1 /* Copyright (C) 1995-2022 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 #include <bits/ipctypes.h> 24 25 /* Define options for message queue functions. */ 26 #define MSG_NOERROR 010000 /* no error if message is too big */ 27 #ifdef __USE_GNU 28 # define MSG_EXCEPT 020000 /* recv any msg except of specified type */ 29 #endif 30 31 /* Types used in the structure definition. */ 32 typedef unsigned short int msgqnum_t; 33 typedef unsigned short int msglen_t; 34 35 36 /* Structure of record for one message inside the kernel. 37 The type `struct msg' is opaque. */ 38 struct msqid_ds 39 { 40 struct ipc_perm msg_perm; /* structure describing operation permission */ 41 struct msg *__msg_first; /* pointer to first message on queue */ 42 struct msg *__msg_last; /* pointer to last message on queue */ 43 __time_t msg_stime; /* time of last msgsnd command */ 44 __time_t msg_rtime; /* time of last msgrcv command */ 45 __time_t msg_ctime; /* time of last change */ 46 struct __wait_queue *__wwait; /* ??? */ 47 struct __wait_queue *__rwait; /* ??? */ 48 unsigned short int __msg_cbytes;/* current number of bytes on queue */ 49 msgqnum_t msg_qnum; /* number of messages currently on queue */ 50 msglen_t msg_qbytes; /* max number of bytes allowed on queue */ 51 __ipc_pid_t msg_lspid; /* pid of last msgsnd() */ 52 __ipc_pid_t msg_lrpid; /* pid of last msgrcv() */ 53 }; 54 55 #ifdef __USE_MISC 56 57 # define msg_cbytes __msg_cbytes 58 59 /* ipcs ctl commands */ 60 # define MSG_STAT 11 61 # define MSG_INFO 12 62 63 /* buffer for msgctl calls IPC_INFO, MSG_INFO */ 64 struct msginfo 65 { 66 int msgpool; 67 int msgmap; 68 int msgmax; 69 int msgmnb; 70 int msgmni; 71 int msgssz; 72 int msgtql; 73 unsigned short int msgseg; 74 }; 75 76 #endif /* __USE_MISC */ 77