail terminates
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*/
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static void EndJob(const char *user, CronLine *line)
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{
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int mailFd;
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char mailFile[128];
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struct stat sbuf;
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/* No job */
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if (line->cl_Pid <= 0) {
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line->cl_Pid = 0;
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return;
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}
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/*
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* End of job and no mail file
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* End of sendmail job
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*/
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snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
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line->cl_Pid = 0;
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if (line->cl_MailFlag == 0) {
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return;
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}
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line->cl_MailFlag = 0;
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/*
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* End of primary job - check for mail file. If size has increased and
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* the file is still valid, we sendmail it.
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*/
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mailFd = open(mailFile, O_RDONLY);
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unlink(mailFile);
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if (mailFd < 0) {
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return;
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}
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if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
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|| sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
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|| !S_ISREG(sbuf.st_mode)
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) {
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close(mailFd);
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return;
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}
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if (line->cl_MailTo)
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ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
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}
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#else /* crond without sendmail */
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#else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
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static void RunJob(const char *user, CronLine *line)
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{
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@ -943,4 +812,125 @@ static void RunJob(const char *user, CronLine *line)
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line->cl_Pid = pid;
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}
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#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
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#endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
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static void RunJobs(void)
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{
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CronFile *file;
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CronLine *line;
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for (file = FileBase; file; file = file->cf_Next) {
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if (!file->cf_Ready)
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continue;
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file->cf_Ready = 0;
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for (line = file->cf_LineBase; line; line = line->cl_Next) {
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if (line->cl_Pid >= 0)
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continue;
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RunJob(file->cf_User, line);
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crondlog(LVL8 "USER %s pid %3d cmd %s",
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file->cf_User, (int)line->cl_Pid, line->cl_Shell);
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if (line->cl_Pid < 0) {
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file->cf_Ready = 1;
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} else if (line->cl_Pid > 0) {
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file->cf_Running = 1;
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}
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}
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}
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}
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int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int crond_main(int argc UNUSED_PARAM, char **argv)
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{
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time_t t2;
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int rescan;
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int sleep_time;
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unsigned opts;
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INIT_G();
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/* "-b after -f is ignored", and so on for every pair a-b */
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opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
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":l+:d+"; /* -l and -d have numeric param */
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opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
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&LogLevel, &LogFile, &CDir
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IF_FEATURE_CROND_D(,&LogLevel));
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/* both -d N and -l N set the same variable: LogLevel */
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if (!(opts & OPT_f)) {
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/* close stdin, stdout, stderr.
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* close unused descriptors - don't need them. */
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bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
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}
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if (!(opts & OPT_d) && LogFile == NULL) {
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/* logging to syslog */
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openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
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logmode = LOGMODE_SYSLOG;
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}
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xchdir(CDir);
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//signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
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xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
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crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", LogLevel);
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SynchronizeDir();
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write_pidfile("/var/run/crond.pid");
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/* main loop - synchronize to 1 second after the minute, minimum sleep
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* of 1 second. */
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t2 = time(NULL);
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rescan = 60;
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sleep_time = 60;
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for (;;) {
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time_t t1;
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long dt;
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t1 = t2;
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sleep((sleep_time + 1) - (time(NULL) % sleep_time));
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t2 = time(NULL);
|
||||
dt = (long)t2 - (long)t1;
|
||||
|
||||
/*
|
||||
* The file 'cron.update' is checked to determine new cron
|
||||
* jobs. The directory is rescanned once an hour to deal
|
||||
* with any screwups.
|
||||
*
|
||||
* Check for time jump. Disparities over an hour either way
|
||||
* result in resynchronization. A negative disparity
|
||||
* less than an hour causes us to effectively sleep until we
|
||||
* match the original time (i.e. no re-execution of jobs that
|
||||
* have just been run). A positive disparity less than
|
||||
* an hour causes intermediate jobs to be run, but only once
|
||||
* in the worst case.
|
||||
*
|
||||
* When running jobs, the inequality used is greater but not
|
||||
* equal to t1, and less then or equal to t2.
|
||||
*/
|
||||
if (--rescan == 0) {
|
||||
rescan = 60;
|
||||
SynchronizeDir();
|
||||
}
|
||||
CheckUpdates();
|
||||
if (DebugOpt)
|
||||
crondlog(LVL5 "wakeup dt=%ld", dt);
|
||||
if (dt < -60 * 60 || dt > 60 * 60) {
|
||||
crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
|
||||
/* and we do not run any jobs in this case */
|
||||
} else if (dt > 0) {
|
||||
/* Usual case: time advances forwad, as expected */
|
||||
TestJobs(t1, t2);
|
||||
RunJobs();
|
||||
sleep(5);
|
||||
if (CheckJobs() > 0) {
|
||||
sleep_time = 10;
|
||||
} else {
|
||||
sleep_time = 60;
|
||||
}
|
||||
}
|
||||
/* else: time jumped back, do not run any jobs */
|
||||
} /* for (;;) */
|
||||
|
||||
return 0; /* not reached */
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user