hello->attach_flags_send = _KDBUS_ATTACH_ANY;
hello->attach_flags_recv = _KDBUS_ATTACH_ANY;
- if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0)
+ if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) {
+ if (errno == ENOTTY) /* Major API change */
+ return -ESOCKTNOSUPPORT;
return -errno;
+ }
/* not interested in any output values */
cmd_free.offset = hello->offset;
/* The higher 32bit of the bus_flags fields are considered
* 'incompatible flags'. Refuse them all for now. */
if (hello->bus_flags > 0xFFFFFFFFULL)
- return -EOPNOTSUPP;
+ return -ESOCKTNOSUPPORT;
return fd;
}
}
r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
- if (r < 0)
+ if (r < 0) {
+ if (errno == ENOTTY)
+ /* If the ioctl is not supported we assume that the
+ * API version changed in a major incompatible way,
+ * let's indicate an API incompatibility in this
+ * case. */
+ return -ESOCKTNOSUPPORT;
+
return -errno;
+ }
if (!b->kdbus_buffer) {
b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
/* The higher 32bit of the bus_flags fields are considered
* 'incompatible flags'. Refuse them all for now. */
if (hello->bus_flags > 0xFFFFFFFFULL) {
- r = -EOPNOTSUPP;
+ r = -ESOCKTNOSUPPORT;
goto fail;
}
if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
safe_close(fd);
+
+ /* Major API change? then the ioctls got shuffled around. */
+ if (errno == ENOTTY)
+ return -ESOCKTNOSUPPORT;
+
return -errno;
}