| 1 | /* |
|---|
| 2 | * sys_close.c close an open file |
|---|
| 3 | * |
|---|
| 4 | * Author Alain Greiner (2016,2017) |
|---|
| 5 | * |
|---|
| 6 | * Copyright (c) UPMC Sorbonne Universites |
|---|
| 7 | * |
|---|
| 8 | * This file is part of ALMOS-MKH. |
|---|
| 9 | * |
|---|
| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
|---|
| 11 | * under the terms of the GNU General Public License as published by |
|---|
| 12 | * the Free Software Foundation; version 2.0 of the License. |
|---|
| 13 | * |
|---|
| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
|---|
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 17 | * General Public License for more details. |
|---|
| 18 | * |
|---|
| 19 | * You should have received a copy of the GNU General Public License |
|---|
| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
|---|
| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|---|
| 22 | */ |
|---|
| 23 | |
|---|
| 24 | #include <kernel_config.h> |
|---|
| 25 | #include <hal_kernel_types.h> |
|---|
| 26 | #include <hal_special.h> |
|---|
| 27 | #include <vfs.h> |
|---|
| 28 | #include <process.h> |
|---|
| 29 | #include <thread.h> |
|---|
| 30 | #include <printk.h> |
|---|
| 31 | |
|---|
| 32 | ////////////////////////////////// |
|---|
| 33 | int sys_close ( uint32_t file_id ) |
|---|
| 34 | { |
|---|
| 35 | error_t error; |
|---|
| 36 | xptr_t file_xp; |
|---|
| 37 | |
|---|
| 38 | thread_t * this = CURRENT_THREAD; |
|---|
| 39 | process_t * process = this->process; |
|---|
| 40 | |
|---|
| 41 | #if DEBUG_SYS_CLOSE |
|---|
| 42 | uint32_t tm_start; |
|---|
| 43 | uint32_t tm_end; |
|---|
| 44 | tm_start = hal_get_cycles(); |
|---|
| 45 | if( DEBUG_SYS_CLOSE < tm_start ) |
|---|
| 46 | printk("\n[DBG] %s : thread %x in process %x enter / fdid %d / cycle %d\n", |
|---|
| 47 | __FUNCTION__, this->trdid, process->pid, file_id, (uint32_t)tm_start ); |
|---|
| 48 | #endif |
|---|
| 49 | |
|---|
| 50 | // check file_id argument |
|---|
| 51 | if( file_id >= CONFIG_PROCESS_FILE_MAX_NR ) |
|---|
| 52 | { |
|---|
| 53 | printk("\n[ERROR] in %s : illegal file descriptor index = %d\n", |
|---|
| 54 | __FUNCTION__ , file_id ); |
|---|
| 55 | this->errno = EBADFD; |
|---|
| 56 | return -1; |
|---|
| 57 | } |
|---|
| 58 | |
|---|
| 59 | // get extended pointer on remote file descriptor |
|---|
| 60 | file_xp = process_fd_get_xptr( process , file_id ); |
|---|
| 61 | |
|---|
| 62 | if( file_xp == XPTR_NULL ) |
|---|
| 63 | { |
|---|
| 64 | printk("\n[ERROR] in %s : undefined file descriptor = %d\n", |
|---|
| 65 | __FUNCTION__ , file_id ); |
|---|
| 66 | this->errno = EBADFD; |
|---|
| 67 | return -1; |
|---|
| 68 | } |
|---|
| 69 | |
|---|
| 70 | // call the relevant VFS function |
|---|
| 71 | error = vfs_close( file_xp , file_id ); |
|---|
| 72 | |
|---|
| 73 | if( error ) |
|---|
| 74 | { |
|---|
| 75 | printk("\n[ERROR] in %s : cannot close file descriptor = %d\n", |
|---|
| 76 | __FUNCTION__ , file_id ); |
|---|
| 77 | this->errno = error; |
|---|
| 78 | return -1; |
|---|
| 79 | } |
|---|
| 80 | |
|---|
| 81 | hal_fence(); |
|---|
| 82 | |
|---|
| 83 | #if DEBUG_SYS_CLOSE |
|---|
| 84 | tm_end = hal_get_cycles(); |
|---|
| 85 | if( DEBUG_SYS_CLOSE < tm_start ) |
|---|
| 86 | printk("\n[DBG] %s : thread %x in process %x exit / cost %d / cycle %d\n", |
|---|
| 87 | __FUNCTION__, this->trdid, process->pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_start ); |
|---|
| 88 | #endif |
|---|
| 89 | |
|---|
| 90 | return 0; |
|---|
| 91 | } |
|---|
