diff options
| -rw-r--r-- | libstore/file.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/libstore/file.c b/libstore/file.c index fff7bff9..ae09f958 100644 --- a/libstore/file.c +++ b/libstore/file.c @@ -147,12 +147,51 @@ file_clear_flags (struct store *store, int flags) return err; } +static error_t +file_map (const struct store *store, vm_prot_t prot, mach_port_t *memobj) +{ + error_t err; + mach_port_t rd_memobj, wr_memobj; + int ro = (store->flags & STORE_HARD_READONLY); + + if (store->num_runs != 1 || store->runs[0].start != 0) + return EOPNOTSUPP; + + if ((prot & VM_PROT_WRITE) && ro) + return EACCES; + + err = io_map (store->port, &rd_memobj, &wr_memobj); + if (err) + return err; + + *memobj = rd_memobj; + + if (ro && wr_memobj == MACH_PORT_NULL) + return 0; + else if (rd_memobj == wr_memobj) + { + if (rd_memobj != MACH_PORT_NULL) + mach_port_mod_refs (mach_task_self (), rd_memobj, + MACH_PORT_RIGHT_SEND, -1); + } + else + { + if (rd_memobj != MACH_PORT_NULL) + mach_port_deallocate (mach_task_self (), rd_memobj); + if (wr_memobj != MACH_PORT_NULL) + mach_port_deallocate (mach_task_self (), wr_memobj); + err = EOPNOTSUPP; + } + + return err; +} + struct store_class store_file_class = { STORAGE_HURD_FILE, "file", file_read, file_write, store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, - file_set_flags, file_clear_flags, 0, 0, 0, file_open + file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map }; static error_t @@ -176,7 +215,7 @@ store_file_byte_class = { STORAGE_HURD_FILE, "file", file_byte_read, file_byte_write, store_std_leaf_allocate_encoding, store_std_leaf_encode, file_decode, - file_set_flags, file_clear_flags, 0, 0, 0, file_open + file_set_flags, file_clear_flags, 0, 0, 0, file_open, 0, file_map }; /* Return a new store in STORE referring to the mach file FILE. Consumes |