1 /* Copyright (C) 1995-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_MSG_H 19 #error "Never use <bits/msq.h> directly; include <sys/msg.h> instead." 20 #endif 21 22 #include <bits/types.h> 23 24 /* Define options for message queue functions. */ 25 #define MSG_NOERROR 010000 /* no error if message is too big */ 26 27 /* Types used in the structure definition. */ 28 typedef unsigned short int msgqnum_t; 29 typedef unsigned short int msglen_t; 30 31 32 /* Structure of record for one message inside the kernel. 33 The type `struct __msg' is opaque. */ 34 struct msqid_ds 35 { 36 struct ipc_perm msg_perm; /* structure describing operation permission */ 37 __time_t msg_stime; /* time of last msgsnd command */ 38 __time_t msg_rtime; /* time of last msgrcv command */ 39 __time_t msg_ctime; /* time of last change */ 40 msgqnum_t msg_qnum; /* number of messages currently on queue */ 41 msglen_t msg_qbytes; /* max number of bytes allowed on queue */ 42 __pid_t msg_lspid; /* pid of last msgsnd() */ 43 __pid_t msg_lrpid; /* pid of last msgrcv() */ 44 }; 45