Merge branch 'master' of ctdb into 'master' of samba

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>

1 files changed, 827 insertions, 0 deletions

diff --git a/ctdb/common/ctdb_util.c b/ctdb/common/ctdb_util.c
new file mode 100644
index 0000000000..7a70fea9cd
--- /dev/null
+++ b/ctdb/common/ctdb_util.c
@@ -0,0 +1,827 @@
+/* 
+   ctdb utility code
+
+   Copyright (C) Andrew Tridgell  2006
+
+   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 "includes.h"
+#include "tdb.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "system/wait.h"
+#include "system/shmem.h"
+#include "../include/ctdb_private.h"
+
+int LogLevel = DEBUG_NOTICE;
+int this_log_level = 0;
+
+/*
+  return error string for last error
+*/
+const char *ctdb_errstr(struct ctdb_context *ctdb)
+{
+	return ctdb->err_msg;
+}
+
+
+/*
+  remember an error message
+*/
+void ctdb_set_error(struct ctdb_context *ctdb, const char *fmt, ...)
+{
+	va_list ap;
+	talloc_free(ctdb->err_msg);
+	va_start(ap, fmt);
+	ctdb->err_msg = talloc_vasprintf(ctdb, fmt, ap);
+	DEBUG(DEBUG_ERR,("ctdb error: %s\n", ctdb->err_msg));
+	va_end(ap);
+}
+
+/*
+  a fatal internal error occurred - no hope for recovery
+*/
+void ctdb_fatal(struct ctdb_context *ctdb, const char *msg)
+{
+	DEBUG(DEBUG_ALERT,("ctdb fatal error: %s\n", msg));
+	abort();
+}
+
+/*
+  like ctdb_fatal() but a core/backtrace would not be useful
+*/
+void ctdb_die(struct ctdb_context *ctdb, const char *msg)
+{
+	DEBUG(DEBUG_ALERT,("ctdb exiting with error: %s\n", msg));
+	exit(1);
+}
+
+/* Invoke an external program to do some sort of tracing on the CTDB
+ * process.  This might block for a little while.  The external
+ * program is specified by the environment variable
+ * CTDB_EXTERNAL_TRACE.  This program should take one argument: the
+ * pid of the process to trace.  Commonly, the program would be a
+ * wrapper script around gcore.
+ */
+void ctdb_external_trace(void)
+{
+
+	const char * t = getenv("CTDB_EXTERNAL_TRACE");
+	char * cmd;
+
+	if (t == NULL) {
+		return;
+	}
+
+	cmd = talloc_asprintf(NULL, "%s %lu", t, (unsigned long) getpid());
+	DEBUG(DEBUG_WARNING,("begin external trace: %s\n", cmd));
+	system(cmd);
+	DEBUG(DEBUG_WARNING,("end external trace: %s\n", cmd));
+	talloc_free(cmd);
+}
+
+/*
+  parse a IP:port pair
+*/
+int ctdb_parse_address(struct ctdb_context *ctdb,
+		       TALLOC_CTX *mem_ctx, const char *str,
+		       struct ctdb_address *address)
+{
+	struct servent *se;
+
+	setservent(0);
+	se = getservbyname("ctdb", "tcp");
+	endservent();
+	
+	address->address = talloc_strdup(mem_ctx, str);
+	CTDB_NO_MEMORY(ctdb, address->address);
+
+	if (se == NULL) {
+		address->port = CTDB_PORT;
+	} else {
+		address->port = ntohs(se->s_port);
+	}
+	return 0;
+}
+
+
+/*
+  check if two addresses are the same
+*/
+bool ctdb_same_address(struct ctdb_address *a1, struct ctdb_address *a2)
+{
+	return strcmp(a1->address, a2->address) == 0 && a1->port == a2->port;
+}
+
+
+/*
+  hash function for mapping data to a VNN - taken from tdb
+*/
+uint32_t ctdb_hash(const TDB_DATA *key)
+{
+	return tdb_jenkins_hash(discard_const(key));
+}
+
+/*
+  a type checking varient of idr_find
+ */
+static void *_idr_find_type(struct idr_context *idp, int id, const char *type, const char *location)
+{
+	void *p = idr_find(idp, id);
+	if (p && talloc_check_name(p, type) == NULL) {
+		DEBUG(DEBUG_ERR,("%s idr_find_type expected type %s  but got %s\n",
+			 location, type, talloc_get_name(p)));
+		return NULL;
+	}
+	return p;
+}
+
+uint32_t ctdb_reqid_new(struct ctdb_context *ctdb, void *state)
+{
+	int id = idr_get_new_above(ctdb->idr, state, ctdb->lastid+1, INT_MAX);
+	if (id < 0) {
+		DEBUG(DEBUG_DEBUG, ("Reqid wrap!\n"));
+		id = idr_get_new(ctdb->idr, state, INT_MAX);
+	}
+	ctdb->lastid = id;
+	return id;
+}
+
+void *_ctdb_reqid_find(struct ctdb_context *ctdb, uint32_t reqid, const char *type, const char *location)
+{
+	void *p;
+
+	p = _idr_find_type(ctdb->idr, reqid, type, location);
+	if (p == NULL) {
+		DEBUG(DEBUG_WARNING, ("Could not find idr:%u\n",reqid));
+	}
+
+	return p;
+}
+
+
+void ctdb_reqid_remove(struct ctdb_context *ctdb, uint32_t reqid)
+{
+	int ret;
+
+	ret = idr_remove(ctdb->idr, reqid);
+	if (ret != 0) {
+		DEBUG(DEBUG_ERR, ("Removing idr that does not exist\n"));
+	}
+}
+
+
+/*
+  form a ctdb_rec_data record from a key/data pair
+  
+  note that header may be NULL. If not NULL then it is included in the data portion
+  of the record
+ */
+struct ctdb_rec_data *ctdb_marshall_record(TALLOC_CTX *mem_ctx, uint32_t reqid,	
+					   TDB_DATA key, 
+					   struct ctdb_ltdb_header *header,
+					   TDB_DATA data)
+{
+	size_t length;
+	struct ctdb_rec_data *d;
+
+	length = offsetof(struct ctdb_rec_data, data) + key.dsize + 
+		data.dsize + (header?sizeof(*header):0);
+	d = (struct ctdb_rec_data *)talloc_size(mem_ctx, length);
+	if (d == NULL) {
+		return NULL;
+	}
+	d->length = length;
+	d->reqid = reqid;
+	d->keylen = key.dsize;
+	memcpy(&d->data[0], key.dptr, key.dsize);
+	if (header) {
+		d->datalen = data.dsize + sizeof(*header);
+		memcpy(&d->data[key.dsize], header, sizeof(*header));
+		memcpy(&d->data[key.dsize+sizeof(*header)], data.dptr, data.dsize);
+	} else {
+		d->datalen = data.dsize;
+		memcpy(&d->data[key.dsize], data.dptr, data.dsize);
+	}
+	return d;
+}
+
+
+/* helper function for marshalling multiple records */
+struct ctdb_marshall_buffer *ctdb_marshall_add(TALLOC_CTX *mem_ctx, 
+					       struct ctdb_marshall_buffer *m,
+					       uint64_t db_id,
+					       uint32_t reqid,
+					       TDB_DATA key,
+					       struct ctdb_ltdb_header *header,
+					       TDB_DATA data)
+{
+	struct ctdb_rec_data *r;
+	size_t m_size, r_size;
+	struct ctdb_marshall_buffer *m2;
+
+	r = ctdb_marshall_record(mem_ctx, reqid, key, header, data);
+	if (r == NULL) {
+		talloc_free(m);
+		return NULL;
+	}
+
+	if (m == NULL) {
+		m = talloc_zero_size(mem_ctx, offsetof(struct ctdb_marshall_buffer, data));
+		if (m == NULL) {
+			return NULL;
+		}
+		m->db_id = db_id;
+	}
+
+	m_size = talloc_get_size(m);
+	r_size = talloc_get_size(r);
+
+	m2 = talloc_realloc_size(mem_ctx, m,  m_size + r_size);
+	if (m2 == NULL) {
+		talloc_free(m);
+		return NULL;
+	}
+
+	memcpy(m_size + (uint8_t *)m2, r, r_size);
+
+	talloc_free(r);
+
+	m2->count++;
+
+	return m2;
+}
+
+/* we've finished marshalling, return a data blob with the marshalled records */
+TDB_DATA ctdb_marshall_finish(struct ctdb_marshall_buffer *m)
+{
+	TDB_DATA data;
+	data.dptr = (uint8_t *)m;
+	data.dsize = talloc_get_size(m);
+	return data;
+}
+
+/* 
+   loop over a marshalling buffer 
+   
+     - pass r==NULL to start
+     - loop the number of times indicated by m->count
+*/
+struct ctdb_rec_data *ctdb_marshall_loop_next(struct ctdb_marshall_buffer *m, struct ctdb_rec_data *r,
+					      uint32_t *reqid,
+					      struct ctdb_ltdb_header *header,
+					      TDB_DATA *key, TDB_DATA *data)
+{
+	if (r == NULL) {
+		r = (struct ctdb_rec_data *)&m->data[0];
+	} else {
+		r = (struct ctdb_rec_data *)(r->length + (uint8_t *)r);
+	}
+
+	if (reqid != NULL) {
+		*reqid = r->reqid;
+	}
+	
+	if (key != NULL) {
+		key->dptr   = &r->data[0];
+		key->dsize  = r->keylen;
+	}
+	if (data != NULL) {
+		data->dptr  = &r->data[r->keylen];
+		data->dsize = r->datalen;
+		if (header != NULL) {
+			data->dptr += sizeof(*header);
+			data->dsize -= sizeof(*header);
+		}
+	}
+
+	if (header != NULL) {
+		if (r->datalen < sizeof(*header)) {
+			return NULL;
+		}
+		*header = *(struct ctdb_ltdb_header *)&r->data[r->keylen];
+	}
+
+	return r;
+}
+
+
+#if HAVE_SCHED_H
+#include <sched.h>
+#endif
+
+#if HAVE_PROCINFO_H
+#include <procinfo.h>
+#endif
+
+/*
+  if possible, make this task real time
+ */
+void ctdb_set_scheduler(struct ctdb_context *ctdb)
+{
+#ifdef _AIX_
+#if HAVE_THREAD_SETSCHED
+	struct thrdentry64 te;
+	tid64_t ti;
+
+	ti = 0ULL;
+	if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
+		DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
+		return;
+	}
+
+	if (ctdb->saved_scheduler_param == NULL) {
+		ctdb->saved_scheduler_param = talloc_size(ctdb, sizeof(te));
+	}
+	*(struct thrdentry64 *)ctdb->saved_scheduler_param = te;
+
+	if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
+		DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
+				  strerror(errno)));
+	} else {
+		DEBUG(DEBUG_NOTICE, ("Set scheduler to SCHED_RR\n"));
+	}
+#endif
+#else /* no AIX */
+#if HAVE_SCHED_SETSCHEDULER
+	struct sched_param p;
+	if (ctdb->saved_scheduler_param == NULL) {
+		ctdb->saved_scheduler_param = talloc_size(ctdb, sizeof(p));
+	}
+
+	if (sched_getparam(0, (struct sched_param *)ctdb->saved_scheduler_param) == -1) {
+		DEBUG(DEBUG_ERR,("Unable to get old scheduler params\n"));
+		return;
+	}
+
+	p = *(struct sched_param *)ctdb->saved_scheduler_param;
+	p.sched_priority = 1;
+
+	if (sched_setscheduler(0, SCHED_FIFO, &p) == -1) {
+		DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n", 
+			 strerror(errno)));
+	} else {
+		DEBUG(DEBUG_NOTICE,("Set scheduler to SCHED_FIFO\n"));
+	}
+#endif
+#endif
+}
+
+/*
+  restore previous scheduler parameters
+ */
+void ctdb_restore_scheduler(struct ctdb_context *ctdb)
+{
+#ifdef _AIX_
+#if HAVE_THREAD_SETSCHED
+	struct thrdentry64 te, *saved;
+	tid64_t ti;
+
+	ti = 0ULL;
+	if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
+		ctdb_fatal(ctdb, "Unable to get thread information\n");
+	}
+	if (ctdb->saved_scheduler_param == NULL) {
+		ctdb_fatal(ctdb, "No saved scheduler parameters\n");
+	}
+	saved = (struct thrdentry64 *)ctdb->saved_scheduler_param;
+	if (thread_setsched(te.ti_tid, saved->ti_pri, saved->ti_policy) == -1) {
+		ctdb_fatal(ctdb, "Unable to restore old scheduler parameters\n");
+	}
+#endif
+#else /* no AIX */
+#if HAVE_SCHED_SETSCHEDULER
+	if (ctdb->saved_scheduler_param == NULL) {
+		ctdb_fatal(ctdb, "No saved scheduler parameters\n");
+	}
+	if (sched_setscheduler(0, SCHED_OTHER, (struct sched_param *)ctdb->saved_scheduler_param) == -1) {
+		ctdb_fatal(ctdb, "Unable to restore old scheduler parameters\n");
+	}
+#endif
+#endif
+}
+
+void set_nonblocking(int fd)
+{
+	unsigned v;
+	v = fcntl(fd, F_GETFL, 0);
+        fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+void set_close_on_exec(int fd)
+{
+	unsigned v;
+	v = fcntl(fd, F_GETFD, 0);
+	fcntl(fd, F_SETFD, v | FD_CLOEXEC);
+}
+
+
+bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
+{
+	sin->sin_family = AF_INET;
+	sin->sin_port   = htons(port);
+
+	if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
+		DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
+		return false;
+	}
+
+	return true;
+}
+
+static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
+{
+	saddr->ip6.sin6_family   = AF_INET6;
+	saddr->ip6.sin6_port     = htons(port);
+	saddr->ip6.sin6_flowinfo = 0;
+	saddr->ip6.sin6_scope_id = 0;
+
+	if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
+		DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
+		return false;
+	}
+
+	if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
+		if (strchr(ifaces, ',')) {
+			DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
+					  "is specified for multiple ifaces %s\n",
+					  s, ifaces));
+			return false;
+		}
+		saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
+	}
+
+	return true;
+}
+/*
+  parse a ip:port pair
+ */
+bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(NULL);
+	char *s, *p;
+	unsigned port;
+	char *endp = NULL;
+	bool ret;
+
+	s = talloc_strdup(tmp_ctx, addr);
+	if (s == NULL) {
+		DEBUG(DEBUG_ERR, (__location__ " Failed strdup()\n"));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+
+	p = rindex(s, ':');
+	if (p == NULL) {
+		DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+
+	port = strtoul(p+1, &endp, 10);
+	if (endp == NULL || *endp != 0) {
+		/* trailing garbage */
+		DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+	*p = 0;
+
+
+	/* now is this a ipv4 or ipv6 address ?*/
+	ret = parse_ip(s, NULL, port, saddr);
+
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+/*
+  parse an ip
+ */
+bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
+{
+	char *p;
+	bool ret;
+
+	ZERO_STRUCTP(saddr); /* valgrind :-) */
+
+	/* now is this a ipv4 or ipv6 address ?*/
+	p = index(addr, ':');
+	if (p == NULL) {
+		ret = parse_ipv4(addr, port, &saddr->ip);
+	} else {
+		ret = parse_ipv6(addr, ifaces, port, saddr);
+	}
+
+	return ret;
+}
+
+/*
+  parse a ip/mask pair
+ */
+bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
+{
+	TALLOC_CTX *tmp_ctx = talloc_new(NULL);
+	char *s, *p;
+	char *endp = NULL;
+	bool ret;
+
+	ZERO_STRUCT(*addr);
+	s = talloc_strdup(tmp_ctx, str);
+	if (s == NULL) {
+		DEBUG(DEBUG_ERR, (__location__ " Failed strdup()\n"));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+
+	p = rindex(s, '/');
+	if (p == NULL) {
+		DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+
+	*mask = strtoul(p+1, &endp, 10);
+	if (endp == NULL || *endp != 0) {
+		/* trailing garbage */
+		DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
+		talloc_free(tmp_ctx);
+		return false;
+	}
+	*p = 0;
+
+
+	/* now is this a ipv4 or ipv6 address ?*/
+	ret = parse_ip(s, ifaces, 0, addr);
+
+	talloc_free(tmp_ctx);
+	return ret;
+}
+
+/*
+   This is used to canonicalize a ctdb_sock_addr structure.
+*/
+void ctdb_canonicalize_ip(const ctdb_sock_addr *ip, ctdb_sock_addr *cip)
+{
+	char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
+
+	memcpy(cip, ip, sizeof (*cip));
+
+	if ( (ip->sa.sa_family == AF_INET6)
+	&& !memcmp(&ip->ip6.sin6_addr, prefix, 12)) {
+		memset(cip, 0, sizeof(*cip));
+#ifdef HAVE_SOCK_SIN_LEN
+		cip->ip.sin_len = sizeof(*cip);
+#endif
+		cip->ip.sin_family = AF_INET;
+		cip->ip.sin_port   = ip->ip6.sin6_port;
+		memcpy(&cip->ip.sin_addr, &ip->ip6.sin6_addr.s6_addr[12], 4);
+	}
+}
+
+bool ctdb_same_ip(const ctdb_sock_addr *tip1, const ctdb_sock_addr *tip2)
+{
+	ctdb_sock_addr ip1, ip2;
+
+	ctdb_canonicalize_ip(tip1, &ip1);
+	ctdb_canonicalize_ip(tip2, &ip2);
+	
+	if (ip1.sa.sa_family != ip2.sa.sa_family) {
+		return false;
+	}
+
+	switch (ip1.sa.sa_family) {
+	case AF_INET:
+		return ip1.ip.sin_addr.s_addr == ip2.ip.sin_addr.s_addr;
+	case AF_INET6:
+		return !memcmp(&ip1.ip6.sin6_addr.s6_addr[0],
+				&ip2.ip6.sin6_addr.s6_addr[0],
+				16);
+	default:
+		DEBUG(DEBUG_ERR, (__location__ " CRITICAL Can not compare sockaddr structures of type %u\n", ip1.sa.sa_family));
+		return false;
+	}
+
+	return true;
+}
+
+/*
+  compare two ctdb_sock_addr structures
+ */
+bool ctdb_same_sockaddr(const ctdb_sock_addr *ip1, const ctdb_sock_addr *ip2)
+{
+	return ctdb_same_ip(ip1, ip2) && ip1->ip.sin_port == ip2->ip.sin_port;
+}
+
+char *ctdb_addr_to_str(ctdb_sock_addr *addr)
+{
+	static char cip[128] = "";
+
+	switch (addr->sa.sa_family) {
+	case AF_INET:
+		inet_ntop(addr->ip.sin_family, &addr->ip.sin_addr, cip, sizeof(cip));
+		break;
+	case AF_INET6:
+		inet_ntop(addr->ip6.sin6_family, &addr->ip6.sin6_addr, cip, sizeof(cip));
+		break;
+	default:
+		DEBUG(DEBUG_ERR, (__location__ " ERROR, unknown family %u\n", addr->sa.sa_family));
+		ctdb_external_trace();
+	}
+
+	return cip;
+}
+
+unsigned ctdb_addr_to_port(ctdb_sock_addr *addr)
+{
+	switch (addr->sa.sa_family) {
+	case AF_INET:
+		return ntohs(addr->ip.sin_port);
+		break;
+	case AF_INET6:
+		return ntohs(addr->ip6.sin6_port);
+		break;
+	default:
+		DEBUG(DEBUG_ERR, (__location__ " ERROR, unknown family %u\n", addr->sa.sa_family));
+	}
+
+	return 0;
+}
+
+void ctdb_block_signal(int signum)
+{
+	sigset_t set;
+	sigemptyset(&set);
+	sigaddset(&set,signum);
+	sigprocmask(SIG_BLOCK,&set,NULL);
+}
+
+void ctdb_unblock_signal(int signum)
+{
+	sigset_t set;
+	sigemptyset(&set);
+	sigaddset(&set,signum);
+	sigprocmask(SIG_UNBLOCK,&set,NULL);
+}
+
+struct debug_levels debug_levels[] = {
+	{DEBUG_EMERG,	"EMERG"},
+	{DEBUG_ALERT,	"ALERT"},
+	{DEBUG_CRIT,	"CRIT"},
+	{DEBUG_ERR,	"ERR"},
+	{DEBUG_WARNING,	"WARNING"},
+	{DEBUG_NOTICE,	"NOTICE"},
+	{DEBUG_INFO,	"INFO"},
+	{DEBUG_DEBUG,	"DEBUG"},
+	{0, NULL}
+};
+
+const char *get_debug_by_level(int32_t level)
+{
+	int i;
+
+	for (i=0; debug_levels[i].description != NULL; i++) {
+		if (debug_levels[i].level == level) {
+			return debug_levels[i].description;
+		}
+	}
+	return "Unknown";
+}
+
+int32_t get_debug_by_desc(const char *desc)
+{
+	int i;
+
+	for (i=0; debug_levels[i].description != NULL; i++) {
+		if (!strcasecmp(debug_levels[i].description, desc)) {
+			return debug_levels[i].level;
+		}
+	}
+
+	return DEBUG_ERR;
+}
+
+/* we don't lock future pages here; it would increase the chance that
+ * we'd fail to mmap later on. */
+void ctdb_lockdown_memory(struct ctdb_context *ctdb)
+{
+#ifdef HAVE_MLOCKALL
+	/* Extra stack, please! */
+	char dummy[10000];
+	memset(dummy, 0, sizeof(dummy));
+
+	if (ctdb->valgrinding) {
+		return;
+	}
+
+	/* TODO: Add a command line option to disable memory lockdown.
+	 *       This can be a performance issue on AIX since fork() copies
+	 *       all locked memory pages. 
+	 */
+
+	/* Ignore when running in local daemons mode */
+	if (getuid() != 0) {
+		return;
+	}
+
+	/* Avoid compiler optimizing out dummy. */
+	mlock(dummy, sizeof(dummy));
+	if (mlockall(MCL_CURRENT) != 0) {
+		DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
+				     strerror(errno)));
+	}
+#endif
+}
+
+const char *ctdb_eventscript_call_names[] = {
+	"init",
+	"setup",
+	"startup",
+	"startrecovery",
+	"recovered",
+	"takeip",
+	"releaseip",
+	"stopped",
+	"monitor",
+	"status",
+	"shutdown",
+	"reload",
+	"updateip",
+	"ipreallocated"
+};
+
+/* Runstate handling */
+static struct {
+	enum ctdb_runstate runstate;
+	const char * label;
+} runstate_map[] = {
+	{ CTDB_RUNSTATE_UNKNOWN, "UNKNOWN" },
+	{ CTDB_RUNSTATE_INIT, "INIT" },
+	{ CTDB_RUNSTATE_SETUP, "SETUP" },
+	{ CTDB_RUNSTATE_FIRST_RECOVERY, "FIRST_RECOVERY" },
+	{ CTDB_RUNSTATE_STARTUP, "STARTUP" },
+	{ CTDB_RUNSTATE_RUNNING, "RUNNING" },
+	{ CTDB_RUNSTATE_SHUTDOWN, "SHUTDOWN" },
+	{ -1, NULL },
+};
+
+const char *runstate_to_string(enum ctdb_runstate runstate)
+{
+	int i;
+	for (i=0; runstate_map[i].label != NULL ; i++) {
+		if (runstate_map[i].runstate == runstate) {
+			return runstate_map[i].label;
+		}
+	}
+
+	return runstate_map[0].label;
+}
+
+enum ctdb_runstate runstate_from_string(const char *label)
+{
+	int i;
+	for (i=0; runstate_map[i].label != NULL; i++) {
+		if (strcasecmp(runstate_map[i].label, label) == 0) {
+			return runstate_map[i].runstate;
+		}
+	}
+
+	return CTDB_RUNSTATE_UNKNOWN;
+}
+
+void ctdb_set_runstate(struct ctdb_context *ctdb, enum ctdb_runstate runstate)
+{
+	if (runstate <= ctdb->runstate) {
+		ctdb_fatal(ctdb, "runstate must always increase");
+	}
+
+	DEBUG(DEBUG_NOTICE,("Set runstate to %s (%d)\n",
+			    runstate_to_string(runstate), runstate));
+	ctdb->runstate = runstate;
+}
+
+void ctdb_mkdir_p_or_die(struct ctdb_context *ctdb, const char *dir, int mode)
+{
+	int ret;
+
+	ret = mkdir_p(dir, mode);
+	if (ret != 0) {
+		DEBUG(DEBUG_ALERT,
+		      ("ctdb exiting with error: "
+		       "failed to create directory \"%s\" (%s)\n",
+		       dir, strerror(ret)));
+		exit(1);
+	}
+}