int listen_fd_size;
int *listen_fds;
- int lock_fd;
-
prefork_main_fn_t *main_fn;
void *private_data;
pfp->main_fn = main_fn;
pfp->private_data = private_data;
- pfp->lock_fd = create_unlink_tmp(NULL);
- if (pfp->lock_fd == -1) {
- DEBUG(1, ("Failed to create prefork lock fd!\n"));
- talloc_free(pfp);
- return false;
- }
-
pfp->pool_size = max_children;
data_size = sizeof(struct pf_worker_data) * max_children;
&pfp->pool[i], i + 1,
pfp->listen_fd_size,
pfp->listen_fds,
- pfp->lock_fd,
pfp->private_data);
exit(ret);
&pfp->pool[i], i + 1,
pfp->listen_fd_size,
pfp->listen_fds,
- pfp->lock_fd,
pfp->private_data);
pfp->pool[i].status = PF_WORKER_EXITING;
/* ==== Functions used by children ==== */
-static SIG_ATOMIC_T pf_alarm;
-
-static void pf_alarm_cb(int signum)
-{
- pf_alarm = 1;
-}
-
-
-/*
- * Parameters:
- * pf - the worker shared data structure
- * lock_fd - the file descriptor used for locking
- * timeout - expressed in seconds:
- * -1 never timeouts,
- * 0 timeouts immediately
- * N seconds before timing out
- *
- * Returns values:
- * negative errno on fatal error
- * 0 on success to acquire lock
- * -1 on timeout/lock held by other
- * -2 on server msg to terminate
- * ERRNO on other errors
- */
-
-static int prefork_grab_lock(struct pf_worker_data *pf,
- int lock_fd, int timeout)
-{
- struct flock lock;
- int op;
- int ret;
-
- if (pf->cmds == PF_SRV_MSG_EXIT) {
- return -2;
- }
-
- pf_alarm = 0;
-
- if (timeout > 0) {
- CatchSignal(SIGALRM, pf_alarm_cb);
- alarm(timeout);
- }
-
- if (timeout == 0) {
- op = F_SETLK;
- } else {
- op = F_SETLKW;
- }
-
- ret = 0;
- do {
- ZERO_STRUCT(lock);
- lock.l_type = F_WRLCK;
- lock.l_whence = SEEK_SET;
-
- ret = fcntl(lock_fd, op, &lock);
- if (ret == 0) break;
-
- ret = errno;
-
- if (pf->cmds == PF_SRV_MSG_EXIT) {
- ret = -2;
- goto done;
- }
-
- switch (ret) {
- case EINTR:
- break;
-
- case EACCES:
- case EAGAIN:
- /* lock held by other proc */
- ret = -1;
- goto done;
- default:
- goto done;
- }
-
- if (pf_alarm == 1) {
- /* timed out */
- ret = -1;
- goto done;
- }
- } while (timeout != 0);
-
- if (ret != 0) {
- /* We have the Lock */
- pf->status = PF_WORKER_ACCEPTING;
- }
-
-done:
- if (timeout > 0) {
- alarm(0);
- CatchSignal(SIGALRM, SIG_IGN);
- }
-
- if (ret > 0) {
- DEBUG(1, ("Failed to get lock (%d, %s)!\n",
- ret, strerror(ret)));
- }
- return ret;
-}
-
-/*
- * Parameters:
- * pf - the worker shared data structure
- * lock_fd - the file descriptor used for locking
- * timeout - expressed in seconds:
- * -1 never timeouts,
- * 0 timeouts immediately
- * N seconds before timing out
- *
- * Returns values:
- * negative errno on fatal error
- * 0 on success to release lock
- * -1 on timeout
- * ERRNO on error
- */
-
-static int prefork_release_lock(struct pf_worker_data *pf,
- int lock_fd, int timeout)
-{
- struct flock lock;
- int op;
- int ret;
-
- pf_alarm = 0;
-
- if (timeout > 0) {
- CatchSignal(SIGALRM, pf_alarm_cb);
- alarm(timeout);
- }
-
- if (timeout == 0) {
- op = F_SETLK;
- } else {
- op = F_SETLKW;
- }
-
- do {
- ZERO_STRUCT(lock);
- lock.l_type = F_UNLCK;
- lock.l_whence = SEEK_SET;
-
- ret = fcntl(lock_fd, op, &lock);
- if (ret == 0) break;
-
- ret = errno;
-
- if (ret != EINTR) {
- goto done;
- }
-
- if (pf_alarm == 1) {
- /* timed out */
- ret = -1;
- goto done;
- }
- } while (timeout != 0);
-
-done:
- if (timeout > 0) {
- alarm(0);
- CatchSignal(SIGALRM, SIG_IGN);
- }
-
- if (ret > 0) {
- DEBUG(1, ("Failed to release lock (%d, %s)!\n",
- ret, strerror(ret)));
- }
- return ret;
-}
-
-/* ==== async code ==== */
-
-#define PF_ASYNC_LOCK_GRAB 0x01
-#define PF_ASYNC_LOCK_RELEASE 0x02
-#define PF_ASYNC_ACTION_MASK 0x03
-#define PF_ASYNC_LOCK_DONE 0x04
-
-struct pf_lock_state {
- struct pf_worker_data *pf;
- int lock_fd;
- int flags;
-};
-
-static void prefork_lock_handler(struct tevent_context *ev,
- struct tevent_timer *te,
- struct timeval curtime, void *pvt);
-
-static struct tevent_req *prefork_lock_send(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev,
- struct pf_worker_data *pf,
- int lock_fd, int action)
-{
- struct tevent_req *req;
- struct pf_lock_state *state;
-
- req = tevent_req_create(mem_ctx, &state, struct pf_lock_state);
- if (!req) {
- return NULL;
- }
-
- state->pf = pf;
- state->lock_fd = lock_fd;
- state->flags = action;
-
- /* try once immediately */
- prefork_lock_handler(ev, NULL, tevent_timeval_zero(), req);
- if (state->flags & PF_ASYNC_LOCK_DONE) {
- tevent_req_post(req, ev);
- }
-
- return req;
-}
-
-static void prefork_lock_handler(struct tevent_context *ev,
- struct tevent_timer *te,
- struct timeval curtime, void *pvt)
-{
- struct tevent_req *req;
- struct pf_lock_state *state;
- struct timeval tv;
- int timeout = 0;
- int ret;
-
- req = talloc_get_type_abort(pvt, struct tevent_req);
- state = tevent_req_data(req, struct pf_lock_state);
-
- if (state->pf->num_clients > 0) {
- timeout = 1;
- }
-
- switch (state->flags & PF_ASYNC_ACTION_MASK) {
- case PF_ASYNC_LOCK_GRAB:
- ret = prefork_grab_lock(state->pf, state->lock_fd, timeout);
- break;
- case PF_ASYNC_LOCK_RELEASE:
- ret = prefork_release_lock(state->pf, state->lock_fd, timeout);
- break;
- default:
- ret = EINVAL;
- break;
- }
-
- switch (ret) {
- case 0:
- state->flags |= PF_ASYNC_LOCK_DONE;
- tevent_req_done(req);
- return;
- case -1:
- if (timeout) {
- tv = tevent_timeval_zero();
- } else {
- tv = tevent_timeval_current_ofs(0, 100000);
- }
- te = tevent_add_timer(ev, state, tv,
- prefork_lock_handler, req);
- tevent_req_nomem(te, req);
- return;
- case -2:
- /* server tells us to stop */
- state->flags |= PF_ASYNC_LOCK_DONE;
- tevent_req_error(req, -2);
- return;
- default:
- state->flags |= PF_ASYNC_LOCK_DONE;
- tevent_req_error(req, ret);
- return;
- }
-}
-
-static int prefork_lock_recv(struct tevent_req *req)
-{
- int ret;
-
- if (!tevent_req_is_unix_error(req, &ret)) {
- ret = 0;
- }
-
- tevent_req_received(req);
- return ret;
-}
-
struct pf_listen_state {
struct tevent_context *ev;
struct pf_worker_data *pf;
int listen_fd_size;
int *listen_fds;
- int lock_fd;
-
int accept_fd;
struct tsocket_address *srv_addr;
int error;
};
-static void prefork_listen_lock_done(struct tevent_req *subreq);
+struct pf_listen_ctx {
+ TALLOC_CTX *fde_ctx;
+ struct tevent_req *req;
+ int listen_fd;
+};
+
static void prefork_listen_accept_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *pvt);
-static void prefork_listen_release_done(struct tevent_req *subreq);
struct tevent_req *prefork_listen_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct pf_worker_data *pf,
int listen_fd_size,
- int *listen_fds,
- int lock_fd)
+ int *listen_fds)
{
- struct tevent_req *req, *subreq;
+ struct tevent_req *req;
struct pf_listen_state *state;
+ struct pf_listen_ctx *ctx;
+ struct tevent_fd *fde;
+ TALLOC_CTX *fde_ctx;
+ int i;
req = tevent_req_create(mem_ctx, &state, struct pf_listen_state);
if (!req) {
state->ev = ev;
state->pf = pf;
- state->lock_fd = lock_fd;
state->listen_fd_size = listen_fd_size;
state->listen_fds = listen_fds;
state->accept_fd = -1;
state->error = 0;
- subreq = prefork_lock_send(state, state->ev, state->pf,
- state->lock_fd, PF_ASYNC_LOCK_GRAB);
- if (tevent_req_nomem(subreq, req)) {
- return tevent_req_post(req, ev);
- }
-
- tevent_req_set_callback(subreq, prefork_listen_lock_done, req);
- return req;
-}
-
-struct pf_listen_ctx {
- TALLOC_CTX *fde_ctx;
- struct tevent_req *req;
- int listen_fd;
-};
-
-static void prefork_listen_lock_done(struct tevent_req *subreq)
-{
- struct tevent_req *req;
- struct pf_listen_state *state;
- struct pf_listen_ctx *ctx;
- struct tevent_fd *fde;
- TALLOC_CTX *fde_ctx;
- int ret;
- int i;
-
- req = tevent_req_callback_data(subreq, struct tevent_req);
- state = tevent_req_data(req, struct pf_listen_state);
-
- ret = prefork_lock_recv(subreq);
- if (ret != 0) {
- tevent_req_error(req, ret);
- return;
- }
-
fde_ctx = talloc_new(state);
if (tevent_req_nomem(fde_ctx, req)) {
- return;
+ return tevent_req_post(req, ev);
}
- /* next step, accept */
+ /* race on accept */
for (i = 0; i < state->listen_fd_size; i++) {
ctx = talloc(fde_ctx, struct pf_listen_ctx);
if (tevent_req_nomem(ctx, req)) {
- return;
+ return tevent_req_post(req, ev);
}
ctx->fde_ctx = fde_ctx;
ctx->req = req;
ctx->listen_fd, TEVENT_FD_READ,
prefork_listen_accept_handler, ctx);
if (tevent_req_nomem(fde, req)) {
- return;
+ return tevent_req_post(req, ev);
}
}
+
+ return req;
}
static void prefork_listen_accept_handler(struct tevent_context *ev,
uint16_t flags, void *pvt)
{
struct pf_listen_state *state;
- struct tevent_req *req, *subreq;
+ struct tevent_req *req;
struct pf_listen_ctx *ctx;
struct sockaddr_storage addr;
socklen_t addrlen;
int ret;
ctx = talloc_get_type_abort(pvt, struct pf_listen_ctx);
+ req = ctx->req;
state = tevent_req_data(ctx->req, struct pf_listen_state);
ZERO_STRUCT(addr);
addrlen = sizeof(addr);
sd = accept(ctx->listen_fd, (struct sockaddr *)&addr, &addrlen);
if (sd == -1) {
- if (errno == EINTR) {
- /* keep trying */
- return;
- }
err = errno;
DEBUG(6, ("Accept failed! (%d, %s)\n", err, strerror(err)));
}
/* do not track the listen fds anymore */
- req = ctx->req;
talloc_free(ctx->fde_ctx);
ctx = NULL;
if (err) {
}
done:
- /* release lock now */
- subreq = prefork_lock_send(state, state->ev, state->pf,
- state->lock_fd, PF_ASYNC_LOCK_RELEASE);
- if (tevent_req_nomem(subreq, req)) {
- return;
- }
- tevent_req_set_callback(subreq, prefork_listen_release_done, req);
-}
-
-static void prefork_listen_release_done(struct tevent_req *subreq)
-{
- struct tevent_req *req;
- int ret;
-
- req = tevent_req_callback_data(subreq, struct tevent_req);
-
- ret = prefork_lock_recv(subreq);
- if (ret != 0) {
- tevent_req_error(req, ret);
- return;
- }
-
tevent_req_done(req);
}
git.samba.org / amitay / samba.git / commitdiff