/*
Unix SMB/Netbios implementation.
SPOOLSS Daemon
- Copyright (C) Simo Sorce 2010
+ Copyright (C) Simo Sorce <idra@samba.org> 2010-2011
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
#include "rpc_server/spoolss/srv_spoolss_nt.h"
#include "librpc/rpc/dcerpc_ep.h"
#include "lib/server_prefork.h"
+#include "lib/server_prefork_util.h"
#define SPOOLSS_PIPE_NAME "spoolss"
#define DAEMON_NAME "spoolssd"
-#define SPOOLSS_MIN_CHILDREN 5
-#define SPOOLSS_MAX_CHILDREN 25
-#define SPOOLSS_SPAWN_RATE 5
-#define SPOOLSS_MIN_LIFE 60 /* 1 minute minimum life time */
-
-#define SPOOLSS_INIT 0x00
-#define SPOOLSS_NEW_MAX 0x01
-#define SPOLLSS_ENOSPC 0x02
-
-static struct prefork_pool *spoolss_pool;
-static int spoolss_min_children;
-static int spoolss_max_children;
-static int spoolss_spawn_rate;
-static int spoolss_prefork_status;
+static struct server_id parent_id;
+static struct prefork_pool *spoolss_pool = NULL;
static int spoolss_child_id = 0;
+static struct pf_daemon_config default_pf_spoolss_cfg = {
+ .prefork_status = PFH_INIT,
+ .min_children = 5,
+ .max_children = 25,
+ .spawn_rate = 5,
+ .max_allowed_clients = 100,
+ .child_min_life = 60 /* 1 minute minimum life time */
+};
+static struct pf_daemon_config pf_spoolss_cfg = { 0 };
+
pid_t start_spoolssd(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx);
-static void spoolss_prefork_config(void)
-{
- static int spoolss_prefork_config_init = false;
- const char *prefork_str;
- int min, max, rate;
- bool use_defaults = false;
- int ret;
-
- if (!spoolss_prefork_config_init) {
- spoolss_pool = NULL;
- spoolss_prefork_status = SPOOLSS_INIT;
- spoolss_min_children = 0;
- spoolss_max_children = 0;
- spoolss_spawn_rate = 0;
- spoolss_prefork_config_init = true;
- }
-
- prefork_str = lp_parm_const_string(GLOBAL_SECTION_SNUM,
- "spoolssd", "prefork", "none");
- if (strcmp(prefork_str, "none") == 0) {
- use_defaults = true;
- } else {
- ret = sscanf(prefork_str, "%d:%d:%d", &min, &max, &rate);
- if (ret != 3) {
- DEBUG(0, ("invalid format for spoolssd:prefork!\n"));
- use_defaults = true;
- }
- }
-
- if (use_defaults) {
- min = SPOOLSS_MIN_CHILDREN;
- max = SPOOLSS_MAX_CHILDREN;
- rate = SPOOLSS_SPAWN_RATE;
- }
-
- if (max > spoolss_max_children && spoolss_max_children != 0) {
- spoolss_prefork_status |= SPOOLSS_NEW_MAX;
- }
-
- spoolss_min_children = min;
- spoolss_max_children = max;
- spoolss_spawn_rate = rate;
-}
-
static void spoolss_reopen_logs(int child_id)
{
char *lfile = lp_logfile();
int rc;
if (child_id) {
- rc = asprintf(&ext, ".%s.%d", DAEMON_NAME, child_id);
+ rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
} else {
- rc = asprintf(&ext, ".%s", DAEMON_NAME);
+ rc = asprintf(&ext, "%s", DAEMON_NAME);
}
if (rc == -1) {
- /* if we can't allocate, set it to NULL
- * and logging will flow in the original file */
- ext = NULL;
+ return;
}
rc = 0;
if (lfile == NULL || lfile[0] == '\0') {
- rc = asprintf(&lfile, "%s/log%s",
- get_dyn_LOGFILEBASE(), ext?ext:"");
+ rc = asprintf(&lfile, "%s/log.%s",
+ get_dyn_LOGFILEBASE(), ext);
} else {
- if (ext && strstr(lfile, ext) == NULL) {
- if (strstr(lfile, DAEMON_NAME) == NULL) {
- rc = asprintf(&lfile, "%s%s",
- lp_logfile(), ext?ext:"");
- } else {
+ if (strstr(lfile, ext) == NULL) {
+ if (child_id) {
rc = asprintf(&lfile, "%s.%d",
lp_logfile(), child_id);
+ } else {
+ rc = asprintf(&lfile, "%s.%s",
+ lp_logfile(), ext);
}
}
}
{
change_to_root_user();
lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
- reload_printers(ev, msg);
+ load_printers(ev, msg);
spoolss_reopen_logs(spoolss_child_id);
if (spoolss_child_id == 0) {
- spoolss_prefork_config();
+ pfh_daemon_config(DAEMON_NAME,
+ &pf_spoolss_cfg,
+ &default_pf_spoolss_cfg);
+ pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
}
}
struct messaging_context *msg_ctx)
{
change_to_root_user();
- reload_printers(ev_ctx, msg_ctx);
+ delete_and_reload_printers(ev_ctx, msg_ctx);
}
static void pcap_updated(struct messaging_context *msg,
/* Children */
-struct spoolss_chld_sig_hup_ctx {
- struct messaging_context *msg_ctx;
- struct pf_worker_data *pf;
-};
-
static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
void *siginfo,
void *pvt)
{
- struct spoolss_chld_sig_hup_ctx *shc;
-
- shc = talloc_get_type_abort(pvt, struct spoolss_chld_sig_hup_ctx);
+ struct messaging_context *msg_ctx;
- /* avoid wasting CPU cycles if we are going to exit soon anyways */
- if (shc->pf != NULL &&
- shc->pf->cmds == PF_SRV_MSG_EXIT) {
- return;
- }
+ msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
change_to_root_user();
DEBUG(1,("Reloading printers after SIGHUP\n"));
- reload_printers(ev, shc->msg_ctx);
+ load_printers(ev, msg_ctx);
spoolss_reopen_logs(spoolss_child_id);
}
struct messaging_context *msg_ctx,
struct pf_worker_data *pf)
{
- struct spoolss_chld_sig_hup_ctx *shc;
struct tevent_signal *se;
- shc = talloc(ev_ctx, struct spoolss_chld_sig_hup_ctx);
- if (!shc) {
- DEBUG(1, ("failed to setup SIGHUP handler"));
- return false;
- }
- shc->pf = pf;
- shc->msg_ctx = msg_ctx;
-
se = tevent_add_signal(ev_ctx,
ev_ctx,
SIGHUP, 0,
spoolss_chld_sig_hup_handler,
- shc);
+ msg_ctx);
if (!se) {
DEBUG(1, ("failed to setup SIGHUP handler"));
return false;
return true;
}
+static void parent_ping(struct messaging_context *msg_ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+
+ /* The fact we received this message is enough to let make the event
+ * loop if it was idle. spoolss_children_main will cycle through
+ * spoolss_next_client at least once. That function will take whatever
+ * action is necessary */
+
+ DEBUG(10, ("Got message that the parent changed status.\n"));
+ return;
+}
+
static bool spoolss_child_init(struct tevent_context *ev_ctx,
int child_id, struct pf_worker_data *pf)
{
NTSTATUS status;
struct rpc_srv_callbacks spoolss_cb;
- struct messaging_context *msg_ctx = server_messaging_context();
+ struct messaging_context *msg_ctx = messaging_init(NULL, ev_ctx);
bool ok;
status = reinit_after_fork(msg_ctx, ev_ctx,
- procid_self(), true);
+ true);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("reinit_after_fork() failed\n"));
smb_panic("reinit_after_fork() failed");
MSG_SMB_CONF_UPDATED, smb_conf_updated);
messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
pcap_updated);
+ messaging_register(msg_ctx, ev_ctx,
+ MSG_PREFORK_PARENT_EVENT, parent_ping);
/* As soon as messaging is up check if pcap has been loaded already.
* If so then we probably missed a message and should load_printers()
struct pf_worker_data *pf;
int listen_fd_size;
int *listen_fds;
- int lock_fd;
-
- bool listening;
};
static void spoolss_next_client(void *pvt);
int child_id,
int listen_fd_size,
int *listen_fds,
- int lock_fd,
void *private_data)
{
struct spoolss_children_data *data;
data->pf = pf;
data->ev_ctx = ev_ctx;
data->msg_ctx = msg_ctx;
- data->lock_fd = lock_fd;
data->listen_fd_size = listen_fd_size;
data->listen_fds = listen_fds;
- data->listening = false;
/* loop until it is time to exit */
while (pf->status != PF_WORKER_EXITING) {
data = talloc_get_type_abort(pvt, struct spoolss_children_data);
- if (data->pf->num_clients) {
- data->pf->num_clients--;
- } else {
- DEBUG(2, ("Invalid num clients, aborting!\n"));
- data->pf->status = PF_WORKER_EXITING;
- return;
- }
+ pfh_client_terminated(data->pf);
spoolss_next_client(pvt);
}
data = talloc_get_type_abort(pvt, struct spoolss_children_data);
- if (data->pf->num_clients == 0) {
- data->pf->status = PF_WORKER_IDLE;
- }
-
- if (data->pf->cmds == PF_SRV_MSG_EXIT) {
- DEBUG(2, ("Parent process commands we terminate!\n"));
- return;
- }
-
- if (data->listening ||
- data->pf->num_clients >= data->pf->allowed_clients) {
+ if (!pfh_child_allowed_to_accept(data->pf)) {
/* nothing to do for now we are already listening
- * or reached the number of clients we are allowed
- * to handle in parallel */
+ * or we are not allowed to listen further */
return;
}
req = prefork_listen_send(next, data->ev_ctx, data->pf,
data->listen_fd_size,
- data->listen_fds,
- data->lock_fd);
+ data->listen_fds);
if (!req) {
DEBUG(1, ("Failed to make listening request!?\n"));
talloc_free(next);
return;
}
tevent_req_set_callback(req, spoolss_handle_client, next);
-
- data->listening = true;
}
static void spoolss_handle_client(struct tevent_req *req)
{
struct spoolss_children_data *data;
struct spoolss_new_client *client;
+ const DATA_BLOB ping = data_blob_null;
int ret;
int sd;
/* this will free the request too */
talloc_free(client);
- /* we are done listening */
- data->listening = false;
-
- if (ret > 0) {
- DEBUG(1, ("Failed to accept client connection!\n"));
- /* bail out if we are not serving any other client */
- if (data->pf->num_clients == 0) {
- data->pf->status = PF_WORKER_EXITING;
- }
- return;
- }
- if (ret == -2) {
- DEBUG(1, ("Server asks us to die!\n"));
- data->pf->status = PF_WORKER_EXITING;
+ if (ret != 0) {
+ DEBUG(6, ("No client connection was available after all!\n"));
return;
}
+ /* Warn parent that our status changed */
+ messaging_send(data->msg_ctx, parent_id,
+ MSG_PREFORK_CHILD_EVENT, &ping);
+
DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
(int)(data->pf->pid)));
extern pid_t background_lpq_updater_pid;
static char *bq_logfile;
-static void check_updater_child(void)
+static void check_updater_child(struct tevent_context *ev_ctx,
+ struct messaging_context *msg_ctx)
{
int status;
pid_t pid;
pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
if (pid > 0) {
DEBUG(2, ("The background queue child died... Restarting!\n"));
- pid = start_background_queue(server_event_context(),
- server_messaging_context(),
- bq_logfile);
+ pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
background_lpq_updater_pid = pid;
}
}
+static void child_ping(struct messaging_context *msg_ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+ struct tevent_context *ev_ctx;
+
+ ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
+
+ DEBUG(10, ("Got message that a child changed status.\n"));
+ pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
+}
+
static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct timeval current_time);
void *pvt)
{
struct messaging_context *msg_ctx;
- int active, total;
- int n, r;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
- /* now check we do not descend below the minimum */
- active = prefork_count_active_children(pfp, &total);
-
- n = 0;
- if (total < spoolss_min_children) {
- n = total - spoolss_min_children;
- } else if (total - active < (total / 4)) {
- n = spoolss_min_children;
- }
-
- if (n > 0) {
- r = prefork_add_children(ev_ctx, msg_ctx, pfp, n);
- if (r < n) {
- DEBUG(10, ("Tried to start %d children but only,"
- "%d were actually started.!\n", n, r));
- }
- }
+ /* run pool management so we can fork/retire or increase
+ * the allowed connections per child based on load */
+ pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
/* also check if the updater child is alive and well */
- check_updater_child();
+ check_updater_child(ev_ctx, msg_ctx);
}
static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
void *pvt)
{
struct messaging_context *msg_ctx;
- time_t now = time(NULL);
- int active, total;
- int ret, n;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
- if ((spoolss_prefork_status & SPOOLSS_NEW_MAX) &&
- !(spoolss_prefork_status & SPOLLSS_ENOSPC)) {
- ret = prefork_expand_pool(spoolss_pool, spoolss_max_children);
- if (ret == ENOSPC) {
- spoolss_prefork_status |= SPOLLSS_ENOSPC;
- }
- spoolss_prefork_status &= ~SPOOLSS_NEW_MAX;
- }
-
- active = prefork_count_active_children(spoolss_pool, &total);
-
- if (total - active < spoolss_spawn_rate) {
- n = prefork_add_children(ev_ctx, msg_ctx,
- spoolss_pool, spoolss_spawn_rate);
- if (n < spoolss_spawn_rate) {
- DEBUG(10, ("Tried to start 5 children but only,"
- "%d were actually started.!\n", n));
- }
- }
-
- if (total - active > spoolss_min_children) {
- if ((total - spoolss_min_children) >= spoolss_spawn_rate) {
- prefork_retire_children(spoolss_pool,
- spoolss_spawn_rate,
- now - SPOOLSS_MIN_LIFE);
- }
- }
+ pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
- ret = spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
+ spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
}
static void print_queue_forward(struct messaging_context *msg,
status = reinit_after_fork(msg_ctx,
ev_ctx,
- procid_self(), true);
+ true);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("reinit_after_fork() failed\n"));
smb_panic("reinit_after_fork() failed");
}
+ /* save the parent process id so the children can use it later */
+ parent_id = procid_self();
+
spoolss_reopen_logs(0);
- spoolss_prefork_config();
+ pfh_daemon_config(DAEMON_NAME,
+ &pf_spoolss_cfg,
+ &default_pf_spoolss_cfg);
spoolss_setup_sig_term_handler(ev_ctx);
spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
exit(1);
}
- ret = listen(listen_fd, spoolss_max_children);
+ ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
if (ret == -1) {
DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
strerror(errno)));
ok = prefork_create_pool(ev_ctx, /* mem_ctx */
ev_ctx, msg_ctx,
1, &listen_fd,
- spoolss_min_children,
- spoolss_max_children,
+ pf_spoolss_cfg.min_children,
+ pf_spoolss_cfg.max_children,
&spoolss_children_main, NULL,
&spoolss_pool);
+ if (!ok) {
+ exit(1);
+ }
if (!serverid_register(procid_self(),
FLAG_MSG_GENERAL |
- FLAG_MSG_SMBD |
FLAG_MSG_PRINT_GENERAL)) {
exit(1);
}
print_queue_forward);
messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
pcap_updated);
+ messaging_register(msg_ctx, ev_ctx,
+ MSG_PREFORK_CHILD_EVENT, child_ping);
/* As soon as messaging is up check if pcap has been loaded already.
* If so then we probably missed a message and should load_printers()
DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
+ pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
+
/* loop forever */
ret = tevent_loop_wait(ev_ctx);
/* should not be reached */
- DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
+ DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
ret, (ret == 0) ? "out of events" : strerror(errno)));
exit(1);
}
git.samba.org / mat / samba.git / blobdiff