2 * $Id: main.c,v 1.1.4.9 2004-03-21 23:04:07 lenneis 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));
221 LOG(log_info, logtype_cnid, "Setting uid/gid to %i/%i", st.st_uid, st.st_gid);
222 if (setgid(st.st_gid) < 0 || setuid(st.st_uid) < 0) {
223 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
226 /* Before we do anything else, check if there is an instance of cnid_dbd
227 running already and silently exit if yes. */
229 if ((lockfd = open(LOCKFILENAME, O_RDWR | O_CREAT, 0644)) < 0) {
230 LOG(log_error, logtype_cnid, "main: error opening lockfile: %s", strerror(errno));
235 lock.l_whence = SEEK_SET;
237 lock.l_type = F_WRLCK;
239 if (fcntl(lockfd, F_SETLK, &lock) < 0) {
240 if (errno == EACCES || errno == EAGAIN) {
243 LOG(log_error, logtype_cnid, "main: fcntl F_WRLCK lockfile: %s", strerror(errno));
248 LOG(log_info, logtype_cnid, "Startup, DB dir %s", dir);
250 sv.sa_handler = sig_exit;
252 sigemptyset(&sv.sa_mask);
253 sigaddset(&sv.sa_mask, SIGINT);
254 sigaddset(&sv.sa_mask, SIGTERM);
255 if (sigaction(SIGINT, &sv, NULL) < 0 || sigaction(SIGTERM, &sv, NULL) < 0) {
256 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
259 sv.sa_handler = SIG_IGN;
260 sigemptyset(&sv.sa_mask);
261 if (sigaction(SIGPIPE, &sv, NULL) < 0) {
262 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
265 /* SIGINT and SIGTERM are always off, unless we get a return code of 0 from
266 comm_rcv (no requests for one second, see above in loop()). That means we
267 only shut down after one second of inactivity. */
269 if ((dbp = db_param_read(dir)) == NULL)
272 if (dbif_env_init(dbp) < 0)
273 exit(2); /* FIXME: same exit code as failure for dbif_open() */
275 #ifdef CNID_BACKEND_DBD_TXN
276 if (dbif_txn_begin() < 0)
280 if (dbif_open(dbp) < 0) {
281 #ifdef CNID_BACKEND_DBD_TXN
287 if (dbd_stamp() < 0) {
288 #ifdef CNID_BACKEND_DBD_TXN
294 #ifdef CNID_BACKEND_DBD_TXN
295 if (dbif_txn_commit() < 0)
298 if (comm_init(dbp, ctrlfd, clntfd) < 0) {
305 #ifndef CNID_BACKEND_DBD_TXN
306 /* FIXME: Do we really need to sync before closing the DB? Just closing it
312 if (dbif_close() < 0)
315 lock.l_type = F_UNLCK;
316 fcntl(lockfd, F_SETLK, &lock);
323 LOG(log_info, logtype_cnid, "main: Exiting on signal %i", exit_sig);
325 LOG(log_info, logtype_cnid, "main: Idle timeout, exiting");