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      1 /* Copyright (C) 2002 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, write to the Free
     16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     17    02111-1307 USA.  */
     18 
     19 #ifndef _SYS_SEM_H
     20 # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
     21 #endif
     22 
     23 #include <sys/types.h>
     24 
     25 /* Flags for `semop'.  */
     26 #define SEM_UNDO	0x1000		/* undo the operation on exit */
     27 
     28 /* Commands for `semctl'.  */
     29 #define GETPID		11		/* get sempid */
     30 #define GETVAL		12		/* get semval */
     31 #define GETALL		13		/* get all semval's */
     32 #define GETNCNT		14		/* get semncnt */
     33 #define GETZCNT		15		/* get semzcnt */
     34 #define SETVAL		16		/* set semval */
     35 #define SETALL		17		/* set all semval's */
     36 
     37 
     38 /* Data structure describing a set of semaphores.  */
     39 struct semid_ds
     40 {
     41   struct ipc_perm sem_perm;		/* operation permission struct */
     42   __time_t sem_otime;			/* last semop() time */
     43   unsigned long int __unused1;
     44   __time_t sem_ctime;			/* last time changed by semctl() */
     45   unsigned long int __unused2;
     46   unsigned long int sem_nsems;		/* number of semaphores in set */
     47   unsigned long int __unused3;
     48   unsigned long int __unused4;
     49 };
     50 
     51 /* The user should define a union like the following to use it for arguments
     52    for `semctl'.
     53 
     54    union semun
     55    {
     56      int val;				<= value for SETVAL
     57      struct semid_ds *buf;		<= buffer for IPC_STAT & IPC_SET
     58      unsigned short int *array;		<= array for GETALL & SETALL
     59      struct seminfo *__buf;		<= buffer for IPC_INFO
     60    };
     61 
     62    Previous versions of this file used to define this union but this is
     63    incorrect.  One can test the macro _SEM_SEMUN_UNDEFINED to see whether
     64    one must define the union or not.  */
     65 #define _SEM_SEMUN_UNDEFINED	1
     66 
     67 #ifdef __USE_MISC
     68 
     69 /* ipcs ctl cmds */
     70 # define SEM_STAT 18
     71 # define SEM_INFO 19
     72 
     73 struct  seminfo
     74 {
     75   int semmap;
     76   int semmni;
     77   int semmns;
     78   int semmnu;
     79   int semmsl;
     80   int semopm;
     81   int semume;
     82   int semusz;
     83   int semvmx;
     84   int semaem;
     85 };
     86 
     87 #endif /* __USE_MISC */
     88