| 1 | /* |
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| 2 | * signal.c - User side signals related syscalls implementation. |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016,2017,2018) |
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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 | #ifndef _SIGNAL_H_ |
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| 24 | #define _SIGNAL_H_ |
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| 25 | |
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| 26 | /***************************************************************************************** |
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| 27 | * This file defines the user side, signals related library. |
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| 28 | * All these functions make a system call to access the kernel VFS. |
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| 29 | * The user/kernel shared structures and mnemonics are defined in |
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| 30 | * the <syscalls/shared_include/shared_signal.h> file. |
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| 31 | ****************************************************************************************/ |
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| 32 | |
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| 33 | #include <shared_signal.h> |
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| 34 | |
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| 35 | /***************************************************************************************** |
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| 36 | * This function associate a specific signal handler to a given signal type. |
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| 37 | * The handlers for the SIGKILL and SIGSTOP signals cannot be redefined. |
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| 38 | * TODO : this function is not implemented yet. |
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| 39 | ***************************************************************************************** |
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| 40 | * @ sig_id : index defining signal type (from 1 to 31). |
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| 41 | * @ handler : pointer on fonction implementing the specific handler. |
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| 42 | * @ return 0 if success / returns -1 if failure. |
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| 43 | ****************************************************************************************/ |
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| 44 | int signal( unsigned int sig_id, |
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| 45 | void * handler ); |
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| 46 | |
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| 47 | /***************************************************************************************** |
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| 48 | * This function implements the "kill" system call on the user side. |
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| 49 | * It register the signal defined by the <sig_id> argument in all thread descriptors |
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| 50 | * of a target process identified by the <pid> argument. This is done in all clusters |
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| 51 | * containing threads for the target process. |
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| 52 | * It can be executed by any thread running in any cluster, as this function uses |
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| 53 | * remote access to traverse the list of process copies stored in the owner cluster. |
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| 54 | * This function does nothing for (sig_id == 0). This can be used to check process pid. |
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| 55 | * The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. |
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| 56 | * TODO : only SIGKILL / SIGSTOP / SIGCONT values. |
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| 57 | ***************************************************************************************** |
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| 58 | * @ pid : target process identifier. |
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| 59 | * @ sig_id : index defining the signal type. |
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| 60 | * @ return 0 if success / returns -1 if failure. |
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| 61 | ****************************************************************************************/ |
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| 62 | int kill( unsigned int pid, |
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| 63 | unsigned int sig_id ); |
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| 64 | |
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| 65 | #endif |
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