daemon: Add -C (--restart-count) option

Add a new option (-C, --restart-count) to specify the maximum
number of times that the controlled process is restarted if
restart (-r) is restarted.

Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D44944

daemon: fix clang-tidy warnings

Fixed narrowing conversions:
- strtol replaced with strtonum with range check
- read returns ssize_t
- kevent.data explicitly cast to int before passing into strerror

While we we're here:
- Defined and documented maximum restart delay.
- Fixed typo in a comment.
- Remove unused includes

Reviewed by: cperciva, kevans

daemon.8: Document -u sets HOME, USER, and SHELL

Fixes: 6b3ad1d73732 When -u option is used also set USER, HOME and SHELL
MFC after: 3 days

daemon.8: Sort options in DESCRIPTION

MFC after: 3 days

daemon.8: Use Cm where appropriate

MFC after: 3 days

daemon.8: Use Dv for signal names

MFC after: 3 days

Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

daemon: add long_opts

Long options improve readability of scripts, makes code comprehension
easier. This patch adds long options while preserving the existing CLI
interface.

Also --help/-h option is added.

Reviewed by: allanjude, pauamma (both earlier versions), kevans
Differential Revision: https://reviews.freebsd.org/D38244

Fix a typo

"and" is not a flag.

MFC after: 3 days

Fix a typo in the 366098.

Reported by: 0mp
MFC after: 2 weeks
(along with 366098)

dd a new option (-H) to daemon(8) to catch SIGHUP and re-open output_file file when
received.

The default system log rotation mechanism (newsyslog(8)) requires ability to send
signal to a daemon in order to properly complete rotation of the logs in an "atomic"
manner without having to making a copy and truncating original file. Unfortunately
our built-in mechanism to convert "dumb" programs into daemons has no way to handle
this rotation properly. This change adds this ability, to be enabled by supplying -H
option in addition to the -o option.

Reviewed by: markj, rpokala (manpages)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D26526

Bump .Dd for earlier update (should have been part of r353024).

Clarify how the -f option for daemon(8) interacts with other options
related to redirecting stdout and stderr.

Correct contradictory information on default syslog logging priority.

MFC after: 1 week

Cross-reference nohup(1) and daemon(8).

Reviewed by: bcr
Approved by: krion (mentor, implicit), mat (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D17920

Add a missing "Ar" macro to the description of the -R flag in the manpage.

Approved by: bjk (doc committer), krion (mentor)
Differential Revision: https://reviews.freebsd.org/D16520

Fix cut-and-pasted line to have the right option letter.

Reported by: 0mp@
Pointy hat: ian@

Add an option to daemon(8) to specify a delay between restarts of a
supervised program. The existing -r option has a hard-coded delay of one
second. This change adds a -R option which takes a delay in seconds. This
can be used to prevent log spam and rapid restarts, similar to init(8)'s
behavior of adding a delay between rapid restarts when it's supervising a
program.

o A command line flag for the syslog_facility fixed in the SYNOPSIS.

PR: 225441

daemon: Allow logging daemon stdout/stderr to file or syslog.

There are various new options, documented in the man page, to send the
daemon's standard output and/or standard error to a file or to syslog.

Submitted by: ank at iki.fi
Reviewed by: wblock (man page only)
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D7993

daemon(8): Add -t option to set process title

The default process title is taken from the argv[0] value (any
particular hardlink name). Add a -t option to override the default.

PR: 205016
Submitted by: Yuri <yuri@rawbw.com>
No objection from: freebsd-current@
Sponsored by: EMC / Isilon Storage Division

mdoc: remove EOL whitespace.

Approved by: re (blanket)

add support for writing the pid of the daemon program to a pid file so
that daemon can be used w/ rc.subr and ports can use the additional
functionality, such as keeping the ldap daemon up and running, and have
the proper program to signal to exit..

PR: bin/181341
Submitted by: feld
Approved by: re (glebius)

Document -r option in SYNOPSIS and usage statement.

Submitted by: Andrey Zonov <andrey zonov.org>
MFC after: 3 days

Add -r option to restart the program if it has been terminated.

Suggested by: Andrey Zonov <andrey zonov org>
MFC after: 2 weeks

If the supervising process receives SIGTERM, forward it to the spawned
process. Normally it will cause the child to exit followed by the
termination of the supervisor after removing the pidfile.

This looks like desirable behavior, because termination of a
supervisor usually supposes termination of its charge. Also it will
fix the issue with stale pid files after reboot due to init kills a
supervisor before its child exits.

MFC after: 2 weeks

The pidfile_open(3) is going to be fixed to set close-on-exec in order
not to leak the descriptor after exec(3). This raises the issue for
daemon(3) of the pidfile lock to be lost when the child process
executes.

To solve this and also to have the pidfile cleaned up when the program
exits, if a pidfile is specified, spawn a child to exec the command
and wait in the parent keeping the pidfile locked until the child
process exits and remove the file.

Reported by: Andrey Zonov <andrey zonov org>
Suggested by: pjd
Reviewed by: pjd
MFC after: 2 weeks

Change the notes about the pidfile to include Doug's preference
for pre-creating the pidfile with appropriate owner and permissions.

Requested by dougb

Revert 229667: After some discussion of this change, it seems it is
better to leave the pidfile open where it was. Add a note to the
man page describing pidfile strategies to use if the daemon is to
be run as a user other than root.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Slightly improve wording.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Improve previous commit by using setusercontext(3) and removing the group
option. Bump doc date for manual page changes.

Reviewed by: rwatson, ru, will (older version)

Add support for dropping privileges to a specified user and/or group.

PR: 108523
Submitted by: Dmitri Alenitchev <dmitri@dworlds.ru> (original version)
Reviewed by: mpp (first reply to PR)

Teach daemon(8) how to use pidfile(3).

Added the EXIT STATUS section where appropriate.

mdoc(7) fixes.

Give daemon(8) the ability to create a pid-file. Since the target program
does not know anything about the pid-file and we don't keep a babysitting
process for the task, the pid-file will linger.

Submitted by: mi
PR: 56398

MFS: 1.2.2.2

mdoc(7) police: minor formatting tweaks.

Add a new utility that runs an executable detached from the
controlling terminal.

Discussed on: -hackers
Obtained from: BSD/OS