1 | /* |
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2 | * sys_kill.c - Kernel function implementing the "kill" system call. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017) |
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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_types.h> |
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26 | #include <hal_irqmask.h> |
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27 | #include <errno.h> |
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28 | #include <thread.h> |
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29 | #include <printk.h> |
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30 | #include <process.h> |
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31 | #include <shared_syscalls.h> |
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32 | #include <cluster.h> |
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33 | #include <rpc.h> |
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34 | |
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35 | /////////////////////////// |
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36 | int sys_kill( pid_t pid, |
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37 | uint32_t sig_id ) |
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38 | { |
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39 | uint32_t save_sr; // required to enable IRQs |
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40 | xptr_t owner_xp; // extended pointer on target reference process |
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41 | cxy_t owner_cxy; // target process cluster |
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42 | process_t * owner_ptr; // local pointer on target process |
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43 | xptr_t parent_xp; // extended pointer on parent process |
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44 | cxy_t parent_cxy; // parent process cluster |
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45 | process_t * parent_ptr; // local pointer on parent process |
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46 | pid_t ppid; // parent process PID |
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47 | uint32_t retval; // return value for the switch |
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48 | |
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49 | thread_t * this = CURRENT_THREAD; |
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50 | |
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51 | #if CONFIG_DEBUG_SYS_KILL |
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52 | uint64_t tm_start; |
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53 | uint64_t tm_end; |
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54 | tm_start = hal_get_cycles(); |
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55 | if( CONFIG_DEBUG_SYS_KILL < tm_start ) |
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56 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cycle %d\n", |
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57 | __FUNCTION__ , this, pid, sig_id, (uint32_t)tm_start ); |
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58 | #endif |
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59 | |
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60 | // get cluster and pointers on owner process |
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61 | owner_xp = cluster_get_owner_process_from_pid( pid ); |
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62 | owner_cxy = GET_CXY( owner_xp ); |
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63 | owner_ptr = GET_PTR( owner_xp ); |
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64 | |
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65 | // check process existence |
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66 | if( owner_xp == XPTR_NULL ) |
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67 | { |
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68 | |
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69 | syscall_dmsg("\n[ERROR] in %s : process %x not found\n", __FUNCTION__ , pid ); |
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70 | |
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71 | this->errno = EINVAL; |
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72 | return -1; |
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73 | } |
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74 | |
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75 | // get parent process PID |
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76 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
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77 | parent_cxy = GET_CXY( parent_xp ); |
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78 | parent_ptr = GET_PTR( parent_xp ); |
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79 | ppid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) ); |
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80 | |
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81 | // processes INIT and processes KSH cannot be stoped or killed |
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82 | if( ppid < 2 ) |
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83 | { |
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84 | |
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85 | syscall_dmsg("\n[ERROR] in %s : process %x cannot be killed\n", __FUNCTION__ , pid ); |
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86 | |
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87 | this->errno = EINVAL; |
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88 | return -1; |
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89 | } |
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90 | |
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91 | // enable IRQs |
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92 | hal_enable_irq( &save_sr ); |
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93 | |
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94 | // analyse signal type |
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95 | // supported values are : 0, SIGSTOP, SIGCONT, SIGKILL |
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96 | switch( sig_id ) |
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97 | { |
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98 | case 0 : |
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99 | { |
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100 | // does nothing |
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101 | retval = 0; |
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102 | break; |
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103 | } |
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104 | case SIGSTOP: |
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105 | { |
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106 | // remove TXT ownership from target process |
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107 | process_txt_reset_ownership( owner_xp ); |
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108 | |
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109 | // block all threads in all clusters |
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110 | process_sigaction( owner_ptr , BLOCK_ALL_THREADS ); |
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111 | |
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112 | // atomically update reference process termination state |
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113 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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114 | PROCESS_FLAG_BLOCK ); |
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115 | |
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116 | retval = 0; |
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117 | break; |
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118 | } |
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119 | case SIGCONT: |
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120 | { |
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121 | // unblock all threads in all clusters |
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122 | process_sigaction( owner_ptr , UNBLOCK_ALL_THREADS ); |
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123 | |
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124 | // atomically update reference process termination state |
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125 | hal_remote_atomic_and( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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126 | ~PROCESS_FLAG_BLOCK ); |
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127 | retval = 0; |
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128 | break; |
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129 | } |
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130 | break; |
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131 | case SIGKILL: |
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132 | { |
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133 | // the process_make_kill() function must be executed |
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134 | // by an RPC thread in process owner cluster |
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135 | // It deletes all target process threads in all clusters, |
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136 | // and updates the process termination state |
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137 | rpc_process_make_kill_client( owner_cxy , owner_ptr , false , 0 ); |
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138 | |
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139 | retval = 0; |
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140 | break; |
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141 | } |
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142 | default: |
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143 | { |
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144 | |
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145 | syscall_dmsg("\n[ERROR] in %s : illegal signal type %d for process %x\n", |
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146 | __FUNCTION__ , sig_id , pid ); |
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147 | |
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148 | this->errno = EINVAL; |
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149 | retval = -1; |
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150 | break; |
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151 | } |
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152 | } |
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153 | |
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154 | // restore IRQs |
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155 | hal_restore_irq( save_sr ); |
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156 | |
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157 | hal_fence(); |
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158 | |
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159 | #if CONFIG_DEBUG_SYS_KILL |
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160 | tm_end = hal_get_cycles(); |
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161 | if( CONFIG_DEBUG_SYS_KILL < tm_end ) |
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162 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cost = %d / cycle %d\n", |
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163 | __FUNCTION__ , this, pid, sig_id, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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164 | #endif |
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165 | |
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166 | return retval; |
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167 | |
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168 | } // end sys_kill() |
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169 | |
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