Add a mechanism to prevent cron jobs from running concurrently.
This adds a new "-s" flag to the command field which indicates that
only a single instance of the job should run concurrenty.
OK beck@ job@ deraadt@

Add crontab entry option -n for "No mail when run successful"

OK jmc@ millert@

When caching the mtime of the spool directory and system crontab files,
stash a struct timespec, not just a time_t. Fixes a bug where cron
could skip re-reading the spool after two consecutive changes.

queue(3) instead of homegrown queues and lists. This also fixes
some potential memory leaks in error paths. OK guenther@

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@

UUpdate ISC copyright year to 2004
Remove unused macros Skip_Line and MkLower
Remove trailing whitespace

Move atrun(8) functionality into cron(8) proper. This fixes the
long-standing annoyance that atrun's granularity is 10 minutes.
Most at jobs run with a 1 minute granularity. Jobs submitted via
"at now" or "batch" will run immediately. Includes a rewritten
cron(8) man page. at(1) will be integrated more closely into
cron at a future date.

Upgrading notes:
the atrun job in root's crontab should be removed.
the /var/at/spool directory is no longer used

Merge in some changes from Paul Vixie's tree; most are cosmetic
o ANSI function headers
o return (foo) not return foo
o add -oi to sendmail flags
o update email address in man pages
o make some strings const
o completely remove globbing cruft from popen.c
o whitespace changes
o add DOW_STAR to flags for "monthly", "weekly", and "daily" cron entries

Normalize the time in minutes to GMT so we can really catch DST changes
(since time() does not change during a DST switch). This makes cron
correctly detect DST changes. It does not fix the problem of wildcard
jobs running multiple times. Also, don't rely on tm_gmtoff since that
is non-standard (but use it when we have it).

Update to ISC cron 4.0b1 + our patches. This is now under a BSD license.
I also fixed the signal handlers while I was at it.

Add crontab entry option -n for "No mail when run successful"

OK jmc@ millert@

When caching the mtime of the spool directory and system crontab files,
stash a struct timespec, not just a time_t. Fixes a bug where cron
could skip re-reading the spool after two consecutive changes.

queue(3) instead of homegrown queues and lists. This also fixes
some potential memory leaks in error paths. OK guenther@

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@

UUpdate ISC copyright year to 2004
Remove unused macros Skip_Line and MkLower
Remove trailing whitespace

Move atrun(8) functionality into cron(8) proper. This fixes the
long-standing annoyance that atrun's granularity is 10 minutes.
Most at jobs run with a 1 minute granularity. Jobs submitted via
"at now" or "batch" will run immediately. Includes a rewritten
cron(8) man page. at(1) will be integrated more closely into
cron at a future date.

Upgrading notes:
the atrun job in root's crontab should be removed.
the /var/at/spool directory is no longer used

Merge in some changes from Paul Vixie's tree; most are cosmetic
o ANSI function headers
o return (foo) not return foo
o add -oi to sendmail flags
o update email address in man pages
o make some strings const
o completely remove globbing cruft from popen.c
o whitespace changes
o add DOW_STAR to flags for "monthly", "weekly", and "daily" cron entries

Normalize the time in minutes to GMT so we can really catch DST changes
(since time() does not change during a DST switch). This makes cron
correctly detect DST changes. It does not fix the problem of wildcard
jobs running multiple times. Also, don't rely on tm_gmtoff since that
is non-standard (but use it when we have it).

Update to ISC cron 4.0b1 + our patches. This is now under a BSD license.
I also fixed the signal handlers while I was at it.

When caching the mtime of the spool directory and system crontab files,
stash a struct timespec, not just a time_t. Fixes a bug where cron
could skip re-reading the spool after two consecutive changes.

queue(3) instead of homegrown queues and lists. This also fixes
some potential memory leaks in error paths. OK guenther@

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@

UUpdate ISC copyright year to 2004
Remove unused macros Skip_Line and MkLower
Remove trailing whitespace

Move atrun(8) functionality into cron(8) proper. This fixes the
long-standing annoyance that atrun's granularity is 10 minutes.
Most at jobs run with a 1 minute granularity. Jobs submitted via
"at now" or "batch" will run immediately. Includes a rewritten
cron(8) man page. at(1) will be integrated more closely into
cron at a future date.

Upgrading notes:
the atrun job in root's crontab should be removed.
the /var/at/spool directory is no longer used

Merge in some changes from Paul Vixie's tree; most are cosmetic
o ANSI function headers
o return (foo) not return foo
o add -oi to sendmail flags
o update email address in man pages
o make some strings const
o completely remove globbing cruft from popen.c
o whitespace changes
o add DOW_STAR to flags for "monthly", "weekly", and "daily" cron entries

Normalize the time in minutes to GMT so we can really catch DST changes
(since time() does not change during a DST switch). This makes cron
correctly detect DST changes. It does not fix the problem of wildcard
jobs running multiple times. Also, don't rely on tm_gmtoff since that
is non-standard (but use it when we have it).

Update to ISC cron 4.0b1 + our patches. This is now under a BSD license.
I also fixed the signal handlers while I was at it.