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diff -up cronie-1.4.11/src/misc.c.ddd cronie-1.4.11/src/misc.c
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--- cronie-1.4.11/src/misc.c.ddd 2013-07-18 14:27:08.000000000 +0200
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+++ cronie-1.4.11/src/misc.c 2013-08-30 13:51:22.227040980 +0200
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@@ -75,7 +75,9 @@ static int LogFD = ERR;
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static int syslog_open = FALSE;
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#endif
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-#if defined(HAVE_FCNTL) && defined(F_SETLK)
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+#if defined(HAVE_FLOCK)
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+# define trylock_file(fd) flock((fd), LOCK_EX|LOCK_NB)
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+#elif defined(HAVE_FCNTL) && defined(F_SETLK)
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static int trylock_file(int fd) {
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struct flock fl;
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@@ -89,8 +91,6 @@ static int trylock_file(int fd) {
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}
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#elif defined(HAVE_LOCKF)
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# define trylock_file(fd) lockf((fd), F_TLOCK, 0)
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-#elif defined(HAVE_FLOCK)
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-# define trylock_file(fd) flock((fd), LOCK_EX|LOCK_NB)
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#endif
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/*
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@@ -346,6 +346,14 @@ void acquire_daemonlock(int closeflag) {
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(void) fcntl(fd, F_SETFD, 1);
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}
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+#if !defined(HAVE_FLOCK)
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+ else {
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+ /* Racy but better than nothing, just hope the parent exits */
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+ sleep(0);
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+ trylock_file(fd);
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+ }
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+#endif
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+
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sprintf(buf, "%ld\n", (long) pid);
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(void) lseek(fd, (off_t) 0, SEEK_SET);
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len = strlen(buf);
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