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- /* 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 <http://www.gnu.org/licenses/>. */
- /*
- * shim_clone.c
- *
- * Implementation of system call "dup", "dup2" and "dup3".
- */
- #include <errno.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <shim_fs.h>
- #include <shim_handle.h>
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_thread.h>
- #include <shim_utils.h>
- 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;
- }
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