[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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| 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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[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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[409] | 39 | uint32_t save_sr; // required to enable IRQs |
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[421] | 40 | xptr_t process_xp; // extended pointer on target reference process |
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| 41 | cxy_t process_cxy; // target process cluster |
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| 42 | process_t * process_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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[409] | 47 | |
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[416] | 48 | thread_t * this = CURRENT_THREAD; |
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| 49 | |
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[409] | 50 | #if CONFIG_SYSCALL_DEBUG |
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| 51 | uint64_t tm_start; |
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| 52 | uint64_t tm_end; |
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| 53 | tm_start = hal_get_cycles(); |
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[416] | 54 | printk("\n[DBG] %s : core[%x,%d] enter / process %x / sig %d / cycle %d\n", |
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| 55 | __FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)tm_start ); |
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[409] | 56 | #endif |
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| 57 | |
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[421] | 58 | // get cluster and pointers on reference process |
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| 59 | process_xp = cluster_get_reference_process_from_pid( pid ); |
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| 60 | process_cxy = GET_CXY( process_xp ); |
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| 61 | process_ptr = (process_t *)GET_PTR( process_xp ); |
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[23] | 62 | |
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[421] | 63 | // check process existence |
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| 64 | if( process_xp == XPTR_NULL ) |
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[23] | 65 | { |
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[421] | 66 | syscall_dmsg("\n[ERROR] in %s : process %x not found\n", |
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| 67 | __FUNCTION__ , pid ); |
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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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| 72 | // get parent process PID |
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| 73 | parent_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) ); |
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| 74 | parent_cxy = GET_CXY( parent_xp ); |
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| 75 | parent_ptr = GET_PTR( parent_xp ); |
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| 76 | ppid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) ); |
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| 77 | |
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| 78 | // processes INIT and processes KSH cannot be stoped or killed |
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| 79 | if( ppid < 2 ) |
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| 80 | { |
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| 81 | syscall_dmsg("\n[ERROR] in %s : process %x cannot be killed\n", |
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| 82 | __FUNCTION__ , pid ); |
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[23] | 83 | this->errno = EINVAL; |
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| 84 | return -1; |
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| 85 | } |
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| 86 | |
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[421] | 87 | // does nothing if sig_id == 0 |
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| 88 | if( sig_id == 0 ) return 0; |
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| 89 | |
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[409] | 90 | // check sig_id |
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| 91 | if( (sig_id != SIGSTOP) && (sig_id != SIGCONT) && (sig_id != SIGKILL) ) |
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| 92 | { |
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[421] | 93 | syscall_dmsg("\n[ERROR] in %s : illegal signal type for process %x\n", |
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| 94 | __FUNCTION__ , sig_id , pid ); |
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[409] | 95 | this->errno = EINVAL; |
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| 96 | return -1; |
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| 97 | } |
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[23] | 98 | |
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[409] | 99 | // enable IRQs |
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| 100 | hal_enable_irq( &save_sr ); |
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[23] | 101 | |
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[409] | 102 | // execute process_make_kill() function in owner cluster |
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[421] | 103 | if( local_cxy == process_cxy ) // owner cluster is local |
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[23] | 104 | { |
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[416] | 105 | process_make_kill( pid , sig_id ); |
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[23] | 106 | } |
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[421] | 107 | else // owner cluster is remote |
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[409] | 108 | { |
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[421] | 109 | rpc_process_make_kill_client( process_cxy , pid , sig_id ); |
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[409] | 110 | } |
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[23] | 111 | |
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[409] | 112 | // restore IRQs |
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| 113 | hal_restore_irq( save_sr ); |
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[23] | 114 | |
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[124] | 115 | hal_fence(); |
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[23] | 116 | |
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[409] | 117 | #if CONFIG_SYSCALL_DEBUG |
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| 118 | tm_end = hal_get_cycles(); |
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[416] | 119 | printk("\n[DBG] %s : core[%x,%d] exit / process %x / sig %d / cost = %d\n", |
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| 120 | __FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)(tm_end - tm_start) ); |
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[409] | 121 | #endif |
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| 122 | |
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[23] | 123 | return 0; |
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| 124 | |
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| 125 | } // end sys_kill() |
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| 126 | |
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