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 | |
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41 | thread_t * this = CURRENT_THREAD; |
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42 | |
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43 | #if CONFIG_SYSCALL_DEBUG |
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44 | uint64_t tm_start; |
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45 | uint64_t tm_end; |
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46 | tm_start = hal_get_cycles(); |
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47 | printk("\n[DBG] %s : core[%x,%d] enter / process %x / sig %d / cycle %d\n", |
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48 | __FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)tm_start ); |
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49 | #endif |
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50 | |
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51 | // get owner process cluster and lpid |
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52 | cxy_t owner_cxy = CXY_FROM_PID( pid ); |
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53 | lpid_t lpid = LPID_FROM_PID( pid ); |
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54 | |
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55 | // check pid |
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56 | if( (lpid >= CONFIG_MAX_PROCESS_PER_CLUSTER) || cluster_is_undefined( owner_cxy ) ) |
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57 | { |
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58 | printk("\n[ERROR] in %s : illegal target PID = %d for thread %x in process %x\n", |
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59 | __FUNCTION__ , pid , this->trdid , pid ); |
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60 | this->errno = EINVAL; |
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61 | return -1; |
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62 | } |
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63 | |
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64 | // check sig_id |
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65 | if( (sig_id != SIGSTOP) && (sig_id != SIGCONT) && (sig_id != SIGKILL) ) |
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66 | { |
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67 | printk("\n[ERROR] in %s : illegal signal type for thread %x in process %x\n", |
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68 | __FUNCTION__ , sig_id , this->trdid , pid ); |
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69 | this->errno = EINVAL; |
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70 | return -1; |
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71 | } |
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72 | |
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73 | // enable IRQs |
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74 | hal_enable_irq( &save_sr ); |
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75 | |
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76 | // execute process_make_kill() function in owner cluster |
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77 | if( local_cxy == owner_cxy ) // owner is local |
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78 | { |
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79 | process_make_kill( pid , sig_id ); |
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80 | } |
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81 | else // owner is remote |
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82 | { |
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83 | rpc_process_make_kill_client( owner_cxy , pid , sig_id ); |
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84 | } |
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85 | |
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86 | // restore IRQs |
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87 | hal_restore_irq( save_sr ); |
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88 | |
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89 | hal_fence(); |
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90 | |
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91 | #if CONFIG_SYSCALL_DEBUG |
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92 | tm_end = hal_get_cycles(); |
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93 | printk("\n[DBG] %s : core[%x,%d] exit / process %x / sig %d / cost = %d\n", |
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94 | __FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)(tm_end - tm_start) ); |
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95 | #endif |
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96 | |
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97 | return 0; |
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98 | |
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99 | } // end sys_kill() |
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100 | |
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