| 1 | /*
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| 2 | * sys_chmod.c - Change file access rights.
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017)
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| 5 | *
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| 6 | * Copyright (c) 2015 UPMC Sorbonne Universites
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| 7 | *
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| 8 | * This file is part of ALMOS-MKH.
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| 9 | *
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 11 | * under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; version 2.0 of the License.
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| 13 | *
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 17 | * General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 22 | */
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| 23 |
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| 24 | #include <hal_types.h>
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| 25 | #include <hal_uspace.h>
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| 26 | #include <vfs.h>
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| 27 | #include <vmm.h>
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| 28 | #include <printk.h>
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| 29 | #include <thread.h>
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| 30 | #include <process.h>
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| 31 |
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| 32 | //////////////////////////////////
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| 33 | int sys_chmod( char * pathname,
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| 34 | uint32_t rights )
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| 35 | {
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| 36 | error_t error;
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| 37 | paddr_t paddr;
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| 38 | uint32_t length;
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| 39 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
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| 40 |
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| 41 | thread_t * this = CURRENT_THREAD;
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| 42 | process_t * process = this->process;
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| 43 |
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| 44 | // check pathname in user space
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| 45 | error = vmm_v2p_translate( false , pathname , &paddr );
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| 46 |
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| 47 | if( error )
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| 48 | {
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| 49 | printk("\n[ERROR] in %s : user pathname unmapped for thread %x in process %x\n",
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| 50 | __FUNCTION__ , this->trdid , process->pid );
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| 51 | this->errno = EINVAL;
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| 52 | return -1;
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| 53 | }
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| 54 |
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| 55 | // get pathname length
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| 56 | length = hal_strlen_from_uspace( pathname );
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| 57 |
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| 58 | if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
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| 59 | {
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| 60 | printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
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| 61 | this->errno = ENFILE;
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| 62 | return -1;
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| 63 | }
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| 64 |
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| 65 | // get pathname copy in kernel space
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| 66 | hal_copy_from_uspace( kbuf, pathname, length );
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| 67 |
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| 68 | // get cluster and local pointer on reference process
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| 69 | xptr_t ref_xp = process->ref_xp;
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| 70 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
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| 71 | cxy_t ref_cxy = GET_CXY( ref_xp );
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| 72 |
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| 73 | // get extended pointer on cwd inode
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| 74 | xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
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| 75 |
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| 76 | // get the cwd lock in read mode from reference process
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| 77 | remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 78 |
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| 79 | // call the relevant VFS function
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| 80 | error = vfs_chmod( cwd_xp,
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| 81 | kbuf,
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| 82 | rights );
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| 83 |
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| 84 | // release the cwd lock
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| 85 | remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 86 |
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| 87 | if( error )
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| 88 | {
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| 89 | printk("\n[ERROR] in %s : cannot remove directory %s\n",
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| 90 | __FUNCTION__ , kbuf );
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| 91 | this->errno = error;
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| 92 | return -1;
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| 93 | }
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| 94 |
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| 95 | return 0;
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| 96 |
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| 97 | } // end sys_chmod()
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