| [1] | 1 | /* |
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| [23] | 2 | * sys_getcwd.c - get process current work directory |
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| [1] | 3 | * |
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| [23] | 4 | * Author Alain Greiner (2016,2017) |
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| [1] | 5 | * |
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| [23] | 6 | * Copyright (c) UPMC Sorbonne Universites |
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| [1] | 7 | * |
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| [23] | 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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| [1] | 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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| [23] | 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| [1] | 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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| [23] | 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| [1] | 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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| [23] | 24 | #include <kernel_config.h> |
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| 25 | #include <hal_types.h> |
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| 26 | #include <hal_uspace.h> |
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| 27 | #include <hal_special.h> |
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| 28 | #include <errno.h> |
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| [1] | 29 | #include <vfs.h> |
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| [23] | 30 | #include <vmm.h> |
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| 31 | #include <process.h> |
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| [1] | 32 | #include <thread.h> |
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| [23] | 33 | #include <printk.h> |
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| [1] | 34 | |
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| [23] | 35 | /* TODO: user page(s) need to be locked [AG] */ |
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| [1] | 36 | |
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| [23] | 37 | //////////////////////////////// |
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| 38 | int sys_getcwd ( char * buf, |
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| 39 | uint32_t nbytes ) |
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| [1] | 40 | { |
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| [23] | 41 | error_t error; |
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| 42 | paddr_t paddr; |
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| 43 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH]; |
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| [1] | 44 | |
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| [23] | 45 | thread_t * this = CURRENT_THREAD; |
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| 46 | process_t * process = this->process; |
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| [1] | 47 | |
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| [23] | 48 | // check buffer size |
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| 49 | if( nbytes < CONFIG_VFS_MAX_PATH_LENGTH ) |
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| [1] | 50 | { |
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| [23] | 51 | printk("\n[ERROR] in %s : buffer too small\n", __FUNCTION__ ); |
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| 52 | this->errno = ERANGE; |
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| 53 | return -1; |
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| [1] | 54 | } |
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| 55 | |
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| [23] | 56 | // check buffer in user space |
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| 57 | error = vmm_v2p_translate( false , buf , &paddr ); |
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| 58 | |
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| 59 | if( error ) |
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| [1] | 60 | { |
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| [23] | 61 | printk("\n[ERROR] in %s : user buffer unmapped\n", __FUNCTION__ ); |
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| 62 | this->errno = EFAULT; |
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| 63 | return -1; |
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| [1] | 64 | } |
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| 65 | |
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| [23] | 66 | // get reference process cluster and local pointer |
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| 67 | xptr_t ref_xp = process->ref_xp; |
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| 68 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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| 69 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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| [1] | 70 | |
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| [23] | 71 | // get CWD lock in read mode |
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| 72 | remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) ); |
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| [1] | 73 | |
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| [23] | 74 | // call relevant VFS function |
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| 75 | error = vfs_get_path( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) , |
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| 76 | kbuf , CONFIG_VFS_MAX_PATH_LENGTH ); |
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| [1] | 77 | |
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| [23] | 78 | // release CWD lock |
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| 79 | remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) ); |
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| [1] | 80 | |
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| [23] | 81 | // copy kernel buffer to user space |
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| 82 | hal_copy_to_uspace( buf , kbuf , CONFIG_VFS_MAX_PATH_LENGTH ); |
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| [1] | 83 | |
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| [124] | 84 | hal_fence(); |
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| [23] | 85 | |
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| 86 | return 0; |
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| 87 | |
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| 88 | } // end sys_getcwd() |
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