rebase events to tevent and align to upstream

1 files changed, 0 insertions, 291 deletions

diff --git a/events/events_signal.c b/events/events_signal.c
deleted file mode 100644
index 652df53d..00000000
--- a/events/events_signal.c
+++ /dev/null
@@ -1,291 +0,0 @@
-/* 
-   Unix SMB/CIFS implementation.
-
-   common events code for signal events
-
-   Copyright (C) Andrew Tridgell	2007
-   
-   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 <signal.h>
-#include "replace.h"
-#include "system/filesys.h"
-#include "system/select.h"
-#include "events.h"
-#include "events_internal.h"
-#include "events_util.h"
-
-#define NUM_SIGNALS 64
-
-/* maximum number of SA_SIGINFO signals to hold in the queue */
-#define SA_INFO_QUEUE_COUNT 10
-
-struct sigcounter {
-	uint32_t count;
-	uint32_t seen;
-};
-
-#define SIG_INCREMENT(s) (s).count++
-#define SIG_SEEN(s, n) (s).seen += (n)
-#define SIG_PENDING(s) ((s).seen != (s).count)
-
-
-/*
-  the poor design of signals means that this table must be static global
-*/
-static struct sig_state {
-	struct signal_event *sig_handlers[NUM_SIGNALS+1];
-	struct sigaction *oldact[NUM_SIGNALS+1];
-	struct sigcounter signal_count[NUM_SIGNALS+1];
-	struct sigcounter got_signal;
-	int pipe_hack[2];
-#ifdef SA_SIGINFO
-	/* with SA_SIGINFO we get quite a lot of info per signal */
-	siginfo_t *sig_info[NUM_SIGNALS+1];
-	struct sigcounter sig_blocked[NUM_SIGNALS+1];
-#endif
-} *sig_state;
-
-/*
-  return number of sigcounter events not processed yet
-*/
-static uint32_t sig_count(struct sigcounter s)
-{
-	if (s.count >= s.seen) {
-		return s.count - s.seen;
-	}
-	return 1 + (0xFFFFFFFF & ~(s.seen - s.count));
-}
-
-/*
-  signal handler - redirects to registered signals
-*/
-static void signal_handler(int signum)
-{
-	char c = 0;
-	SIG_INCREMENT(sig_state->signal_count[signum]);
-	SIG_INCREMENT(sig_state->got_signal);
-	/* doesn't matter if this pipe overflows */
-	write(sig_state->pipe_hack[1], &c, 1);
-}
-
-#ifdef SA_SIGINFO
-/*
-  signal handler with SA_SIGINFO - redirects to registered signals
-*/
-static void signal_handler_info(int signum, siginfo_t *info, void *uctx)
-{
-	uint32_t count = sig_count(sig_state->signal_count[signum]);
-	sig_state->sig_info[signum][count] = *info;
-
-	signal_handler(signum);
-
-	/* handle SA_SIGINFO */
-	if (count+1 == SA_INFO_QUEUE_COUNT) {
-		/* we've filled the info array - block this signal until
-		   these ones are delivered */
-		sigset_t set;
-		sigemptyset(&set);
-		sigaddset(&set, signum);
-		sigprocmask(SIG_BLOCK, &set, NULL);
-		SIG_INCREMENT(sig_state->sig_blocked[signum]);
-	}
-}
-#endif
-
-/*
-  destroy a signal event
-*/
-static int signal_event_destructor(struct signal_event *se)
-{
-	se->event_ctx->num_signal_handlers--;
-	DLIST_REMOVE(sig_state->sig_handlers[se->signum], se);
-	if (sig_state->sig_handlers[se->signum] == NULL) {
-		/* restore old handler, if any */
-		sigaction(se->signum, sig_state->oldact[se->signum], NULL);
-		sig_state->oldact[se->signum] = NULL;
-#ifdef SA_SIGINFO
-		if (se->sa_flags & SA_SIGINFO) {
-			talloc_free(sig_state->sig_info[se->signum]);
-			sig_state->sig_info[se->signum] = NULL;
-		}
-#endif
-	}
-	return 0;
-}
-
-/*
-  this is part of the pipe hack needed to avoid the signal race condition
-*/
-static void signal_pipe_handler(struct event_context *ev, struct fd_event *fde, 
-				uint16_t flags, void *private)
-{
-	char c[16];
-	/* its non-blocking, doesn't matter if we read too much */
-	read(sig_state->pipe_hack[0], c, sizeof(c));
-}
-
-/*
-  add a signal event
-  return NULL on failure (memory allocation error)
-*/
-struct signal_event *common_event_add_signal(struct event_context *ev, 
-					     TALLOC_CTX *mem_ctx,
-					     int signum,
-					     int sa_flags,
-					     event_signal_handler_t handler, 
-					     void *private_data) 
-{
-	struct signal_event *se;
-
-	if (signum >= NUM_SIGNALS) {
-		return NULL;
-	}
-
-	/* the sig_state needs to be on a global context as it can last across
-	   multiple event contexts */
-	if (sig_state == NULL) {
-		sig_state = talloc_zero(talloc_autofree_context(), struct sig_state);
-		if (sig_state == NULL) {
-			return NULL;
-		}
-	}
-
-	se = talloc(mem_ctx?mem_ctx:ev, struct signal_event);
-	if (se == NULL) return NULL;
-
-	se->event_ctx		= ev;
-	se->handler		= handler;
-	se->private_data	= private_data;
-	se->signum              = signum;
-	se->sa_flags            = sa_flags;
-	
-	/* Ensure, no matter the destruction order, that we always have a handle on the global sig_state */
-	if (!talloc_reference(se, sig_state)) {
-		return NULL;
-	}
-
-	/* only install a signal handler if not already installed */
-	if (sig_state->sig_handlers[signum] == NULL) {
-		struct sigaction act;
-		ZERO_STRUCT(act);
-		act.sa_handler   = signal_handler;
-		act.sa_flags = sa_flags;
-#ifdef SA_SIGINFO
-		if (sa_flags & SA_SIGINFO) {
-			act.sa_handler   = NULL;
-			act.sa_sigaction = signal_handler_info;
-			if (sig_state->sig_info[signum] == NULL) {
-				sig_state->sig_info[signum] = talloc_array(sig_state, siginfo_t, SA_INFO_QUEUE_COUNT);
-				if (sig_state->sig_info[signum] == NULL) {
-					talloc_free(se);
-					return NULL;
-				}
-			}
-		}
-#endif
-		sig_state->oldact[signum] = talloc(sig_state, struct sigaction);
-		if (sig_state->oldact[signum] == NULL) {
-			talloc_free(se);
-			return NULL;			
-		}
-		if (sigaction(signum, &act, sig_state->oldact[signum]) == -1) {
-			talloc_free(se);
-			return NULL;
-		}
-	}
-
-	DLIST_ADD(sig_state->sig_handlers[signum], se);
-
-	talloc_set_destructor(se, signal_event_destructor);
-
-	/* we need to setup the pipe hack handler if not already
-	   setup */
-	if (ev->pipe_fde == NULL) {
-		if (sig_state->pipe_hack[0] == 0 && 
-		    sig_state->pipe_hack[1] == 0) {
-			pipe(sig_state->pipe_hack);
-			ev_set_blocking(sig_state->pipe_hack[0], false);
-			ev_set_blocking(sig_state->pipe_hack[1], false);
-		}
-		ev->pipe_fde = event_add_fd(ev, ev, sig_state->pipe_hack[0],
-					    EVENT_FD_READ, signal_pipe_handler, NULL);
-	}
-	ev->num_signal_handlers++;
-
-	return se;
-}
-
-
-/*
-  check if a signal is pending
-  return != 0 if a signal was pending
-*/
-int common_event_check_signal(struct event_context *ev)
-{
-	int i;
-
-	if (!sig_state || !SIG_PENDING(sig_state->got_signal)) {
-		return 0;
-	}
-	
-	for (i=0;i<NUM_SIGNALS+1;i++) {
-		struct signal_event *se, *next;
-		struct sigcounter counter = sig_state->signal_count[i];
-		uint32_t count = sig_count(counter);
-
-		if (count == 0) {
-			continue;
-		}
-		for (se=sig_state->sig_handlers[i];se;se=next) {
-			next = se->next;
-#ifdef SA_SIGINFO
-			if (se->sa_flags & SA_SIGINFO) {
-				int j;
-				for (j=0;j<count;j++) {
-					/* note the use of the sig_info array as a
-					   ring buffer */
-					int ofs = ((count-1) + j) % SA_INFO_QUEUE_COUNT;
-					se->handler(ev, se, i, 1, 
-						    (void*)&sig_state->sig_info[i][ofs], 
-						    se->private_data);
-				}
-				if (SIG_PENDING(sig_state->sig_blocked[i])) {
-					/* we'd filled the queue, unblock the
-					   signal now */
-					sigset_t set;
-					sigemptyset(&set);
-					sigaddset(&set, i);
-					SIG_SEEN(sig_state->sig_blocked[i], 
-						 sig_count(sig_state->sig_blocked[i]));
-					sigprocmask(SIG_UNBLOCK, &set, NULL);
-				}
-				if (se->sa_flags & SA_RESETHAND) {
-					talloc_free(se);
-				}
-				continue;
-			}
-#endif
-			se->handler(ev, se, i, count, NULL, se->private_data);
-			if (se->sa_flags & SA_RESETHAND) {
-				talloc_free(se);
-			}
-		}
-		SIG_SEEN(sig_state->signal_count[i], count);
-		SIG_SEEN(sig_state->got_signal, count);
-	}
-
-	return 1;
-}