| 1 | /*
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| 2 | * sys_stat.c - Return statistics on a file or directory.
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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) 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 <hal_special.h>
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| 27 | #include <errno.h>
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| 28 | #include <thread.h>
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| 29 | #include <printk.h>
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| 30 | #include <vfs.h>
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| 31 | #include <vmm.h>
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| 32 | #include <process.h>
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| 33 |
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| 34 | //////////////////////////////////////////
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| 35 | int sys_stat( uint32_t file_id,
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| 36 | struct vfs_stat_s * stat )
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| 37 | {
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| 38 | error_t error;
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| 39 | paddr_t paddr;
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| 40 | struct vfs_stat_s k_stat;
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| 41 | xptr_t file_xp;
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| 42 |
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| 43 | thread_t * this = CURRENT_THREAD;
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| 44 | process_t * process = this->process;
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| 45 |
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| 46 | // check stat structure in user space
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| 47 | error = vmm_v2p_translate( false , stat , &paddr );
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| 48 |
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| 49 | if( error )
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| 50 | {
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| 51 | printk("\n[ERROR] in %s : stat structure unmapped for thread %x in process %x\n",
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| 52 | __FUNCTION__ , this->trdid , process->pid );
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| 53 | this->errno = EINVAL;
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| 54 | return -1;
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| 55 | }
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| 56 |
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| 57 | // get extended pointer on remote file descriptor
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| 58 | file_xp = process_fd_get_xptr( process , file_id );
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| 59 |
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| 60 | if( file_xp == XPTR_NULL )
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| 61 | {
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| 62 | printk("\n[ERROR] in %s : undefined file descriptor for thread %x in process %x\n",
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| 63 | __FUNCTION__ , this->trdid , process->pid );
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| 64 | this->errno = EBADFD;
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| 65 | return -1;
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| 66 | }
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| 67 |
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| 68 | // call the relevant VFS function
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| 69 | error = vfs_stat( file_xp,
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| 70 | &k_stat );
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| 71 | if( error )
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| 72 | {
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| 73 | printk("\n[ERROR] in %s : cannot access file %d for thread %x in process %x\n",
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| 74 | __FUNCTION__ , file_id , this->trdid , process->pid );
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| 75 | this->errno = error;
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| 76 | return -1;
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| 77 | }
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| 78 |
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| 79 | // copy stat to user space
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| 80 | hal_copy_to_uspace( stat , &k_stat , sizeof(struct vfs_stat_s) );
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| 81 |
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| 82 | hal_fence();
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| 83 |
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| 84 | return 0;
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| 85 |
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| 86 | } // end sys_stat()
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| 87 |
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