2 common system utilities
4 Copyright (C) Amitay Isaacs 2014
5 Copyright (C) Martin Schwenke 2014
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include "system/filesys.h"
23 #include "system/shmem.h"
37 if possible, make this task real time
39 void set_scheduler(void)
42 #if HAVE_THREAD_SETSCHED
43 struct thrdentry64 te;
47 if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
48 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
52 if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
53 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
56 DEBUG(DEBUG_NOTICE, ("Set scheduler to SCHED_RR\n"));
60 #if HAVE_SCHED_SETSCHEDULER
62 int policy = SCHED_FIFO;
66 #ifdef SCHED_RESET_ON_FORK
67 policy |= SCHED_RESET_ON_FORK;
69 if (sched_setscheduler(0, policy, &p) == -1) {
70 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
73 DEBUG(DEBUG_NOTICE,("Set scheduler to SCHED_FIFO\n"));
80 reset scheduler from real-time to normal scheduling
82 void reset_scheduler(void)
85 #if HAVE_THREAD_SETSCHED
86 struct thrdentry64 te;
90 if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
91 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
93 if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
94 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
98 #if HAVE_SCHED_SETSCHEDULER
99 #ifndef SCHED_RESET_ON_FORK
100 struct sched_param p;
102 p.sched_priority = 0;
103 if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
104 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
111 void set_nonblocking(int fd)
115 v = fcntl(fd, F_GETFL, 0);
117 DEBUG(DEBUG_WARNING, ("Failed to get file status flags - %s\n",
121 if (fcntl(fd, F_SETFL, v | O_NONBLOCK) == -1) {
122 DEBUG(DEBUG_WARNING, ("Failed to set non_blocking on fd - %s\n",
127 void set_close_on_exec(int fd)
131 v = fcntl(fd, F_GETFD, 0);
133 DEBUG(DEBUG_WARNING, ("Failed to get file descriptor flags - %s\n",
137 if (fcntl(fd, F_SETFD, v | FD_CLOEXEC) != 0) {
138 DEBUG(DEBUG_WARNING, ("Failed to set close_on_exec on fd - %s\n",
144 bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
146 sin->sin_family = AF_INET;
147 sin->sin_port = htons(port);
149 if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
150 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
157 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
159 saddr->ip6.sin6_family = AF_INET6;
160 saddr->ip6.sin6_port = htons(port);
161 saddr->ip6.sin6_flowinfo = 0;
162 saddr->ip6.sin6_scope_id = 0;
164 if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
165 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
169 if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
170 if (strchr(ifaces, ',')) {
171 DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
172 "is specified for multiple ifaces %s\n",
176 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
185 bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
190 ZERO_STRUCTP(saddr); /* valgrind :-) */
192 /* now is this a ipv4 or ipv6 address ?*/
193 p = index(addr, ':');
195 ret = parse_ipv4(addr, port, &saddr->ip);
197 ret = parse_ipv6(addr, ifaces, port, saddr);
206 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
209 char s[64]; /* Much longer than INET6_ADDRSTRLEN */
217 if (len >= sizeof(s)) {
218 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
222 strncpy(s, str, len+1);
226 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
230 *mask = strtoul(p+1, &endp, 10);
231 if (endp == NULL || *endp != 0) {
232 /* trailing garbage */
233 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
239 /* now is this a ipv4 or ipv6 address ?*/
240 ret = parse_ip(s, ifaces, 0, addr);
248 bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
251 char s[64]; /* Much longer than INET6_ADDRSTRLEN */
258 if (len >= sizeof(s)) {
259 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
263 strncpy(s, addr, len+1);
267 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
271 port = strtoul(p+1, &endp, 10);
272 if (endp == NULL || *endp != 0) {
273 /* trailing garbage */
274 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
279 /* now is this a ipv4 or ipv6 address ?*/
280 ret = parse_ip(s, NULL, port, saddr);
285 /* we don't lock future pages here; it would increase the chance that
286 * we'd fail to mmap later on. */
287 void lockdown_memory(bool valgrinding)
289 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
290 /* Extra stack, please! */
292 memset(dummy, 0, sizeof(dummy));
298 /* Ignore when running in local daemons mode */
303 /* Avoid compiler optimizing out dummy. */
304 mlock(dummy, sizeof(dummy));
305 if (mlockall(MCL_CURRENT) != 0) {
306 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
312 int mkdir_p(const char *dir, int mode)
318 if (strcmp(dir, "/") == 0) {
322 if (strcmp(dir, ".") == 0) {
326 /* Try to create directory */
327 ret = mkdir(dir, mode);
328 /* Succeed if that worked or if it already existed */
329 if (ret == 0 || errno == EEXIST) {
332 /* Fail on anything else except ENOENT */
333 if (errno != ENOENT) {
337 /* Create ancestors */
339 if (len >= PATH_MAX) {
340 errno = ENAMETOOLONG;
343 strncpy(t, dir, len+1);
345 ret = mkdir_p(dirname(t), mode);
350 /* Create directory */
351 ret = mkdir(dir, mode);
352 if ((ret == -1) && (errno == EEXIST)) {
359 void mkdir_p_or_die(const char *dir, int mode)
363 ret = mkdir_p(dir, mode);
366 ("ctdb exiting with error: "
367 "failed to create directory \"%s\" (%s)\n",
368 dir, strerror(errno)));
373 /* A read wrapper that will deal with EINTR. For now, copied from
374 * source3/lib/system.c
376 ssize_t sys_read(int fd, void *buf, size_t count)
381 ret = read(fd, buf, count);
382 #if defined(EWOULDBLOCK)
383 } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
385 } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
390 /* A write wrapper that will deal with EINTR. For now, copied from
391 * source3/lib/system.c
393 ssize_t sys_write(int fd, const void *buf, size_t count)
398 ret = write(fd, buf, count);
399 #if defined(EWOULDBLOCK)
400 } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
402 } while (ret == -1 && (errno == EINTR || errno == EAGAIN));