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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* 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_getcwd.c
- *
- * Implementation of system call "getcwd", "chdir" and "fchdir".
- */
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_thread.h>
- #include <shim_handle.h>
- #include <shim_fs.h>
- #include <shim_utils.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <errno.h>
- int shim_do_getcwd (char * buf, size_t len)
- {
- int ret = 0;
- if (buf == NULL || len == 0) {
- ret = -EINVAL;
- goto out;
- }
- struct shim_thread * thread = get_cur_thread();
- assert(thread);
- struct shim_dentry * cwd = thread->cwd;
- int plen;
- const char * path = dentry_get_path(cwd, true, &plen);
- if (plen > len) {
- ret = -ENAMETOOLONG;
- goto out;
- } else
- ret = plen;
- memcpy(buf, path, plen + 1);
- out:
- return ret;
- }
- int shim_do_chdir (const char * filename)
- {
- struct shim_thread * thread = get_cur_thread();
- assert(thread);
- struct shim_dentry * dent = NULL;
- int ret;
- if ((ret = path_lookupat(NULL, filename, LOOKUP_OPEN, &dent, NULL)) < 0)
- return ret;
- if (!dent)
- return -ENOENT;
- if (!(dent->state & DENTRY_ISDIRECTORY)) {
- debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
- put_dentry(dent);
- return -ENOTDIR;
- }
- lock(thread->lock);
- put_dentry(thread->cwd);
- thread->cwd = dent;
- unlock(thread->lock);
- return 0;
- }
- int shim_do_fchdir (int fd)
- {
- struct shim_thread * thread = get_cur_thread();
- struct shim_handle * hdl = get_fd_handle(fd, NULL, thread->handle_map);
- if (!hdl)
- return -EBADF;
- struct shim_dentry * dent = hdl->dentry;
- if (!(dent->state & DENTRY_ISDIRECTORY)) {
- debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
- put_handle(hdl);
- return -ENOTDIR;
- }
- lock(thread->lock);
- get_dentry(dent);
- put_dentry(thread->cwd);
- thread->cwd = dent;
- unlock(thread->lock);
- put_handle(hdl);
- return 0;
- }
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