do_exec_pty(..)

[Damien Miller]

On Wed, 28 Feb 2001, Sunil K. Vallamkonda wrote:

> Hello,
>
> I see that incase of command execution:
> :fork()" is called twice, in sshd.
> Once to spin off child sshd from parenat and
> second from child sshd, to execute command.
> Due to this I see 3 processes being created
> for each connection viz:
>
> 16398  0.0  0.3  1284  892 ??  S     4:33PM    0:00.05 sshd:child
> 16399  0.0  0.1   320  232 p4  Is+   4:33PM    0:00.06 -sh -c foo_command
> 16401  0.0  0.3  2076  840 p4  S+    4:33PM    0:00.01 foo_command
>
> I may be missing something, but
> I was wondering to why second
> fork() is required to execute a command
> on server.
> To execute a command, the child sshd could execve(..).
> thus eliminate the need for second fork() and possibly
> simpler code path.

The first fork is because the long-term sshd process is acting much like
inetd. If you don't want it, then you can run sshd in inetd mode.

-d

-- 
| Damien Miller <djm at mindrot.org> \ ``E-mail attachments are the poor man's
| http://www.mindrot.org          /   distributed filesystem'' - Dan Geer