[Bug 297137] daemon(8): stdout redirection to syslog no longer splits output on newlines during bursts

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D297137

            Bug ID: 297137
           Summary: daemon(8): stdout redirection to syslog no longer
                    splits output on newlines during bursts
           Product: Base System
           Version: 15.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: [email protected]
          Reporter: [email protected]

daemon(8) -S no longer splits newline-delimited stdout into individual sysl=
og
messages during bursts on FreeBSD 15.1

Works correctly on FreeBSD 14.3
Reproduces on FreeBSD 15.1

Steps to reproduce:

# /usr/sbin/daemon -S -T testlog /bin/sh -c '/usr/bin/jot 10 | /usr/bin/sed
"s/^/test line /"'

Tracing with:

# truss -f -s 65535 -o /tmp/daemon.truss /usr/sbin/daemon -S -T testlog /bi=
n/sh
-c '/usr/bin/jot 10 | /usr/bin/sed "s/^/test line /"'

# grep -E 'sendto|sendmsg|writev' /tmp/daemon.truss

Expected result:

Each line is forwarded as a separate syslog message.

Actual result:

On FreeBSD 15, daemon(8) performs a single sendto() containing all lines
separated by \n, resulting in one multiline syslog message instead of multi=
ple
records.

Additional information:

On FreeBSD 14.3, truss shows one sendto() per line. On FreeBSD 15.1, truss
shows a single sendto() containing all lines, indicating the regression occ=
urs
in daemon(8) before the messages reach syslog.

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