Luna/kernel/src/sys/link.cpp

#include "memory/MemoryManager.h"
#include "sys/Syscall.h"
#include "thread/Scheduler.h"
#include <luna/PathParser.h>

Result<u64> sys_unlinkat(Registers*, SyscallArgs args)
{
    int dirfd = (int)args[0];
    auto path = TRY(MemoryManager::strdup_from_user(args[1]));
    int flags = (int)args[2];

    Thread* current = Scheduler::current();

    PathParser parser = TRY(PathParser::create(path.chars()));

    auto dirname = TRY(parser.dirname());
    auto basename = TRY(parser.basename());

    if (basename.view() == ".") return err(EINVAL);

    auto inode = TRY(current->resolve_atfile(dirfd, dirname, false));
    if (!VFS::can_write(inode, current->auth)) return err(EACCES);

    if (flags > 0)
    {
        auto child = TRY(inode->find(basename.chars()));
        if (child->type() != VFS::InodeType::Directory) return err(ENOTDIR);
    }

    TRY(inode->remove_entry(basename.chars()));

    return 0;
}