diff options
Diffstat (limited to 'lib/tdb2/test/run-locktimeout.c')
| -rw-r--r-- | lib/tdb2/test/run-locktimeout.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/lib/tdb2/test/run-locktimeout.c b/lib/tdb2/test/run-locktimeout.c new file mode 100644 index 00000000000..bb5b5db29b4 --- /dev/null +++ b/lib/tdb2/test/run-locktimeout.c @@ -0,0 +1,192 @@ +#include <ccan/tdb2/tdb.c> +#include <ccan/tdb2/open.c> +#include <ccan/tdb2/free.c> +#include <ccan/tdb2/lock.c> +#include <ccan/tdb2/io.c> +#include <ccan/tdb2/hash.c> +#include <ccan/tdb2/transaction.c> +#include <ccan/tdb2/check.c> +#include <ccan/tap/tap.h> +#include "logging.h" +#include "external-agent.h" + +#undef alarm +#define alarm fast_alarm + +/* Speed things up by doing things in milliseconds. */ +static unsigned int fast_alarm(unsigned int milli_seconds) +{ + struct itimerval it; + + it.it_interval.tv_sec = it.it_interval.tv_usec = 0; + it.it_value.tv_sec = milli_seconds / 1000; + it.it_value.tv_usec = milli_seconds * 1000; + setitimer(ITIMER_REAL, &it, NULL); + return 0; +} + +#define CatchSignal(sig, handler) signal((sig), (handler)) + +static void do_nothing(int signum) +{ +} + +/* This example code is taken from SAMBA, so try not to change it. */ +static struct flock flock_struct; + +/* Return a value which is none of v1, v2 or v3. */ +static inline short int invalid_value(short int v1, short int v2, short int v3) +{ + short int try = (v1+v2+v3)^((v1+v2+v3) << 16); + while (try == v1 || try == v2 || try == v3) + try++; + return try; +} + +/* We invalidate in as many ways as we can, so the OS rejects it */ +static void invalidate_flock_struct(int signum) +{ + flock_struct.l_type = invalid_value(F_RDLCK, F_WRLCK, F_UNLCK); + flock_struct.l_whence = invalid_value(SEEK_SET, SEEK_CUR, SEEK_END); + flock_struct.l_start = -1; + /* A large negative. */ + flock_struct.l_len = (((off_t)1 << (sizeof(off_t)*CHAR_BIT - 1)) + 1); +} + +static int timeout_lock(int fd, int rw, off_t off, off_t len, bool waitflag, + void *_timeout) +{ + int ret, saved_errno = errno; + unsigned int timeout = *(unsigned int *)_timeout; + + flock_struct.l_type = rw; + flock_struct.l_whence = SEEK_SET; + flock_struct.l_start = off; + flock_struct.l_len = len; + + CatchSignal(SIGALRM, invalidate_flock_struct); + alarm(timeout); + + for (;;) { + if (waitflag) + ret = fcntl(fd, F_SETLKW, &flock_struct); + else + ret = fcntl(fd, F_SETLK, &flock_struct); + + if (ret == 0) + break; + + /* Not signalled? Something else went wrong. */ + if (flock_struct.l_len == len) { + if (errno == EAGAIN || errno == EINTR) + continue; + saved_errno = errno; + break; + } else { + saved_errno = EINTR; + break; + } + } + + alarm(0); + errno = saved_errno; + return ret; +} + +static int tdb_chainlock_with_timeout_internal(struct tdb_context *tdb, + TDB_DATA key, + unsigned int timeout, + int rw_type) +{ + union tdb_attribute locking; + enum TDB_ERROR ecode; + + if (timeout) { + locking.base.attr = TDB_ATTRIBUTE_FLOCK; + ecode = tdb_get_attribute(tdb, &locking); + if (ecode != TDB_SUCCESS) + return ecode; + + /* Replace locking function with our own. */ + locking.flock.data = &timeout; + locking.flock.lock = timeout_lock; + + ecode = tdb_set_attribute(tdb, &locking); + if (ecode != TDB_SUCCESS) + return ecode; + } + if (rw_type == F_RDLCK) + ecode = tdb_chainlock_read(tdb, key); + else + ecode = tdb_chainlock(tdb, key); + + if (timeout) { + tdb_unset_attribute(tdb, TDB_ATTRIBUTE_FLOCK); + } + return ecode; +} + +int main(int argc, char *argv[]) +{ + unsigned int i; + struct tdb_context *tdb; + TDB_DATA key = tdb_mkdata("hello", 5); + int flags[] = { TDB_DEFAULT, TDB_NOMMAP, + TDB_CONVERT, TDB_NOMMAP|TDB_CONVERT }; + struct agent *agent; + + plan_tests(sizeof(flags) / sizeof(flags[0]) * 15); + + agent = prepare_external_agent(); + + for (i = 0; i < sizeof(flags) / sizeof(flags[0]); i++) { + enum TDB_ERROR ecode; + tdb = tdb_open("run-locktimeout.tdb", flags[i], + O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr); + if (!ok1(tdb)) + break; + + /* Simple cases: should succeed. */ + ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20, + F_RDLCK); + ok1(ecode == TDB_SUCCESS); + ok1(tap_log_messages == 0); + + tdb_chainunlock_read(tdb, key); + ok1(tap_log_messages == 0); + + ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20, + F_WRLCK); + ok1(ecode == TDB_SUCCESS); + ok1(tap_log_messages == 0); + + tdb_chainunlock(tdb, key); + ok1(tap_log_messages == 0); + + /* OK, get agent to start transaction, then we should time out. */ + ok1(external_agent_operation(agent, OPEN, "run-locktimeout.tdb") + == SUCCESS); + ok1(external_agent_operation(agent, TRANSACTION_START, "") + == SUCCESS); + ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20, + F_WRLCK); + ok1(ecode == TDB_ERR_LOCK); + ok1(tap_log_messages == 0); + + /* Even if we get a different signal, should be fine. */ + CatchSignal(SIGUSR1, do_nothing); + external_agent_operation(agent, SEND_SIGNAL, ""); + ecode = tdb_chainlock_with_timeout_internal(tdb, key, 20, + F_WRLCK); + ok1(ecode == TDB_ERR_LOCK); + ok1(tap_log_messages == 0); + + ok1(external_agent_operation(agent, TRANSACTION_COMMIT, "") + == SUCCESS); + ok1(external_agent_operation(agent, CLOSE, "") + == SUCCESS); + tdb_close(tdb); + } + free_external_agent(agent); + return exit_status(); +} |