1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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 |
22 | #define SEM_STAT_ANY 20 |
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_old_time_t sem_otime; /* last semop time */ |
28 | __kernel_old_time_t sem_ctime; /* create/last semctl() time */ |
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 | |
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 */ |
82 | #define SEMMNS (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */ |
83 | #define SEMOPM 500 /* <= 1 000 max num of ops per semop call */ |
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 */ |
95 | |