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s3:smbd: let smbd/nmbd/winbindd child processes terminate if the parent process died.

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This applies to all child processes making use of reinit_after_fork().
It is implemented by establishing a pipe between parent and child.
The child watches for EOF on the read end of the pipe, indidcating
an exited parent.

Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
This commit is contained in:
Michael Adam
2012-03-15 16:29:27 +01:00
parent e5ebe67e38
commit c80f70390c
5 changed files with 92 additions and 0 deletions
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13
source3/smbd/server.c
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@ -57,6 +57,8 @@ struct smbd_parent_context {
/* the list of current child processes */
struct smbd_child_pid *children;
size_t num_children;
/* pipe for detecting death of parent process in child: */
int child_pipe[2];
struct timed_event *cleanup_te;
};
@ -1231,6 +1233,17 @@ extern void build_options(bool screen);
exit(1);
}
/*
* Do not initialize the parent-child-pipe before becoming
* a daemon: this is used to detect a died parent in the child
* process.
*/
status = init_before_fork();
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("init_before_fork failed: %s\n", nt_errstr(status)));
exit(1);
}
smbd_server_conn->msg_ctx = msg_ctx;
parent = talloc_zero(ev_ctx, struct smbd_parent_context);