source: trunk/kernel/syscalls/sys_kill.c @ 421

Last change on this file since 421 was 421, checked in by alain, 4 years ago

Introduce sys_fg() , sys_display() , sys_wait() syscalls.

File size: 3.9 KB
Line 
1/*
2 * sys_kill.c - Kernel function implementing the "kill" system call.
3 *
4 * Author    Alain Greiner (2016,2017)
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    uint32_t    save_sr;       // required to enable IRQs
40    xptr_t      process_xp;    // extended pointer on target reference process
41    cxy_t       process_cxy;   // target process cluster
42    process_t * process_ptr;   // local pointer on target process
43    xptr_t      parent_xp;     // extended pointer on parent process
44    cxy_t       parent_cxy;    // parent process cluster
45    process_t * parent_ptr;    // local pointer on parent process
46    pid_t       ppid;          // parent process PID
47
48    thread_t  * this    = CURRENT_THREAD;
49
50#if CONFIG_SYSCALL_DEBUG
51uint64_t    tm_start;
52uint64_t    tm_end;
53tm_start = hal_get_cycles();
54printk("\n[DBG] %s : core[%x,%d] enter / process %x / sig %d / cycle %d\n",
55__FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)tm_start );
56#endif
57
58    // get cluster and pointers on reference process
59    process_xp  = cluster_get_reference_process_from_pid( pid );
60    process_cxy = GET_CXY( process_xp );
61    process_ptr = (process_t *)GET_PTR( process_xp );
62
63    // check process existence
64    if( process_xp == XPTR_NULL )
65    {
66        syscall_dmsg("\n[ERROR] in %s : process %x not found\n",
67        __FUNCTION__ , pid );
68        this->errno = EINVAL;
69        return -1;
70    }
71   
72    // get parent process PID
73    parent_xp  = hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
74    parent_cxy = GET_CXY( parent_xp );
75    parent_ptr = GET_PTR( parent_xp );
76    ppid       = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
77
78    // processes INIT and processes KSH cannot be stoped or killed
79    if( ppid < 2 )
80    {
81        syscall_dmsg("\n[ERROR] in %s : process %x cannot be killed\n",
82        __FUNCTION__ , pid );
83                this->errno = EINVAL;
84        return -1;
85    }
86
87    // does nothing if sig_id == 0
88    if( sig_id == 0 )  return 0;
89   
90    // check sig_id
91    if( (sig_id != SIGSTOP) && (sig_id != SIGCONT) && (sig_id != SIGKILL) ) 
92    {
93        syscall_dmsg("\n[ERROR] in %s : illegal signal type for process %x\n",
94        __FUNCTION__ , sig_id , pid );
95                this->errno = EINVAL;
96        return -1;
97    }
98
99    // enable IRQs
100    hal_enable_irq( &save_sr );
101
102    // execute process_make_kill() function in owner cluster
103    if( local_cxy == process_cxy )                            // owner cluster is local
104    {
105        process_make_kill( pid , sig_id );
106    }
107    else                                                      // owner cluster is remote
108    {
109        rpc_process_make_kill_client( process_cxy , pid , sig_id );
110    }
111
112    // restore IRQs
113    hal_restore_irq( save_sr );
114
115    hal_fence();
116
117#if CONFIG_SYSCALL_DEBUG
118tm_end = hal_get_cycles();
119printk("\n[DBG] %s : core[%x,%d] exit / process %x / sig %d / cost = %d\n",
120__FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)(tm_end - tm_start) );
121#endif
122 
123        return 0;
124
125}  // end sys_kill()
126
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