1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun #ifndef _UAPI_LINUX_SEM_H 3*4882a593Smuzhiyun #define _UAPI_LINUX_SEM_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/ipc.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* semop flags */ 8*4882a593Smuzhiyun #define SEM_UNDO 0x1000 /* undo the operation on exit */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun /* semctl Command Definitions. */ 11*4882a593Smuzhiyun #define GETPID 11 /* get sempid */ 12*4882a593Smuzhiyun #define GETVAL 12 /* get semval */ 13*4882a593Smuzhiyun #define GETALL 13 /* get all semval's */ 14*4882a593Smuzhiyun #define GETNCNT 14 /* get semncnt */ 15*4882a593Smuzhiyun #define GETZCNT 15 /* get semzcnt */ 16*4882a593Smuzhiyun #define SETVAL 16 /* set semval */ 17*4882a593Smuzhiyun #define SETALL 17 /* set all semval's */ 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun /* ipcs ctl cmds */ 20*4882a593Smuzhiyun #define SEM_STAT 18 21*4882a593Smuzhiyun #define SEM_INFO 19 22*4882a593Smuzhiyun #define SEM_STAT_ANY 20 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun /* Obsolete, used only for backwards compatibility and libc5 compiles */ 25*4882a593Smuzhiyun struct semid_ds { 26*4882a593Smuzhiyun struct ipc_perm sem_perm; /* permissions .. see ipc.h */ 27*4882a593Smuzhiyun __kernel_old_time_t sem_otime; /* last semop time */ 28*4882a593Smuzhiyun __kernel_old_time_t sem_ctime; /* create/last semctl() time */ 29*4882a593Smuzhiyun struct sem *sem_base; /* ptr to first semaphore in array */ 30*4882a593Smuzhiyun struct sem_queue *sem_pending; /* pending operations to be processed */ 31*4882a593Smuzhiyun struct sem_queue **sem_pending_last; /* last pending operation */ 32*4882a593Smuzhiyun struct sem_undo *undo; /* undo requests on this array */ 33*4882a593Smuzhiyun unsigned short sem_nsems; /* no. of semaphores in array */ 34*4882a593Smuzhiyun }; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* Include the definition of semid64_ds */ 37*4882a593Smuzhiyun #include <asm/sembuf.h> 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun /* semop system calls takes an array of these. */ 40*4882a593Smuzhiyun struct sembuf { 41*4882a593Smuzhiyun unsigned short sem_num; /* semaphore index in array */ 42*4882a593Smuzhiyun short sem_op; /* semaphore operation */ 43*4882a593Smuzhiyun short sem_flg; /* operation flags */ 44*4882a593Smuzhiyun }; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun /* arg for semctl system calls. */ 47*4882a593Smuzhiyun union semun { 48*4882a593Smuzhiyun int val; /* value for SETVAL */ 49*4882a593Smuzhiyun struct semid_ds __user *buf; /* buffer for IPC_STAT & IPC_SET */ 50*4882a593Smuzhiyun unsigned short __user *array; /* array for GETALL & SETALL */ 51*4882a593Smuzhiyun struct seminfo __user *__buf; /* buffer for IPC_INFO */ 52*4882a593Smuzhiyun void __user *__pad; 53*4882a593Smuzhiyun }; 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun struct seminfo { 56*4882a593Smuzhiyun int semmap; 57*4882a593Smuzhiyun int semmni; 58*4882a593Smuzhiyun int semmns; 59*4882a593Smuzhiyun int semmnu; 60*4882a593Smuzhiyun int semmsl; 61*4882a593Smuzhiyun int semopm; 62*4882a593Smuzhiyun int semume; 63*4882a593Smuzhiyun int semusz; 64*4882a593Smuzhiyun int semvmx; 65*4882a593Smuzhiyun int semaem; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun /* 69*4882a593Smuzhiyun * SEMMNI, SEMMSL and SEMMNS are default values which can be 70*4882a593Smuzhiyun * modified by sysctl. 71*4882a593Smuzhiyun * The values has been chosen to be larger than necessary for any 72*4882a593Smuzhiyun * known configuration. 73*4882a593Smuzhiyun * 74*4882a593Smuzhiyun * SEMOPM should not be increased beyond 1000, otherwise there is the 75*4882a593Smuzhiyun * risk that semop()/semtimedop() fails due to kernel memory fragmentation when 76*4882a593Smuzhiyun * allocating the sop array. 77*4882a593Smuzhiyun */ 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun #define SEMMNI 32000 /* <= IPCMNI max # of semaphore identifiers */ 81*4882a593Smuzhiyun #define SEMMSL 32000 /* <= INT_MAX max num of semaphores per id */ 82*4882a593Smuzhiyun #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ 83*4882a593Smuzhiyun #define SEMOPM 500 /* <= 1 000 max num of ops per semop call */ 84*4882a593Smuzhiyun #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ 85*4882a593Smuzhiyun #define SEMAEM SEMVMX /* adjust on exit max value */ 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun /* unused */ 88*4882a593Smuzhiyun #define SEMUME SEMOPM /* max num of undo entries per process */ 89*4882a593Smuzhiyun #define SEMMNU SEMMNS /* num of undo structures system wide */ 90*4882a593Smuzhiyun #define SEMMAP SEMMNS /* # of entries in semaphore map */ 91*4882a593Smuzhiyun #define SEMUSZ 20 /* sizeof struct sem_undo */ 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun 94*4882a593Smuzhiyun #endif /* _UAPI_LINUX_SEM_H */ 95