58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
|
|
|
|
use super::SyscallReturn;
|
|
use crate::{
|
|
fs,
|
|
fs::{
|
|
file_table::FileDesc,
|
|
path::{AT_FDCWD, FsPath},
|
|
utils::{InodeType, mkmod},
|
|
},
|
|
prelude::*,
|
|
syscall::constants::MAX_FILENAME_LEN,
|
|
};
|
|
|
|
pub fn sys_symlinkat(
|
|
target_addr: Vaddr,
|
|
dirfd: FileDesc,
|
|
linkpath_addr: Vaddr,
|
|
ctx: &Context,
|
|
) -> Result<SyscallReturn> {
|
|
let user_space = ctx.user_space();
|
|
let target = user_space.read_cstring(target_addr, MAX_FILENAME_LEN)?;
|
|
let link_path_name = user_space.read_cstring(linkpath_addr, MAX_FILENAME_LEN)?;
|
|
debug!(
|
|
"target = {:?}, dirfd = {}, linkpath = {:?}",
|
|
target, dirfd, link_path_name
|
|
);
|
|
|
|
let target = target.to_string_lossy();
|
|
if target.is_empty() {
|
|
return_errno_with_message!(Errno::ENOENT, "the symlink path is empty");
|
|
}
|
|
|
|
let (dir_path, link_name) = {
|
|
let link_path_name = link_path_name.to_string_lossy();
|
|
let fs_path = FsPath::from_fd_and_path(dirfd, &link_path_name)?;
|
|
ctx.thread_local
|
|
.borrow_fs()
|
|
.resolver()
|
|
.read()
|
|
.lookup_unresolved_no_follow(&fs_path)?
|
|
.into_parent_and_filename()?
|
|
};
|
|
|
|
let new_path = dir_path.new_fs_child(&link_name, InodeType::SymLink, mkmod!(a+rwx))?;
|
|
new_path.inode().write_link(&target)?;
|
|
fs::notify::on_create(&dir_path, || link_name);
|
|
Ok(SyscallReturn::Return(0))
|
|
}
|
|
|
|
pub fn sys_symlink(
|
|
target_addr: Vaddr,
|
|
linkpath_addr: Vaddr,
|
|
ctx: &Context,
|
|
) -> Result<SyscallReturn> {
|
|
self::sys_symlinkat(target_addr, AT_FDCWD, linkpath_addr, ctx)
|
|
}
|