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-rw-r--r--ctdb/common/system.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/ctdb/common/system.c b/ctdb/common/system.c
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--- /dev/null
+++ b/ctdb/common/system.c
@@ -0,0 +1,237 @@
+/*
+ common system utilities
+
+ Copyright (C) Amitay Isaacs 2014
+ Copyright (C) Martin Schwenke 2014
+
+ 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 "replace.h"
+#include "system/filesys.h"
+#include "system/shmem.h"
+#include "system/network.h"
+
+#include <talloc.h>
+#include <libgen.h>
+
+#include "lib/util/debug.h"
+
+#include "protocol/protocol.h"
+
+#include "common/logging.h"
+#include "common/system.h"
+
+#ifdef HAVE_SCHED_H
+#include <sched.h>
+#endif
+
+#ifdef HAVE_PROCINFO_H
+#include <procinfo.h>
+#endif
+
+/*
+ if possible, make this task real time
+ */
+bool set_scheduler(void)
+{
+#ifdef _AIX_
+#ifdef 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 false;
+ }
+
+ if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
+ DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
+ strerror(errno)));
+ return false;
+ } else {
+ return true;
+ }
+#endif
+#else /* no AIX */
+#ifdef HAVE_SCHED_SETSCHEDULER
+ struct sched_param p;
+
+ 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)));
+ return false;
+ } else {
+ return true;
+ }
+#endif
+#endif
+ DEBUG(DEBUG_CRIT,("No way to set real-time priority.\n"));
+ return false;
+}
+
+/*
+ reset scheduler from real-time to normal scheduling
+ */
+void reset_scheduler(void)
+{
+#ifdef _AIX_
+#ifdef 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"));
+ }
+ if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
+ DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
+ }
+#endif
+#else /* no AIX */
+#ifdef HAVE_SCHED_SETSCHEDULER
+ struct sched_param p;
+
+ p.sched_priority = 0;
+ if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
+ DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
+ }
+#endif
+#endif
+}
+
+/* we don't lock future pages here; it would increase the chance that
+ * we'd fail to mmap later on. */
+void lockdown_memory(bool valgrinding)
+{
+#if defined(HAVE_MLOCKALL) && !defined(_AIX_)
+ /* Extra stack, please! */
+ char dummy[10000];
+ memset(dummy, 0, sizeof(dummy));
+
+ if (valgrinding) {
+ return;
+ }
+
+ /* 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
+}
+
+void ctdb_wait_for_process_to_exit(pid_t pid)
+{
+ while (kill(pid, 0) == 0 || errno != ESRCH) {
+ sleep(5);
+ }
+}
+
+#ifdef HAVE_IF_NAMEINDEX
+
+bool ctdb_sys_check_iface_exists(const char *iface)
+{
+ struct if_nameindex *ifnis, *ifni;
+ bool found = false;
+
+ ifnis = if_nameindex();
+ if (ifnis == NULL) {
+ DBG_ERR("Failed to retrieve inteface list\n");
+ return false;
+ }
+
+ for (ifni = ifnis;
+ ifni->if_index != 0 || ifni->if_name != NULL;
+ ifni++) {
+ int cmp = strcmp(iface, ifni->if_name);
+ if (cmp == 0) {
+ found = true;
+ goto done;
+ }
+ }
+
+done:
+ if_freenameindex(ifnis);
+
+ return found;
+}
+
+#else /* HAVE_IF_NAMEINDEX */
+
+bool ctdb_sys_check_iface_exists(const char *iface)
+{
+ /* Not implemented: Interface always considered present */
+ return true;
+}
+
+#endif /* HAVE_IF_NAMEINDEX */
+
+#ifdef HAVE_PEERCRED
+
+int ctdb_get_peer_pid(const int fd, pid_t *peer_pid)
+{
+ struct ucred cr;
+ socklen_t crl = sizeof(struct ucred);
+ int ret;
+
+ ret = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &crl);
+ if (ret == 0) {
+ *peer_pid = cr.pid;
+ } else {
+ *peer_pid = -1;
+ }
+ return ret;
+}
+
+#else /* HAVE_PEERCRED */
+
+#ifdef _AIX_
+
+int ctdb_get_peer_pid(const int fd, pid_t *peer_pid)
+{
+ struct peercred_struct cr;
+ socklen_t crl = sizeof(struct peercred_struct);
+ int ret;
+
+ ret = getsockopt(fd, SOL_SOCKET, SO_PEERID, &cr, &crl);
+ if (ret == 0) {
+ *peer_pid = cr.pid;
+ } else {
+ *peer_pid = -1;
+ }
+ return ret;
+}
+
+#else /* _AIX_ */
+
+int ctdb_get_peer_pid(const int fd, pid_t *peer_pid)
+{
+ /* Not implemented */
+ *peer_pid = -1;
+ return ENOSYS;
+}
+
+#endif /* _AIX_ */
+
+#endif /* HAVE_PEERCRED */