source: trunk/kernel/syscalls/sys_kill.c@ 448

Last change on this file since 448 was 448, checked in by alain, 8 years ago

remove parasitic file <shared_syscalls.h> in directory <syscalls>
File size: 7.3 KB
Line 
1/*
2 * sys_kill.c - Kernel function implementing the "kill" system call.
3 *
4 * Author Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <kernel_config.h>
25#include <hal_types.h>
26#include <hal_irqmask.h>
27#include <errno.h>
28#include <thread.h>
29#include <printk.h>
30#include <process.h>
31#include <shared_syscalls.h>
32#include <cluster.h>
33#include <rpc.h>
34
35///////////////////////////
36int sys_kill( pid_t pid,
37 uint32_t sig_id )
38{
39 reg_t save_sr; // required to enable IRQs
40 xptr_t owner_xp; // extended pointer on process in owner cluster
41 cxy_t owner_cxy; // process owner cluster
42 process_t * owner_ptr; // local pointer on process in owner cluster
43 uint32_t retval; // return value for the switch
44 xptr_t parent_xp; // extended pointer on parent process
45 cxy_t parent_cxy; // parent process cluster
46 process_t * parent_ptr; // local pointer on parent process
47 xptr_t children_lock_xp; // extended pointer on children lock in parent
48 thread_t * parent_main_ptr; // local pointer on parent main thread
49 xptr_t parent_main_xp; // extended pointer on parent main thread
50
51 thread_t * this = CURRENT_THREAD;
52 process_t * process = this->process;
53
54#if DEBUG_SYS_KILL
55uint64_t tm_start;
56uint64_t tm_end;
57tm_start = hal_get_cycles();
58if( DEBUG_SYS_KILL < tm_start )
59printk("\n[DBG] %s : thread %x enter / process %x / sig %d / cycle %d\n",
60__FUNCTION__ , this, pid, sig_id, (uint32_t)tm_start );
61#endif
62
63 // get pointers on process descriptor in owner cluster
64 owner_xp = cluster_get_owner_process_from_pid( pid );
65 owner_cxy = GET_CXY( owner_xp );
66 owner_ptr = GET_PTR( owner_xp );
67
68#if (DEBUG_SYS_KILL & 1)
69if( DEBUG_SYS_KILL < tm_start )
70printk("\n[DBG] %s : thread %x get owner process %x in cluster %x\n",
71__FUNCTION__ , this, owner_ptr, owner_cxy );
72#endif
73
74 // check process found
75 if( owner_xp == XPTR_NULL)
76 {
77
78#if DEBUG_SYSCALLS_ERROR
79printk("\n[ERROR] in %s : process %x not found\n", __FUNCTION__, pid );
80#endif
81 this->errno = EINVAL;
82 return -1;
83 }
84
85 // process cannot kill itself
86 if( (pid == process->pid) )
87 {
88
89#if DEBUG_SYSCALLS_ERROR
90printk("\n[ERROR] in %s : process %x cannot kill itself\n", __FUNCTION__, pid );
91#endif
92 this->errno = EINVAL;
93 return -1;
94 }
95
96 // processe INIT cannot be killed
97 if( pid == 1 )
98 {
99
100#if DEBUG_SYSCALLS_ERROR
101printk("\n[ERROR] in %s : process_init cannot be killed\n", __FUNCTION__ );
102#endif
103 this->errno = EINVAL;
104 return -1;
105 }
106
107 // get parent process descriptor pointers
108 parent_xp = (xptr_t)hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) );
109 parent_cxy = GET_CXY( parent_xp );
110 parent_ptr = GET_PTR( parent_xp );
111
112#if (DEBUG_SYS_KILL & 1)
113if( DEBUG_SYS_KILL < tm_start )
114printk("\n[DBG] %s : thread %x get parent process %x in cluster %x\n",
115__FUNCTION__ , this, parent_ptr, parent_cxy );
116#endif
117
118 // get extended pointer on lock protecting children list in parent process
119 children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
120
121 // get pointers on the parent process main thread
122 parent_main_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->th_tbl[0] ) );
123 parent_main_xp = XPTR( parent_cxy , parent_main_ptr );
124
125 // analyse signal type / supported values are : 0, SIGSTOP, SIGCONT, SIGKILL
126 switch( sig_id )
127 {
128 case 0 : // does nothing
129 {
130 retval = 0;
131 break;
132 }
133 case SIGSTOP: // block all target process threads
134 {
135 // transfer TXT ownership
136 process_txt_transfer_ownership( owner_xp );
137
138 // block all threads in all clusters, but the main thread
139 process_sigaction( pid , BLOCK_ALL_THREADS );
140
141 // block the main thread
142 xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
143 thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
144
145 // atomically update owner process termination state
146 hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
147 PROCESS_TERM_STOP );
148
149 // take the children lock and unblock the parent process main thread
150 remote_spinlock_lock( children_lock_xp );
151 thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
152 remote_spinlock_unlock( children_lock_xp );
153
154 retval = 0;
155 break;
156 }
157 case SIGCONT: // unblock all target process threads
158 {
159 // unblock all threads in all clusters
160 process_sigaction( pid , UNBLOCK_ALL_THREADS );
161
162 // atomically update owner process termination state
163 hal_remote_atomic_and( XPTR( owner_cxy , &owner_ptr->term_state ) ,
164 ~PROCESS_TERM_STOP );
165 retval = 0;
166 break;
167 }
168 break;
169 case SIGKILL:
170 {
171 // remove process from TXT list
172 process_txt_detach( owner_xp );
173
174 // mark for delete all threads in all clusters, but the main
175 hal_enable_irq( &save_sr );
176 process_sigaction( pid , DELETE_ALL_THREADS );
177 hal_restore_irq( save_sr );
178
179 // block main thread
180 xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] );
181 thread_block( main_xp , THREAD_BLOCKED_GLOBAL );
182
183 // atomically update owner process descriptor term_state to ask
184 // the parent process sys_wait() function to delete this main thread
185 hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) ,
186 PROCESS_TERM_KILL );
187
188 // take the children lock and unblock the parent process main thread
189 remote_spinlock_lock( children_lock_xp );
190 thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
191 remote_spinlock_unlock( children_lock_xp );
192
193 retval = 0;
194 break;
195 }
196 default:
197 {
198
199#if DEBUG_SYSCALLS_ERROR
200printk("\n[ERROR] in %s : illegal signal %d / process %x\n", __FUNCTION__, sig_id, pid );
201#endif
202 this->errno = EINVAL;
203 retval = -1;
204 break;
205 }
206 }
207
208 hal_fence();
209
210#if DEBUG_SYS_KILL
211tm_end = hal_get_cycles();
212if( DEBUG_SYS_KILL < tm_end )
213printk("\n[DBG] %s : thread %x exit / process %x / sig %d / cost = %d / cycle %d\n",
214__FUNCTION__ , this, pid, sig_id, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
215#endif
216
217 return retval;
218
219} // end sys_kill()
220
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