2 * $Id: main.c,v 1.1.4.10 2004-03-22 05:31:39 didg Exp $
4 * Copyright (C) Joerg Lenneis 2003
5 * All Rights Reserved. See COPYING.
10 #endif /* HAVE_CONFIG_H */
14 #endif /* HAVE_UNISTD_H */
17 #endif /* HAVE_FCNTL_H */
23 #ifdef HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif /* HAVE_SYS_TYPES_H */
26 #include <sys/param.h>
27 #ifdef HAVE_SYS_STAT_H
29 #endif /* HAVE_SYS_STAT_H */
33 #include <netatalk/endian.h>
34 #include <atalk/cnid_dbd_private.h>
35 #include <atalk/logger.h>
43 #define LOCKFILENAME "lock"
45 static int exit_sig = 0;
48 static void sig_exit(int signo)
54 static void block_sigs_onoff(int block)
59 sigaddset(&set, SIGINT);
60 sigaddset(&set, SIGTERM);
62 sigprocmask(SIG_BLOCK, &set, NULL);
64 sigprocmask(SIG_UNBLOCK, &set, NULL);
69 The dbd_XXX and comm_XXX functions all obey the same protocol for return values:
71 1: Success, if transactions are used commit.
72 0: Failure, but we continue to serve requests. If transactions are used abort/rollback.
73 -1: Fatal error, either from the database or from the socket. Abort the transaction if applicable
74 (which might fail as well) and then exit.
76 We always try to notify the client process about the outcome, the result field
77 of the cnid_dbd_rply structure contains further details.
81 static int loop(struct db_param *dbp)
83 struct cnid_dbd_rqst rqst;
84 struct cnid_dbd_rply rply;
86 time_t now, time_next_flush, time_last_rqst;
88 static char namebuf[MAXPATHLEN + 1];
89 u_int32_t checkp_flags;
93 time_next_flush = now + dbp->flush_interval;
96 checkp_flags = DB_FORCE;
103 if ((cret = comm_rcv(&rqst)) < 0)
108 if (count > dbp->flush_frequency || now > time_next_flush) {
109 #ifdef CNID_BACKEND_DBD_TXN
110 if (dbif_txn_checkpoint(0, 0, checkp_flags) < 0)
117 time_next_flush = now + dbp->flush_interval;
125 if (dbp->idle_timeout && comm_nbe() <= 0 && (now - time_last_rqst) > dbp->idle_timeout)
129 /* We got a request */
130 time_last_rqst = now;
133 #ifdef CNID_BACKEND_DBD_TXN
134 if (dbif_txn_begin() < 0)
136 #endif /* CNID_BACKEND_DBD_TXN */
138 memset(&rply, 0, sizeof(rply));
140 /* ret gets set here */
141 case CNID_DBD_OP_OPEN:
142 case CNID_DBD_OP_CLOSE:
143 /* open/close are noops for now. */
147 case CNID_DBD_OP_ADD:
148 ret = dbd_add(&rqst, &rply);
150 case CNID_DBD_OP_GET:
151 ret = dbd_get(&rqst, &rply);
153 case CNID_DBD_OP_RESOLVE:
154 ret = dbd_resolve(&rqst, &rply);
156 case CNID_DBD_OP_LOOKUP:
157 ret = dbd_lookup(&rqst, &rply);
159 case CNID_DBD_OP_UPDATE:
160 ret = dbd_update(&rqst, &rply);
162 case CNID_DBD_OP_DELETE:
163 ret = dbd_delete(&rqst, &rply);
165 case CNID_DBD_OP_GETSTAMP:
166 ret = dbd_getstamp(&rqst, &rply);
169 LOG(log_error, logtype_cnid, "loop: unknow op %d", rqst.op);
173 if ((cret = comm_snd(&rply)) < 0 || ret < 0) {
174 #ifdef CNID_BACKEND_DBD_TXN
176 #endif /* CNID_BACKEND_DBD_TXN */
179 #ifdef CNID_BACKEND_DBD_TXN
180 if (ret == 0 || cret == 0) {
181 if (dbif_txn_abort() < 0)
184 if (dbif_txn_commit() < 0)
187 #endif /* CNID_BACKEND_DBD_TXN */
192 int main(int argc, char *argv[])
195 struct db_param *dbp;
198 int lockfd, ctrlfd, clntfd;
202 set_processname("cnid_dbd");
205 LOG(log_error, logtype_cnid, "main: not enough arguments");
210 ctrlfd = atoi(argv[2]);
211 clntfd = atoi(argv[3]);
213 if (chdir(dir) < 0) {
214 LOG(log_error, logtype_cnid, "chdir to %s failed: %s", dir, strerror(errno));
217 if (stat(".", &st) < 0) {
218 LOG(log_error, logtype_cnid, "error in stat for %s: %s", dir, strerror(errno));
222 LOG(log_info, logtype_cnid, "Setting uid/gid to %i/%i", st.st_uid, st.st_gid);
223 if (setgid(st.st_gid) < 0 || setuid(st.st_uid) < 0) {
224 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
228 /* Before we do anything else, check if there is an instance of cnid_dbd
229 running already and silently exit if yes. */
231 if ((lockfd = open(LOCKFILENAME, O_RDWR | O_CREAT, 0644)) < 0) {
232 LOG(log_error, logtype_cnid, "main: error opening lockfile: %s", strerror(errno));
237 lock.l_whence = SEEK_SET;
239 lock.l_type = F_WRLCK;
241 if (fcntl(lockfd, F_SETLK, &lock) < 0) {
242 if (errno == EACCES || errno == EAGAIN) {
245 LOG(log_error, logtype_cnid, "main: fcntl F_WRLCK lockfile: %s", strerror(errno));
250 LOG(log_info, logtype_cnid, "Startup, DB dir %s", dir);
252 sv.sa_handler = sig_exit;
254 sigemptyset(&sv.sa_mask);
255 sigaddset(&sv.sa_mask, SIGINT);
256 sigaddset(&sv.sa_mask, SIGTERM);
257 if (sigaction(SIGINT, &sv, NULL) < 0 || sigaction(SIGTERM, &sv, NULL) < 0) {
258 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
261 sv.sa_handler = SIG_IGN;
262 sigemptyset(&sv.sa_mask);
263 if (sigaction(SIGPIPE, &sv, NULL) < 0) {
264 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
267 /* SIGINT and SIGTERM are always off, unless we get a return code of 0 from
268 comm_rcv (no requests for one second, see above in loop()). That means we
269 only shut down after one second of inactivity. */
271 if ((dbp = db_param_read(dir)) == NULL)
274 if (dbif_env_init(dbp) < 0)
275 exit(2); /* FIXME: same exit code as failure for dbif_open() */
277 #ifdef CNID_BACKEND_DBD_TXN
278 if (dbif_txn_begin() < 0)
282 if (dbif_open(dbp) < 0) {
283 #ifdef CNID_BACKEND_DBD_TXN
289 if (dbd_stamp() < 0) {
290 #ifdef CNID_BACKEND_DBD_TXN
296 #ifdef CNID_BACKEND_DBD_TXN
297 if (dbif_txn_commit() < 0)
300 if (comm_init(dbp, ctrlfd, clntfd) < 0) {
307 #ifndef CNID_BACKEND_DBD_TXN
308 /* FIXME: Do we really need to sync before closing the DB? Just closing it
314 if (dbif_close() < 0)
317 lock.l_type = F_UNLCK;
318 fcntl(lockfd, F_SETLK, &lock);
325 LOG(log_info, logtype_cnid, "main: Exiting on signal %i", exit_sig);
327 LOG(log_info, logtype_cnid, "main: Idle timeout, exiting");