diff options
Diffstat (limited to 'src/kernel/syscalls.c')
| -rw-r--r-- | src/kernel/syscalls.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c index 0b557fb..fcd3c1e 100644 --- a/src/kernel/syscalls.c +++ b/src/kernel/syscalls.c @@ -200,6 +200,27 @@ fail: return -1; } +int _syscall_fs_wait(handle_t back, user_ptr info) { + struct handle *back_handle; + + if (back < 0 || back >= HANDLE_MAX) return -1; + back_handle = &process_current->handles[back]; + if (back_handle->type != HANDLE_FS_BACK) + return -1; + + process_current->state = PS_WAITS4REQUEST; + back_handle->fs.backend->handler = process_current; + + if (back_handle->fs.backend->queue) { + // handle queued requests + struct process *queued = back_handle->fs.backend->queue; + back_handle->fs.backend->queue = NULL; // TODO get the next queued proc + vfs_request_pass2handler(queued->pending_req); + } else { + process_switch_any(); + } +} + int syscall_handler(int num, int a, int b, int c) { switch (num) { case _SYSCALL_EXIT: @@ -220,6 +241,8 @@ int syscall_handler(int num, int a, int b, int c) { return _syscall_close(a); case _SYSCALL_FS_CREATE: return _syscall_fs_create(a); + case _SYSCALL_FS_WAIT: + return _syscall_fs_wait(a, b); default: tty_const("unknown syscall "); panic(); |