diff options
| author | dzwdz | 2023-01-11 19:35:44 +0100 |
|---|---|---|
| committer | dzwdz | 2023-01-11 19:37:46 +0100 |
| commit | ec81fa16d837f430add92b4d2ee4bd3727ca6c6d (patch) | |
| tree | 43c91abe8d6a76fcec006fe67c1b585573d3662f /src/kernel/syscalls.c | |
| parent | c178ab5d5ca328d5b0072d54e3dc66d1b198df7b (diff) | |
kernel: return EPIPE when fs_waiting on a dead filesystem
Diffstat (limited to 'src/kernel/syscalls.c')
| -rw-r--r-- | src/kernel/syscalls.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c index 8bd7de3..3ebda61 100644 --- a/src/kernel/syscalls.c +++ b/src/kernel/syscalls.c @@ -62,8 +62,8 @@ long _syscall_fork(int flags, handle_t __user *fs_front) { h->backend = kzalloc(sizeof *h->backend); h->backend->is_user = true; - h->backend->potential_handlers = 1; - h->backend->refcount = 2; // child + handle + h->backend->provhcnt = 1; /* child */ + h->backend->usehcnt = 1; /* handle */ h->backend->user.handler = NULL; h->backend->queue = NULL; child->controlled = h->backend; @@ -149,7 +149,10 @@ long _syscall_mount(handle_t hid, const char __user *path, long len) { if (!handle || handle->type != HANDLE_FS_FRONT) goto fail; backend = handle->backend; - if (backend) backend->refcount++; + if (backend) { + assert(backend->usehcnt); + backend->usehcnt++; + } // append to mount list // TODO move to kernel/vfs/mount.c @@ -269,6 +272,10 @@ handle_t _syscall_fs_wait(char __user *buf, long max_len, struct ufs_request __u struct vfs_backend *backend = process_current->controlled; // TODO can be used to tell if you're init if (!backend) SYSCALL_RETURN(-1); + if (backend->usehcnt == 0) { + /* nothing on the other end. EPIPE seems fitting */ + SYSCALL_RETURN(-EPIPE); + } process_transition(process_current, PS_WAITS4REQUEST); if (backend->user.handler) |