source: trunk/kernel/syscalls/sys_creat.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_creat.c - create a 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 <config.h>
24#include <vfs.h>
25#include <sys-vfs.h>
26#include <spinlock.h>
27#include <process.h>
28#include <thread.h>
29
30////////////////////////////////////
31int sys_creat ( char     * pathname,
32                uint32_t   mode )
33{ 
34        CPU_HW_TRACE(sys_creat);
35
36        register error_t     err;
37        register uint32_t    flags;
38        register thread_t  * this    = durrent_thread;
39        register process_t * process = current_process;
40        struct vfs_file_s    file;
41        struct ku_obj        ku_path;
42        uint32_t             fd      = (uint32_t)-1;
43   
44        if( process_fd_array_full( process ) )
45        {
46                this->info.errno = ENFILE;
47            CPU_HW_TRACE(sys_creat);
48        return fd;
49        }
50
51        flags = 0;
52        KU_BUFF( ku_path , pathname );
53
54    // get the cwd lock
55        rwlock_rdlock( &process->cwd_lock );
56
57        err = vfs_create( &process->vfs_cwd , &ku_path , flags , mode , &file );
58        if( err )
59        {
60                this->info.errno = (err < 0 ) ? -err : err;
61            rwlock_unlock( &process->cwd_lock );
62            CPU_HW_TRACE(sys_creat);
63            return fd;
64        }
65
66        err = process_fd_set( process , &file , &fd );
67        if( err )
68        {
69                vfs_close( &file , NULL );
70                this->info.errno = err;
71        }
72
73        rwlock_unlock( &process->cwd_lock );
74        CPU_HW_TRACE(sys_creat);
75        return fd;
76}
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