Bug 236117 - /usr/sbin/daemon should support stdin,stdout,stderr redirect to files other than /dev/null
Summary: /usr/sbin/daemon should support stdin,stdout,stderr redirect to files other t...
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: 11.2-STABLE
Hardware: Any Any
: --- Affects Some People
Assignee: freebsd-bugs (Nobody)
Keywords: feature
Depends on:
Reported: 2019-03-01 01:06 UTC by TAO ZHOU
Modified: 2020-02-12 20:26 UTC (History)
2 users (show)

See Also:


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Description TAO ZHOU 2019-03-01 01:06:59 UTC
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.