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authorSimo Sorce <idra@samba.org>2011-04-21 15:06:18 -0400
committerAndreas Schneider <asn@samba.org>2011-08-10 18:14:03 +0200
commit1dd93f40c8ae22d4210e72df2bad60bf3e1da350 (patch)
treedc2e125c59070e024adefc3f85442d192b4ef96c /source3/printing
parenta1394fc934e91e5db31853a89e3ae9b67e5c76f6 (diff)
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s3-spoolssd: Use the prefork framework in spoolssd
This should make it more scalable and able to handle easily multiple clients at the same time. Signed-off-by: Andreas Schneider <asn@samba.org>
Diffstat (limited to 'source3/printing')
-rw-r--r--source3/printing/spoolssd.c428
1 files changed, 425 insertions, 3 deletions
diff --git a/source3/printing/spoolssd.c b/source3/printing/spoolssd.c
index 48509b3967..e7bee0e0eb 100644
--- a/source3/printing/spoolssd.c
+++ b/source3/printing/spoolssd.c
@@ -30,10 +30,16 @@
#include "rpc_server/rpc_ep_register.h"
#include "rpc_server/spoolss/srv_spoolss_nt.h"
#include "librpc/rpc/dcerpc_ep.h"
+#include "lib/server_prefork.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 */
+
void start_spoolssd(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx);
@@ -105,10 +111,11 @@ static void spoolss_sig_hup_handler(struct tevent_context *ev,
int signum,
int count,
void *siginfo,
- void *private_data)
+ void *pvt)
{
- struct messaging_context *msg_ctx = talloc_get_type_abort(private_data,
- struct messaging_context);
+ struct messaging_context *msg_ctx;
+
+ msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
change_to_root_user();
DEBUG(1,("Reloading printers after SIGHUP\n"));
@@ -146,15 +153,400 @@ static bool spoolss_shutdown_cb(void *ptr)
return true;
}
+/* Childrens */
+
+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,
+ int count,
+ void *siginfo,
+ void *pvt)
+{
+ struct spoolss_chld_sig_hup_ctx *shc;
+
+ shc = talloc_get_type_abort(pvt, struct spoolss_chld_sig_hup_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;
+ }
+
+ change_to_root_user();
+ DEBUG(1,("Reloading printers after SIGHUP\n"));
+ reload_printers(ev, shc->msg_ctx);
+ spoolss_reopen_logs();
+}
+
+static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
+ struct pf_worker_data *pf,
+ struct messaging_context *msg_ctx)
+{
+ 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);
+ if (!se) {
+ DEBUG(1, ("failed to setup SIGHUP handler"));
+ return false;
+ }
+
+ return true;
+}
+
+static bool spoolss_child_init(struct tevent_context *ev_ctx,
+ struct pf_worker_data *pf)
+{
+ NTSTATUS status;
+ struct rpc_srv_callbacks spoolss_cb;
+ struct messaging_context *msg_ctx = server_messaging_context();
+ bool ok;
+
+ status = reinit_after_fork(msg_ctx, ev_ctx,
+ procid_self(), true);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("reinit_after_fork() failed\n"));
+ smb_panic("reinit_after_fork() failed");
+ }
+
+ spoolss_reopen_logs();
+
+ ok = spoolss_setup_chld_hup_handler(ev_ctx, pf, msg_ctx);
+ if (!ok) {
+ return false;
+ }
+
+ if (!serverid_register(procid_self(), FLAG_MSG_GENERAL)) {
+ return false;
+ }
+
+ if (!locking_init()) {
+ return false;
+ }
+
+ messaging_register(msg_ctx, ev_ctx,
+ MSG_SMB_CONF_UPDATED, smb_conf_updated);
+
+ /* try to reinit rpc queues */
+ spoolss_cb.init = spoolss_init_cb;
+ spoolss_cb.shutdown = spoolss_shutdown_cb;
+ spoolss_cb.private_data = msg_ctx;
+
+ status = rpc_winreg_init(NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
+ nt_errstr(status)));
+ return false;
+ }
+
+ status = rpc_spoolss_init(&spoolss_cb);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
+ nt_errstr(status)));
+ return false;
+ }
+
+ reload_printers(ev_ctx, msg_ctx);
+
+ return true;
+}
+
+struct spoolss_children_data {
+ struct tevent_context *ev_ctx;
+ struct messaging_context *msg_ctx;
+ struct pf_worker_data *pf;
+ int listen_fd;
+ int lock_fd;
+};
+
+static void spoolss_schedule_loop(void *pvt);
+static void spoolss_children_loop(struct tevent_context *ev_ctx,
+ struct tevent_immediate *im,
+ void *pvt);
+
+static int spoolss_children_main(struct tevent_context *ev_ctx,
+ struct pf_worker_data *pf,
+ int listen_fd, int lock_fd,
+ void *private_data)
+{
+ struct messaging_context *msg_ctx = server_messaging_context();
+ struct spoolss_children_data *data;
+ bool ok;
+ int ret;
+
+ ok = spoolss_child_init(ev_ctx, pf);
+ if (!ok) {
+ return 1;
+ }
+
+ data = talloc(ev_ctx, struct spoolss_children_data);
+ if (!data) {
+ return 1;
+ }
+ data->pf = pf;
+ data->ev_ctx = ev_ctx;
+ data->msg_ctx = msg_ctx;
+ data->lock_fd = lock_fd;
+ data->listen_fd = listen_fd;
+
+ spoolss_schedule_loop(data);
+
+ /* loop until it is time to exit */
+ while (pf->status != PF_WORKER_EXITING) {
+ ret = tevent_loop_once(ev_ctx);
+ if (ret != 0) {
+ DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
+ ret, strerror(errno)));
+ pf->status = PF_WORKER_EXITING;
+ }
+ }
+
+ return ret;
+}
+
+static void spoolss_client_terminated(void *pvt)
+{
+ struct spoolss_children_data *data;
+
+ 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;
+ }
+
+ spoolss_schedule_loop(pvt);
+}
+
+static void spoolss_schedule_loop(void *pvt)
+{
+ struct spoolss_children_data *data;
+ struct tevent_immediate *im;
+
+ 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;
+ }
+
+ im = tevent_create_immediate(data);
+ if (!im) {
+ DEBUG(1, ("Failed to create immediate event!\n"));
+ return;
+ }
+
+ tevent_schedule_immediate(im, data->ev_ctx,
+ spoolss_children_loop, data);
+}
+
+static void spoolss_children_loop(struct tevent_context *ev_ctx,
+ struct tevent_immediate *im,
+ void *pvt)
+{
+ struct spoolss_children_data *data;
+ struct sockaddr_un sunaddr;
+ socklen_t addrlen = sizeof(sunaddr);
+ int ret;
+ int sd;
+
+ data = talloc_get_type_abort(pvt, struct spoolss_children_data);
+
+
+ /* FIXME: this call is blocking. */
+ ret = prefork_wait_for_client(data->pf, data->lock_fd, data->listen_fd,
+ (struct sockaddr *)(void *)&sunaddr,
+ &addrlen, &sd);
+ if (ret > 0) {
+ DEBUG(1, ("Failed to accept connection!\n"));
+ return;
+ }
+
+ if (ret == -2) {
+ DEBUG(1, ("Server asks us to die!\n"));
+ data->pf->status = PF_WORKER_EXITING;
+ return;
+ }
+
+ DEBUG(2, ("Spoolss preforked child %d activated!\n",
+ (int)(data->pf->pid)));
+
+ named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
+ SPOOLSS_PIPE_NAME, sd,
+ spoolss_client_terminated, data);
+}
+
+/* ==== Main Process Functions ==== */
+
+static void spoolssd_sig_chld_handler(struct tevent_context *ev_ctx,
+ struct tevent_signal *se,
+ int signum, int count,
+ void *siginfo, void *pvt)
+{
+ struct prefork_pool *pfp;
+ pid_t pid;
+ int status;
+ bool ok;
+ int active, total;
+ int n, r;
+
+ pfp = talloc_get_type_abort(pvt, struct prefork_pool);
+
+ while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
+ ok = prefork_mark_pid_dead(pfp, pid);
+ if (!ok) {
+ DEBUG(1, ("Pid %d was not found in children pool!\n",
+ (int)pid));
+ }
+ }
+
+ /* now check we do not descent 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, pfp, n);
+ if (r < n) {
+ DEBUG(10, ("Tried to start %d children but only,"
+ "%d were actually started.!\n", n, r));
+ }
+ }
+
+
+}
+
+static bool spoolssd_setup_sig_chld_handler(struct tevent_context *ev_ctx,
+ struct prefork_pool *pfp)
+{
+ struct tevent_signal *se;
+
+ se = tevent_add_signal(ev_ctx, ev_ctx, SIGCHLD, 0,
+ spoolssd_sig_chld_handler, pfp);
+ if (!se) {
+ DEBUG(0, ("Failed to setup SIGCHLD handler!\n"));
+ return false;
+ }
+
+ return true;
+}
+
+static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
+ struct prefork_pool *pfp,
+ struct timeval current_time);
+static void spoolssd_check_children(struct tevent_context *ev_ctx,
+ struct tevent_timer *te,
+ struct timeval current_time,
+ void *pvt);
+
+static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
+ struct prefork_pool *pfp)
+{
+ bool ok;
+
+ ok = spoolssd_setup_sig_chld_handler(ev_ctx, pfp);
+ if (!ok) {
+ return false;
+ }
+
+ ok = spoolssd_schedule_check(ev_ctx, pfp, tevent_timeval_current());
+ return ok;
+}
+
+static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
+ struct prefork_pool *pfp,
+ struct timeval current_time)
+{
+ struct tevent_timer *te;
+ struct timeval next_event;
+
+ /* check situation again in 10 seconds */
+ next_event = tevent_timeval_current_ofs(10, 0);
+
+ /* check when the socket becomes readable, so that children
+ * are checked only when there is some activity */
+ te = tevent_add_timer(ev_ctx, pfp, next_event,
+ spoolssd_check_children, pfp);
+ if (!te) {
+ DEBUG(2, ("Failed to set up children monitoring!\n"));
+ return false;
+ }
+
+ return true;
+}
+
+static void spoolssd_check_children(struct tevent_context *ev_ctx,
+ struct tevent_timer *te,
+ struct timeval current_time,
+ void *pvt)
+{
+ struct prefork_pool *pfp;
+ int active, total;
+ int ret, n;
+
+ pfp = talloc_get_type_abort(pvt, struct prefork_pool);
+
+ active = prefork_count_active_children(pfp, &total);
+
+ if (total - active < SPOOLSS_SPAWN_RATE) {
+ n = prefork_add_children(ev_ctx, pfp, 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(pfp, SPOOLSS_SPAWN_RATE,
+ time(NULL) - SPOOLSS_MIN_LIFE);
+ }
+ }
+
+ ret = spoolssd_schedule_check(ev_ctx, pfp, current_time);
+}
+
void start_spoolssd(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
+ struct prefork_pool *pool;
struct rpc_srv_callbacks spoolss_cb;
struct dcerpc_binding_vector *v;
TALLOC_CTX *mem_ctx;
pid_t pid;
NTSTATUS status;
+ int listen_fd;
int ret;
+ bool ok;
DEBUG(1, ("Forking SPOOLSS Daemon\n"));
@@ -184,6 +576,28 @@ void start_spoolssd(struct tevent_context *ev_ctx,
spoolss_reopen_logs();
+ /* the listening fd must be created before the children are actually
+ * forked out. */
+ listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
+ if (listen_fd == -1) {
+ exit(1);
+ }
+
+ ret = listen(listen_fd, SPOOLSS_MAX_CHILDREN);
+ if (ret == -1) {
+ DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
+ strerror(errno)));
+ exit(1);
+ }
+
+
+ /* start children before any more initialization is done */
+ ok = prefork_create_pool(ev_ctx, ev_ctx, listen_fd,
+ SPOOLSS_MIN_CHILDREN,
+ SPOOLSS_MAX_CHILDREN,
+ &spoolss_children_main, NULL,
+ &pool);
+
spoolss_setup_sig_term_handler(ev_ctx);
spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
@@ -253,6 +667,14 @@ void start_spoolssd(struct tevent_context *ev_ctx,
talloc_free(mem_ctx);
+ ok = spoolssd_setup_children_monitor(ev_ctx, pool);
+ if (!ok) {
+ DEBUG(0, ("Failed to setup children monitoring!\n"));
+ exit(1);
+ }
+
+ reload_printers(ev_ctx, msg_ctx);
+
DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
/* loop forever */