source: trunk/kernel/syscalls/sys_kill.c @ 416

Last change on this file since 416 was 416, checked in by alain, 4 years ago

Improve sys_exec.

File size: 2.9 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
41    thread_t  * this    = CURRENT_THREAD;
42
43#if CONFIG_SYSCALL_DEBUG
44uint64_t    tm_start;
45uint64_t    tm_end;
46tm_start = hal_get_cycles();
47printk("\n[DBG] %s : core[%x,%d] enter / process %x / sig %d / cycle %d\n",
48__FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)tm_start );
49#endif
50
51    // get owner process cluster and lpid
52    cxy_t   owner_cxy  = CXY_FROM_PID( pid );
53    lpid_t  lpid       = LPID_FROM_PID( pid );
54
55    // check pid
56    if( (lpid >= CONFIG_MAX_PROCESS_PER_CLUSTER) || cluster_is_undefined( owner_cxy ) )
57    {
58        printk("\n[ERROR] in %s : illegal target PID = %d for thread %x in process %x\n",
59        __FUNCTION__ , pid , this->trdid , pid );
60                this->errno = EINVAL;
61        return -1;
62    }
63
64    // check sig_id
65    if( (sig_id != SIGSTOP) && (sig_id != SIGCONT) && (sig_id != SIGKILL) ) 
66    {
67        printk("\n[ERROR] in %s : illegal signal type for thread %x in process %x\n",
68        __FUNCTION__ , sig_id , this->trdid , pid );
69                this->errno = EINVAL;
70        return -1;
71    }
72
73    // enable IRQs
74    hal_enable_irq( &save_sr );
75
76    // execute process_make_kill() function in owner cluster
77    if( local_cxy == owner_cxy )                                // owner is local
78    {
79        process_make_kill( pid , sig_id );
80    }
81    else                                                        // owner is remote
82    {
83        rpc_process_make_kill_client( owner_cxy , pid , sig_id );
84    }
85
86    // restore IRQs
87    hal_restore_irq( save_sr );
88
89    hal_fence();
90
91#if CONFIG_SYSCALL_DEBUG
92tm_end = hal_get_cycles();
93printk("\n[DBG] %s : core[%x,%d] exit / process %x / sig %d / cost = %d\n",
94__FUNCTION__ , local_cxy , this->core->lid , pid, sig_id, (uint32_t)(tm_end - tm_start) );
95#endif
96 
97        return 0;
98
99}  // end sys_kill()
100
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