s3-prefork: implement prefork framework

Primarily built for forked off rpc service daemons, but not tied to rpc
services and generic enough to be used elsewhere easily.

Signed-off-by: Andreas Schneider <asn@samba.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/source3/lib/server_prefork.h b/source3/lib/server_prefork.h
new file mode 100644
index 0000000000..d6d7bf95c9
--- /dev/null
+++ b/source3/lib/server_prefork.h
@@ -0,0 +1,76 @@
+/*
+   Unix SMB/CIFS implementation.
+   Common server globals
+
+   Copyright (C) Simo Sorce <idra@samba.org> 2011
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "system/network.h"
+#include <tevent.h>
+
+enum pf_worker_status {
+	PF_WORKER_NONE = 0,
+	PF_WORKER_IDLE,
+	PF_WORKER_ACCEPTING,
+	PF_WORKER_BUSY,
+	PF_WORKER_EXITING
+};
+
+enum pf_server_cmds {
+	PF_SRV_MSG_NONE = 0,
+	PF_SRV_MSG_EXIT
+};
+
+struct pf_worker_data {
+	pid_t pid;
+	enum pf_worker_status status;
+	enum pf_server_cmds cmds;
+	time_t started;
+	time_t last_used;
+	int num_clients;
+};
+
+typedef int (prefork_main_fn_t)(struct tevent_context *ev,
+				struct pf_worker_data *pf,
+				int listen_fd,
+				int lock_fd,
+				void *private_data);
+
+struct prefork_pool;
+
+
+/* ==== Functions used by controlling process ==== */
+
+bool prefork_create_pool(struct tevent_context *ev_ctx,
+			 TALLOC_CTX *mem_ctx, int listen_fd,
+			 int min_children, int max_children,
+			 prefork_main_fn_t *main_fn, void *private_data,
+			 struct prefork_pool **pf_pool);
+
+int prefork_add_children(struct tevent_context *ev_ctx,
+			 struct prefork_pool *pfp,
+			 int num_children);
+int prefork_retire_children(struct prefork_pool *pfp,
+			    int num_children, time_t age_limit);
+int prefork_count_active_children(struct prefork_pool *pfp, int *total);
+bool prefork_mark_pid_dead(struct prefork_pool *pfp, pid_t pid);
+
+/* ==== Functions used by children ==== */
+
+int prefork_wait_for_client(struct pf_worker_data *pf,
+			    int lock_fd, int listen_fd,
+			    struct sockaddr *addr,
+			    socklen_t *addrlen, int *fd);