diff options
Diffstat (limited to 'src/libsystemd/sd-bus/bus-kernel.c')
| -rw-r--r-- | src/libsystemd/sd-bus/bus-kernel.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c index 556b5eb704..8e3b64337c 100644 --- a/src/libsystemd/sd-bus/bus-kernel.c +++ b/src/libsystemd/sd-bus/bus-kernel.c @@ -962,8 +962,16 @@ int bus_kernel_take_fd(sd_bus *b) { } 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); @@ -977,7 +985,7 @@ int bus_kernel_take_fd(sd_bus *b) { /* 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; } @@ -1611,6 +1619,11 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) { 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; } |