blob: 9ccce9ef5489d7af9d0097d6880df95b3782a48b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/InodeWatcher.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<int> Process::sys$watch_file(Userspace<const char*> user_path, size_t path_length)
{
REQUIRE_PROMISE(rpath);
auto path = get_syscall_path_argument(user_path, path_length);
if (path.is_error())
return path.error();
auto custody_or_error = VFS::the().resolve_path(path.value(), current_directory());
if (custody_or_error.is_error())
return custody_or_error.error();
auto& custody = custody_or_error.value();
auto& inode = custody->inode();
if (!inode.fs().supports_watchers())
return ENOTSUP;
int fd = alloc_fd();
if (fd < 0)
return fd;
auto description = FileDescription::create(*InodeWatcher::create(inode));
if (description.is_error())
return description.error();
m_fds[fd].set(description.release_value());
m_fds[fd].description()->set_readable(true);
return fd;
}
}
|
