source: trunk/kernel/syscalls/sys_open.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_open.c - open a named file
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 <process.h>
28#include <spinlock.h>
29#include <cpu-trace.h>
30
31///////////////////////////////////
32int sys_open ( char     * pathname,
33               uint32_t   flags,
34               uint32_t   mode )
35{
36        CPU_HW_TRACE(sys_open);
37
38        error_t            err;
39        struct vfs_file_s  file;   
40        struct ku_obj      ku_path;
41        thread_t         * this     = current_thread;
42        process_t        * process  = current_process;
43        uint32_t           fd       = (uint32_t)-1;
44
45        cpu_trace_write(current_cpu, sys_open);
46
47        if( process_fd_aray_full( process ) )
48        {
49                this->info.errno = ENFILE;
50        CPU_HW_TRACE(sys_open);
51        return fd;
52        }
53   
54        if( VFS_IS( flags , VFS_O_DIRECTORY ) ) VFS_SET( flags , VFS_DIR );
55
56        KU_BUFF( ku_path , pathname );
57
58    // get the cwd lock
59        rwlock_rdlock( &process->cwd_lock );
60   
61        err = vfs_open( &process->vfs_cwd , &ku_path , flags , mode , &file );
62        if( err )
63        {
64                this->info.errno = (err < 0 ) ? -err : err;
65            rwlock_unlock( &process->cwd_lock );
66            CPU_HW_TRACE(sys_open);
67            return fd;
68        }
69       
70        err = process_fd_set( process , &file , &fd );
71        if( err )
72        {
73                vfs_close(&file, NULL);
74                this->info.errno = err;
75        }
76
77        rwlock_unlock( &process->cwd_lock );
78        CPU_HW_TRACE(sys_open);
79        return fd;
80}
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