| 40,7 → 40,6 |
|---|
| #include <async.h> |
| #include <errno.h> |
| #include <rwlock.h> |
| #include <unistd.h> |
| |
| static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
| { |
| 156,60 → 155,6 |
|---|
| vfs_rdwr(rid, request, false); |
| } |
| |
| void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
| { |
| int fd = (int) IPC_GET_ARG1(*request); |
| off_t off = (off_t) IPC_GET_ARG2(*request); |
| int whence = (int) IPC_GET_ARG3(*request); |
| |
| |
| /* |
| * Lookup the file structure corresponding to the file descriptor. |
| */ |
| vfs_file_t *file = vfs_file_get(fd); |
| if (!file) { |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| off_t newpos; |
| futex_down(&file->lock); |
| if (whence == SEEK_SET) { |
| file->pos = off; |
| futex_up(&file->lock); |
| ipc_answer_1(rid, EOK, off); |
| return; |
| } |
| if (whence == SEEK_CUR) { |
| if (file->pos + off < file->pos) { |
| futex_up(&file->lock); |
| ipc_answer_0(rid, EOVERFLOW); |
| return; |
| } |
| file->pos += off; |
| newpos = file->pos; |
| futex_up(&file->lock); |
| ipc_answer_1(rid, EOK, newpos); |
| return; |
| } |
| if (whence == SEEK_END) { |
| rwlock_reader_lock(&file->node->contents_rwlock); |
| size_t size = file->node->size; |
| rwlock_reader_unlock(&file->node->contents_rwlock); |
| if (size + off < size) { |
| futex_up(&file->lock); |
| ipc_answer_0(rid, EOVERFLOW); |
| return; |
| } |
| newpos = size + off; |
| futex_up(&file->lock); |
| ipc_answer_1(rid, EOK, newpos); |
| return; |
| } |
| futex_up(&file->lock); |
| ipc_answer_0(rid, EINVAL); |
| } |
| |
| /** |
| * @} |
| */ |