static struct tdb_context *tdb;
+static enum TDB_ERROR clear_if_first(int fd, void *arg)
+{
+/* We hold a lock offset 63 always, so we can tell if anyone is holding it. */
+ struct flock fl;
+
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 63;
+ fl.l_len = 1;
+
+ if (fcntl(fd, F_SETLK, &fl) == 0) {
+ /* We must be first ones to open it! */
+ diag("agent truncating file!");
+ if (ftruncate(fd, 0) != 0) {
+ return TDB_ERR_IO;
+ }
+ }
+ fl.l_type = F_RDLCK;
+ if (fcntl(fd, F_SETLKW, &fl) != 0) {
+ return TDB_ERR_IO;
+ }
+ return TDB_SUCCESS;
+}
+
static enum agent_return do_operation(enum operation op, const char *name)
{
TDB_DATA k;
enum agent_return ret;
TDB_DATA data;
enum TDB_ERROR ecode;
+ union tdb_attribute cif;
- if (op != OPEN && !tdb) {
+ if (op != OPEN && op != OPEN_WITH_HOOK && !tdb) {
diag("external: No tdb open!");
return OTHER_FAILURE;
}
diag("external: %s", operation_name(op));
- k.dptr = (void *)name;
- k.dsize = strlen(name);
+ k = tdb_mkdata(name, strlen(name));
locking_would_block = 0;
switch (op) {
} else
ret = SUCCESS;
break;
+ case OPEN_WITH_HOOK:
+ if (tdb) {
+ diag("Already have tdb %s open", tdb->name);
+ return OTHER_FAILURE;
+ }
+ cif.openhook.base.attr = TDB_ATTRIBUTE_OPENHOOK;
+ cif.openhook.base.next = &tap_log_attr;
+ cif.openhook.fn = clear_if_first;
+ tdb = tdb_open(name, TDB_DEFAULT, O_RDWR, 0, &cif);
+ if (!tdb) {
+ if (!locking_would_block)
+ diag("Opening tdb gave %s", strerror(errno));
+ forget_locking();
+ ret = OTHER_FAILURE;
+ } else
+ ret = SUCCESS;
+ break;
case FETCH:
ecode = tdb_fetch(tdb, k, &data);
if (ecode == TDB_ERR_NOEXIST) {
ret = tdb_close(tdb) == 0 ? SUCCESS : OTHER_FAILURE;
tdb = NULL;
break;
+ case SEND_SIGNAL:
+ /* We do this async */
+ ret = SUCCESS;
+ break;
default:
ret = OTHER_FAILURE;
}
if (write(response[1], &result, sizeof(result))
!= sizeof(result))
err(1, "Writing response");
+ if (name[0] == SEND_SIGNAL) {
+ struct timeval ten_ms;
+ ten_ms.tv_sec = 0;
+ ten_ms.tv_usec = 10000;
+ select(0, NULL, NULL, NULL, &ten_ms);
+ kill(getppid(), SIGUSR1);
+ }
}
exit(0);
}
{
switch (op) {
case OPEN: return "OPEN";
+ case OPEN_WITH_HOOK: return "OPEN_WITH_HOOK";
case FETCH: return "FETCH";
case STORE: return "STORE";
case CHECK: return "CHECK";
case TRANSACTION_START: return "TRANSACTION_START";
case TRANSACTION_COMMIT: return "TRANSACTION_COMMIT";
case NEEDS_RECOVERY: return "NEEDS_RECOVERY";
+ case SEND_SIGNAL: return "SEND_SIGNAL";
case CLOSE: return "CLOSE";
}
return "**INVALID**";