| 1 | /*
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| 2 | * sys_fg.c - Kernel function implementing the "fg" 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_fg( pid_t pid )
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| 37 | {
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| 38 | xptr_t process_xp; // extended pointer on reference process descriptor
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| 39 | process_t * process_ptr;
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| 40 | cxy_t process_cxy;
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| 41 | xptr_t file_xp; // extended pointer on STDIN file descriptor
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| 42 | xptr_t chdev_xp; // extended pointer on TXT0_RX chdev
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| 43 | chdev_t * chdev_ptr;
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| 44 | cxy_t chdev_cxy;
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| 45 |
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| 46 | thread_t * this = CURRENT_THREAD;
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| 47 |
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| 48 | #if DEBUG_SYS_FG
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| 49 | uint64_t tm_start;
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| 50 | uint64_t tm_end;
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| 51 | tm_start = hal_get_cycles();
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| 52 | if( DEBUG_SYS_FG < tm_start )
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| 53 | printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
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| 54 | __FUNCTION__ , CURRENT_THREAD , pid, (uint32_t)tm_start );
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| 55 | #endif
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| 56 |
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| 57 | // check process existence
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| 58 | process_xp = cluster_get_reference_process_from_pid( pid );
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| 59 |
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| 60 | if( process_xp == XPTR_NULL )
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| 61 | {
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| 62 |
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| 63 | #if DEBUG_SYSCALLS_ERROR
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| 64 | printk("\n[ERROR] in %s : process %x not found\n", __FUNCTION__ , pid );
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| 65 | #endif
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| 66 | this->errno = EINVAL;
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| 67 | return -1;
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| 68 | }
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| 69 |
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| 70 | // get reference process cluster and local pointer
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| 71 | process_ptr = (process_t *)GET_PTR( process_xp );
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| 72 | process_cxy = GET_CXY( process_xp );
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| 73 |
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| 74 | // get extended pointer on the reference process STDIN file descriptor
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| 75 | file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
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| 76 |
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| 77 | // get extended pointer on TXT_RX chdev
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| 78 | chdev_xp = chdev_from_file( file_xp );
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| 79 |
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| 80 | // get chdev cluster and local pointer
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| 81 | chdev_ptr = GET_PTR( chdev_xp );
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| 82 | chdev_cxy = GET_CXY( chdev_xp );
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| 83 |
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| 84 | // set reference process owner in TXT_RX chdev
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| 85 | hal_remote_swd( XPTR( chdev_cxy , &chdev_ptr->ext.txt.owner_xp ) , process_xp );
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| 86 |
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| 87 | hal_fence();
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| 88 |
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| 89 | #if DEBUG_SYS_FG
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| 90 | tm_end = hal_get_cycles();
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| 91 | if( DEBUG_SYS_FG < tm_end )
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| 92 | printk("\n[DBG] %s : thread %x exit / process %x get TXT_%d ownership / cycle %d\n",
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| 93 | __FUNCTION__ , CURRENT_THREAD , pid,
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| 94 | hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) ) , (uint32_t)tm_end );
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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_fg()
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| 100 |
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