MFC r345512: Correct contradictory information on default syslog logging
priority.

MFC r332518, r332527

r332518:
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.

r332527:
Fix cut-and-pasted line to have the right option letter.

MFC r328434 by maxim:

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

PR: 225441

MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

DIRDEPS_BUILD: Update dependencies.

This is a direct commit since MFCing these changes is impractical.

Sponsored by: Dell EMC Isilon

MFC r307769: 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.

Relnotes: yes

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

o -t comman line option added to the usage().

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

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Convert usr.sbin to LIBADD
Reduce overlinking

Fork a child process and wait until the process terminates when the -P
option is specified. This behavior is documented on the manual page.

PR: bin/187265
Submitted by: Kimo R
MFC after: 2 weeks

1. Properly clean pid files in the case of the error.
2. Write the supervisor pid before the restart loop, so we don't
uselessly rewrite it after every child restart.
3. Remove duplicate ppfh and pfh initialization.

Approved by: re (glebius)
MFC after: 2 weeks

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)

Remove bogus '-' from getopt(3) string hit when porting daemon(8) to
GNU/Linux *duck*.

MFC after: 1 week

Document -r option in SYNOPSIS and usage statement.

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

On a child exit, call waitpid(2) to clean up the process table.

Submitted by: Andrey Zonov <andrey zonov.org>
MFC after: 1 week

If permitted protect the supervisor against pageout kill.

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

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.

Allow daemon(8) to run pidfile_open() before relenquishing privileges
so pid files can be written in /var/run when started as root.

I do not expect this to cause any security issues, but if anyone objects
it could be easily reverted.

PR: bin/159568
MFC after: 4 weeks

Slightly improve wording.

The last big commit: let usr.sbin/ use WARNS=6 by default.

Unbreak rev 1.7's getopt usage. The -f switch does not take an argument.
The stray ':' was from the defunct '-g' group arg.

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)

Initialize *pfh to NULL to quiet a gcc warning, not part of my original
commit because it was not part of the new code.

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

add FBSDID

style.Makefile(5)

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