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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
607ca46e DH |
2 | #ifndef _UAPI_LINUX_SEM_H |
3 | #define _UAPI_LINUX_SEM_H | |
4 | ||
5 | #include <linux/ipc.h> | |
6 | ||
7 | /* semop flags */ | |
8 | #define SEM_UNDO 0x1000 /* undo the operation on exit */ | |
9 | ||
10 | /* semctl Command Definitions. */ | |
11 | #define GETPID 11 /* get sempid */ | |
12 | #define GETVAL 12 /* get semval */ | |
13 | #define GETALL 13 /* get all semval's */ | |
14 | #define GETNCNT 14 /* get semncnt */ | |
15 | #define GETZCNT 15 /* get semzcnt */ | |
16 | #define SETVAL 16 /* set semval */ | |
17 | #define SETALL 17 /* set all semval's */ | |
18 | ||
19 | /* ipcs ctl cmds */ | |
20 | #define SEM_STAT 18 | |
21 | #define SEM_INFO 19 | |
a280d6dc | 22 | #define SEM_STAT_ANY 20 |
607ca46e DH |
23 | |
24 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ | |
25 | struct semid_ds { | |
26 | struct ipc_perm sem_perm; /* permissions .. see ipc.h */ | |
27 | __kernel_time_t sem_otime; /* last semop time */ | |
2cd648c1 | 28 | __kernel_time_t sem_ctime; /* create/last semctl() time */ |
607ca46e DH |
29 | struct sem *sem_base; /* ptr to first semaphore in array */ |
30 | struct sem_queue *sem_pending; /* pending operations to be processed */ | |
31 | struct sem_queue **sem_pending_last; /* last pending operation */ | |
32 | struct sem_undo *undo; /* undo requests on this array */ | |
33 | unsigned short sem_nsems; /* no. of semaphores in array */ | |
34 | }; | |
35 | ||
36 | /* Include the definition of semid64_ds */ | |
37 | #include <asm/sembuf.h> | |
38 | ||
39 | /* semop system calls takes an array of these. */ | |
40 | struct sembuf { | |
41 | unsigned short sem_num; /* semaphore index in array */ | |
42 | short sem_op; /* semaphore operation */ | |
43 | short sem_flg; /* operation flags */ | |
44 | }; | |
45 | ||
46 | /* arg for semctl system calls. */ | |
47 | union semun { | |
48 | int val; /* value for SETVAL */ | |
49 | struct semid_ds __user *buf; /* buffer for IPC_STAT & IPC_SET */ | |
50 | unsigned short __user *array; /* array for GETALL & SETALL */ | |
51 | struct seminfo __user *__buf; /* buffer for IPC_INFO */ | |
52 | void __user *__pad; | |
53 | }; | |
54 | ||
55 | struct seminfo { | |
56 | int semmap; | |
57 | int semmni; | |
58 | int semmns; | |
59 | int semmnu; | |
60 | int semmsl; | |
61 | int semopm; | |
62 | int semume; | |
63 | int semusz; | |
64 | int semvmx; | |
65 | int semaem; | |
66 | }; | |
67 | ||
e843e7d2 MS |
68 | /* |
69 | * SEMMNI, SEMMSL and SEMMNS are default values which can be | |
70 | * modified by sysctl. | |
71 | * The values has been chosen to be larger than necessary for any | |
72 | * known configuration. | |
73 | * | |
74 | * SEMOPM should not be increased beyond 1000, otherwise there is the | |
75 | * risk that semop()/semtimedop() fails due to kernel memory fragmentation when | |
76 | * allocating the sop array. | |
77 | */ | |
78 | ||
79 | ||
80 | #define SEMMNI 32000 /* <= IPCMNI max # of semaphore identifiers */ | |
81 | #define SEMMSL 32000 /* <= INT_MAX max num of semaphores per id */ | |
607ca46e | 82 | #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
e843e7d2 | 83 | #define SEMOPM 500 /* <= 1 000 max num of ops per semop call */ |
607ca46e DH |
84 | #define SEMVMX 32767 /* <= 32767 semaphore maximum value */ |
85 | #define SEMAEM SEMVMX /* adjust on exit max value */ | |
86 | ||
87 | /* unused */ | |
88 | #define SEMUME SEMOPM /* max num of undo entries per process */ | |
89 | #define SEMMNU SEMMNS /* num of undo structures system wide */ | |
90 | #define SEMMAP SEMMNS /* # of entries in semaphore map */ | |
91 | #define SEMUSZ 20 /* sizeof struct sem_undo */ | |
92 | ||
93 | ||
94 | #endif /* _UAPI_LINUX_SEM_H */ |