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+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow 1997-2003
+ * Copyright (C) John G. Hasler 2009
+ * Copyright (C) Miroslav Lichvar 2009-2012, 2014-2018
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ **********************************************************************
+
+ =======================================================================
+
+ This module is for POSIX compliant operating systems.
+
+ */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include <sys/utsname.h>
+
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
+#include <pthread.h>
+#include <sched.h>
+#endif
+
+#if defined(HAVE_MLOCKALL)
+#include <sys/mman.h>
+#endif
+#if defined(HAVE_SETRLIMIT_MEMLOCK)
+#include <sys/resource.h>
+#endif
+
+#include "sys_posix.h"
+#include "conf.h"
+#include "local.h"
+#include "logging.h"
+#include "util.h"
+
+/* ================================================== */
+
+#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
+/* Install SCHED_FIFO real-time scheduler with specified priority */
+void
+SYS_Posix_SetScheduler(int priority)
+{
+ struct sched_param sched;
+ int pmax, pmin;
+
+ if (priority < 1 || priority > 99)
+ LOG_FATAL("Bad scheduler priority: %d", priority);
+
+ sched.sched_priority = priority;
+ pmax = sched_get_priority_max(SCHED_FIFO);
+ pmin = sched_get_priority_min(SCHED_FIFO);
+ if (priority > pmax) {
+ sched.sched_priority = pmax;
+ } else if (priority < pmin) {
+ sched.sched_priority = pmin;
+ }
+
+ if (pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched) < 0) {
+ LOG(LOGS_ERR, "pthread_setschedparam() failed");
+ } else {
+ DEBUG_LOG("Enabled SCHED_FIFO with priority %d", sched.sched_priority);
+ }
+}
+#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
+
+/* ================================================== */
+
+#if defined(HAVE_MLOCKALL)
+/* Lock the process into RAM so that it will never be swapped out */
+void
+SYS_Posix_MemLockAll(void)
+{
+#if defined(HAVE_SETRLIMIT_MEMLOCK)
+ struct rlimit rlim;
+
+ /* Ensure we can reserve as much as we need */
+ rlim.rlim_max = RLIM_INFINITY;
+ rlim.rlim_cur = RLIM_INFINITY;
+ if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
+ LOG(LOGS_ERR, "setrlimit() failed");
+ return;
+ }
+#endif
+
+ if (mlockall(MCL_CURRENT|MCL_FUTURE) < 0) {
+ LOG(LOGS_ERR, "mlockall() failed");
+ } else {
+ DEBUG_LOG("Successfully locked into RAM");
+ }
+}
+#endif /* HAVE_MLOCKALL */