diff options
| -rw-r--r-- | storeio/io.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/storeio/io.c b/storeio/io.c index 3c4cb9ff..f01e1918 100644 --- a/storeio/io.c +++ b/storeio/io.c @@ -86,13 +86,20 @@ trivfs_S_io_read (struct trivfs_protid *cred, data_t *data, mach_msg_type_name_t *data_len, off_t offs, vm_size_t amount) { + error_t err; + size_t data_size = *data_len; + if (! cred) return EOPNOTSUPP; else if (! (cred->po->openmodes & O_READ)) return EBADF; - else - return open_read ((struct open *)cred->po->hook, - offs, amount, (void **)data, data_len); + + err = open_read ((struct open *)cred->po->hook, + offs, amount, (void **)data, &data_size); + if (err) + return err; + *data_len = data_size; + return 0; } /* Tell how much data can be read from the object without blocking for |