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samba-mirror/ctdb/common/system_util.c
Martin Schwenke 1be8564e55 ctdb-common: Use SCHED_RESET_ON_FORK when setting SCHED_FIFO
This makes the scheduler reset code a no-op.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

Autobuild-User(master): Amitay Isaacs <amitay@samba.org>
Autobuild-Date(master): Mon Jul  7 13:28:25 CEST 2014 on sn-devel-104
2014-07-07 13:28:25 +02:00

372 lines
7.8 KiB
C

/*
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 "includes.h"
#include "system/filesys.h"
#include "system/shmem.h"
#include <libgen.h>
#if HAVE_SCHED_H
#include <sched.h>
#endif
#if HAVE_PROCINFO_H
#include <procinfo.h>
#endif
/*
if possible, make this task real time
*/
void set_scheduler(void)
{
#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 (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;
int policy = SCHED_FIFO;
p.sched_priority = 1;
#ifdef SCHED_RESET_ON_FORK
policy |= SCHED_RESET_ON_FORK;
#endif
if (sched_setscheduler(0, policy, &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
}
/*
reset scheduler from real-time to normal scheduling
*/
void reset_scheduler(void)
{
#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"));
}
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 */
#if HAVE_SCHED_SETSCHEDULER
#ifndef SCHED_RESET_ON_FORK
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
#endif
}
void set_nonblocking(int fd)
{
int v;
v = fcntl(fd, F_GETFL, 0);
if (v == -1) {
DEBUG(DEBUG_WARNING, ("Failed to get file status flags - %s\n",
strerror(errno)));
return;
}
if (fcntl(fd, F_SETFL, v | O_NONBLOCK) == -1) {
DEBUG(DEBUG_WARNING, ("Failed to set non_blocking on fd - %s\n",
strerror(errno)));
}
}
void set_close_on_exec(int fd)
{
int v;
v = fcntl(fd, F_GETFD, 0);
if (v == -1) {
DEBUG(DEBUG_WARNING, ("Failed to get file descriptor flags - %s\n",
strerror(errno)));
return;
}
if (fcntl(fd, F_SETFD, v | FD_CLOEXEC) != 0) {
DEBUG(DEBUG_WARNING, ("Failed to set close_on_exec on fd - %s\n",
strerror(errno)));
}
}
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 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)
{
char *p;
char s[64]; /* Much longer than INET6_ADDRSTRLEN */
char *endp = NULL;
ssize_t len;
bool ret;
ZERO_STRUCT(*addr);
len = strlen(str);
if (len >= sizeof(s)) {
DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
return false;
}
strncpy(s, str, len+1);
p = rindex(s, '/');
if (p == NULL) {
DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
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));
return false;
}
*p = 0;
/* now is this a ipv4 or ipv6 address ?*/
ret = parse_ip(s, ifaces, 0, addr);
return ret;
}
/*
parse a ip:port pair
*/
bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
{
char *p;
char s[64]; /* Much longer than INET6_ADDRSTRLEN */
unsigned port;
char *endp = NULL;
ssize_t len;
bool ret;
len = strlen(addr);
if (len >= sizeof(s)) {
DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
return false;
}
strncpy(s, addr, len+1);
p = rindex(s, ':');
if (p == NULL) {
DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
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));
return false;
}
*p = 0;
/* now is this a ipv4 or ipv6 address ?*/
ret = parse_ip(s, NULL, port, saddr);
return ret;
}
/* 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
}
int mkdir_p(const char *dir, int mode)
{
char t[PATH_MAX];
ssize_t len;
int ret;
if (strcmp(dir, "/") == 0) {
return 0;
}
if (strcmp(dir, ".") == 0) {
return 0;
}
/* Try to create directory */
ret = mkdir(dir, mode);
/* Succeed if that worked or if it already existed */
if (ret == 0 || errno == EEXIST) {
return 0;
}
/* Fail on anything else except ENOENT */
if (errno != ENOENT) {
return ret;
}
/* Create ancestors */
len = strlen(dir);
if (len >= PATH_MAX) {
errno = ENAMETOOLONG;
return -1;
}
strncpy(t, dir, len+1);
ret = mkdir_p(dirname(t), mode);
if (ret != 0) {
return ret;
}
/* Create directory */
ret = mkdir(dir, mode);
if ((ret == -1) && (errno == EEXIST)) {
ret = 0;
}
return ret;
}
void mkdir_p_or_die(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(errno)));
exit(1);
}
}