[Bug 236117] /usr/sbin/daemon should support stdin,stdout,stderr redirect to files other than /dev/null

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236117

            Bug ID: 236117
           Summary: /usr/sbin/daemon should support stdin,stdout,stderr
                    redirect to files other than /dev/null
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: zhoutao at laocius.org

The daemon command has an option `-f`, which, according to the man page,
redirects stding,stdout,stderr to /dev/null.

This is fine. But if I cannot redirect stdin, stdout, stderr to different files
respectively.

There is a `-o` option, 

```
  -o output_file
             Append output from the daemonized process to output_file.  If the
             file does not exist, it is created with permissions 0600.
```

The problem I am having now is that daemon command was used in some freebsd
rc.d scripts without the `-f` option. When I try to restart those services
through python subprocess.Popen, it would hang indefinitely. 

The problem can be easily reproduced by 

```
python3 -c 'import subprocess; subprocess.Popen(["/usr/sbin/service",
"mytestservice", "onerestart"], stderr=subprocess.PIPE).communicate()'
```

I can add the `-f` option to fix the problem, but `-f` will override the `-o`
option, and I end up with no log at all.


I think it would be nice if the daemon command can support redirecting stdin,
stdout, stderr separately.

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