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"
24 #include "system/network.h"
28 #include "lib/util/debug.h"
30 #include "protocol/protocol.h"
32 #include "common/logging.h"
33 #include "common/system.h"
44 if possible, make this task real time
46 bool set_scheduler(void)
49 #if HAVE_THREAD_SETSCHED
50 struct thrdentry64 te;
54 if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
55 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
59 if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
60 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
68 #if HAVE_SCHED_SETSCHEDULER
70 int policy = SCHED_FIFO;
74 #ifdef SCHED_RESET_ON_FORK
75 policy |= SCHED_RESET_ON_FORK;
77 if (sched_setscheduler(0, policy, &p) == -1) {
78 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
86 DEBUG(DEBUG_CRIT,("No way to set real-time priority.\n"));
91 reset scheduler from real-time to normal scheduling
93 void reset_scheduler(void)
96 #if HAVE_THREAD_SETSCHED
97 struct thrdentry64 te;
101 if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
102 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
104 if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
105 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
109 #if HAVE_SCHED_SETSCHEDULER
110 #ifndef SCHED_RESET_ON_FORK
111 struct sched_param p;
113 p.sched_priority = 0;
114 if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
115 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
122 void set_nonblocking(int fd)
126 v = fcntl(fd, F_GETFL, 0);
128 DEBUG(DEBUG_WARNING, ("Failed to get file status flags - %s\n",
132 if (fcntl(fd, F_SETFL, v | O_NONBLOCK) == -1) {
133 DEBUG(DEBUG_WARNING, ("Failed to set non_blocking on fd - %s\n",
138 void set_close_on_exec(int fd)
142 v = fcntl(fd, F_GETFD, 0);
144 DEBUG(DEBUG_WARNING, ("Failed to get file descriptor flags - %s\n",
148 if (fcntl(fd, F_SETFD, v | FD_CLOEXEC) != 0) {
149 DEBUG(DEBUG_WARNING, ("Failed to set close_on_exec on fd - %s\n",
155 bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
157 sin->sin_family = AF_INET;
158 sin->sin_port = htons(port);
160 if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
161 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
165 #ifdef HAVE_SOCK_SIN_LEN
166 sin->sin_len = sizeof(*sin);
171 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
173 saddr->ip6.sin6_family = AF_INET6;
174 saddr->ip6.sin6_port = htons(port);
175 saddr->ip6.sin6_flowinfo = 0;
176 saddr->ip6.sin6_scope_id = 0;
178 if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
179 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
183 if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
184 if (strchr(ifaces, ',')) {
185 DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
186 "is specified for multiple ifaces %s\n",
190 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
193 #ifdef HAVE_SOCK_SIN_LEN
194 saddr->ip6.sin6_len = sizeof(*saddr);
202 bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
207 ZERO_STRUCTP(saddr); /* valgrind :-) */
209 /* now is this a ipv4 or ipv6 address ?*/
210 p = index(addr, ':');
212 ret = parse_ipv4(addr, port, &saddr->ip);
214 ret = parse_ipv6(addr, ifaces, port, saddr);
223 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
226 char s[64]; /* Much longer than INET6_ADDRSTRLEN */
234 if (len >= sizeof(s)) {
235 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
239 strncpy(s, str, len+1);
243 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
247 *mask = strtoul(p+1, &endp, 10);
248 if (endp == NULL || *endp != 0) {
249 /* trailing garbage */
250 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
256 /* now is this a ipv4 or ipv6 address ?*/
257 ret = parse_ip(s, ifaces, 0, addr);
265 bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
268 char s[64]; /* Much longer than INET6_ADDRSTRLEN */
275 if (len >= sizeof(s)) {
276 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
280 strncpy(s, addr, len+1);
284 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
288 port = strtoul(p+1, &endp, 10);
289 if (endp == NULL || *endp != 0) {
290 /* trailing garbage */
291 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
296 /* now is this a ipv4 or ipv6 address ?*/
297 ret = parse_ip(s, NULL, port, saddr);
302 /* we don't lock future pages here; it would increase the chance that
303 * we'd fail to mmap later on. */
304 void lockdown_memory(bool valgrinding)
306 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
307 /* Extra stack, please! */
309 memset(dummy, 0, sizeof(dummy));
315 /* Ignore when running in local daemons mode */
320 /* Avoid compiler optimizing out dummy. */
321 mlock(dummy, sizeof(dummy));
322 if (mlockall(MCL_CURRENT) != 0) {
323 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
329 int mkdir_p(const char *dir, int mode)
335 if (strcmp(dir, "/") == 0) {
339 if (strcmp(dir, ".") == 0) {
343 /* Try to create directory */
344 ret = mkdir(dir, mode);
345 /* Succeed if that worked or if it already existed */
346 if (ret == 0 || errno == EEXIST) {
349 /* Fail on anything else except ENOENT */
350 if (errno != ENOENT) {
354 /* Create ancestors */
356 if (len >= PATH_MAX) {
357 errno = ENAMETOOLONG;
360 strncpy(t, dir, len+1);
362 ret = mkdir_p(dirname(t), mode);
367 /* Create directory */
368 ret = mkdir(dir, mode);
369 if ((ret == -1) && (errno == EEXIST)) {
376 void mkdir_p_or_die(const char *dir, int mode)
380 ret = mkdir_p(dir, mode);
383 ("ctdb exiting with error: "
384 "failed to create directory \"%s\" (%s)\n",
385 dir, strerror(errno)));
390 /* A read wrapper that will deal with EINTR. For now, copied from
391 * source3/lib/system.c
393 ssize_t sys_read(int fd, void *buf, size_t count)
398 ret = read(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));
407 /* A write wrapper that will deal with EINTR. For now, copied from
408 * source3/lib/system.c
410 ssize_t sys_write(int fd, const void *buf, size_t count)
415 ret = write(fd, buf, count);
416 #if defined(EWOULDBLOCK)
417 } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
419 } while (ret == -1 && (errno == EINTR || errno == EAGAIN));