2 * $Id: main.c,v 1.1.4.10.2.1 2004-12-11 12:38:20 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 */
191 /* ------------------------ */
192 static void switch_to_user(char *dir)
196 if (chdir(dir) < 0) {
197 LOG(log_error, logtype_cnid, "chdir to %s failed: %s", dir, strerror(errno));
201 if (stat(".", &st) < 0) {
202 LOG(log_error, logtype_cnid, "error in stat for %s: %s", dir, strerror(errno));
206 LOG(log_info, logtype_cnid, "Setting uid/gid to %i/%i", st.st_uid, st.st_gid);
207 if (setgid(st.st_gid) < 0 || setuid(st.st_uid) < 0) {
208 LOG(log_error, logtype_cnid, "uid/gid: %s", strerror(errno));
214 /* ------------------------ */
220 if ((lockfd = open(LOCKFILENAME, O_RDWR | O_CREAT, 0644)) < 0) {
221 LOG(log_error, logtype_cnid, "main: error opening lockfile: %s", strerror(errno));
226 lock.l_whence = SEEK_SET;
228 lock.l_type = F_WRLCK;
230 if (fcntl(lockfd, F_SETLK, &lock) < 0) {
231 if (errno == EACCES || errno == EAGAIN) {
234 LOG(log_error, logtype_cnid, "main: fcntl F_WRLCK lockfile: %s", strerror(errno));
242 /* ----------------------- */
243 void set_signal(void)
247 sv.sa_handler = sig_exit;
249 sigemptyset(&sv.sa_mask);
250 sigaddset(&sv.sa_mask, SIGINT);
251 sigaddset(&sv.sa_mask, SIGTERM);
252 if (sigaction(SIGINT, &sv, NULL) < 0 || sigaction(SIGTERM, &sv, NULL) < 0) {
253 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
256 sv.sa_handler = SIG_IGN;
257 sigemptyset(&sv.sa_mask);
258 if (sigaction(SIGPIPE, &sv, NULL) < 0) {
259 LOG(log_error, logtype_cnid, "main: sigaction: %s", strerror(errno));
264 /* ----------------------- */
265 void free_lock(int lockfd)
270 lock.l_whence = SEEK_SET;
272 lock.l_type = F_UNLCK;
273 fcntl(lockfd, F_SETLK, &lock);
277 /* ------------------------ */
278 int main(int argc, char *argv[])
280 struct db_param *dbp;
282 int lockfd, ctrlfd, clntfd;
285 set_processname("cnid_dbd");
286 syslog_setup(log_debug, logtype_default, logoption_ndelay | logoption_pid, logfacility_daemon);
289 LOG(log_error, logtype_cnid, "main: not enough arguments");
294 ctrlfd = atoi(argv[2]);
295 clntfd = atoi(argv[3]);
299 /* Before we do anything else, check if there is an instance of cnid_dbd
300 running already and silently exit if yes. */
303 LOG(log_info, logtype_cnid, "Startup, DB dir %s", dir);
307 /* SIGINT and SIGTERM are always off, unless we get a return code of 0 from
308 comm_rcv (no requests for one second, see above in loop()). That means we
309 only shut down after one second of inactivity. */
312 if ((dbp = db_param_read(dir)) == NULL)
315 if (dbif_env_init(dbp) < 0)
316 exit(2); /* FIXME: same exit code as failure for dbif_open() */
318 #ifdef CNID_BACKEND_DBD_TXN
319 if (dbif_txn_begin() < 0)
323 if (dbif_open(dbp) < 0) {
324 #ifdef CNID_BACKEND_DBD_TXN
330 if (dbd_stamp() < 0) {
331 #ifdef CNID_BACKEND_DBD_TXN
337 #ifdef CNID_BACKEND_DBD_TXN
338 if (dbif_txn_commit() < 0)
342 if (comm_init(dbp, ctrlfd, clntfd) < 0) {
350 #ifndef CNID_BACKEND_DBD_TXN
351 /* FIXME: Do we really need to sync before closing the DB? Just closing it
357 if (dbif_close() < 0)
365 LOG(log_info, logtype_cnid, "main: Exiting on signal %i", exit_sig);
367 LOG(log_info, logtype_cnid, "main: Idle timeout, exiting");