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/*
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 interface 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 */
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