1 | /* |
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2 | * sys_isatty.c - test if a file descriptor is a TXT device. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017,2018) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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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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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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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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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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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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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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24 | #include <kernel_config.h> |
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25 | #include <hal_kernel_types.h> |
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26 | #include <hal_uspace.h> |
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27 | #include <hal_irqmask.h> |
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28 | #include <hal_special.h> |
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29 | #include <errno.h> |
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30 | #include <vfs.h> |
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31 | #include <vmm.h> |
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32 | #include <chdev.h> |
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33 | #include <thread.h> |
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34 | #include <printk.h> |
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35 | #include <process.h> |
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36 | |
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37 | #include <syscalls.h> |
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38 | |
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39 | //////////////////////////////////// |
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40 | int sys_isatty( uint32_t file_id ) |
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41 | { |
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42 | xptr_t file_xp; // extended pointer on remote file descriptor |
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43 | xptr_t chdev_xp; // extended pointer on remote chdev |
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44 | cxy_t chdev_cxy; |
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45 | chdev_t * chdev_ptr; |
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46 | uint32_t chdev_func; |
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47 | int retval; |
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48 | |
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49 | thread_t * this = CURRENT_THREAD; |
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50 | process_t * process = this->process; |
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51 | |
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52 | #if DEBUG_SYS_ISATTY |
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53 | uint64_t tm_start; |
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54 | uint64_t tm_end; |
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55 | tm_start = hal_get_cycles(); |
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56 | if( DEBUG_SYS_ISATTY < tm_start ) |
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57 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n" |
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58 | __FUNCTION__ , this, process->pid, (uint32_t)tm_start ); |
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59 | #endif |
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60 | |
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61 | // check file_id argument |
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62 | if( file_id >= CONFIG_PROCESS_FILE_MAX_NR ) |
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63 | { |
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64 | |
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65 | #if DEBUG_SYSCALLS_ERROR |
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66 | printk("\n[ERROR] in %s : illegal file descriptor index = %d\n", __FUNCTION__ , file_id ); |
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67 | #endif |
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68 | this->errno = EBADFD; |
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69 | return -1; |
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70 | } |
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71 | |
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72 | // get extended pointer on remote file descriptor |
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73 | file_xp = process_fd_get_xptr_from_local( process , file_id ); |
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74 | |
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75 | if( file_xp == XPTR_NULL ) |
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76 | { |
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77 | |
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78 | #if DEBUG_SYSCALLS_ERROR |
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79 | printk("\n[ERROR] in %s : undefined fd_id %d in process %x\n", |
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80 | __FUNCTION__ , file_id , process->pid ); |
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81 | #endif |
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82 | this->errno = EBADFD; |
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83 | return -1; |
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84 | } |
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85 | |
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86 | // get file descriptor cluster and local pointer |
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87 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
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88 | cxy_t file_cxy = GET_CXY( file_xp ); |
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89 | |
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90 | // get file type |
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91 | vfs_inode_type_t type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) ); |
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92 | |
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93 | // action depend on file type |
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94 | if( type != INODE_TYPE_DEV ) // not a device |
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95 | { |
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96 | retval = 0; |
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97 | } |
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98 | else // it is a device |
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99 | { |
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100 | // get cluster and pointers on chdev |
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101 | chdev_xp = chdev_from_file( file_xp ); |
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102 | chdev_cxy = GET_CXY( chdev_xp ); |
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103 | chdev_ptr = GET_PTR( chdev_xp ); |
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104 | |
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105 | // get chdev type |
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106 | chdev_func = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->func ) ); |
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107 | |
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108 | if( chdev_func == DEV_FUNC_TXT ) retval = 1; |
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109 | else retval = 0; |
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110 | } |
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111 | |
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112 | #if DEBUG_SYS_ISATTY |
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113 | tm_end = hal_get_cycles(); |
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114 | if( DEBUG_SYS_ISATTY < tm_end ) |
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115 | printk("\n[DBG] %s : thread %x exit / process %x / cost %d / cycle %d\n", |
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116 | __FUNCTION__, this, process->pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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117 | #endif |
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118 | |
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119 | return retval; |
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120 | |
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121 | } // end sys_read() |
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