/* Copyright (C) 2014 Stony Brook University
This file is part of Graphene Library OS.
Graphene Library OS is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Graphene Library OS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see . */
/*
* shim_clone.c
*
* Implementation of system call "dup", "dup2" and "dup3".
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
int shim_do_dup(int fd) {
struct shim_handle_map* handle_map = get_cur_handle_map(NULL);
int flags = 0;
struct shim_handle* hdl = get_fd_handle(fd, &flags, handle_map);
if (!hdl)
return -EBADF;
int vfd = set_new_fd_handle(hdl, flags, handle_map);
put_handle(hdl);
return vfd < 0 ? -EMFILE : vfd;
}
int shim_do_dup2(int oldfd, int newfd) {
struct shim_handle_map* handle_map = get_cur_handle_map(NULL);
struct shim_handle* hdl = get_fd_handle(oldfd, NULL, handle_map);
if (!hdl)
return -EBADF;
struct shim_handle* new_hdl = detach_fd_handle(newfd, NULL, handle_map);
if (new_hdl)
put_handle(new_hdl);
int vfd = set_new_fd_handle_by_fd(newfd, hdl, 0, handle_map);
put_handle(hdl);
return vfd < 0 ? -EMFILE : vfd;
}
int shim_do_dup3(int oldfd, int newfd, int flags) {
struct shim_handle_map* handle_map = get_cur_handle_map(NULL);
struct shim_handle* hdl = get_fd_handle(oldfd, NULL, handle_map);
if (!hdl)
return -EBADF;
struct shim_handle* new_hdl = detach_fd_handle(newfd, NULL, handle_map);
if (new_hdl)
put_handle(new_hdl);
int vfd = set_new_fd_handle_by_fd(newfd, hdl, flags, handle_map);
put_handle(hdl);
return vfd < 0 ? -EMFILE : vfd;
}