Luna/kernel/src/sys/socket.cpp

#include "net/Socket.h"
#include "memory/MemoryManager.h"
#include "net/UnixSocket.h"
#include "sys/Syscall.h"
#include "thread/Scheduler.h"
#include <bits/open-flags.h>

Result<u64> sys_socket(Registers*, SyscallArgs args)
{
    int domain = (int)args[0];
    int type = (int)args[1];
    // protocol is not used for now.

    if (type != SOCK_STREAM) return err(EPROTOTYPE);
    if (domain != AF_UNIX) return err(EAFNOSUPPORT);

    auto socket = TRY(make_shared<UnixSocket>());

    auto* current = Scheduler::current();

    int fd = TRY(current->allocate_fd(0));

    current->fd_table[fd] = FileDescriptor { TRY(make_shared<OpenFileDescription>(socket, O_RDWR)), 0 };

    return fd;
}

Result<u64> sys_bind(Registers*, SyscallArgs args)
{
    int sockfd = (int)args[0];
    struct sockaddr* addr = (struct sockaddr*)args[1];
    socklen_t addrlen = (socklen_t)args[2];

    struct sockaddr_storage storage;
    if ((usize)addrlen > sizeof(storage)) return err(EINVAL);
    if (!MemoryManager::copy_from_user(addr, &storage, addrlen)) return err(EFAULT);

    auto* current = Scheduler::current();

    auto inode = TRY(current->resolve_fd(sockfd))->inode();

    if (inode->type() != VFS::InodeType::Socket) return err(ENOTSOCK);

    auto socket = (SharedPtr<Socket>)inode;

    TRY(socket->bind(socket, (struct sockaddr*)&storage, addrlen));

    return 0;
}