Author: trasz
Date: Sun Aug 21 18:12:49 2016
New Revision: 304570
URL: https://svnweb.freebsd.org/changeset/base/304570

Log:
  Add the "-n" flag to cron(8), to prevent it from daemonizing.
  This makes it possible to use it with external supervisors.
  The "-n" flag name is compatible with Linux, NetBSD, and OpenBSD.
  
  Reviewed by:  jilles, pfg, wblock
  MFC after:    1 month
  Differential Revision:        https://reviews.freebsd.org/D7581

Modified:
  head/usr.sbin/cron/cron/cron.8
  head/usr.sbin/cron/cron/cron.c

Modified: head/usr.sbin/cron/cron/cron.8
==============================================================================
--- head/usr.sbin/cron/cron/cron.8      Sun Aug 21 17:57:32 2016        
(r304569)
+++ head/usr.sbin/cron/cron/cron.8      Sun Aug 21 18:12:49 2016        
(r304570)
@@ -17,7 +17,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 29, 2008
+.Dd August 21, 2016
 .Dt CRON 8
 .Os
 .Sh NAME
@@ -28,6 +28,7 @@
 .Op Fl j Ar jitter
 .Op Fl J Ar rootjitter
 .Op Fl m Ar mailto
+.Op Fl n
 .Op Fl s
 .Op Fl o
 .Op Fl x Ar debugflag Ns Op , Ns Ar ...
@@ -132,6 +133,8 @@ set to a null string, usually specified 
 .Li ''
 or
 .Li \*q\*q .
+.It Fl n
+Don't daemonize, run in foreground instead.
 .It Fl s
 Enable special handling of situations when the GMT offset of the local
 timezone changes, such as the switches between the standard time and

Modified: head/usr.sbin/cron/cron/cron.c
==============================================================================
--- head/usr.sbin/cron/cron/cron.c      Sun Aug 21 17:57:32 2016        
(r304569)
+++ head/usr.sbin/cron/cron/cron.c      Sun Aug 21 18:12:49 2016        
(r304570)
@@ -49,6 +49,7 @@ static int    run_at_secres(cron_db *);
 
 static time_t  last_time = 0;
 static int     dst_enabled = 0;
+static int     dont_daemonize = 0;
 struct pidfh *pfh;
 
 static void
@@ -58,7 +59,7 @@ usage() {
 #endif
 
        fprintf(stderr, "usage: cron [-j jitter] [-J rootjitter] "
-                       "[-m mailto] [-s] [-o] [-x debugflag[,...]]\n");
+                       "[-m mailto] [-n ] [-s] [-o] [-x debugflag[,...]]\n");
 #if DEBUGGING
        fprintf(stderr, "\ndebugflags: ");
 
@@ -136,7 +137,7 @@ main(argc, argv)
        if (0) {
 # endif
                (void) fprintf(stderr, "[%d] cron started\n", getpid());
-       } else {
+       } else if (dont_daemonize == 0) {
                if (daemon(1, 0) == -1) {
                        pidfile_remove(pfh);
                        log_it("CRON",getpid(),"DEATH","can't become daemon");
@@ -512,7 +513,7 @@ parse_args(argc, argv)
        int     argch;
        char    *endp;
 
-       while ((argch = getopt(argc, argv, "j:J:m:osx:")) != -1) {
+       while ((argch = getopt(argc, argv, "j:J:m:nosx:")) != -1) {
                switch (argch) {
                case 'j':
                        Jitter = strtoul(optarg, &endp, 10);
@@ -529,6 +530,9 @@ parse_args(argc, argv)
                case 'm':
                        defmailto = optarg;
                        break;
+               case 'n':
+                       dont_daemonize = 1;
+                       break;
                case 'o':
                        dst_enabled = 0;
                        break;
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