| 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 (2016,2017,2018)
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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_kernel_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 | #include <syscalls.h>
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| 35 |
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| 36 | /////////////////////////////////////
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| 37 | int sys_stat( const char * pathname,
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| 38 | struct stat * u_stat )
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| 39 | {
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| 40 | error_t error;
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| 41 | vseg_t * vseg; // for user space checking
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| 42 | struct stat k_stat; // kernel space
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| 43 | xptr_t file_xp;
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| 44 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
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| 45 |
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| 46 | thread_t * this = CURRENT_THREAD;
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| 47 | process_t * process = this->process;
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| 48 |
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| 49 | // check stat structure in user space
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| 50 | error = vmm_get_vseg( process , (intptr_t)u_stat , &vseg );
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| 51 |
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| 52 | if( error )
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| 53 | {
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| 54 |
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| 55 | #if DEBUG_SYSCALLS_ERROR
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| 56 | printk("\n[ERROR] in %s : stat structure unmapped %x / thread %x / process %x\n",
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| 57 | __FUNCTION__ , (intptr_t)u_stat , this->trdid , process->pid );
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| 58 | vmm_display( process , false );
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| 59 | #endif
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| 60 | this->errno = EINVAL;
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| 61 | return -1;
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| 62 | }
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| 63 |
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| 64 | // check pathname length
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| 65 | if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
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| 66 | {
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| 67 | printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
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| 68 | this->errno = ENFILE;
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| 69 | return -1;
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| 70 | }
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| 71 |
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| 72 | // copy pathname in kernel space
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| 73 | hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
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| 74 |
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| 75 | // get cluster and local pointer on reference process
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| 76 | xptr_t ref_xp = process->ref_xp;
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| 77 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
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| 78 | cxy_t ref_cxy = GET_CXY( ref_xp );
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| 79 |
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| 80 | // get extended pointer on cwd inode
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| 81 | xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
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| 82 |
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| 83 | // get the cwd lock in read mode from reference process
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| 84 | remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 85 |
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| 86 | // get extended pointer on remote file descriptor
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| 87 | error = vfs_lookup( cwd_xp,
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| 88 | pathname,
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| 89 | 0,
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| 90 | &file_xp );
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| 91 |
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| 92 | // release the cwd lock
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| 93 | remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 94 |
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| 95 | if( error )
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| 96 | {
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| 97 | printk("\n[ERROR] in %s : cannot found file <%s> for thread %x in process %x\n",
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| 98 | __FUNCTION__ , pathname , this->trdid , process->pid );
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| 99 | this->errno = error;
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| 100 | return -1;
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| 101 | }
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| 102 |
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| 103 | // call VFS function to get stat info
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| 104 | error = vfs_stat( file_xp,
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| 105 | &k_stat );
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| 106 | if( error )
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| 107 | {
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| 108 | printk("\n[ERROR] in %s : cannot get stats for file %s\n",
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| 109 | __FUNCTION__ , pathname );
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| 110 | this->errno = error;
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| 111 | return -1;
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| 112 | }
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| 113 |
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| 114 | // copy k_stat to u_stat
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| 115 | hal_copy_to_uspace( u_stat , &k_stat , sizeof(struct stat) );
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| 116 |
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| 117 | hal_fence();
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| 118 |
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| 119 | return 0;
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| 120 |
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| 121 | } // end sys_stat()
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| 122 |
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