Change cron from including all headers in every file to only including what each .c file needs. I have not removed cron.h since it will be used in a future clean up of the cron's .h files. OK nicm@

usr.bin/at/at.c

···
-/*	$OpenBSD: at.c,v 1.67 2015/11/03 16:28:43 millert Exp $	*/
+/*	$OpenBSD: at.c,v 1.68 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  *  at.c : Put file into atrun queue
···
 
 #define	MAIN_PROGRAM
 
-#include "cron.h"
-#include "at.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <bitstring.h>                  /* for structs.h */
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <limits.h>
+#include <locale.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
+
+#include "at.h"
 
 #define ALARMC 10		/* Number of seconds to wait for timeout */
 #define TIMESIZE 50		/* Size of buffer passed to strftime() */

usr.sbin/cron/atrun.c

···
-/*	$OpenBSD: atrun.c,v 1.33 2015/10/25 21:30:11 millert Exp $	*/
+/*	$OpenBSD: atrun.c,v 1.34 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  * Copyright (c) 2002-2003 Todd C. Miller <[e-mail]>
···
  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <bsd_auth.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <limits.h>
-#include <sys/resource.h>
+#include <login_cap.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 static void unlink_job(at_db *, atjob *);
 static void run_job(atjob *, char *);

usr.sbin/cron/client.c

···
-/*	$OpenBSD: client.c,v 1.2 2015/11/03 04:16:36 guenther Exp $	*/
+/*	$OpenBSD: client.c,v 1.3 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+#include <unistd.h>
+#include <utime.h>
+
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 /* int in_file(const char *string, FILE *file, int error)
  *	return TRUE if one of the lines in file matches string exactly,

usr.sbin/cron/common.c

···
-/*	$OpenBSD: common.c,v 1.1 2015/10/31 12:19:41 millert Exp $	*/
+/*	$OpenBSD: common.c,v 1.2 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <errno.h>
+#include <grp.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 void
 set_cron_cwd(void)

usr.sbin/cron/cron.c

···
-/*	$OpenBSD: cron.c,v 1.61 2015/11/04 12:53:05 millert Exp $	*/
+/*	$OpenBSD: cron.c,v 1.62 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
 
 #define	MAIN_PROGRAM
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>
+#include <errno.h>
+#include <locale.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 enum timejump { negative, small, medium, large };
 

usr.sbin/cron/cron.h

···
-/*	$OpenBSD: cron.h,v 1.11 2015/10/06 14:58:37 tedu Exp $	*/
+/*	$OpenBSD: cron.h,v 1.12 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#define CRON_VERSION "V5.0"
 #include "config.h"
-#include "externs.h"
 #include "pathnames.h"
 #include "macros.h"
 #include "structs.h"

usr.sbin/cron/crontab.c

···
-/*	$OpenBSD: crontab.c,v 1.81 2015/11/03 21:10:08 millert Exp $	*/
+/*	$OpenBSD: crontab.c,v 1.82 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <err.h>
-
 #define	MAIN_PROGRAM
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <err.h>
+#include <errno.h>
+#include <locale.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 #define NHEADER_LINES 3
 
 enum opt_t	{ opt_unknown, opt_list, opt_delete, opt_edit, opt_replace };
-
-static char	*getoptargs = "u:ler";
 
 static	pid_t		Pid;
 static	gid_t		crontab_gid;
···
 	strlcpy(RealUser, User, sizeof(RealUser));
 	Filename[0] = '\0';
 	Option = opt_unknown;
-	while (-1 != (argch = getopt(argc, argv, getoptargs))) {
+	while ((argch = getopt(argc, argv, "u:ler")) != -1) {
 		switch (argch) {
 		case 'u':
 			if (getuid() != 0) {

usr.sbin/cron/database.c

···
-/*	$OpenBSD: database.c,v 1.27 2015/10/26 14:27:41 millert Exp $	*/
+/*	$OpenBSD: database.c,v 1.28 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <dirent.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+#include <unistd.h>
+
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 #define HASH(a,b) ((a)+(b))
 

usr.sbin/cron/do_command.c

···
-/*	$OpenBSD: do_command.c,v 1.51 2015/10/29 22:41:27 millert Exp $	*/
+/*	$OpenBSD: do_command.c,v 1.52 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <bsd_auth.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <login_cap.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+#include <unistd.h>
 #include <vis.h>
+
+#include "config.h"
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 static void		child_process(entry *, user *);
 

usr.sbin/cron/entry.c

···
-/*	$OpenBSD: entry.c,v 1.44 2015/11/04 12:53:05 millert Exp $	*/
+/*	$OpenBSD: entry.c,v 1.45 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  * Copyright 1988,1990,1993,1994 by Paul Vixie
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <ctype.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+#include <unistd.h>
+
+#include "pathnames.h"
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 typedef	enum ecode {
 	e_none, e_minute, e_hour, e_dom, e_month, e_dow,

usr.sbin/cron/env.c

···
-/*	$OpenBSD: env.c,v 1.31 2015/10/29 21:24:09 millert Exp $	*/
+/*	$OpenBSD: env.c,v 1.32 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 char **
 env_init(void)

usr.sbin/cron/externs.h

···
-/*	$OpenBSD: externs.h,v 1.18 2015/11/04 12:53:05 millert Exp $	*/
-
-/* Copyright 1993,1994 by Paul Vixie
- * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
- * Copyright (c) 1997,2000 by Internet Software Consortium, Inc.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-/* reorder these #include's at your peril */
-
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/wait.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include <bitstring.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <grp.h>
-#include <limits.h>
-#include <locale.h>
-#include <pwd.h>
-#include <signal.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <poll.h>
-#include <unistd.h>
-#include <utime.h>
-#include <syslog.h>
-#include <login_cap.h>
-#include <bsd_auth.h>

usr.sbin/cron/job.c

···
-/*	$OpenBSD: job.c,v 1.11 2015/02/09 22:35:08 deraadt Exp $	*/
+/*	$OpenBSD: job.c,v 1.12 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>		/* for structs.h */
+
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 typedef	struct _job {
 	struct _job	*next;

usr.sbin/cron/macros.h

···
-/*	$OpenBSD: macros.h,v 1.13 2015/10/26 14:27:41 millert Exp $	*/
+/*	$OpenBSD: macros.h,v 1.14 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+
+#define CRON_VERSION	"V5.0"
 
 #define TRUE		1
 #define FALSE		0

usr.sbin/cron/misc.c

···
-/*	$OpenBSD: misc.c,v 1.67 2015/11/04 14:47:02 millert Exp $	*/
+/*	$OpenBSD: misc.c,v 1.68 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <time.h>		/* for structs.h */
+
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
+#include "globals.h"
 
 static int syslog_open = FALSE;
 
···
 			break;
 	syslog(*info ? LOG_INFO : LOG_WARNING, "(%s) %s (%s)", username, event,
 	    detail);
-
-
 }
 
 void

usr.sbin/cron/popen.c

···
-/*	$OpenBSD: popen.c,v 1.28 2015/10/04 09:08:46 tedu Exp $	*/
+/*	$OpenBSD: popen.c,v 1.29 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  * Copyright (c) 1988, 1993, 1994
···
  * globbing stuff since we don't need it.  also execvp instead of execv.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <errno.h>
+#include <login_cap.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>		/* for structs.h */
+
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 #define MAX_ARGV	100
 #define MAX_GARGV	1000

usr.sbin/cron/structs.h

···
-/*	$OpenBSD: structs.h,v 1.5 2004/06/17 22:11:55 millert Exp $	*/
+/*	$OpenBSD: structs.h,v 1.6 2015/11/04 20:28:17 millert Exp $	*/
 
 /*
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+
+struct passwd;
 
 typedef	struct _entry {
 	struct _entry	*next;

usr.sbin/cron/user.c

···
-/*	$OpenBSD: user.c,v 1.15 2015/10/06 14:58:37 tedu Exp $	*/
+/*	$OpenBSD: user.c,v 1.16 2015/11/04 20:28:17 millert Exp $	*/
 
 /* Copyright 1988,1990,1993,1994 by Paul Vixie
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
···
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "cron.h"
+#include <sys/types.h>
+
+#include <bitstring.h>		/* for structs.h */
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>		/* for structs.h */
+
+#include "macros.h"
+#include "structs.h"
+#include "funcs.h"
 
 void
 free_user(user *u)