| 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_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 | //////////////////////////////////
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| 31 | int sys_unlink ( char * pathname )
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| 32 | {
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| 33 | error_t error;
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| 34 | uint32_t length;
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| 35 | char kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
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| 36 |
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| 37 | thread_t * this = CURRENT_THREAD;
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| 38 | process_t * process = this->process;
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| 39 |
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| 40 | // get pathname length
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| 41 | length = hal_strlen_from_uspace( pathname );
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| 42 |
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| 43 | if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
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| 44 | {
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| 45 | printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
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| 46 | this->errno = ENFILE;
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| 47 | return -1;
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| 48 | }
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| 49 |
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| 50 | // get pathname copy in kernel space
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| 51 | hal_copy_from_uspace( kbuf, pathname, length );
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| 52 |
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| 53 | // get cluster and local pointer on reference process
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| 54 | xptr_t ref_xp = process->ref_xp;
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| 55 | process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
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| 56 | cxy_t ref_cxy = GET_CXY( ref_xp );
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| 57 |
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| 58 | // get the cwd lock in read mode from reference process
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| 59 | remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 60 |
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| 61 | // get extended pointer on cwd inode
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| 62 | xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
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| 63 |
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| 64 | // call relevant VFS function
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| 65 | error = vfs_unlink( cwd_xp , kbuf );
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| 66 |
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| 67 | // release the cwd lock in reference process
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| 68 | remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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| 69 |
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| 70 | if( error )
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| 71 | {
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| 72 | printk("\n[ERROR] in %s : cannot unlink file/dir %s\n",
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| 73 | __FUNCTION__ , pathname );
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| 74 | this->errno = ENFILE;
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| 75 | return -1;
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| 76 | }
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| 77 |
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| 78 | return 0;
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| 79 |
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| 80 | } // end sys_unlink()
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