crond: check mtime on crontab dir every minute, and reread if changed
function old new delta crond_main 1417 1460 +43 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
4a09aefae2
commit
dfc870fab7
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@ -87,6 +87,7 @@ enum {
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struct globals {
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unsigned LogLevel; /* = 8; */
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time_t CDir_mtime;
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const char *LogFile;
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const char *CDir; /* = CRONTABS; */
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CronFile *FileBase;
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@ -96,15 +97,9 @@ struct globals {
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#endif
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define LogLevel (G.LogLevel )
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#define LogFile (G.LogFile )
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#define CDir (G.CDir )
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#define FileBase (G.FileBase )
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#define env_var_user (G.env_var_user )
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#define env_var_home (G.env_var_home )
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#define INIT_G() do { \
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LogLevel = 8; \
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CDir = CRONTABS; \
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G.LogLevel = 8; \
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G.CDir = CRONTABS; \
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} while (0)
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@ -124,12 +119,12 @@ static void crondlog(const char *ctl, ...)
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int level = (ctl[0] & 0x1f);
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va_start(va, ctl);
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if (level >= (int)LogLevel) {
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if (level >= (int)G.LogLevel) {
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/* Debug mode: all to (non-redirected) stderr, */
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/* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
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if (!DebugOpt && LogFile) {
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if (!DebugOpt && G.LogFile) {
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/* Otherwise (log to file): we reopen log file at every write: */
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int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
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int logfd = open3_or_warn(G.LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
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if (logfd >= 0)
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xmove_fd(logfd, STDERR_FILENO);
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}
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@ -168,10 +163,10 @@ static void safe_setenv(char **pvar_val, const char *var, const char *val)
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static void SetEnv(struct passwd *pas)
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{
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#if SETENV_LEAKS
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safe_setenv(&env_var_user, "USER", pas->pw_name);
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safe_setenv(&env_var_home, "HOME", pas->pw_dir);
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safe_setenv(&G.env_var_user, "USER", pas->pw_name);
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safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
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/* if we want to set user's shell instead: */
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/*safe_setenv(env_var_shell, "SHELL", pas->pw_shell);*/
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/*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
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#else
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xsetenv("USER", pas->pw_name);
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xsetenv("HOME", pas->pw_dir);
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@ -308,7 +303,7 @@ static void ParseField(char *user, char *ary, int modvalue, int off,
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return;
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}
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if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */
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if (DebugOpt && (G.LogLevel <= 5)) { /* like LVL5 */
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/* can't use crondlog, it inserts '\n' */
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int i;
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for (i = 0; i < modvalue; ++i)
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@ -351,7 +346,7 @@ static void FixDayDow(CronLine *line)
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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 **pfile = &G.FileBase;
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CronFile *file;
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while ((file = *pfile) != NULL) {
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@ -462,8 +457,8 @@ static void SynchronizeFile(const char *fileName)
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}
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*pline = NULL;
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file->cf_Next = FileBase;
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FileBase = file;
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file->cf_Next = G.FileBase;
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G.FileBase = file;
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if (maxLines == 0) {
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crondlog(WARN9 "user %s: too many lines", fileName);
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@ -493,7 +488,7 @@ static void SynchronizeDir(void)
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CronFile *file;
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/* Attempt to delete the database. */
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again:
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for (file = FileBase; file; file = file->cf_Next) {
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for (file = G.FileBase; file; file = file->cf_Next) {
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if (!file->cf_Deleted) {
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DeleteFile(file->cf_User);
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goto again;
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@ -509,8 +504,8 @@ static void SynchronizeDir(void)
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* scan directory and add associated users
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*/
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unlink(CRONUPDATE);
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if (chdir(CDir) < 0) {
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crondlog(DIE9 "chdir(%s)", CDir);
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if (chdir(G.CDir) < 0) {
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crondlog(DIE9 "chdir(%s)", G.CDir);
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}
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{
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DIR *dir = opendir(".");
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@ -537,9 +532,8 @@ static void SynchronizeDir(void)
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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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static int TestJobs(time_t t1, time_t t2)
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static void TestJobs(time_t t1, time_t t2)
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{
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int nJobs = 0;
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time_t t;
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/* Find jobs > t1 and <= t2 */
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@ -553,7 +547,7 @@ static int TestJobs(time_t t1, time_t t2)
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continue;
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ptm = localtime(&t);
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for (file = FileBase; file; file = file->cf_Next) {
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for (file = G.FileBase; file; file = file->cf_Next) {
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if (DebugOpt)
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crondlog(LVL5 "file %s:", file->cf_User);
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if (file->cf_Deleted)
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@ -575,13 +569,11 @@ static int TestJobs(time_t t1, time_t t2)
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} else if (line->cl_Pid == 0) {
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line->cl_Pid = -1;
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file->cf_Ready = 1;
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++nJobs;
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}
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}
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}
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}
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}
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return nJobs;
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}
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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@ -650,7 +642,7 @@ static int CheckJobs(void)
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CronLine *line;
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int nStillRunning = 0;
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for (file = FileBase; file; file = file->cf_Next) {
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for (file = G.FileBase; file; file = file->cf_Next) {
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if (file->cf_Running) {
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file->cf_Running = 0;
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@ -819,7 +811,7 @@ static void RunJobs(void)
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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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for (file = G.FileBase; file; file = file->cf_Next) {
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if (!file->cf_Ready)
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continue;
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@ -854,9 +846,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
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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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&G.LogLevel, &G.LogFile, &G.CDir
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IF_FEATURE_CROND_D(,&G.LogLevel));
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/* both -d N and -l N set the same variable: G.LogLevel */
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if (!(opts & OPT_f)) {
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/* close stdin, stdout, stderr.
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@ -864,30 +856,32 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
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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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if (!(opts & OPT_d) && G.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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xchdir(G.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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crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.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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/* Main loop */
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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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struct stat sbuf;
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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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/* Synchronize to 1 minute, minimum 1 second */
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sleep(sleep_time - (time(NULL) % sleep_time) + 1);
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t2 = time(NULL);
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dt = (long)t2 - (long)t1;
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@ -908,6 +902,10 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
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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 (stat(G.CDir, &sbuf) == 0 && G.CDir_mtime != sbuf.st_mtime) {
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G.CDir_mtime = sbuf.st_mtime;
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rescan = 1;
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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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@ -919,10 +917,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
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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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/* Usual case: time advances forward, 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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