[23] | 1 | /* |
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[416] | 2 | * sys_kill.c - Kernel function implementing the "kill" system call. |
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[23] | 3 | * |
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[440] | 4 | * Author Alain Greiner (2016,2017,2018) |
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[23] | 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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[409] | 26 | #include <hal_irqmask.h> |
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[23] | 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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[416] | 31 | #include <shared_syscalls.h> |
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[23] | 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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[436] | 39 | xptr_t owner_xp; // extended pointer on target process in owner cluster |
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[440] | 40 | cxy_t owner_cxy; // target process in owner cluster |
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[436] | 41 | process_t * owner_ptr; // local pointer on target process in owner cluster |
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[433] | 42 | uint32_t retval; // return value for the switch |
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[409] | 43 | |
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[416] | 44 | thread_t * this = CURRENT_THREAD; |
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[435] | 45 | process_t * process = this->process; |
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[416] | 46 | |
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[438] | 47 | #if DEBUG_SYS_KILL |
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[409] | 48 | uint64_t tm_start; |
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| 49 | uint64_t tm_end; |
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| 50 | tm_start = hal_get_cycles(); |
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[438] | 51 | if( DEBUG_SYS_KILL < tm_start ) |
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[433] | 52 | printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cycle %d\n", |
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| 53 | __FUNCTION__ , this, pid, sig_id, (uint32_t)tm_start ); |
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[409] | 54 | #endif |
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| 55 | |
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[436] | 56 | // get pointers on process descriptor in owner cluster |
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| 57 | owner_xp = cluster_get_owner_process_from_pid( pid ); |
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| 58 | owner_cxy = GET_CXY( owner_xp ); |
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| 59 | owner_ptr = GET_PTR( owner_xp ); |
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| 60 | |
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| 61 | // check process found |
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| 62 | if( owner_xp == XPTR_NULL) |
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[435] | 63 | { |
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| 64 | |
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[438] | 65 | #if DEBUG_SYSCALLS_ERROR |
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[436] | 66 | printk("\n[ERROR] in %s : process %x not found\n", __FUNCTION__, pid ); |
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[435] | 67 | #endif |
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| 68 | this->errno = EINVAL; |
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| 69 | return -1; |
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| 70 | } |
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| 71 | |
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[440] | 72 | // process cannot kill itself |
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| 73 | if( (pid == process->pid) ) |
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[23] | 74 | { |
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[433] | 75 | |
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[438] | 76 | #if DEBUG_SYSCALLS_ERROR |
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[440] | 77 | printk("\n[ERROR] in %s : process %x cannot kill itself\n", __FUNCTION__, pid ); |
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[435] | 78 | #endif |
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[421] | 79 | this->errno = EINVAL; |
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| 80 | return -1; |
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| 81 | } |
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[436] | 82 | |
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[440] | 83 | // processe INIT cannot be killed |
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[435] | 84 | if( pid == 1 ) |
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[421] | 85 | { |
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[23] | 86 | |
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[438] | 87 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 88 | printk("\n[ERROR] in %s : process_init cannot be killed\n", __FUNCTION__ ); |
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| 89 | #endif |
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[409] | 90 | this->errno = EINVAL; |
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| 91 | return -1; |
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| 92 | } |
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[23] | 93 | |
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[435] | 94 | // analyse signal type / supported values are : 0, SIGSTOP, SIGCONT, SIGKILL |
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[433] | 95 | switch( sig_id ) |
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[23] | 96 | { |
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[436] | 97 | case 0 : // does nothing |
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[433] | 98 | { |
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| 99 | retval = 0; |
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| 100 | break; |
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| 101 | } |
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[436] | 102 | case SIGSTOP: // block all target process threads |
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[433] | 103 | { |
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[436] | 104 | // transfer TXT ownership |
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| 105 | process_txt_transfer_ownership( owner_xp ); |
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[433] | 106 | |
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[436] | 107 | // block all threads in all clusters, but the main thread |
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[435] | 108 | process_sigaction( pid , BLOCK_ALL_THREADS ); |
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[433] | 109 | |
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[436] | 110 | // get pointer on target process main thread |
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| 111 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 112 | |
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| 113 | // block main thread |
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| 114 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 115 | |
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[435] | 116 | // atomically update owner process termination state |
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[433] | 117 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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[435] | 118 | PROCESS_TERM_STOP ); |
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[433] | 119 | retval = 0; |
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| 120 | break; |
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| 121 | } |
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[436] | 122 | case SIGCONT: // unblock all target process threads |
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[433] | 123 | { |
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| 124 | // unblock all threads in all clusters |
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[435] | 125 | process_sigaction( pid , UNBLOCK_ALL_THREADS ); |
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[433] | 126 | |
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[436] | 127 | // atomically update owner process termination state |
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[433] | 128 | hal_remote_atomic_and( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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[435] | 129 | ~PROCESS_TERM_STOP ); |
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[433] | 130 | retval = 0; |
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| 131 | break; |
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| 132 | } |
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| 133 | break; |
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| 134 | case SIGKILL: |
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| 135 | { |
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[436] | 136 | // remove process from TXT list |
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| 137 | process_txt_detach( owner_xp ); |
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[433] | 138 | |
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[436] | 139 | // mark for delete all process threads in all clusters, but the main |
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[435] | 140 | process_sigaction( pid , DELETE_ALL_THREADS ); |
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| 141 | |
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[436] | 142 | // get pointer on target process main thread |
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| 143 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 144 | |
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| 145 | // block main thread |
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| 146 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 147 | |
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| 148 | // atomically update owner process descriptor term_state to ask |
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| 149 | // the parent process sys_wait() function to delete this main thread |
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[435] | 150 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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| 151 | PROCESS_TERM_KILL ); |
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[433] | 152 | retval = 0; |
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| 153 | break; |
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| 154 | } |
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| 155 | default: |
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| 156 | { |
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| 157 | |
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[438] | 158 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 159 | printk("\n[ERROR] in %s : illegal signal %d / process %x\n", __FUNCTION__, sig_id, pid ); |
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| 160 | #endif |
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[433] | 161 | this->errno = EINVAL; |
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| 162 | retval = -1; |
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| 163 | break; |
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| 164 | } |
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[23] | 165 | } |
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[433] | 166 | |
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[124] | 167 | hal_fence(); |
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[23] | 168 | |
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[438] | 169 | #if DEBUG_SYS_KILL |
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[409] | 170 | tm_end = hal_get_cycles(); |
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[438] | 171 | if( DEBUG_SYS_KILL < tm_end ) |
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[436] | 172 | printk("\n[DBG] %s : thread %x exit / process %x / sig %d / cost = %d / cycle %d\n", |
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[433] | 173 | __FUNCTION__ , this, pid, sig_id, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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[409] | 174 | #endif |
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[23] | 175 | |
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[433] | 176 | return retval; |
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| 177 | |
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[23] | 178 | } // end sys_kill() |
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| 179 | |
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