source: trunk/kernel/syscalls/sys_fg.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: 2.6 KB
Line 
1/*
2 * sys_fg.c - Kernel function implementing the "fg" 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_fg( pid_t    pid )
37{
38    xptr_t      process_xp;
39    process_t * process_ptr;
40    cxy_t       process_cxy;
41    xptr_t      chdev_xp;
42    chdev_t   * chdev_ptr;
43    cxy_t       chdev_cxy;
44
45    thread_t  * this    = CURRENT_THREAD;
46
47#if CONFIG_SYSCALL_DEBUG
48uint64_t    tm_start;
49uint64_t    tm_end;
50tm_start = hal_get_cycles();
51printk("\n[DBG] %s : core[%x,%d] enter / process %x / cycle %d\n",
52__FUNCTION__ , local_cxy , this->core->lid , pid, (uint32_t)tm_start );
53#endif
54
55    // check process existence
56    process_xp = cluster_get_reference_process_from_pid( pid );
57
58    if( process_xp == XPTR_NULL )
59    {
60        syscall_dmsg("\n[ERROR] in %s : process %x not found\n",
61        __FUNCTION__ , pid );
62        this->errno = EINVAL;
63        return -1;
64    }
65   
66    // get reference process cluster and local pointer
67    process_ptr = (process_t *)GET_PTR( process_xp );
68    process_cxy = GET_CXY( process_xp );
69 
70    // get extended pointer on TXT_RX chdev
71    chdev_xp = chdev_from_file( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
72
73    // get chdev cluster and local pointer
74    chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
75    chdev_cxy = GET_CXY( chdev_xp );
76
77    // set reference process owner in TXT_RX chdev
78    hal_remote_swd( XPTR( chdev_cxy , &chdev_ptr->ext.txt.owner_xp ) , process_xp );
79
80    hal_fence();
81
82#if CONFIG_SYSCALL_DEBUG
83tm_end = hal_get_cycles();
84printk("\n[DBG] %s : core[%x,%d] exit / process %x / cost = %d\n",
85__FUNCTION__ , local_cxy , this->core->lid , pid, (uint32_t)(tm_end - tm_start) );
86#endif
87 
88        return 0;
89
90}  // end sys_kill()
91
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