| 1 | /* |
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| 2 | * kern/sys_open.c - open a named file |
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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 <errno.h> |
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| 24 | #include <thread.h> |
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| 25 | #include <vfs.h> |
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| 26 | #include <sys-vfs.h> |
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| 27 | #include <process.h> |
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| 28 | #include <spinlock.h> |
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| 29 | #include <cpu-trace.h> |
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| 30 | |
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| 31 | /////////////////////////////////// |
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| 32 | int sys_open ( char * pathname, |
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| 33 | uint32_t flags, |
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| 34 | uint32_t mode ) |
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| 35 | { |
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| 36 | CPU_HW_TRACE(sys_open); |
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| 37 | |
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| 38 | error_t err; |
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| 39 | struct vfs_file_s file; |
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| 40 | struct ku_obj ku_path; |
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| 41 | thread_t * this = current_thread; |
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| 42 | process_t * process = current_process; |
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| 43 | uint32_t fd = (uint32_t)-1; |
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| 44 | |
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| 45 | cpu_trace_write(current_cpu, sys_open); |
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| 46 | |
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| 47 | if( process_fd_aray_full( process ) ) |
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| 48 | { |
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| 49 | this->info.errno = ENFILE; |
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| 50 | CPU_HW_TRACE(sys_open); |
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| 51 | return fd; |
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| 52 | } |
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| 53 | |
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| 54 | if( VFS_IS( flags , VFS_O_DIRECTORY ) ) VFS_SET( flags , VFS_DIR ); |
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| 55 | |
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| 56 | KU_BUFF( ku_path , pathname ); |
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| 57 | |
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| 58 | // get the cwd lock |
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| 59 | rwlock_rdlock( &process->cwd_lock ); |
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| 60 | |
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| 61 | err = vfs_open( &process->vfs_cwd , &ku_path , flags , mode , &file ); |
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| 62 | if( err ) |
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| 63 | { |
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| 64 | this->info.errno = (err < 0 ) ? -err : err; |
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| 65 | rwlock_unlock( &process->cwd_lock ); |
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| 66 | CPU_HW_TRACE(sys_open); |
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| 67 | return fd; |
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| 68 | } |
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| 69 | |
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| 70 | err = process_fd_set( process , &file , &fd ); |
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| 71 | if( err ) |
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| 72 | { |
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| 73 | vfs_close(&file, NULL); |
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| 74 | this->info.errno = err; |
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| 75 | } |
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| 76 | |
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| 77 | rwlock_unlock( &process->cwd_lock ); |
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| 78 | CPU_HW_TRACE(sys_open); |
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| 79 | return fd; |
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| 80 | } |
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