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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 OSCAR lab, 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 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 General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_stat.c
- *
- * Implementation of system call "stat", "lstat", "fstat" and "readlink".
- */
- #include <shim_internal.h>
- #include <shim_table.h>
- #include <shim_handle.h>
- #include <shim_fs.h>
- #include <shim_profile.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <errno.h>
- int shim_do_stat (const char * file, struct stat * stat)
- {
- if (!file)
- return -EFAULT;
- int ret;
- struct shim_dentry * dent = NULL;
- if ((ret = path_lookupat(NULL, file, LOOKUP_ACCESS, &dent)) < 0)
- goto out;
- struct shim_mount * fs = dent->fs;
- if (!fs->d_ops || !fs->d_ops->stat) {
- ret = -EACCES;
- goto out_dentry;
- }
- ret = fs->d_ops->stat(dent, stat);
- out_dentry:
- put_dentry(dent);
- out:
- return ret;
- }
- int shim_do_lstat (const char * file, struct stat * stat)
- {
- if (!file)
- return -EFAULT;
- int ret;
- struct shim_dentry * dent = NULL;
- if ((ret = path_lookupat(NULL, file, LOOKUP_ACCESS, &dent)) < 0)
- goto out;
- struct shim_mount * fs = dent->fs;
- if (!fs->d_ops || !fs->d_ops->stat) {
- ret = -EACCES;
- goto out_dentry;
- }
- ret = fs->d_ops->stat(dent, stat);
- out_dentry:
- put_dentry(dent);
- out:
- return ret;
- }
- int shim_do_fstat (int fd, struct stat * stat)
- {
- struct shim_handle * hdl = get_fd_handle(fd, NULL, NULL);
- if (!hdl)
- return -EBADF;
- int ret = -EACCES;
- struct shim_mount * fs = hdl->fs;
- if (!fs || !fs->fs_ops)
- goto out;
- if (!fs->fs_ops->hstat)
- goto out;
- ret = fs->fs_ops->hstat(hdl, stat);
- out:
- put_handle(hdl);
- return ret;
- }
- int shim_do_readlink (const char * file, char * buf, int bufsize)
- {
- if (!file)
- return -EFAULT;
- if (bufsize <= 0)
- return -EINVAL;
- /* The correct behavior is to return -EINVAL if file is not a
- symbolic link */
- return -EINVAL;
- #if 0
- int ret;
- struct shim_dentry * dent = NULL;
- if ((ret = path_lookupat(NULL, file, LOOKUP_ACCESS, &dent)) < 0)
- return ret;
- char * relpath;
- int len;
- relpath = dentry_get_path(dent, true, &len);
- if (len > bufsize)
- len = bufsize;
- memcpy(buf, relpath, len);
- put_dentry(dent);
- return len;
- #endif
- }
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