source: trunk/kernel/syscalls/sys_stat.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2 * kern/sys_stat.c - stats a file or directory
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <errno.h>
24#include <thread.h>
25#include <vfs.h>
26#include <sys-vfs.h>
27#include <task.h>
28#include <spinlock.h>
29#include <cpu-trace.h>
30
31
32int sys_stat(char *pathname, struct vfs_stat_s *buff, int fd)
33{
34        CPU_HW_TRACE(sys_stat);
35        struct thread_s *this;
36        register error_t err = 0;
37        struct vfs_file_s *file;
38        struct ku_obj ku_path;
39        struct task_s *task;
40
41        file = NULL;
42        this = current_thread;
43        task = current_task;
44
45        if((buff == NULL) || ((pathname == NULL) && (fd == -1)))
46        {
47                this->info.errno = EINVAL;
48                CPU_HW_TRACE(sys_stat);
49                return -1;
50        }
51
52        if(NOT_IN_USPACE((uint_t)buff))
53        {
54                this->info.errno = EPERM;
55                CPU_HW_TRACE(sys_stat);
56                return -1;
57        }
58
59        if(pathname == NULL)
60        {
61                if((fd >= CONFIG_TASK_FILE_MAX_NR) || (task_fd_lookup(task, fd, &file)))
62                {
63                        CPU_HW_TRACE(sys_stat);
64                        return EBADFD;
65                }
66 
67                err = vfs_stat(&task->vfs_cwd, NULL, buff, file);
68        }
69        else
70        {
71                KU_BUFF(ku_path, pathname);
72                rwlock_rdlock(&task->cwd_lock);
73                err = vfs_stat(&task->vfs_cwd, &ku_path, buff, NULL);
74                rwlock_unlock(&task->cwd_lock);
75        }
76 
77        this->info.errno = err;
78        CPU_HW_TRACE(sys_stat);
79        return 0;
80}
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