2 * $Id: main.c,v 1.1.4.6 2003-12-12 19:27:57 didg Exp $
4 * Copyright (C) Joerg Lenneis 2003
5 * All Rights Reserved. See COPYRIGHT.
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;
203 LOG(log_error, logtype_cnid, "main: not enough arguments");
207 if (chdir(dir) < 0) {
208 LOG(log_error, logtype_cnid, "chdir to %s failed: %s", dir, strerror(errno));
211 if (stat(".", &st) < 0) {
212 LOG(log_error, logtype_cnid, "error in stat for %s: %s", dir, strerror(errno));
216 LOG(log_info, logtype_cnid, "Setting uid/gid to %i/%i", st.st_uid, st.st_gid);
217 if (setegid(st.st_gid) < 0 || seteuid(st.st_uid) < 0) {
218 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
222 /* Before we do anything else, check if there is an instance of cnid_dbd
223 running already and silently exit if yes. */
225 if ((lockfd = open(LOCKFILENAME, O_RDWR | O_CREAT, 0644)) < 0) {
226 LOG(log_error, logtype_cnid, "main: error opening lockfile: %s", strerror(errno));
231 lock.l_whence = SEEK_SET;
233 lock.l_type = F_WRLCK;
235 if (fcntl(lockfd, F_SETLK, &lock) < 0) {
236 if (errno == EACCES || errno == EAGAIN) {
239 LOG(log_error, logtype_cnid, "main: fcntl F_WRLCK lockfile: %s", strerror(errno));
244 LOG(log_info, logtype_cnid, "Startup, DB dir %s", dir);
245 sv.sa_handler = sig_exit;
247 sigemptyset(&sv.sa_mask);
248 sigaddset(&sv.sa_mask, SIGINT);
249 sigaddset(&sv.sa_mask, SIGTERM);
250 if (sigaction(SIGINT, &sv, NULL) < 0 || sigaction(SIGTERM, &sv, NULL) < 0) {
251 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
254 sv.sa_handler = SIG_IGN;
255 sigemptyset(&sv.sa_mask);
256 if (sigaction(SIGPIPE, &sv, NULL) < 0) {
257 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
260 /* SIGINT and SIGTERM are always off, unless we get a return code of 0 from
261 comm_rcv (no requests for one second, see above in loop()). That means we
262 only shut down after one second of inactivity. */
264 if ((dbp = db_param_read(dir)) == NULL)
267 if (dbif_env_init(dbp) < 0)
268 exit(2); /* FIXME: same exit code as failure for dbif_open() */
270 #ifdef CNID_BACKEND_DBD_TXN
271 if (dbif_txn_begin() < 0)
275 if (dbif_open(dbp) < 0) {
276 #ifdef CNID_BACKEND_DBD_TXN
282 if (dbd_stamp() < 0) {
283 #ifdef CNID_BACKEND_DBD_TXN
289 #ifdef CNID_BACKEND_DBD_TXN
290 if (dbif_txn_commit() < 0)
293 if (comm_init(dbp) < 0) {
300 #ifndef CNID_BACKEND_DBD_TXN
301 /* FIXME: Do we really need to sync before closing the DB? Just closing it
307 if (dbif_close() < 0)
310 lock.l_type = F_UNLCK;
311 fcntl(lockfd, F_SETLK, &lock);
318 LOG(log_info, logtype_cnid, "main: Exiting on signal %i", exit_sig);
320 LOG(log_info, logtype_cnid, "main: Idle timeout, exiting");