On Thursday, 25 August 2016 at 14:53:30 UTC, Shachar Shemesh
wrote:
On 25/08/16 11:46, FreeSlave wrote:
On Thursday, 25 August 2016 at 07:32:29 UTC, Shachar Shemesh
wrote:
On 24/08/16 14:04, FreeSlave wrote:
Are there plans on adding something like
spawnProcessDetached that would
start processes completely independent from parent? I.e. in
other
process group and, what is important, with no need for wait.
On Posix that could be done via double fork technique. Not
sure about
Windows.
Double fork on Posix is, usually, used for something slightly
different. In particular, since you bring up the process
group, I
think you mean daemonization.
Daemonization, however, does a bit more than create a new
process
group and double forking.
http://forum.dlang.org/thread/[email protected]
has
discussion and some code regarding this issue.
Shachar
It's not about daemonization only. Different process group is
needed to
prevent signal distribution. Again, e.g. file manager and
launched
application may want to not be connected in any way.
Yes, that's part of daemonization. So is chdir somewhere else
and closing all open file descriptors, including stdin/out/err.
http://0pointer.de/public/systemd-man/daemon.html#SysV%20Daemons
It's part of daemonization, but again, I'm not talking
specifically about daemons. I'm talking about spawning of
detached process (you may think about it as daemonization, but
with less/different requirements)
Of course chdir and file descriptors should be configurable.
E.g. file managers usually set working directory of process to
the path of executable.
When launching usual applications it's better to not close
standard file descriptors, but redirect them to /dev/null, since
real closing may break some apps.
Currently spawnProcess allows to set working directory and fds,
but it implies you call wait afterwards. It would be cool if
standard library provided the way to spawn process without
worrying about zombies. And yes, with enough options it could
provide support for full daemonization too (i.e. including
closing standard fds).
