| 1 | /* |
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| 2 | * sys_unlink.c - file unlink |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #include <hal_kernel_types.h> |
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| 24 | #include <hal_uspace.h> |
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| 25 | #include <vfs.h> |
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| 26 | #include <process.h> |
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| 27 | #include <thread.h> |
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| 28 | #include <printk.h> |
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| 29 | |
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| 30 | #include <syscalls.h> |
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| 31 | |
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| 32 | ////////////////////////////////// |
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| 33 | int sys_unlink ( const char * pathname ) |
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| 34 | { |
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| 35 | error_t error; |
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| 36 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH]; |
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| 37 | |
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| 38 | thread_t * this = CURRENT_THREAD; |
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| 39 | process_t * process = this->process; |
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| 40 | |
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| 41 | // check pathname length |
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| 42 | if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH ) |
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| 43 | { |
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| 44 | printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ ); |
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| 45 | this->errno = ENFILE; |
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| 46 | return -1; |
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| 47 | } |
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| 48 | |
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| 49 | // copy pathname in kernel space |
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| 50 | hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH ); |
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| 51 | |
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| 52 | // get cluster and local pointer on reference process |
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| 53 | xptr_t ref_xp = process->ref_xp; |
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| 54 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp ); |
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| 55 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
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| 56 | |
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| 57 | // get the cwd lock in read mode from reference process |
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| 58 | remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) ); |
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| 59 | |
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| 60 | // get extended pointer on cwd inode |
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| 61 | xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) ); |
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| 62 | |
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| 63 | // call relevant VFS function |
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| 64 | error = vfs_unlink( cwd_xp , kbuf ); |
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| 65 | |
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| 66 | // release the cwd lock in reference process |
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| 67 | remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) ); |
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| 68 | |
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| 69 | if( error ) |
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| 70 | { |
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| 71 | printk("\n[ERROR] in %s : cannot unlink file/dir %s\n", |
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| 72 | __FUNCTION__ , pathname ); |
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| 73 | this->errno = ENFILE; |
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| 74 | return -1; |
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| 75 | } |
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| 76 | |
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| 77 | return 0; |
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| 78 | |
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| 79 | } // end sys_unlink() |
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