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607ca46e DH |
1 | #ifndef _UAPI_LINUX_SEM_H |
2 | #define _UAPI_LINUX_SEM_H | |
3 | ||
4 | #include <linux/ipc.h> | |
5 | ||
6 | /* semop flags */ | |
7 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ | |
8 | ||
9 | /* semctl Command Definitions. */ | |
10 | #define GETPID 11 /* get sempid */ | |
11 | #define GETVAL 12 /* get semval */ | |
12 | #define GETALL 13 /* get all semval's */ | |
13 | #define GETNCNT 14 /* get semncnt */ | |
14 | #define GETZCNT 15 /* get semzcnt */ | |
15 | #define SETVAL 16 /* set semval */ | |
16 | #define SETALL 17 /* set all semval's */ | |
17 | ||
18 | /* ipcs ctl cmds */ | |
19 | #define SEM_STAT 18 | |
20 | #define SEM_INFO 19 | |
21 | ||
22 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ | |
23 | struct semid_ds { | |
24 | struct ipc_perm sem_perm; /* permissions .. see ipc.h */ | |
25 | __kernel_time_t sem_otime; /* last semop time */ | |
26 | __kernel_time_t sem_ctime; /* last change time */ | |
27 | struct sem *sem_base; /* ptr to first semaphore in array */ | |
28 | struct sem_queue *sem_pending; /* pending operations to be processed */ | |
29 | struct sem_queue **sem_pending_last; /* last pending operation */ | |
30 | struct sem_undo *undo; /* undo requests on this array */ | |
31 | unsigned short sem_nsems; /* no. of semaphores in array */ | |
32 | }; | |
33 | ||
34 | /* Include the definition of semid64_ds */ | |
35 | #include <asm/sembuf.h> | |
36 | ||
37 | /* semop system calls takes an array of these. */ | |
38 | struct sembuf { | |
39 | unsigned short sem_num; /* semaphore index in array */ | |
40 | short sem_op; /* semaphore operation */ | |
41 | short sem_flg; /* operation flags */ | |
42 | }; | |
43 | ||
44 | /* arg for semctl system calls. */ | |
45 | union semun { | |
46 | int val; /* value for SETVAL */ | |
47 | struct semid_ds __user *buf; /* buffer for IPC_STAT & IPC_SET */ | |
48 | unsigned short __user *array; /* array for GETALL & SETALL */ | |
49 | struct seminfo __user *__buf; /* buffer for IPC_INFO */ | |
50 | void __user *__pad; | |
51 | }; | |
52 | ||
53 | struct seminfo { | |
54 | int semmap; | |
55 | int semmni; | |
56 | int semmns; | |
57 | int semmnu; | |
58 | int semmsl; | |
59 | int semopm; | |
60 | int semume; | |
61 | int semusz; | |
62 | int semvmx; | |
63 | int semaem; | |
64 | }; | |
65 | ||
e843e7d2 MS |
66 | /* |
67 | * SEMMNI, SEMMSL and SEMMNS are default values which can be | |
68 | * modified by sysctl. | |
69 | * The values has been chosen to be larger than necessary for any | |
70 | * known configuration. | |
71 | * | |
72 | * SEMOPM should not be increased beyond 1000, otherwise there is the | |
73 | * risk that semop()/semtimedop() fails due to kernel memory fragmentation when | |
74 | * allocating the sop array. | |
75 | */ | |
76 | ||
77 | ||
78 | #define SEMMNI 32000 /* <= IPCMNI max # of semaphore identifiers */ | |
79 | #define SEMMSL 32000 /* <= INT_MAX max num of semaphores per id */ | |
607ca46e | 80 | #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
e843e7d2 | 81 | #define SEMOPM 500 /* <= 1 000 max num of ops per semop call */ |
607ca46e DH |
82 | #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ |
83 | #define SEMAEM SEMVMX /* adjust on exit max value */ | |
84 | ||
85 | /* unused */ | |
86 | #define SEMUME SEMOPM /* max num of undo entries per process */ | |
87 | #define SEMMNU SEMMNS /* num of undo structures system wide */ | |
88 | #define SEMMAP SEMMNS /* # of entries in semaphore map */ | |
89 | #define SEMUSZ 20 /* sizeof struct sem_undo */ | |
90 | ||
91 | ||
92 | #endif /* _UAPI_LINUX_SEM_H */ |