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diff -up at-3.1.20/atd.c.aborted at-3.1.20/atd.c
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--- at-3.1.20/atd.c.aborted	2017-09-14 15:31:47.971486148 +0200
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+++ at-3.1.20/atd.c	2017-09-14 15:43:53.506567281 +0200
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@@ -731,12 +731,17 @@ run_loop()
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 	/* Is the file already locked?
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 	 */
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 	if (buf.st_nlink > 1) {
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+	    if (run_time < buf.st_mtime)
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+		run_time = buf.st_mtime;
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 	    if (run_time + CHECK_INTERVAL <= now) {
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-
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 		/* Something went wrong the last time this was executed.
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 		 * Let's remove the lockfile and reschedule.
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+		 * We also change the timestamp to avoid rerunning the job more
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+		 * than once every CHECK_INTERVAL.
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 		 */
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 		strncpy(lock_name, dirent->d_name, sizeof(lock_name));
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+		if (utime(lock_name, 0) < 0)
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+			syslog(LOG_ERR, "utime couldn't be set for lock file %s\n", lock_name);
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 		lock_name[sizeof(lock_name)-1] = '\0';
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 		lock_name[0] = '=';
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 		unlink(lock_name);