1 #include <ccan/tdb2/tdb2.h>
2 #include <ccan/tap/tap.h>
10 #include "external-agent.h"
13 #define alarm fast_alarm
15 /* Speed things up by doing things in milliseconds. */
16 static unsigned int fast_alarm(unsigned int milli_seconds)
20 it.it_interval.tv_sec = it.it_interval.tv_usec = 0;
21 it.it_value.tv_sec = milli_seconds / 1000;
22 it.it_value.tv_usec = milli_seconds * 1000;
23 setitimer(ITIMER_REAL, &it, NULL);
27 #define CatchSignal(sig, handler) signal((sig), (handler))
29 static void do_nothing(int signum)
33 /* This example code is taken from SAMBA, so try not to change it. */
34 static struct flock flock_struct;
36 /* Return a value which is none of v1, v2 or v3. */
37 static inline short int invalid_value(short int v1, short int v2, short int v3)
39 short int try = (v1+v2+v3)^((v1+v2+v3) << 16);
40 while (try == v1 || try == v2 || try == v3)
45 /* We invalidate in as many ways as we can, so the OS rejects it */
46 static void invalidate_flock_struct(int signum)
48 flock_struct.l_type = invalid_value(F_RDLCK, F_WRLCK, F_UNLCK);
49 flock_struct.l_whence = invalid_value(SEEK_SET, SEEK_CUR, SEEK_END);
50 flock_struct.l_start = -1;
51 /* A large negative. */
52 flock_struct.l_len = (((off_t)1 << (sizeof(off_t)*CHAR_BIT - 1)) + 1);
55 static int timeout_lock(int fd, int rw, off_t off, off_t len, bool waitflag,
58 int ret, saved_errno = errno;
59 unsigned int timeout = *(unsigned int *)_timeout;
61 flock_struct.l_type = rw;
62 flock_struct.l_whence = SEEK_SET;
63 flock_struct.l_start = off;
64 flock_struct.l_len = len;
66 CatchSignal(SIGALRM, invalidate_flock_struct);
71 ret = fcntl(fd, F_SETLKW, &flock_struct);
73 ret = fcntl(fd, F_SETLK, &flock_struct);
78 /* Not signalled? Something else went wrong. */
79 if (flock_struct.l_len == len) {
80 if (errno == EAGAIN || errno == EINTR)
95 static int tdb_chainlock_with_timeout_internal(struct tdb_context *tdb,
100 union tdb_attribute locking;
101 enum TDB_ERROR ecode;
104 locking.base.attr = TDB_ATTRIBUTE_FLOCK;
105 ecode = tdb_get_attribute(tdb, &locking);
106 if (ecode != TDB_SUCCESS)
109 /* Replace locking function with our own. */
110 locking.flock.data = &timeout;
111 locking.flock.lock = timeout_lock;
113 ecode = tdb_set_attribute(tdb, &locking);
114 if (ecode != TDB_SUCCESS)
117 if (rw_type == F_RDLCK)
118 ecode = tdb_chainlock_read(tdb, key);
120 ecode = tdb_chainlock(tdb, key);
123 tdb_unset_attribute(tdb, TDB_ATTRIBUTE_FLOCK);
128 int main(int argc, char *argv[])
131 struct tdb_context *tdb;
132 TDB_DATA key = tdb_mkdata("hello", 5);
133 int flags[] = { TDB_DEFAULT, TDB_NOMMAP,
134 TDB_CONVERT, TDB_NOMMAP|TDB_CONVERT,
135 TDB_VERSION1, TDB_NOMMAP|TDB_VERSION1,
136 TDB_CONVERT|TDB_VERSION1,
137 TDB_NOMMAP|TDB_CONVERT|TDB_VERSION1 };
140 plan_tests(sizeof(flags) / sizeof(flags[0]) * 15);
142 agent = prepare_external_agent();
144 for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) {
145 enum TDB_ERROR ecode;
146 tdb = tdb_open("run-locktimeout.tdb", flags[i],
147 O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr);
151 /* Simple cases: should succeed. */
152 ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20,
154 ok1(ecode == TDB_SUCCESS);
155 ok1(tap_log_messages == 0);
157 tdb_chainunlock_read(tdb, key);
158 ok1(tap_log_messages == 0);
160 ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20,
162 ok1(ecode == TDB_SUCCESS);
163 ok1(tap_log_messages == 0);
165 tdb_chainunlock(tdb, key);
166 ok1(tap_log_messages == 0);
168 /* OK, get agent to start transaction, then we should time out. */
169 ok1(external_agent_operation(agent, OPEN, "run-locktimeout.tdb")
171 ok1(external_agent_operation(agent, TRANSACTION_START, "")
173 ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20,
175 ok1(ecode == TDB_ERR_LOCK);
176 ok1(tap_log_messages == 0);
178 /* Even if we get a different signal, should be fine. */
179 CatchSignal(SIGUSR1, do_nothing);
180 external_agent_operation(agent, SEND_SIGNAL, "");
181 ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20,
183 ok1(ecode == TDB_ERR_LOCK);
184 ok1(tap_log_messages == 0);
186 ok1(external_agent_operation(agent, TRANSACTION_COMMIT, "")
188 ok1(external_agent_operation(agent, CLOSE, "")
192 free_external_agent(agent);
193 return exit_status();